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PK: RSA verification PSA wrap implementation

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Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
This commit is contained in:
Neil Armstrong 2022-02-22 15:30:24 +01:00
parent 56d51274d8
commit 52f41f8228
1 changed files with 62 additions and 0 deletions
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62
library/pk_wrap.c
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@ -164,9 +164,70 @@ static size_t rsa_get_bitlen( const void *ctx )
return( 8 * mbedtls_rsa_get_len( rsa ) );
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
static int rsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len )
{
mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
psa_status_t status;
mbedtls_pk_context key;
int key_len;
/* see RSA_PUR_DER_MAX_BYTES in pkwrite.c */
unsigned char buf[38 + 2 * MBEDTLS_MPI_MAX_SIZE];
mbedtls_pk_info_t pk_info = mbedtls_rsa_info;
psa_algorithm_t psa_alg_md = PSA_ALG_RSA_PKCS1V15_SIGN( mbedtls_psa_translate_md( md_alg ) );
size_t rsa_len = mbedtls_rsa_get_len( rsa );
#if SIZE_MAX > UINT_MAX
if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
#endif /* SIZE_MAX > UINT_MAX */
if( sig_len < rsa_len )
return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
/* mbedtls_pk_write_pubkey() expects a full PK context;
* re-construct one to make it happy */
key.pk_info = &pk_info;
key.pk_ctx = ctx;
key_len = mbedtls_pk_write_pubkey_der( &key, buf, sizeof( buf ) );
if( key_len <= 0 )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_VERIFY_HASH );
psa_set_key_algorithm( &attributes, psa_alg_md );
psa_set_key_type( &attributes, PSA_KEY_TYPE_RSA_PUBLIC_KEY );
status = psa_import_key( &attributes,
buf + sizeof( buf ) - key_len, key_len,
&key_id );
if( status != PSA_SUCCESS )
{
ret = mbedtls_psa_err_translate_pk( status );
goto cleanup;
}
status = psa_verify_hash( key_id, psa_alg_md, hash, hash_len,
sig, sig_len );
if( status != PSA_SUCCESS )
{
ret = mbedtls_psa_err_translate_pk( status );
goto cleanup;
}
ret = 0;
cleanup:
psa_destroy_key( key_id );
return( ret );
}
#else
static int rsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;
@ -195,6 +256,7 @@ static int rsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
return( 0 );
}
#endif
#if defined(MBEDTLS_PSA_CRYPTO_C)
int mbedtls_pk_psa_rsa_sign_ext( psa_algorithm_t alg,