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psa: programs: Add cipher AES CBC no padding

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itayzafrir 2018-07-11 13:44:41 +03:00
parent a3ff8a6ed5
commit 10366708d6
1 changed files with 210 additions and 0 deletions
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210
programs/psa/crypto_examples.c
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@ -1,4 +1,214 @@
#include "psa/crypto.h"
#include <string.h>
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdio.h>
#define mbedtls_printf printf
#endif
#define ASSERT( predicate ) \
do \
{ \
if( ! ( predicate ) ) \
{ \
mbedtls_printf( "\tassertion failed at %s:%d - '%s'\r\n", \
__FILE__, __LINE__, #predicate); \
goto exit; \
} \
} while ( 0 )
#define ASSERT_STATUS( actual, expected ) \
do \
{ \
if( ( actual ) != ( expected ) ) \
{ \
mbedtls_printf( "\tassertion failed at %s:%d - " \
"actual:%d expected:%d\r\n", __FILE__, __LINE__, \
(psa_status_t) actual, (psa_status_t) expected ); \
goto exit; \
} \
} while ( 0 )
/* Use key slot 1 for our cipher key. Key slot 0 is reserved as unused. */
static const psa_key_slot_t key_slot_cipher = 1;
static psa_status_t set_key_policy( psa_key_slot_t key_slot,
psa_key_usage_t key_usage,
psa_algorithm_t alg )
{
psa_status_t status;
psa_key_policy_t policy;
psa_key_policy_init( &policy );
psa_key_policy_set_usage( &policy, key_usage, alg );
status = psa_set_key_policy( key_slot, &policy );
ASSERT_STATUS( status, PSA_SUCCESS );
exit:
return( status );
}
static psa_status_t cipher_operation( psa_cipher_operation_t *operation,
const uint8_t * input,
size_t input_size,
size_t part_size,
uint8_t * output,
size_t output_size,
size_t *output_len )
{
psa_status_t status;
size_t bytes_to_write = 0, bytes_written = 0, len = 0;
*output_len = 0;
while( bytes_written != input_size )
{
bytes_to_write = ( input_size - bytes_written > part_size ?
part_size :
input_size - bytes_written );
status = psa_cipher_update( operation, input + bytes_written,
bytes_to_write, output + *output_len,
output_size - *output_len, &len );
ASSERT_STATUS( status, PSA_SUCCESS );
bytes_written += bytes_to_write;
*output_len += len;
}
status = psa_cipher_finish( operation, output + *output_len,
output_size - *output_len, &len );
ASSERT_STATUS( status, PSA_SUCCESS );
*output_len += len;
exit:
return( status );
}
static psa_status_t cipher_encrypt( psa_key_slot_t key_slot,
psa_algorithm_t alg,
uint8_t * iv,
size_t iv_size,
const uint8_t * input,
size_t input_size,
size_t part_size,
uint8_t * output,
size_t output_size,
size_t *output_len )
{
psa_status_t status;
psa_cipher_operation_t operation;
size_t iv_len = 0;
memset( &operation, 0, sizeof( operation ) );
status = psa_cipher_encrypt_setup( &operation, key_slot, alg );
ASSERT_STATUS( status, PSA_SUCCESS );
status = psa_cipher_generate_iv( &operation, iv, iv_size, &iv_len );
ASSERT_STATUS( status, PSA_SUCCESS );
status = cipher_operation( &operation, input, input_size, part_size,
output, output_size, output_len );
ASSERT_STATUS( status, PSA_SUCCESS );
exit:
psa_cipher_abort( &operation );
return( status );
}
static psa_status_t cipher_decrypt( psa_key_slot_t key_slot,
psa_algorithm_t alg,
const uint8_t * iv,
size_t iv_size,
const uint8_t * input,
size_t input_size,
size_t part_size,
uint8_t * output,
size_t output_size,
size_t *output_len )
{
psa_status_t status;
psa_cipher_operation_t operation;
memset( &operation, 0, sizeof( operation ) );
status = psa_cipher_decrypt_setup( &operation, key_slot, alg );
ASSERT_STATUS( status, PSA_SUCCESS );
status = psa_cipher_set_iv( &operation, iv, iv_size );
ASSERT_STATUS( status, PSA_SUCCESS );
status = cipher_operation( &operation, input, input_size, part_size,
output, output_size, output_len );
ASSERT_STATUS( status, PSA_SUCCESS );
exit:
psa_cipher_abort( &operation );
return( status );
}
static psa_status_t
cipher_example_encrypt_decrypt_aes_cbc_nopad_1_block( void )
{
enum {
block_size = PSA_BLOCK_CIPHER_BLOCK_SIZE( PSA_KEY_TYPE_AES ),
key_bits = 256,
part_size = block_size,
};
const psa_algorithm_t alg = PSA_ALG_CBC_BASE |
PSA_ALG_BLOCK_CIPHER_PAD_NONE;
psa_status_t status;
size_t output_len = 0;
uint8_t iv[block_size];
uint8_t input[block_size];
uint8_t encrypt[block_size];
uint8_t decrypt[block_size];
status = psa_generate_random( input, sizeof( input ) );
ASSERT_STATUS( status, PSA_SUCCESS );
status = set_key_policy( key_slot_cipher,
PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT,
alg );
ASSERT_STATUS( status, PSA_SUCCESS );
status = psa_generate_key( key_slot_cipher, PSA_KEY_TYPE_AES, key_bits,
NULL, 0 );
ASSERT_STATUS( status, PSA_SUCCESS );
status = cipher_encrypt( key_slot_cipher, alg, iv, sizeof( iv ),
input, sizeof( input ), part_size,
encrypt, sizeof( encrypt ), &output_len );
ASSERT_STATUS( status, PSA_SUCCESS );
status = cipher_decrypt( key_slot_cipher, alg, iv, sizeof( iv ),
encrypt, output_len, part_size,
decrypt, sizeof( decrypt ), &output_len );
ASSERT_STATUS( status, PSA_SUCCESS );
status = memcmp( input, decrypt, sizeof( input ) );
ASSERT_STATUS( status, PSA_SUCCESS );
exit:
psa_destroy_key( key_slot_cipher );
return( status );
}
static void cipher_examples( void )
{
psa_status_t status;
mbedtls_printf( "cipher encrypt/decrypt AES CBC no padding:\r\n" );
status = cipher_example_encrypt_decrypt_aes_cbc_nopad_1_block( );
if( status == PSA_SUCCESS )
mbedtls_printf( "\tsuccess!\r\n" );
}
int main( void )
{
ASSERT( psa_crypto_init( ) == PSA_SUCCESS );
cipher_examples( );
exit:
mbedtls_psa_crypto_free( );
return( 0 );
}