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Implement safe buffer copying in asymm. encryption

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Use local copy buffer macros to implement safe
copy mechanism in asymmetric encryption API.

Signed-off-by: Thomas Daubney <thomas.daubney@arm.com>
This commit is contained in:
Thomas Daubney 2024-01-18 18:10:32 +00:00
parent ad736991bb
commit 6adbb2a351
1 changed files with 27 additions and 6 deletions
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33
library/psa_crypto.c
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@ -3283,11 +3283,11 @@ exit:
psa_status_t psa_asymmetric_encrypt(mbedtls_svc_key_id_t key,
psa_algorithm_t alg,
const uint8_t *input,
const uint8_t *input_external,
size_t input_length,
const uint8_t *salt,
const uint8_t *salt_external,
size_t salt_length,
uint8_t *output,
uint8_t *output_external,
size_t output_size,
size_t *output_length)
{
@ -3295,6 +3295,9 @@ psa_status_t psa_asymmetric_encrypt(mbedtls_svc_key_id_t key,
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
psa_key_slot_t *slot;
psa_key_attributes_t attributes;
LOCAL_INPUT_DECLARE(input_external, input);
LOCAL_INPUT_DECLARE(salt_external, salt);
LOCAL_OUTPUT_DECLARE(output_external, output);
(void) input;
(void) input_length;
@ -3323,6 +3326,9 @@ psa_status_t psa_asymmetric_encrypt(mbedtls_svc_key_id_t key,
.core = slot->attr
};
LOCAL_INPUT_ALLOC(input_external, input_length, input);
LOCAL_INPUT_ALLOC(salt_external, salt_length, salt);
LOCAL_OUTPUT_ALLOC(output_external, output_size, output);
status = psa_driver_wrapper_asymmetric_encrypt(
&attributes, slot->key.data, slot->key.bytes,
alg, input, input_length, salt, salt_length,
@ -3330,16 +3336,20 @@ psa_status_t psa_asymmetric_encrypt(mbedtls_svc_key_id_t key,
exit:
unlock_status = psa_unregister_read(slot);
LOCAL_INPUT_FREE(input_external, input);
LOCAL_INPUT_FREE(salt_external, salt);
LOCAL_OUTPUT_FREE(output_external, output);
return (status == PSA_SUCCESS) ? unlock_status : status;
}
psa_status_t psa_asymmetric_decrypt(mbedtls_svc_key_id_t key,
psa_algorithm_t alg,
const uint8_t *input,
const uint8_t *input_external,
size_t input_length,
const uint8_t *salt,
const uint8_t *salt_external,
size_t salt_length,
uint8_t *output,
uint8_t *output_external,
size_t output_size,
size_t *output_length)
{
@ -3348,6 +3358,10 @@ psa_status_t psa_asymmetric_decrypt(mbedtls_svc_key_id_t key,
psa_key_slot_t *slot;
psa_key_attributes_t attributes;
LOCAL_INPUT_DECLARE(input_external, input);
LOCAL_INPUT_DECLARE(salt_external, salt);
LOCAL_OUTPUT_DECLARE(output_external, output);
(void) input;
(void) input_length;
(void) salt;
@ -3374,6 +3388,9 @@ psa_status_t psa_asymmetric_decrypt(mbedtls_svc_key_id_t key,
.core = slot->attr
};
LOCAL_INPUT_ALLOC(input_external, input_length, input);
LOCAL_INPUT_ALLOC(salt_external, salt_length, salt);
LOCAL_OUTPUT_ALLOC(output_external, output_size, output);
status = psa_driver_wrapper_asymmetric_decrypt(
&attributes, slot->key.data, slot->key.bytes,
alg, input, input_length, salt, salt_length,
@ -3382,6 +3399,10 @@ psa_status_t psa_asymmetric_decrypt(mbedtls_svc_key_id_t key,
exit:
unlock_status = psa_unregister_read(slot);
LOCAL_INPUT_FREE(input_external, input);
LOCAL_INPUT_FREE(salt_external, salt);
LOCAL_OUTPUT_FREE(output_external, output);
return (status == PSA_SUCCESS) ? unlock_status : status;
}