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psa: Disallow repeated setup

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Calling psa_*_setup() twice on a MAC, cipher, or hash context should
result in a PSA_ERROR_BAD_STATE error because the operation has already
been set up.

Fixes #10
This commit is contained in:
Jaeden Amero 2019-02-19 09:25:10 +00:00
parent 11aa7ee189
commit 36ee5d0fbf
2 changed files with 45 additions and 1 deletions
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20
library/psa_crypto.c
View file

@ -1379,7 +1379,13 @@ psa_status_t psa_hash_setup( psa_hash_operation_t *operation,
psa_algorithm_t alg )
{
int ret;
operation->alg = 0;
/* A context must be freshly initialized before it can be set up. */
if( operation->alg != 0 )
{
return( PSA_ERROR_BAD_STATE );
}
switch( alg )
{
#if defined(MBEDTLS_MD2_C)
@ -1998,6 +2004,12 @@ static psa_status_t psa_mac_setup( psa_mac_operation_t *operation,
unsigned char truncated = PSA_MAC_TRUNCATED_LENGTH( alg );
psa_algorithm_t full_length_alg = PSA_ALG_FULL_LENGTH_MAC( alg );
/* A context must be freshly initialized before it can be set up. */
if( operation->alg != 0 )
{
return( PSA_ERROR_BAD_STATE );
}
status = psa_mac_init( operation, full_length_alg );
if( status != PSA_SUCCESS )
return( status );
@ -2909,6 +2921,12 @@ static psa_status_t psa_cipher_setup( psa_cipher_operation_t *operation,
PSA_KEY_USAGE_ENCRYPT :
PSA_KEY_USAGE_DECRYPT );
/* A context must be freshly initialized before it can be set up. */
if( operation->alg != 0 )
{
return( PSA_ERROR_BAD_STATE );
}
status = psa_cipher_init( operation, alg );
if( status != PSA_SUCCESS )
return( status );

26
tests/suites/test_suite_psa_crypto.function
View file

@ -2012,6 +2012,12 @@ void hash_bad_order( )
PSA_ASSERT( psa_crypto_init( ) );
/* Call setup twice in a row. */
PSA_ASSERT( psa_hash_setup( &operation, alg ) );
TEST_EQUAL( psa_hash_setup( &operation, alg ),
PSA_ERROR_BAD_STATE );
PSA_ASSERT( psa_hash_abort( &operation ) );
/* Call update without calling setup beforehand. */
TEST_EQUAL( psa_hash_update( &operation, input, sizeof( input ) ),
PSA_ERROR_BAD_STATE );
@ -2336,6 +2342,14 @@ void mac_bad_order( )
PSA_ERROR_BAD_STATE );
PSA_ASSERT( psa_mac_abort( &operation ) );
/* Call setup twice in a row. */
PSA_ASSERT( psa_mac_sign_setup( &operation,
handle, alg ) );
TEST_EQUAL( psa_mac_sign_setup( &operation,
handle, alg ),
PSA_ERROR_BAD_STATE );
PSA_ASSERT( psa_mac_abort( &operation ) );
/* Call update after sign finish. */
PSA_ASSERT( psa_mac_sign_setup( &operation,
handle, alg ) );
@ -2601,6 +2615,18 @@ void cipher_bad_order( )
key, sizeof(key) ) );
/* Call encrypt setup twice in a row. */
PSA_ASSERT( psa_cipher_encrypt_setup( &operation, handle, alg ) );
TEST_EQUAL( psa_cipher_encrypt_setup( &operation, handle, alg ),
PSA_ERROR_BAD_STATE );
PSA_ASSERT( psa_cipher_abort( &operation ) );
/* Call decrypt setup twice in a row. */
PSA_ASSERT( psa_cipher_decrypt_setup( &operation, handle, alg ) );
TEST_EQUAL( psa_cipher_decrypt_setup( &operation, handle, alg ),
PSA_ERROR_BAD_STATE );
PSA_ASSERT( psa_cipher_abort( &operation ) );
/* Generate an IV without calling setup beforehand. */
TEST_EQUAL( psa_cipher_generate_iv( &operation,
buffer, sizeof( buffer ),