diff --git a/include/psa/crypto_driver.h b/include/psa/crypto_driver.h
new file mode 100644
index 0000000000..64c21b591b
--- /dev/null
+++ b/include/psa/crypto_driver.h
@@ -0,0 +1,1287 @@
+#ifndef __PSA_CRYPTO_DRIVER_H__
+#define __PSA_CRYPTO_DRIVER_H__
+
+#include <stddef.h>
+#include <stdint.h>
+
+typedef uint32_t psa_status_t;
+typedef uint32_t psa_algorithm_t;
+typedef uint32_t encrypt_or_decrypt_t;
+typedef uint32_t psa_key_slot_t;
+typedef uint32_t psa_key_type_t;
+
+/** \defgroup opaque_mac Opaque Message Authentication Code
+ * @{
+ */
+/** \brief A function that starts an MAC operation for a PSA Crypto Driver implementation using an opaque key
+ *
+ * \param p_context A structure that will contain the hardware-specific MAC context
+ * \param key_slot The slot of the key to be used for the operation
+ * \param algorithm The algorithm to be used to underly the MAC operation
+ *
+ * \retval PSA_SUCCESS
+ * Success.
+ */
+typedef psa_status_t (*pcd_mac_opaque_setup_t)( void *p_context,
+ psa_key_slot_t key_slot,
+ psa_algorithm_t algorithm );
+
+/** \brief A function that continues a previously started MAC operation using an opaque key
+ *
+ * \param p_context A hardware-specific structure for the previously-established MAC operation to be continued
+ * \param p_input A buffer containing the message to be appended to the MAC operation
+ * \param input_length The size in bytes of the input message buffer
+ */
+typedef psa_status_t (*pcd_mac_opaque_update_t)( void *p_context,
+ const unsigned char *p_input,
+ size_t input_length );
+
+/** \brief a function that completes a previously started MAC operation by returning the resulting MAC using an opaque key
+ *
+ * \param p_context A hardware-specific structure for the previously started MAC operation to be fiinished
+ * \param p_output A buffer where the generated MAC will be placed
+ * \param output_size The size in bytes of the buffer that has been allocated for the `output` buffer
+ * \param p_output_length After completion, the address will contain the number of bytes placed in the `p_output` buffer
+ *
+ * \retval PSA_SUCCESS
+ * Success.
+ */
+typedef psa_status_t (*pcd_mac_opaque_finish_t)( void *p_ctx,
+ unsigned char *p_output,
+ size_t output_size,
+ size_t *p_output_length );
+
+/** \brief A function that completes a previously started MAC operation by comparing the resulting MAC against a known value
+ * using an opaque key
+ *
+ * \param p_context A hardware-specific structure for the previously started MAC operation to be fiinished
+ * \param p_mac The MAC value against which the resulting MAC will be compared against
+ * \param mac_length The size in bytes of the value stored in `mac`
+ *
+ * \retval PSA_SUCCESS
+ * The operation completed successfully and the MACs matched each other
+ * \retval PSA_ERROR_INVALID_SIGNATURE
+ * The operation completed successfully, but the calculated MAC did not match the provided MAC
+ */
+typedef psa_status_t (*pcd_mac_opaque_finish_verify_t)( void *p_context,
+ const unsigned char *p_mac,
+ size_t mac_length );
+
+/** \brief A funciton that performs an MAC operation in one command and return the calculated MAC using an opaque key
+ *
+ * \param p_input A buffer containing the message to be MACed
+ * \param input_length The size in bytes of `input`
+ * \param key_slot The slot of the key to be used
+ * \param alg The algorithm to be used to underlie the MAC operation
+ * \param p_output A buffer where the generated MAC will be placed
+ * \param output_size The size in bytes of the `output` buffer
+ * \param p_output_length After completion, the address will contain the number of bytes placed in the `output` buffer
+ *
+ * \retval PSA_SUCCESS
+ * Success.
+ */
+typedef psa_status_t (*pcd_mac_opaque_t)( const unsigned char *p_input,
+ size_t input_length,
+ psa_key_slot_t key_slot,
+ psa_algorithm_t alg,
+ unsigned char *p_output,
+ size_t output_size,
+ size_t *p_output_length );
+
+/** \brief A function that performs an MAC operation in one command and compare the resulting MAC against a known value using an opaque key
+ *
+ * \param p_input A buffer containing the message to be MACed
+ * \param input_length The size in bytes of `input`
+ * \param key_slot The slot of the key to be used
+ * \param alg The algorithm to be used to underlie the MAC operation
+ * \param p_mac The MAC value against which the resulting MAC will be compared against
+ * \param mac_length The size in bytes of `mac`
+ *
+ * \retval PSA_SUCCESS
+ * The operation completed successfully and the MACs matched each other
+ * \retval PSA_ERROR_INVALID_SIGNATURE
+ * The operation completed successfully, but the calculated MAC did not match the provided MAC
+ */
+typedef psa_status_t (*pcd_mac_opaque_verify_t)( const unsigned char *p_input,
+ size_t input_length,
+ psa_key_slot_t key_slot,
+ psa_algorithm_t alg,
+ const unsigned char *p_mac,
+ size_t mac_length );
+
+/** \brief A struct containing all of the function pointers needed to implement MAC operations using opaque keys.
+ *
+ * PSA Crypto API implementations should populate the table as appropriate upon startup.
+ *
+ * If one of the functions is not implemented (such as `pcd_mac_opaque_t`), it should be set to NULL.
+ *
+ */
+struct pcd_mac_opaque_t {
+ size_t context_size; /**<The size in bytes of the hardware-specific Opaque-MAC Context structure */
+ pcd_mac_opaque_setup_t *p_setup; /**< Function that performs the setup operation */
+ pcd_mac_opaque_update_t *p_update; /**< Function that performs the update operation */
+ pcd_mac_opaque_finish_t *p_finish; /**< Function that completes the operation */
+ pcd_mac_opaque_t *p_mac; /**< Function that performs the MAC operation in one call */
+ pcd_mac_opaque_verify_t *p_mac_verify; /**<Function that performs the MAC and verify operation in one call */
+};
+/** @} */
+
+/** \defgroup transparent_mac Transparent Message Authentication Code
+ * @{
+ */
+
+/** \brief The hardware-specific transparent-key MAC context structure
+ * The contents of this structure are implementation dependent and are therefore not described here
+ */
+struct pcd_mac_transparent_context_t {
+ // Implementation specific
+};
+
+/** \brief The function prototype for the setup operation of a transparent-key MAC operation
+ *
+ * Functions that implement the prototype should be named in the following convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_mac_transparent_<ALGO>_<MAC_VARIANT>_start
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the underlying hash function, and `MAC_VARIANT` is the specific variant of a
+ * MAC operation (such as HMAC or CMAC)
+ *
+ * \param p_context A structure that will contain the hardware-specific MAC context
+ * \param p_key A buffer containing the cleartext key material to be used in the operation
+ * \param key_length The size in bytes of the key material
+ *
+ * \retval PSA_SUCCESS
+ * Success.
+ */
+typedef psa_status_t (*pcd_mac_transparent_start_t)( struct pcd_mac_transparent_context_t *p_context,
+ const unsigned char *p_key,
+ size_t key_length );
+
+/** \brief The function prototype for the update operation of a transparent-key MAC operation
+ *
+ * Functions that implement the prototype should be named in the following convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_mac_transparent_<ALGO>_<MAC_VARIANT>_update
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the underlying algorithm, and `MAC_VARIANT` is the specific variant of a
+ * MAC operation (such as HMAC or CMAC)
+ *
+ * \param p_context A hardware-specific structure for the previously-established MAC operation to be continued
+ * \param p_input A buffer containing the message to be appended to the MAC operation
+ * \param input_length The size in bytes of the input message buffer
+ */
+typedef psa_status_t (*pcd_mac_transparent_update_t)( struct pcd_mac_transparent_context_t *p_context,
+ const unsigned char *p_input,
+ size_t input_length );
+
+/** \brief The function prototype for the finish operation of a transparent-key MAC operation
+ *
+ * Functions that implement the prototype should be named in the following convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_mac_transparent_<ALGO>_<MAC_VARIANT>_finish
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the underlying algorithm, and `MAC_VARIANT` is the specific variant of a
+ * MAC operation (such as HMAC or CMAC)
+ *
+ * \param p_context A hardware-specific structure for the previously started MAC operation to be fiinished
+ * \param p_output A buffer where the generated MAC will be placed
+ * \param output_size The size in bytes of the buffer that has been allocated for the `p_output` buffer
+ * \param p_output_length After completion, will contain the number of bytes placed in the `p_output` buffer
+ *
+ * \retval PSA_SUCCESS
+ * Success.
+ */
+typedef psa_status_t (*pcd_mac_transparent_finish_t)( struct pcd_mac_transparent_context_t *p_context,
+ unsigned char *p_output,
+ size_t output_size,
+ size_t *p_output_length );
+
+/** @}
+ */
+
+/** \defgroup opaque_cipher Opaque Symmetric Ciphers
+ ** @{
+ */
+
+/** \brief A function pointer that provides the cipher setup function for opaque-key operations
+ *
+ * TBD: Since this is an opaque API (External, in Gilles nomeclature), shouldn't we be receiving a key handle/slot instead of key data? This is how I
+ * will write it
+
+ * \param p_context A structure that will contain the hardware-specific cipher context.
+ * \param key_slot THe slot of the key to be used for the operation
+ * \param algorithm The algorithm to be used in the cipher operation
+ * \param direction Indicates whether the operation is an encrypt or decrypt
+ *
+ * \retval PSA_SUCCESS
+ * \retval PSA_ERROR_NOT_SUPPORTED
+ */
+typedef psa_status_t (*pcd_cipher_opaque_setup_t) ( void *p_context,
+ psa_key_slot_t key_slot,
+ psa_algorithm_t algorithm,
+ encrypt_or_decrypt_t direction );
+
+
+/** \brief A function pointer that sets the initialization vector (if necessary) for an opaque cipher operation
+ *
+ * Note that the psa_cipher_* function set has two IV functions: one to set the IV, and one to generate it
+ * internally. the generate function is not necessary for the driver API as the PSA Crypto implementation
+ * can do the generation using it's RNG features
+ *
+ * \param p_context A structure that contains the previously set up hardware-specific cipher context
+ * \param p_iv A buffer containing the initialization vector
+ * \param iv_length The size (in bytes) of the `p_iv` buffer
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_cipher_opaque_set_iv_t)( void *p_context,
+ const uint8_t *p_iv,
+ size_t iv_length );
+
+/** \brief A function that continues a previously started opaque-key cipher operation
+ *
+ * \param p_context A hardware-specific structure for the previously started cipher operation
+ * \param p_input A buffer containing the data to be encrypted/decrypted
+ * \param input_size The size in bytes of the buffer pointed to by `p_input`
+ * \param p_output The caller-allocated buffer where the output will be placed
+ * \param output_size The allocated size in bytes of the `p_output` buffer
+ * \param p_output_length After completion, will contain the number of bytes placed in the `p_output` buffer
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_cipher_opaque_update_t) (void *p_context,
+ const uint8_t *p_input,
+ size_t input_size,
+ uint8_t *p_output,
+ size_t output_size,
+ size_t *p_output_length );
+
+/** \brief A function that completes a previously started opaque-key cipher operation
+ *
+ * \param p_context A hardware-specific structure for the previously started cipher operation
+ * \param p_output The caller-callocated buffer where the output will be placed
+ * \param output_size The allocated size in bytes of the `p_output` buffer
+ * \param p_output_length After completion, will contain the number of bytes placed in the `p_output` buffer
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_cipher_opaque_finish_t) (void *p_context, uint8_t *p_output, size_t output_size, size_t *p_output_length );
+
+/** \brief A function that performs the ECB block mode for opaque-key cipher operations
+ *
+ * Note: this function should only be used with implementations that do not provide a needed higher-level operation.
+ *
+ * \param key_slot The slot of the key to be used for the operation
+ * \param algorithm The algorithm to be used in the cipher operation
+ * \param direction Indicates whether the operation is an encrypt or decrypt
+ * \param p_input A buffer containing the data to be encrypted/decrypted
+ * \param input_size The size in bytes of the buffer pointed to by `p_input`
+ * \param p_output The caller-allocated byffer where the output will be placed
+ * \param output_size The allocated size in bytes of the `p_output` buffer
+ *
+ * \retval PSA_SUCCESS
+ * \retval PSA_ERROR_NOT_SUPPORTED
+ */
+typedef psa_status_t (*pcd_cipher_opaque_ecb_t) ( psa_key_slot_t key_slot,
+ psa_algorithm_t algorithm,
+ encrypt_or_decrypt_t direction,
+ const uint8_t *p_input,
+ size_t input_size,
+ uint8_t *p_output,
+ size_t output_size );
+
+/**
+ * \brief A struct containing all of the function pointers needed to implement cipher operations using opaque keys.
+ *
+ * PSA Crypto API implementations should populate instances of the table as appropriate upon startup.
+ *
+ * If one of the functions is not implemented (such as `pcd_cipher_opaque_ecb_t`), it should be set to NULL.
+ */
+struct pcd_cipher_opaque_t {
+ size_t size; /**<The size in bytes of the hardware-specific Opaque Cipher context structure */
+ pcd_cipher_opaque_setup_t *p_setup; /**< Function that performs the setup operation */
+ pcd_cipher_opaque_set_iv_t *p_set_iv; /**< Function that sets the IV (if necessary) */
+ pcd_cipher_opaque_update_t *p_update; /**< Function that performs the update operation */
+ pcd_cipher_opaque_finish_t *p_finish; /**< Function that completes the operation */
+ pcd_cipher_opaque_ecb_t *p_ecb; /**< Function that performs ECB mode for the cipher (Danger: ECB mode is insecure) */
+};
+
+/** @}
+ */
+
+/** \defgroup transparent_cipher Transparent Block Cipher
+ * @{
+ */
+
+/** \brief The hardware-specific transparent-key Cipher context structure
+ * The contents of this structure are implementation dependent and are therefore not described here
+ */
+struct pcd_cipher_transparent_context_t {
+ // Implementation specific
+};
+
+/** \brief The function prototype for the setup operation of transparent-key block cipher operations.
+ * Functions that implement the prototype should be named in the following convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_cipher_transparent_setup_<CIPHER_NAME>_<MODE>
+ * ~~~~~~~~~~~~~
+ * Where
+ * - `CIPHER_NAME` is the name of the underlying block cipher (i.e. AES or DES)
+ * - `MODE` is the block mode of the cipher operation (i.e. CBC or CTR)
+ *
+ * \param p_context A structure that will contain the hardware-specific cipher context
+ * \param direction Indicates if the operation is an encrypt or a decrypt
+ * \param p_key_data A buffer containing the cleartext key material to be used in the operation
+ * \param key_data_size The size in bytes of the key material
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_cipher_transparent_setup_t) ( struct pcd_cipher_transparent_context_t *p_context,
+ encrypt_or_decrypt_t direction,
+ const uint8_t *p_key_data,
+ size_t key_data_size );
+
+/** \brief The function prototype for the set initialization vector operation of transparent-key block cipher operations
+ * Functions that implement the prototype should be named in the following convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_cipher_transparent_set_iv_<CIPHER_NAME>_<MODE>
+ * ~~~~~~~~~~~~~
+ * Where
+ * - `CIPHER_NAME` is the name of the underlying block cipher (i.e. AES or DES)
+ * - `MODE` is the block mode of the cipher operation (i.e. CBC or CTR)
+ *
+ * \param p_context A structure that contains the previously setup hardware-specific cipher context
+ * \param p_iv A buffer containing the initialization vecotr
+ * \param iv_length The size in bytes of the contents of `p_iv`
+ *
+ * \retval PSA_SUCCESS
+*/
+typedef psa_status_t (*pcd_cipher_transparent_set_iv_t) ( struct pcd_cipher_transparent_context_t *p_context,
+ const uint8_t *p_iv,
+ size_t iv_length );
+/** \brief The function prototype for the update operation of transparent-key block cipher operations.
+ *
+ * Functions that implement the prototype should be named in the following convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_cipher_transparent_update_<CIPHER_NAME>_<MODE>
+ * ~~~~~~~~~~~~~
+ * Where
+ * - `CIPHER_NAME` is the name of the underlying block cipher (i.e. AES or DES)
+ * - `MODE` is the block mode of the cipher operation (i.e. CBC or CTR)
+ *
+ * TODO: Should the PSA Crypto API implementation calling these functions handle padding? What about hardware that handles padding?
+ *
+ * \param p_context A hardware-specific structure for the previously started cipher operation
+ * \param p_input A buffer containing the data to be encrypted or decrypted
+ * \param input_size The size in bytes of the `p_input` buffer
+ * \param p_output A caller-allocated buffer where the generated output will be placed
+ * \param output_size The size in bytes of the `p_output` buffer
+ * \param p_output_length After completion, will contain the number of bytes placed in the `p_output` buffer
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_cipher_transparent_update_t) ( struct pcd_cipher_transparent_context_t *p_context,
+ const uint8_t *p_input,
+ size_t input_size,
+ uint8_t *p_output,
+ size_t output_size,
+ size_t *p_output_length );
+
+/** \brief The function prototype for the finish operation of transparent-key block cipher operations.
+*
+ * Functions that implement the prototype should be named in the following convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_cipher_transparent_finish_<CIPHER_NAME>_<MODE>
+ * ~~~~~~~~~~~~~
+ * Where
+ * - `CIPHER_NAME` is the name of the underlying block cipher (i.e. AES or DES)
+ * - `MODE` is the block mode of the cipher operation (i.e. CBC or CTR)
+ *
+ * TODO: Should the PSA Crypto API implementation calling these functions handle padding? What about hardware that handles padding?
+ *
+ * \param p_context A hardware-specific structure for the previously started cipher operation
+ * \param p_output A caller-allocated buffer where the generated output will be placed
+ * \param output_size The size in bytes of the `p_output` buffer
+ * \param p_output_length After completion, will contain the number of bytes placed in the `p_output` buffer
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_cipher_transparent_finish_t) ( struct pcd_cipher_transparent_context_t *p_context,
+ uint8_t *p_output,
+ size_t output_size,
+ size_t *p_output_length );
+
+/** \brief The function prototype for the abort operation of transparent-key block cipher operations.
+ *
+ * Functions that implement the following prototype should be named in the following convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_cipher_transparent_abort_<CIPHER_NAME>_<MODE>
+ * ~~~~~~~~~~~~~
+ * Where
+ * - `CIPHER_NAME` is the name of the underlying block cipher (i.e. AES or DES)
+ * - `MODE` is the block mode of the cipher operation (i.e. CBC or CTR)
+ *
+ * TODO: Should the PSA Crypto API implementation calling these functions handle padding? What about hardware that handles padding?
+ *
+ * \param p_context A hardware-specific structure for the previously started cipher operation
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_cipher_transparent_abort_t) ( struct pcd_cipher_transparent_context_t *p_context );
+
+/** @}
+ */
+
+/** \defgroup digest Message Digests
+ * @{
+ */
+
+/** \brief The hardware-specific hash context structure
+ * The contents of this structure are implementation dependent and are therefore not described here
+ */
+struct pcd_hash_context_t {
+ // Implementation specific
+};
+
+/** \brief The function prototype for the start operation of a hash (message digest) operation
+ *
+ * Functions that implement the prototype should be named in the following convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_hash_<ALGO>_start
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the underlying hash function
+ *
+ * \param p_context A structure that will contain the hardware-specific hash context
+ *
+ * \retval PSA_SUCCESS Success.
+ */
+typedef psa_status_t (*pcd_hash_start_t)(struct pcd_hash_context_t *p_context );
+
+
+
+/** \brief The function prototype for the update operation of a hash (message digest) operation
+ *
+ * Functions that implement the prototype should be named in the following convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_hash_<ALGO>_update
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the underlying algorithm
+ *
+ * \param p_context A hardware-specific structure for the previously-established hash operation to be continued
+ * \param p_input A buffer containing the message to be appended to the hash operation
+ * \param input_length The size in bytes of the input message buffer
+ */
+typedef psa_status_t (*pcd_hash_update_t)(struct pcd_hash_context_t *p_context, const unsigned char *p_input, size_t input_length);
+
+/** \brief The prototype for the finish operation of a hash (message digest) operation
+ *
+ * Functions that implement the prototype should be named in the following convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_hash_<ALGO>_finish
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the underlying algorithm
+ *
+ * \param p_context A hardware-specific structure for the previously started hash operation to be fiinished
+ * \param p_output A buffer where the generated digest will be placed
+ * \param output_size The size in bytes of the buffer that has been allocated for the `p_output` buffer
+ *
+ * \retval PSA_SUCCESS
+ * Success.
+ */
+typedef psa_status_t (*pcd_hash_finish_t)(struct pcd_hash_context_t *p_context, unsigned char *p_output, size_t output_size);
+
+/** \brief The function prototype for the abort operation of a hash (message digest) operation
+ *
+ * Functions that implement the prototype should be named in the following convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_hash_<ALGO>_abort
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the underlying algorithm
+ *
+ * \param p_context A hardware-specific structure for the previously started hash operation to be aborted
+ */
+typedef void (*pcd_hash_abort_t)(struct pcd_hash_context_t *p_context);
+
+/** @}
+ */
+
+
+/** \defgroup opaque_asymmetric Opaque Asymmetric Cryptography
+ * @{
+ */
+
+/**
+ * \brief A function that signs a hash or short message with a private key.
+ *
+ * \param key_slot Key slot of an asymmetric key pair.
+ * \param alg A signature algorithm that is compatible with
+ * the type of `key`.
+ * \param[in] p_hash The hash or message to sign.
+ * \param hash_length Size of the `p_hash` buffer in bytes.
+ * \param[out] p_signature Buffer where the signature is to be written.
+ * \param signature_size Size of the `p_signature` buffer in bytes.
+ * \param[out] p_signature_length On success, the number of bytes
+ * that make up the returned signature value.
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_asymmetric_opaque_sign_t)( psa_key_slot_t key_slot,
+ psa_algorithm_t alg,
+ const uint8_t *p_hash,
+ size_t hash_length,
+ uint8_t *p_signature,
+ size_t signature_size,
+ size_t *p_signature_length );
+
+/**
+ * \brief A function that verifies the signature a hash or short message using a public key.
+ *
+ * \param key_slot Key slot of a public key or an asymmetric key pair.
+ * \param alg A signature algorithm that is compatible with
+ * the type of `key`.
+ * \param[in] p_hash The hash or message whose signature is to be
+ * verified.
+ * \param hash_length Size of the `p_hash` buffer in bytes.
+ * \param[in] p_signature Buffer containing the signature to verify.
+ * \param signature_length Size of the `p_signature` buffer in bytes.
+ *
+ * \retval PSA_SUCCESS
+ * The signature is valid.
+ */
+typedef psa_status_t (*pcd_asymmetric_opaque_verify_t)( psa_key_slot_t key_slot,
+ psa_algorithm_t alg,
+ const uint8_t *p_hash,
+ size_t hash_length,
+ const uint8_t *p_signature,
+ size_t signature_length );
+
+/**
+ * \brief A function that encrypts a short message with a public key.
+ *
+ * \param key_slot Key slot of a public key or an asymmetric key pair.
+ * \param alg An asymmetric encryption algorithm that is
+ * compatible with the type of `key`.
+ * \param[in] p_input The message to encrypt.
+ * \param input_length Size of the `p_input` buffer in bytes.
+ * \param[in] p_salt A salt or label, if supported by the
+ * encryption algorithm.
+ * If the algorithm does not support a
+ * salt, pass `NULL`.
+ * If the algorithm supports an optional
+ * salt and you do not want to pass a salt,
+ * pass `NULL`.
+ *
+ * - For #PSA_ALG_RSA_PKCS1V15_CRYPT, no salt is
+ * supported.
+ * \param salt_length Size of the `p_salt` buffer in bytes.
+ * If `p_salt` is `NULL`, pass 0.
+ * \param[out] p_output Buffer where the encrypted message is to
+ * be written.
+ * \param output_size Size of the `p_output` buffer in bytes.
+ * \param[out] p_output_length On success, the number of bytes
+ * that make up the returned output.
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_asymmetric_opaque_encrypt_t)( psa_key_slot_t key_slot,
+ psa_algorithm_t alg,
+ const uint8_t *p_input,
+ size_t input_length,
+ const uint8_t *p_salt,
+ size_t salt_length,
+ uint8_t *p_output,
+ size_t output_size,
+ size_t *p_output_length );
+
+/**
+ * \brief Decrypt a short message with a private key.
+ *
+ * \param key_slot Key slot of an asymmetric key pair.
+ * \param alg An asymmetric encryption algorithm that is
+ * compatible with the type of \p key.
+ * \param[in] p_input The message to decrypt.
+ * \param input_length Size of the `p_input` buffer in bytes.
+ * \param[in] p_salt A salt or label, if supported by the
+ * encryption algorithm.
+ * If the algorithm does not support a
+ * salt, pass `NULL`.
+ * If the algorithm supports an optional
+ * salt and you do not want to pass a salt,
+ * pass `NULL`.
+ *
+ * - For #PSA_ALG_RSA_PKCS1V15_CRYPT, no salt is
+ * supported.
+ * \param salt_length Size of the `p_salt` buffer in bytes.
+ * If `p_salt` is `NULL`, pass 0.
+ * \param[out] p_output Buffer where the decrypted message is to
+ * be written.
+ * \param output_size Size of the `p_output` buffer in bytes.
+ * \param[out] p_output_length On success, the number of bytes
+ * that make up the returned output.
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_asymmetric_opaque_decrypt_t)( psa_key_slot_t key_slot,
+ psa_algorithm_t alg,
+ const uint8_t *p_input,
+ size_t input_length,
+ const uint8_t *p_salt,
+ size_t salt_length,
+ uint8_t *p_output,
+ size_t output_size,
+ size_t *p_output_length );
+
+/**
+ * \brief A struct containing all of the function pointers needed to implement asymmetric cryptographic operations
+ * using opaque keys.
+ *
+ * PSA Crypto API implementations should populate instances of the table as appropriate upon startup.
+ *
+ * If one of the functions is not implemented, it should be set to NULL.
+ */
+struct pcd_asymmetric_opaque_t {
+ pcd_asymmetric_opaque_sign_t *p_sign; /**< Function that performs the asymmetric sign operation */
+ pcd_asymmetric_opaque_verify_t *p_verify; /**< Function that performs the asymmetric verify operation */
+ pcd_asymmetric_opaque_encrypt_t *p_encrypt; /**< Function that performs the asymmetric encrypt operation */
+ pcd_asymmetric_opaque_decrypt_t *p_decrypt; /**< Function that performs the asymmetric decrypt operation */
+};
+
+/** @}
+ */
+
+/** \defgroup transparent_asymmetric Transparent Asymmetric Cryptography
+ * @{
+ */
+
+
+/**
+ * \brief A function that signs a hash or short message with a transparent private key.
+ *
+ * Functions that implement the prototype should be named in the following convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_asymmetric_<ALGO>_sign
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the signing algorithm
+ *
+ * \param p_key A buffer containing the private key material.
+ * \param key_size The size in bytes of the `p_key` data
+ * \param alg A signature algorithm that is compatible with
+ * the type of `p_key`.
+ * \param[in] p_hash The hash or message to sign.
+ * \param hash_length Size of the `p_hash` buffer in bytes.
+ * \param[out] p_signature Buffer where the signature is to be written.
+ * \param signature_size Size of the `p_signature` buffer in bytes.
+ * \param[out] p_signature_length On success, the number of bytes
+ * that make up the returned signature value.
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_asymmetric_transparent_sign_t)( const uint8_t *p_key,
+ size_t key_size,
+ psa_algorithm_t alg,
+ const uint8_t *p_hash,
+ size_t hash_length,
+ uint8_t *p_signature,
+ size_t signature_size,
+ size_t *p_signature_length );
+
+/**
+ * \brief A function that verifies the signature a hash or short message using a transparent public key.
+ *
+ * Functions that implement the prototype should be named in the following convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_asymmetric_<ALGO>_verify
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the signing algorithm
+ *
+ * \param p_key A buffer containing the public key material.
+ * \param key_size The size in bytes of the `p_key` data
+ * \param alg A signature algorithm that is compatible with
+ * the type of `key`.
+ * \param[in] p_hash The hash or message whose signature is to be
+ * verified.
+ * \param hash_length Size of the `p_hash` buffer in bytes.
+ * \param[in] p_signature Buffer containing the signature to verify.
+ * \param signature_length Size of the `p_signature` buffer in bytes.
+ *
+ * \retval PSA_SUCCESS
+ * The signature is valid.
+ */
+typedef psa_status_t (*pcd_asymmetric_transparent_verify_t)( const uint8_t *p_key,
+ size_t key_size,
+ psa_algorithm_t alg,
+ const uint8_t *p_hash,
+ size_t hash_length,
+ const uint8_t *p_signature,
+ size_t signature_length );
+
+/**
+ * \brief A function that encrypts a short message with a transparent public key.
+ *
+ * Functions that implement the prototype should be named in the following convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_asymmetric_<ALGO>_encrypt
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the encryption algorithm
+ *
+ * \param p_key A buffer containing the public key material
+ * \param key_size The size in bytes of the `p_key` data
+ * \param alg An asymmetric encryption algorithm that is
+ * compatible with the type of `key`.
+ * \param[in] p_input The message to encrypt.
+ * \param input_length Size of the `p_input` buffer in bytes.
+ * \param[in] p_salt A salt or label, if supported by the
+ * encryption algorithm.
+ * If the algorithm does not support a
+ * salt, pass `NULL`.
+ * If the algorithm supports an optional
+ * salt and you do not want to pass a salt,
+ * pass `NULL`.
+ *
+ * - For #PSA_ALG_RSA_PKCS1V15_CRYPT, no salt is
+ * supported.
+ * \param salt_length Size of the `p_salt` buffer in bytes.
+ * If `p_salt` is `NULL`, pass 0.
+ * \param[out] p_output Buffer where the encrypted message is to
+ * be written.
+ * \param output_size Size of the `p_output` buffer in bytes.
+ * \param[out] p_output_length On success, the number of bytes
+ * that make up the returned output.
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_asymmetric_transparent_encrypt_t)( const uint8_t *p_key,
+ size_t key_size,
+ psa_algorithm_t alg,
+ const uint8_t *p_input,
+ size_t input_length,
+ const uint8_t *p_salt,
+ size_t salt_length,
+ uint8_t *p_output,
+ size_t output_size,
+ size_t *p_output_length );
+
+/**
+ * \brief Decrypt a short message with a transparent private key.
+ *
+ * Functions that implement the prototype should be named in the following convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_asymmetric_<ALGO>_decrypt
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the encryption algorithm
+ *
+ * \param p_key A buffer containing the private key material
+ * \param key_size The size in bytes of the `p_key` data
+ * \param alg An asymmetric encryption algorithm that is
+ * compatible with the type of \p key.
+ * \param[in] p_input The message to decrypt.
+ * \param input_length Size of the `p_input` buffer in bytes.
+ * \param[in] p_salt A salt or label, if supported by the
+ * encryption algorithm.
+ * If the algorithm does not support a
+ * salt, pass `NULL`.
+ * If the algorithm supports an optional
+ * salt and you do not want to pass a salt,
+ * pass `NULL`.
+ *
+ * - For #PSA_ALG_RSA_PKCS1V15_CRYPT, no salt is
+ * supported.
+ * \param salt_length Size of the `p_salt` buffer in bytes.
+ * If `p_salt` is `NULL`, pass 0.
+ * \param[out] p_output Buffer where the decrypted message is to
+ * be written.
+ * \param output_size Size of the `p_output` buffer in bytes.
+ * \param[out] p_output_length On success, the number of bytes
+ * that make up the returned output.
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_asymmetric_transparent_decrypt_t)( const uint8_t *p_key,
+ size_t key_size,
+ psa_algorithm_t alg,
+ const uint8_t *p_input,
+ size_t input_length,
+ const uint8_t *p_salt,
+ size_t salt_length,
+ uint8_t *p_output,
+ size_t output_size,
+ size_t *p_output_length );
+
+/** @}
+ */
+
+/** \defgroup aead_opaque AEAD Opaque
+ * * @{
+ */
+
+/** Process an authenticated encryption operation using an opaque key.
+ *
+ * \param key_slot Slot containing the key to use.
+ * \param algorithm The AEAD algorithm to compute
+ * (\c PSA_ALG_XXX value such that
+ * #PSA_ALG_IS_AEAD(\p alg) is true).
+ * \param[in] p_nonce Nonce or IV to use.
+ * \param nonce_length Size of the `p_nonce` buffer in bytes.
+ * \param[in] p_additional_data Additional data that will be authenticated
+ * but not encrypted.
+ * \param additional_data_length Size of `p_additional_data` in bytes.
+ * \param[in] p_plaintext Data that will be authenticated and
+ * encrypted.
+ * \param plaintext_length Size of `p_plaintext` in bytes.
+ * \param[out] p_ciphertext Output buffer for the authenticated and
+ * encrypted data. The additional data is not
+ * part of this output. For algorithms where the
+ * encrypted data and the authentication tag
+ * are defined as separate outputs, the
+ * authentication tag is appended to the
+ * encrypted data.
+ * \param ciphertext_size Size of the `p_ciphertext` buffer in bytes.
+ * \param[out] p_ciphertext_length On success, the size of the output
+ * in the `p_ciphertext` buffer.
+ *
+ * \retval #PSA_SUCCESS
+ * Success.
+ */
+typedef psa_status_t (*psa_aead_opaque_encrypt_t)( psa_key_slot_t key_slot,
+ psa_algorithm_t algorithm,
+ const uint8_t *p_nonce,
+ size_t nonce_length,
+ const uint8_t *p_additional_data,
+ size_t additional_data_length,
+ const uint8_t *p_plaintext,
+ size_t plaintext_length,
+ uint8_t *p_ciphertext,
+ size_t ciphertext_size,
+ size_t *p_ciphertext_length);
+
+/** Process an authenticated decryption operation using an opaque key.
+ *
+ * \param key_slot Slot containing the key to use.
+ * \param algorithm The AEAD algorithm to compute
+ * (\c PSA_ALG_XXX value such that
+ * #PSA_ALG_IS_AEAD(\p alg) is true).
+ * \param[in] p_nonce Nonce or IV to use.
+ * \param nonce_length Size of the `p_nonce` buffer in bytes.
+ * \param[in] p_additional_data Additional data that has been authenticated
+ * but not encrypted.
+ * \param additional_data_length Size of `p_additional_data` in bytes.
+ * \param[in] p_ciphertext Data that has been authenticated and
+ * encrypted. For algorithms where the
+ * encrypted data and the authentication tag
+ * are defined as separate inputs, the buffer
+ * must contain the encrypted data followed
+ * by the authentication tag.
+ * \param ciphertext_length Size of `p_ciphertext` in bytes.
+ * \param[out] p_plaintext Output buffer for the decrypted data.
+ * \param plaintext_size Size of the `p_plaintext` buffer in bytes.
+ * \param[out] p_plaintext_length On success, the size of the output
+ * in the `p_plaintext` buffer.
+ *
+ * \retval #PSA_SUCCESS
+ * Success.
+ */
+typedef psa_status_t (*psa_aead_opaque_decrypt_t)( psa_key_slot_t key_slot,
+ psa_algorithm_t algorithm,
+ const uint8_t *p_nonce,
+ size_t nonce_length,
+ const uint8_t *p_additional_data,
+ size_t additional_data_length,
+ const uint8_t *p_ciphertext,
+ size_t ciphertext_length,
+ uint8_t *p_plaintext,
+ size_t plaintext_size,
+ size_t *p_plaintext_length);
+
+/**
+ * \brief A struct containing all of the function pointers needed to implement Authenticated Encryption
+ * with Additional Data operations using opaque keys
+ *
+ * PSA Crypto API implementations should populate instances of the table as appropriate upon startup.
+ *
+ * If one of the functions is not implemented, it should be set to NULL.
+ */
+struct psa_aead_opaque_t {
+ psa_aead_opaque_encrypt_t *p_encrypt; /**< Function that performs the AEAD encrypt operation */
+ psa_aead_opaque_decrypt_t *p_decrypt; /**< Function that performs the AEAD decrypt operation */
+};
+/** @}
+ */
+
+/** \defgroup aead_transparent AEAD Transparent
+ */
+
+/** Process an authenticated encryption operation.
+ *
+ * Functions that implement the prototype should be named in the following convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_aead_<ALGO>_encrypt
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the AEAD algorithm
+ *
+ * \param p_key A pointer to the key material
+ * \param key_length The size in bytes of the key material
+ * \param alg The AEAD algorithm to compute
+ * (\c PSA_ALG_XXX value such that
+ * #PSA_ALG_IS_AEAD(\p alg) is true).
+ * \param[in] nonce Nonce or IV to use.
+ * \param nonce_length Size of the \p nonce buffer in bytes.
+ * \param[in] additional_data Additional data that will be MACed
+ * but not encrypted.
+ * \param additional_data_length Size of \p additional_data in bytes.
+ * \param[in] plaintext Data that will be MACed and
+ * encrypted.
+ * \param plaintext_length Size of \p plaintext in bytes.
+ * \param[out] ciphertext Output buffer for the authenticated and
+ * encrypted data. The additional data is not
+ * part of this output. For algorithms where the
+ * encrypted data and the authentication tag
+ * are defined as separate outputs, the
+ * authentication tag is appended to the
+ * encrypted data.
+ * \param ciphertext_size Size of the \p ciphertext buffer in bytes.
+ * This must be at least
+ * #PSA_AEAD_ENCRYPT_OUTPUT_SIZE(\p alg,
+ * \p plaintext_length).
+ * \param[out] ciphertext_length On success, the size of the output
+ * in the \b ciphertext buffer.
+ *
+ * \retval #PSA_SUCCESS
+
+ */
+typedef psa_status_t (*psa_aead_transparent_encrypt_t)( const uint8_t *p_key,
+ size_t key_length,
+ psa_algorithm_t alg,
+ const uint8_t *nonce,
+ size_t nonce_length,
+ const uint8_t *additional_data,
+ size_t additional_data_length,
+ const uint8_t *plaintext,
+ size_t plaintext_length,
+ uint8_t *ciphertext,
+ size_t ciphertext_size,
+ size_t *ciphertext_length );
+
+/** Process an authenticated decryption operation.
+ *
+ * Functions that implement the prototype should be named in the following convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_aead_<ALGO>_decrypt
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the AEAD algorithm
+ * \param p_key A pointer to the key material
+ * \param key_length The size in bytes of the key material
+ * \param alg The AEAD algorithm to compute
+ * (\c PSA_ALG_XXX value such that
+ * #PSA_ALG_IS_AEAD(\p alg) is true).
+ * \param[in] nonce Nonce or IV to use.
+ * \param nonce_length Size of the \p nonce buffer in bytes.
+ * \param[in] additional_data Additional data that has been MACed
+ * but not encrypted.
+ * \param additional_data_length Size of \p additional_data in bytes.
+ * \param[in] ciphertext Data that has been MACed and
+ * encrypted. For algorithms where the
+ * encrypted data and the authentication tag
+ * are defined as separate inputs, the buffer
+ * must contain the encrypted data followed
+ * by the authentication tag.
+ * \param ciphertext_length Size of \p ciphertext in bytes.
+ * \param[out] plaintext Output buffer for the decrypted data.
+ * \param plaintext_size Size of the \p plaintext buffer in bytes.
+ * This must be at least
+ * #PSA_AEAD_DECRYPT_OUTPUT_SIZE(\p alg,
+ * \p ciphertext_length).
+ * \param[out] plaintext_length On success, the size of the output
+ * in the \b plaintext buffer.
+ *
+ * \retval #PSA_SUCCESS
+ * Success.
+ */
+typedef psa_status_t (*psa_aead_transparent_decrypt_t) ( const uint8_t *p_key,
+ size_t key_length,
+ psa_algorithm_t alg,
+ const uint8_t *nonce,
+ size_t nonce_length,
+ const uint8_t *additional_data,
+ size_t additional_data_length,
+ const uint8_t *ciphertext,
+ size_t ciphertext_length,
+ uint8_t *plaintext,
+ size_t plaintext_size,
+ size_t *plaintext_length);
+
+/** @}
+
+
+/** \defgroup rng Entropy Generation
+ * @{
+ */
+
+/** \brief A hardware-specific structure for a entropy providing hardware
+ */
+struct pcd_entropy_context_t {
+ // Implementation specific
+};
+
+/** \brief Initialize an entropy driver
+ *
+ *
+ * \param p_context A hardware-specific structure containing any context information for the implementation
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_entropy_init_t)( struct pcd_entropy_context_t *p_context );
+
+/** \brief Get a specified number of bytes from the entropy source
+ *
+ * Retrives `buffer_size` bytes of data from the entropy source. The entropy source will always fill the provided buffer to its full size.
+ * However, most entropy sources have biases, and the actual amount of entropy contained in the buffer will be less than the number of bytes.
+ * The driver will return the actual number of bytes of entropy placed in the buffer in `p_received_entropy_bytes`.
+ * A PSA Crypto API implementation will likely feed the output of this function into a Digital Random Bit Generator (DRBG), and typically has
+ * a minimum amount of entropy that it needs.
+ * To accomplish this, the PSA Crypto implementation should be designed to call this function multiple times until it has received the required
+ * amount of entropy from the entropy source.
+ *
+ * \param p_context A hardware-specific structure containing any context information for the implementation
+ * \param p_buffer A caller-allocated buffer for the retrieved bytes to be placed in
+ * \param buffer_size The allocated size of `p_buffer`
+ * \param p_received_entropy_bytes The amount of entropy (in bytes) actually provided in `p_buffer`
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_entropy_get_bytes_t)( struct pcd_entropy_context_t *p_context, uint8_t *p_buffer, uint32_t buffer_size, uint32_t *p_received_entropy_bytes );
+
+/**
+ * \brief A struct containing all of the function pointers needed to interface to an entropy source
+ *
+ * PSA Crypto API implementations should populate instances of the table as appropriate upon startup.
+ *
+ * If one of the functions is not implemented, it should be set to NULL.
+ */
+struct pcd_entropy_t {
+ pcd_entropy_init_t *p_init; /**< Function that performs initialization for the entropy source */
+ pcd_entropy_get_bytes_t *p_get_bytes; /**< Function that performs the get_bytes operation for the entropy source */
+};
+/** @}
+ */
+
+/** \defgroup key_management Key Management
+ * @{
+ */
+
+/** \brief Import a key in binary format.
+ *
+ * This function can support any output from psa_export_key(). Refer to the
+ * documentation of psa_export_key() for the format for each key type.
+ *
+ * \param key_slot Slot where the key will be stored. This must be a
+ * valid slot for a key of the chosen type. It must
+ * be unoccupied.
+ * \param type Key type (a \c PSA_KEY_TYPE_XXX value).
+ * \param[in] p_data Buffer containing the key data.
+ * \param data_length Size of the \p data buffer in bytes.
+ *
+ * \retval #PSA_SUCCESS
+ * Success.
+ */
+typedef psa_status_t (*pcd_opaque_import_key_t) ( psa_key_slot_t key_slot,
+ psa_key_type_t type,
+ const uint8_t *p_data,
+ size_t data_length );
+
+/**
+ * \brief Destroy a key and restore the slot to its default state.
+ *
+ * This function destroys the content of the key slot from both volatile
+ * memory and, if applicable, non-volatile storage. Implementations shall
+ * make a best effort to ensure that any previous content of the slot is
+ * unrecoverable.
+ *
+ * This function also erases any metadata such as policies. It returns the
+ * specified slot to its default state.
+ *
+ * \param key_slot The key slot to erase.
+ *
+ * \retval #PSA_SUCCESS
+ * The slot's content, if any, has been erased.
+ */
+typedef psa_status_t (*pcd_destroy_key_t)( psa_key_slot_t key );
+
+/**
+ * \brief Export a key in binary format.
+ *
+ * The output of this function can be passed to psa_import_key() to
+ * create an equivalent object.
+ *
+ * If a key is created with psa_import_key() and then exported with
+ * this function, it is not guaranteed that the resulting data is
+ * identical: the implementation may choose a different representation
+ * of the same key if the format permits it.
+ *
+ * For standard key types, the output format is as follows:
+ *
+ * - For symmetric keys (including MAC keys), the format is the
+ * raw bytes of the key.
+ * - For DES, the key data consists of 8 bytes. The parity bits must be
+ * correct.
+ * - For Triple-DES, the format is the concatenation of the
+ * two or three DES keys.
+ * - For RSA key pairs (#PSA_KEY_TYPE_RSA_KEYPAIR), the format
+ * is the non-encrypted DER representation defined by PKCS\#1 (RFC 8017)
+ * as RSAPrivateKey.
+ * - For RSA public keys (#PSA_KEY_TYPE_RSA_PUBLIC_KEY), the format
+ * is the DER representation defined by RFC 5280 as SubjectPublicKeyInfo.
+ *
+ * \param key Slot whose content is to be exported. This must
+ * be an occupied key slot.
+ * \param[out] p_data Buffer where the key data is to be written.
+ * \param data_size Size of the `p_data` buffer in bytes.
+ * \param[out] p_data_length On success, the number of bytes
+ * that make up the key data.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_EMPTY_SLOT
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_TAMPERING_DETECTED
+ */
+typedef psa_status_t (*pcd_export_key_t)( psa_key_slot_t key,
+ uint8_t *p_data,
+ size_t data_size,
+ size_t *p_data_length );
+
+/**
+ * \brief Export a public key or the public part of a key pair in binary format.
+ *
+ * The output of this function can be passed to psa_import_key() to
+ * create an object that is equivalent to the public key.
+ *
+ * For standard key types, the output format is as follows:
+ *
+ * - For RSA keys (#PSA_KEY_TYPE_RSA_KEYPAIR or #PSA_KEY_TYPE_RSA_PUBLIC_KEY),
+ * the format is the DER representation of the public key defined by RFC 5280
+ * as SubjectPublicKeyInfo.
+ *
+ * \param key_slot Slot whose content is to be exported. This must
+ * be an occupied key slot.
+ * \param[out] p_data Buffer where the key data is to be written.
+ * \param data_size Size of the \p data buffer in bytes.
+ * \param[out] p_data_length On success, the number of bytes
+ * that make up the key data.
+ *
+ * \retval #PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_export_public_key_t)( psa_key_slot_t key,
+ uint8_t *p_data,
+ size_t data_size,
+ size_t *p_data_length );
+
+/**
+ * \brief A struct containing all of the function pointers needed to for key management using
+ * opaque keys.
+ *
+ * PSA Crypto API implementations should populate instances of the table as appropriate upon startup.
+ *
+ * If one of the functions is not implemented, it should be set to NULL.
+ */
+struct pcd_key_management_t {
+ pcd_opaque_import_key_t *p_import; /**< Function that performs the key import operation */
+ pcd_destroy_key_t *p_destroy; /**< Function that performs the key destroy operation */
+ pcd_export_key_t *p_export; /**< Function that performs the key export operation */
+ pcd_export_public_key_t *p_export_public; /**< Function that perforsm the public key export operation */
+};
+
+/** @}
+ */
+
+/** \defgroup derivation Key Derivation and Agreement
+ * @{
+ * Key derivation is the process of generating new key material using an existing key and additional parameters, iterating through a basic
+ * cryptographic function, such as a hash.
+ * Key agreement is a part of cryptographic protocols that allows two parties to agree on the same key value, but starting from different original
+ * key material.
+ * The flows are similar, and the PSA Crypto Driver API uses the same functions for both of the flows.
+ *
+ * There are two different final functions for the flows, `pcd_key_derivation_derive` and `pcd_key_derivation_export`. `pcd_key_derivation_derive`
+ * is used when the key material should be placed in a slot on the hardware and not exposed to the caller. `pcd_key_derivation_export` is used
+ * when the key material should be returned to the PSA Cryptographic API implementation.
+ *
+ * Different key derivation algorithms require a different number of inputs. Instead of having an API that
+ * takes as input variable length arrays, which can be problemmatic to manage on embedded platforms, the inputs
+ * are passed to the driver via a function, `pcd_key_derivation_collateral`, that is called multiple times with different `collateral_id`s.
+ * Thus, for a key derivation algorithm that required 3 paramter inputs, the flow would look something like:
+```C
+pcd_key_derivation_setup(kdf_algorithm, source_key, dest_key_size_bytes);
+pcd_key_derivation_collateral(kdf_algorithm_collateral_id_0, p_collateral_0, collateral_0_size);
+pcd_key_derivation_collateral(kdf_algorithm_collateral_id_1, p_collateral_1, collateral_1_size);
+pcd_key_derivation_collateral(kdf_algorithm_collateral_id_2, p_collateral_2, collateral_2_size);
+pcd_key_derivation_derive();
+```
+
+key agreement example:
+```C
+pcd_key_derivation_setup(alg, source_key. dest_key_size_bytes);
+pcd_key_derivation_collateral(DHE_PUBKEY, p_pubkey, pubkey_size);
+pcd_key_derivation_export(p_session_key, session_key_size, &session_key_length);
+```
+ */
+
+/** \brief Set up a key derivation operation by specifying the algorithm and the source key sot
+ *
+ * \param kdf_alg The algorithm to be used for the key derivation
+ * \param souce_key The key to be used as the source material for the key derivation
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t ( *pcd_key_derivation_setup_t )( psa_algorithm_t kdf_alg, psa_key_slot_t source_key );
+
+/** \brief Provide collateral (parameters) needed for a key derivation or key agreement operation
+ *
+ * Since many key derivation algorithms require multiple parameters, it is expeced that this function may be called multiple
+ * times for the same operation, each with a different algorithm-specific `collateral_id`
+ *
+ * \param collateral_id
+ * \param p_collateral
+ * \param collateral_size
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_key_derivation_collateral_t ) ( uint32_t collateral_id, const uint8_t p_collateral, uint32_t collateral_size );
+
+/** \brief Perform the final key derivation step and place the generated key material in a slot
+ *
+ * param dest_key The slot where the generated key material should be placed
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t ( *pcd_key_derivation_derive_t )( psa_key_slot_t dest_key );
+
+/** \brief Pefform the final step of a key agreement and place the generated key material in a buffer
+ *
+ * \param p_output
+ * \param output_size
+ * \param p_output_length
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t ( *pcd_key_derivation_export_t )( uint8_t *p_output, uint32_t output_size, uint32_t *p_output_length );
+
+/**
+ * \brief A struct containing all of the function pointers needed to for key derivation and agreement
+ *
+ * PSA Crypto API implementations should populate instances of the table as appropriate upon startup.
+ *
+ * If one of the functions is not implemented, it should be set to NULL.
+ */
+struct pcd_key_derivation_t {
+ pcd_key_derivation_setup_t *p_setup; /**< Function that performs the key derivation setup */
+ pcd_key_derivation_collateral_t *p_collateral; /**< Function that sets the key derivation collateral */
+ pcd_key_derivation_derive_t *p_derive; /**< Function that performs the final key derivation step */
+ pcd_key_derivation_export_t *p_export; /**< Function that perforsm the final key derivation or agreement and exports the key */
+};
+
+/** @}
+ */
+
+#endif // __PSA_CRYPTO_DRIVER_H__
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