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psa: sign/verify_hash: Wrap software implementation

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Wrap sign/verify_hash software implementation into
psa_sign/verify_hash_internal() functions whose
signature is that of a sign/verify_hash driver
entry point.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit is contained in:
Ronald Cron 2020-12-08 16:32:23 +01:00
parent 99b8ed7fda
commit 1865993763
1 changed files with 106 additions and 80 deletions
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186
library/psa_crypto.c
View file

@ -3341,57 +3341,14 @@ cleanup:
#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA) ||
* defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA) */
psa_status_t psa_sign_hash( mbedtls_svc_key_id_t key,
psa_algorithm_t alg,
const uint8_t *hash,
size_t hash_length,
uint8_t *signature,
size_t signature_size,
size_t *signature_length )
static psa_status_t psa_sign_hash_internal(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer, size_t key_buffer_size,
psa_algorithm_t alg, const uint8_t *hash, size_t hash_length,
uint8_t *signature, size_t signature_size, size_t *signature_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
psa_key_slot_t *slot;
*signature_length = signature_size;
/* Immediately reject a zero-length signature buffer. This guarantees
* that signature must be a valid pointer. (On the other hand, the hash
* buffer can in principle be empty since it doesn't actually have
* to be a hash.) */
if( signature_size == 0 )
return( PSA_ERROR_BUFFER_TOO_SMALL );
status = psa_get_and_lock_key_slot_with_policy( key, &slot,
PSA_KEY_USAGE_SIGN_HASH,
alg );
if( status != PSA_SUCCESS )
goto exit;
if( ! PSA_KEY_TYPE_IS_KEY_PAIR( slot->attr.type ) )
{
status = PSA_ERROR_INVALID_ARGUMENT;
goto exit;
}
/* Try any of the available accelerators first */
status = psa_driver_wrapper_sign_hash( slot,
alg,
hash,
hash_length,
signature,
signature_size,
signature_length );
if( status != PSA_ERROR_NOT_SUPPORTED ||
psa_key_lifetime_is_external( slot->attr.lifetime ) )
goto exit;
psa_key_attributes_t attributes_struct = {
.core = slot->attr
};
psa_key_attributes_t *attributes = &attributes_struct;
const uint8_t *key_buffer = slot->key.data;
size_t key_buffer_size = slot->key.bytes;
/* If the operation was not supported by any accelerator, try fallback. */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) || \
defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS)
if( attributes->core.type == PSA_KEY_TYPE_RSA_KEY_PAIR )
@ -3457,6 +3414,62 @@ psa_status_t psa_sign_hash( mbedtls_svc_key_id_t key,
status = PSA_ERROR_NOT_SUPPORTED;
}
exit:
return( status );
}
psa_status_t psa_sign_hash( mbedtls_svc_key_id_t key,
psa_algorithm_t alg,
const uint8_t *hash,
size_t hash_length,
uint8_t *signature,
size_t signature_size,
size_t *signature_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
psa_key_slot_t *slot;
*signature_length = signature_size;
/* Immediately reject a zero-length signature buffer. This guarantees
* that signature must be a valid pointer. (On the other hand, the hash
* buffer can in principle be empty since it doesn't actually have
* to be a hash.) */
if( signature_size == 0 )
return( PSA_ERROR_BUFFER_TOO_SMALL );
status = psa_get_and_lock_key_slot_with_policy( key, &slot,
PSA_KEY_USAGE_SIGN_HASH,
alg );
if( status != PSA_SUCCESS )
goto exit;
if( ! PSA_KEY_TYPE_IS_KEY_PAIR( slot->attr.type ) )
{
status = PSA_ERROR_INVALID_ARGUMENT;
goto exit;
}
/* Try any of the available accelerators first */
status = psa_driver_wrapper_sign_hash( slot,
alg,
hash,
hash_length,
signature,
signature_size,
signature_length );
if( status != PSA_ERROR_NOT_SUPPORTED ||
psa_key_lifetime_is_external( slot->attr.lifetime ) )
goto exit;
/* If the operation was not supported by any accelerator, try fallback. */
psa_key_attributes_t attributes = {
.core = slot->attr
};
status = psa_sign_hash_internal(
&attributes, slot->key.data, slot->key.bytes,
alg, hash, hash_length,
signature, signature_size, signature_length );
exit:
/* Fill the unused part of the output buffer (the whole buffer on error,
* the trailing part on success) with something that isn't a valid mac
@ -3475,40 +3488,13 @@ exit:
return( ( status == PSA_SUCCESS ) ? unlock_status : status );
}
psa_status_t psa_verify_hash( mbedtls_svc_key_id_t key,
psa_algorithm_t alg,
const uint8_t *hash,
size_t hash_length,
const uint8_t *signature,
size_t signature_length )
static psa_status_t psa_verify_hash_internal(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer, size_t key_buffer_size,
psa_algorithm_t alg, const uint8_t *hash, size_t hash_length,
const uint8_t *signature, size_t signature_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
psa_key_slot_t *slot;
status = psa_get_and_lock_key_slot_with_policy( key, &slot,
PSA_KEY_USAGE_VERIFY_HASH,
alg );
if( status != PSA_SUCCESS )
return( status );
/* Try any of the available accelerators first */
status = psa_driver_wrapper_verify_hash( slot,
alg,
hash,
hash_length,
signature,
signature_length );
if( status != PSA_ERROR_NOT_SUPPORTED ||
psa_key_lifetime_is_external( slot->attr.lifetime ) )
goto exit;
psa_key_attributes_t attributes_struct = {
.core = slot->attr
};
psa_key_attributes_t *attributes = &attributes_struct;
const uint8_t *key_buffer = slot->key.data;
size_t key_buffer_size = slot->key.bytes;
#if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) || \
defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS)
@ -3568,6 +3554,46 @@ psa_status_t psa_verify_hash( mbedtls_svc_key_id_t key,
status = PSA_ERROR_NOT_SUPPORTED;
}
exit:
return( status );
}
psa_status_t psa_verify_hash( mbedtls_svc_key_id_t key,
psa_algorithm_t alg,
const uint8_t *hash,
size_t hash_length,
const uint8_t *signature,
size_t signature_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
psa_key_slot_t *slot;
status = psa_get_and_lock_key_slot_with_policy( key, &slot,
PSA_KEY_USAGE_VERIFY_HASH,
alg );
if( status != PSA_SUCCESS )
return( status );
/* Try any of the available accelerators first */
status = psa_driver_wrapper_verify_hash( slot,
alg,
hash,
hash_length,
signature,
signature_length );
if( status != PSA_ERROR_NOT_SUPPORTED ||
psa_key_lifetime_is_external( slot->attr.lifetime ) )
goto exit;
psa_key_attributes_t attributes = {
.core = slot->attr
};
status = psa_verify_hash_internal(
&attributes, slot->key.data, slot->key.bytes,
alg, hash, hash_length,
signature, signature_length );
exit:
unlock_status = psa_unlock_key_slot( slot );