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Remove permitting of 8 byte nonce with PolyChaCha

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Also unify nonce length checking

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
This commit is contained in:
Paul Elliott 2021-06-23 18:49:56 +01:00
parent 0187651647
commit cf2d66e022
1 changed files with 29 additions and 6 deletions
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35
library/psa_crypto_aead.c
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@ -247,6 +247,21 @@ static psa_status_t psa_aead_unpadded_locate_tag( size_t tag_length,
return( PSA_SUCCESS );
}
static psa_status_t mbedtls_aead_check_nonce_length(
mbedtls_psa_aead_operation_t *operation,
size_t nonce_length )
{
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
if( operation->alg == PSA_ALG_CHACHA20_POLY1305 )
{
if( nonce_length != 12 )
return( PSA_ERROR_NOT_SUPPORTED );
}
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
return PSA_SUCCESS;
}
psa_status_t mbedtls_psa_aead_decrypt(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer, size_t key_buffer_size,
@ -272,6 +287,13 @@ psa_status_t mbedtls_psa_aead_decrypt(
if( status != PSA_SUCCESS )
goto exit;
if( mbedtls_aead_check_nonce_length( &operation, nonce_length )
!= PSA_SUCCESS)
{
status = PSA_ERROR_NOT_SUPPORTED;
goto exit;
}
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
if( operation.alg == PSA_ALG_CCM )
{
@ -303,7 +325,7 @@ psa_status_t mbedtls_psa_aead_decrypt(
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
if( operation.alg == PSA_ALG_CHACHA20_POLY1305 )
{
if( nonce_length != 12 || operation.tag_length != 16 )
if( operation.tag_length != 16 )
{
status = PSA_ERROR_NOT_SUPPORTED;
goto exit;
@ -397,6 +419,12 @@ psa_status_t mbedtls_psa_aead_set_nonce(
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
if( mbedtls_aead_check_nonce_length( operation, nonce_length )
!= PSA_SUCCESS)
{
return( PSA_ERROR_INVALID_ARGUMENT );
}
#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
if( operation->alg == PSA_ALG_GCM )
{
@ -412,11 +440,6 @@ psa_status_t mbedtls_psa_aead_set_nonce(
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
if( operation->alg == PSA_ALG_CHACHA20_POLY1305 )
{
if( nonce_length != 12 && nonce_length != 8)
{
return( PSA_ERROR_INVALID_ARGUMENT );
}
status = mbedtls_to_psa_error(
mbedtls_chachapoly_starts( &operation->ctx.chachapoly,
nonce,