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PK: RSA decrypt PSA wrap implementation

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Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
This commit is contained in:
Neil Armstrong 2022-02-09 15:32:45 +01:00
parent 502da11df1
commit 18f43c7304
1 changed files with 76 additions and 0 deletions
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76
library/pk_wrap.c
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@ -212,6 +212,81 @@ static int rsa_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,
hash, sig ) );
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
static int rsa_decrypt_wrap( void *ctx,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
{
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_PRV_DER_MAX_BYTES in pkwrite.c */
unsigned char buf[47 + 3 * MBEDTLS_MPI_MAX_SIZE + \
5 * ( MBEDTLS_MPI_MAX_SIZE / 2 + MBEDTLS_MPI_MAX_SIZE % 2 )];
mbedtls_pk_info_t pk_info = mbedtls_rsa_info;
psa_algorithm_t psa_sig_md;
((void) f_rng);
((void) p_rng);
#if !defined(MBEDTLS_RSA_ALT)
switch( rsa->padding )
{
case MBEDTLS_RSA_PKCS_V15:
psa_sig_md = PSA_ALG_RSA_PKCS1V15_CRYPT;
break;
default:
return( MBEDTLS_ERR_RSA_INVALID_PADDING );
}
#else
psa_sig_md = PSA_ALG_RSA_PKCS1V15_CRYPT;
#endif
if( ilen != mbedtls_rsa_get_len( rsa ) )
return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
/* mbedtls_pk_write_key_der() 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_key_der( &key, buf, sizeof( buf ) );
if( key_len <= 0 )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
psa_set_key_type( &attributes, PSA_KEY_TYPE_RSA_KEY_PAIR );
psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_DECRYPT );
psa_set_key_algorithm( &attributes, psa_sig_md );
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_asymmetric_decrypt( key_id, psa_sig_md, input, ilen,
NULL, 0, output, osize, olen);
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_decrypt_wrap( void *ctx,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
@ -225,6 +300,7 @@ static int rsa_decrypt_wrap( void *ctx,
return( mbedtls_rsa_pkcs1_decrypt( rsa, f_rng, p_rng,
olen, input, output, osize ) );
}
#endif
static int rsa_encrypt_wrap( void *ctx,
const unsigned char *input, size_t ilen,