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Implement PSA-based AEAD enc/dec cipher operations

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This commit is contained in:
Hanno Becker 2018-11-12 16:26:46 +00:00
parent 20120b373e
commit fe73adee5a
1 changed files with 53 additions and 4 deletions
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57
library/cipher.c
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@ -1289,8 +1289,32 @@ int mbedtls_cipher_auth_encrypt( mbedtls_cipher_context_t *ctx,
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( ctx->psa_enabled == 1 )
{
/* TODO */
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
/* As in the non-PSA case, we don't check that
* a key has been set. If not, the key slot will
* still be in its default state of 0, which is
* guaranteed to be invalid, hence the PSA-call
* below will gracefully fail. */
mbedtls_cipher_context_psa * const cipher_psa =
(mbedtls_cipher_context_psa *) ctx->cipher_ctx;
psa_status_t status;
/* PSA Crypto API always writes the authentication tag
* at the end of the encrypted message. */
if( tag != output + ilen )
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
status = psa_aead_encrypt( cipher_psa->slot,
cipher_psa->alg,
iv, iv_len,
ad, ad_len,
input, ilen,
output, ilen + tag_len, olen );
if( status != PSA_SUCCESS )
return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED );
*olen -= tag_len;
return( 0 );
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
@ -1344,8 +1368,33 @@ int mbedtls_cipher_auth_decrypt( mbedtls_cipher_context_t *ctx,
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( ctx->psa_enabled == 1 )
{
/* TODO */
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
/* As in the non-PSA case, we don't check that
* a key has been set. If not, the key slot will
* still be in its default state of 0, which is
* guaranteed to be invalid, hence the PSA-call
* below will gracefully fail. */
mbedtls_cipher_context_psa * const cipher_psa =
(mbedtls_cipher_context_psa *) ctx->cipher_ctx;
psa_status_t status;
/* PSA Crypto API always writes the authentication tag
* at the end of the encrypted message. */
if( tag != input + ilen )
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
status = psa_aead_decrypt( cipher_psa->slot,
cipher_psa->alg,
iv, iv_len,
ad, ad_len,
input, ilen + tag_len,
output, ilen, olen );
if( status == PSA_ERROR_INVALID_SIGNATURE )
return( MBEDTLS_ERR_CIPHER_AUTH_FAILED );
else if( status != PSA_SUCCESS )
return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED );
return( 0 );
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */