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Add implementation of mbedtls_pk_can_do_ext()

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Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
This commit is contained in:
Neil Armstrong 2022-05-11 14:11:25 +02:00
parent 0b5295848e
commit a88b15897d
1 changed files with 88 additions and 0 deletions
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88
library/pk.c
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@ -232,6 +232,94 @@ int mbedtls_pk_can_do( const mbedtls_pk_context *ctx, mbedtls_pk_type_t type )
return( ctx->pk_info->can_do( type ) );
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
/*
* Tell if a PK can do the operations of the given PSA algorithm
*/
int mbedtls_pk_can_do_ext( const mbedtls_pk_context *ctx, psa_algorithm_t alg )
{
/* A context with null pk_info is not set up yet and can't do anything.
* For backward compatibility, also accept NULL instead of a context
* pointer. */
if( ctx == NULL || ctx->pk_info == NULL )
return( 0 );
/* Filter out non allowed algorithms */
if( PSA_ALG_IS_ECDSA( alg ) == 0 &&
PSA_ALG_IS_RSA_PKCS1V15_SIGN( alg ) == 0 &&
PSA_ALG_IS_RSA_PSS( alg ) == 0 &&
alg != PSA_ALG_RSA_PKCS1V15_CRYPT &&
PSA_ALG_IS_ECDH( alg ) == 0 )
return( 0 );
/* Wildcard hash is not allowed */
if( PSA_ALG_IS_SIGN_HASH( alg ) &&
PSA_ALG_SIGN_GET_HASH( alg ) == PSA_ALG_ANY_HASH )
return( 0 );
if( mbedtls_pk_get_type( ctx ) != MBEDTLS_PK_OPAQUE )
{
mbedtls_pk_type_t type;
if( PSA_ALG_IS_ECDSA( alg ) || PSA_ALG_IS_ECDH( alg ) )
type = MBEDTLS_PK_ECKEY;
else if( PSA_ALG_IS_RSA_PKCS1V15_SIGN( alg ) ||
alg == PSA_ALG_RSA_PKCS1V15_CRYPT )
type = MBEDTLS_PK_RSA;
else if( PSA_ALG_IS_RSA_PSS( alg ) )
type = MBEDTLS_PK_RSASSA_PSS;
else
return( 0 );
return( ctx->pk_info->can_do( type ) );
}
const mbedtls_svc_key_id_t *key = (const mbedtls_svc_key_id_t *) ctx->pk_ctx;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_algorithm_t key_alg, key_alg2;
psa_status_t status;
status = psa_get_key_attributes( *key, &attributes );
if( status != PSA_SUCCESS )
return( 0 );
key_alg = psa_get_key_algorithm( &attributes );
key_alg2 = psa_get_key_enrollment_algorithm( &attributes );
psa_reset_key_attributes( &attributes );
/*
* Common case: the key alg & alg2 only allows alg.
* This will match PSA_ALG_RSA_PKCS1V15_CRYPT & PSA_ALG_IS_ECDH
* directly.
* This would also match ECDSA/RSA_PKCS1V15_SIGN/RSA_PSS with
* a fixed hash on key_alg/key_alg2.
*/
if( alg == key_alg || alg == key_alg2 )
return( 1 );
/*
* If key alg or alg2 is a hash-and-sign with a wildcard for the hash,
* and alg is the same hash-and-sign family with any hash,
* then alg is compliant with this key alg
*/
if( PSA_ALG_IS_SIGN_HASH( alg ) )
{
if( PSA_ALG_IS_SIGN_HASH( key_alg ) &&
PSA_ALG_SIGN_GET_HASH( key_alg ) == PSA_ALG_ANY_HASH &&
( alg & ~PSA_ALG_HASH_MASK ) == ( key_alg & ~PSA_ALG_HASH_MASK ) )
return( 1 );
if( PSA_ALG_IS_SIGN_HASH( key_alg2 ) &&
PSA_ALG_SIGN_GET_HASH( key_alg2 ) == PSA_ALG_ANY_HASH &&
( alg & ~PSA_ALG_HASH_MASK ) == ( key_alg2 & ~PSA_ALG_HASH_MASK ) )
return( 1 );
}
return( 0 );
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
/*
* Helper for mbedtls_pk_sign and mbedtls_pk_verify
*/