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exercise_key: support modes where IV length is not 16

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Support ECB, which has no IV. The code also now supports arbitrary IV
lengths based on the algorithm and key type.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2022-03-18 18:40:47 +01:00
parent c47d3a4286
commit bbf452c689
1 changed files with 18 additions and 12 deletions
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20
tests/src/psa_exercise_key.c
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@ -166,18 +166,27 @@ static int exercise_cipher_key( mbedtls_svc_key_id_t key,
psa_cipher_operation_t operation = PSA_CIPHER_OPERATION_INIT;
unsigned char iv[16] = {0};
size_t iv_length = sizeof( iv );
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_key_type_t key_type;
const unsigned char plaintext[16] = "Hello, world...";
unsigned char ciphertext[32] = "(wabblewebblewibblewobblewubble)";
size_t ciphertext_length = sizeof( ciphertext );
unsigned char decrypted[sizeof( ciphertext )];
size_t part_length;
PSA_ASSERT( psa_get_key_attributes( key, &attributes ) );
key_type = psa_get_key_type( &attributes );
iv_length = PSA_CIPHER_IV_LENGTH( key_type, alg );
if( usage & PSA_KEY_USAGE_ENCRYPT )
{
PSA_ASSERT( psa_cipher_encrypt_setup( &operation, key, alg ) );
if( PSA_CIPHER_IV_LENGTH( key_type, alg ) != 0 )
{
PSA_ASSERT( psa_cipher_generate_iv( &operation,
iv, sizeof( iv ),
&iv_length ) );
}
PSA_ASSERT( psa_cipher_update( &operation,
plaintext, sizeof( plaintext ),
ciphertext, sizeof( ciphertext ),
@ -195,18 +204,14 @@ static int exercise_cipher_key( mbedtls_svc_key_id_t key,
int maybe_invalid_padding = 0;
if( ! ( usage & PSA_KEY_USAGE_ENCRYPT ) )
{
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
PSA_ASSERT( psa_get_key_attributes( key, &attributes ) );
/* This should be PSA_CIPHER_GET_IV_SIZE but the API doesn't
* have this macro yet. */
iv_length = PSA_BLOCK_CIPHER_BLOCK_LENGTH(
psa_get_key_type( &attributes ) );
maybe_invalid_padding = ! PSA_ALG_IS_STREAM_CIPHER( alg );
psa_reset_key_attributes( &attributes );
}
PSA_ASSERT( psa_cipher_decrypt_setup( &operation, key, alg ) );
if( iv_length != 0 )
{
PSA_ASSERT( psa_cipher_set_iv( &operation,
iv, iv_length ) );
}
PSA_ASSERT( psa_cipher_update( &operation,
ciphertext, ciphertext_length,
decrypted, sizeof( decrypted ),
@ -229,6 +234,7 @@ static int exercise_cipher_key( mbedtls_svc_key_id_t key,
exit:
psa_cipher_abort( &operation );
psa_reset_key_attributes( &attributes );
return( 0 );
}