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Use the attribute-based key creation interface in sample programs

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This commit is contained in:
Gilles Peskine 2019-04-18 13:39:40 +02:00
parent ff5f0e7221
commit dfea0a2510
2 changed files with 42 additions and 64 deletions
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52
programs/psa/crypto_examples.c
View file

@ -39,20 +39,6 @@ int main( void )
}
#else
static psa_status_t set_key_policy( psa_key_handle_t key_handle,
psa_key_usage_t key_usage,
psa_algorithm_t alg )
{
psa_status_t status;
psa_key_policy_t policy = PSA_KEY_POLICY_INIT;
psa_key_policy_set_usage( &policy, key_usage, alg );
status = psa_set_key_policy( key_handle, &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,
@ -161,6 +147,7 @@ cipher_example_encrypt_decrypt_aes_cbc_nopad_1_block( void )
const psa_algorithm_t alg = PSA_ALG_CBC_NO_PADDING;
psa_status_t status;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_key_handle_t key_handle = 0;
size_t output_len = 0;
uint8_t iv[block_size];
@ -171,15 +158,12 @@ cipher_example_encrypt_decrypt_aes_cbc_nopad_1_block( void )
status = psa_generate_random( input, sizeof( input ) );
ASSERT_STATUS( status, PSA_SUCCESS );
status = psa_allocate_key( &key_handle );
ASSERT_STATUS( status, PSA_SUCCESS );
psa_set_key_usage_flags( &attributes,
PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT );
psa_set_key_algorithm( &attributes, alg );
psa_set_key_type( &attributes, PSA_KEY_TYPE_AES );
status = set_key_policy( key_handle,
PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT,
alg );
ASSERT_STATUS( status, PSA_SUCCESS );
status = psa_generate_key_to_handle( key_handle, PSA_KEY_TYPE_AES, key_bits,
status = psa_generate_key( &attributes, &key_handle, key_bits,
NULL, 0 );
ASSERT_STATUS( status, PSA_SUCCESS );
@ -213,6 +197,7 @@ static psa_status_t cipher_example_encrypt_decrypt_aes_cbc_pkcs7_multi( void )
const psa_algorithm_t alg = PSA_ALG_CBC_PKCS7;
psa_status_t status;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_key_handle_t key_handle = 0;
size_t output_len = 0;
uint8_t iv[block_size], input[input_size],
@ -224,12 +209,12 @@ static psa_status_t cipher_example_encrypt_decrypt_aes_cbc_pkcs7_multi( void )
status = psa_allocate_key( &key_handle );
ASSERT_STATUS( status, PSA_SUCCESS );
status = set_key_policy( key_handle,
PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT,
alg );
ASSERT_STATUS( status, PSA_SUCCESS );
psa_set_key_usage_flags( &attributes,
PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT );
psa_set_key_algorithm( &attributes, alg );
psa_set_key_type( &attributes, PSA_KEY_TYPE_AES );
status = psa_generate_key_to_handle( key_handle, PSA_KEY_TYPE_AES, key_bits,
status = psa_generate_key( &attributes, &key_handle, key_bits,
NULL, 0 );
ASSERT_STATUS( status, PSA_SUCCESS );
@ -262,6 +247,7 @@ static psa_status_t cipher_example_encrypt_decrypt_aes_ctr_multi( void )
const psa_algorithm_t alg = PSA_ALG_CTR;
psa_status_t status;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_key_handle_t key_handle = 0;
size_t output_len = 0;
uint8_t iv[block_size], input[input_size], encrypt[input_size],
@ -270,14 +256,12 @@ static psa_status_t cipher_example_encrypt_decrypt_aes_ctr_multi( void )
status = psa_generate_random( input, sizeof( input ) );
ASSERT_STATUS( status, PSA_SUCCESS );
status = psa_allocate_key( &key_handle );
ASSERT_STATUS( status, PSA_SUCCESS );
status = set_key_policy( key_handle,
PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT,
alg );
ASSERT_STATUS( status, PSA_SUCCESS );
psa_set_key_usage_flags( &attributes,
PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT );
psa_set_key_algorithm( &attributes, alg );
psa_set_key_type( &attributes, PSA_KEY_TYPE_AES );
status = psa_generate_key_to_handle( key_handle, PSA_KEY_TYPE_AES, key_bits,
status = psa_generate_key( &attributes, &key_handle, key_bits,
NULL, 0 );
ASSERT_STATUS( status, PSA_SUCCESS );

54
programs/psa/key_ladder_demo.c
View file

@ -200,16 +200,14 @@ static psa_status_t generate( const char *key_file_name )
{
psa_status_t status = PSA_SUCCESS;
psa_key_handle_t key_handle = 0;
psa_key_policy_t policy = PSA_KEY_POLICY_INIT;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
PSA_CHECK( psa_allocate_key( &key_handle ) );
psa_key_policy_set_usage( &policy,
PSA_KEY_USAGE_DERIVE | PSA_KEY_USAGE_EXPORT,
KDF_ALG );
PSA_CHECK( psa_set_key_policy( key_handle, &policy ) );
psa_set_key_usage_flags( &attributes,
PSA_KEY_USAGE_DERIVE | PSA_KEY_USAGE_EXPORT );
psa_set_key_algorithm( &attributes, KDF_ALG );
psa_set_key_type( &attributes, PSA_KEY_TYPE_DERIVE );
PSA_CHECK( psa_generate_key_to_handle( key_handle,
PSA_KEY_TYPE_DERIVE,
PSA_CHECK( psa_generate_key( &attributes, &key_handle,
PSA_BYTES_TO_BITS( KEY_SIZE_BYTES ),
NULL, 0 ) );
@ -231,7 +229,7 @@ static psa_status_t import_key_from_file( psa_key_usage_t usage,
psa_key_handle_t *master_key_handle )
{
psa_status_t status = PSA_SUCCESS;
psa_key_policy_t policy = PSA_KEY_POLICY_INIT;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
uint8_t key_data[KEY_SIZE_BYTES];
size_t key_size;
FILE *key_file = NULL;
@ -252,11 +250,10 @@ static psa_status_t import_key_from_file( psa_key_usage_t usage,
SYS_CHECK( fclose( key_file ) == 0 );
key_file = NULL;
PSA_CHECK( psa_allocate_key( master_key_handle ) );
psa_key_policy_set_usage( &policy, usage, alg );
PSA_CHECK( psa_set_key_policy( *master_key_handle, &policy ) );
PSA_CHECK( psa_import_key_to_handle( *master_key_handle,
PSA_KEY_TYPE_DERIVE,
psa_set_key_usage_flags( &attributes, usage );
psa_set_key_algorithm( &attributes, alg );
psa_set_key_type( &attributes, PSA_KEY_TYPE_DERIVE );
PSA_CHECK( psa_import_key( &attributes, master_key_handle,
key_data, key_size ) );
exit:
if( key_file != NULL )
@ -282,12 +279,14 @@ static psa_status_t derive_key_ladder( const char *ladder[],
psa_key_handle_t *key_handle )
{
psa_status_t status = PSA_SUCCESS;
psa_key_policy_t policy = PSA_KEY_POLICY_INIT;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_crypto_generator_t generator = PSA_CRYPTO_GENERATOR_INIT;
size_t i;
psa_key_policy_set_usage( &policy,
PSA_KEY_USAGE_DERIVE | PSA_KEY_USAGE_EXPORT,
KDF_ALG );
psa_set_key_usage_flags( &attributes,
PSA_KEY_USAGE_DERIVE | PSA_KEY_USAGE_EXPORT );
psa_set_key_algorithm( &attributes, KDF_ALG );
psa_set_key_type( &attributes, PSA_KEY_TYPE_DERIVE );
/* For each label in turn, ... */
for( i = 0; i < ladder_depth; i++ )
@ -305,13 +304,10 @@ static psa_status_t derive_key_ladder( const char *ladder[],
* since it is no longer needed. */
PSA_CHECK( psa_close_key( *key_handle ) );
*key_handle = 0;
PSA_CHECK( psa_allocate_key( key_handle ) );
PSA_CHECK( psa_set_key_policy( *key_handle, &policy ) );
/* Use the generator obtained from the parent key to create
* the next intermediate key. */
PSA_CHECK( psa_generator_import_key_to_handle(
*key_handle,
PSA_KEY_TYPE_DERIVE,
PSA_CHECK( psa_generator_import_key(
&attributes, key_handle,
PSA_BYTES_TO_BITS( KEY_SIZE_BYTES ),
&generator ) );
PSA_CHECK( psa_generator_abort( &generator ) );
@ -333,13 +329,13 @@ static psa_status_t derive_wrapping_key( psa_key_usage_t usage,
psa_key_handle_t *wrapping_key_handle )
{
psa_status_t status = PSA_SUCCESS;
psa_key_policy_t policy = PSA_KEY_POLICY_INIT;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_crypto_generator_t generator = PSA_CRYPTO_GENERATOR_INIT;
*wrapping_key_handle = 0;
PSA_CHECK( psa_allocate_key( wrapping_key_handle ) );
psa_key_policy_set_usage( &policy, usage, WRAPPING_ALG );
PSA_CHECK( psa_set_key_policy( *wrapping_key_handle, &policy ) );
psa_set_key_usage_flags( &attributes, usage );
psa_set_key_algorithm( &attributes, WRAPPING_ALG );
psa_set_key_type( &attributes, PSA_KEY_TYPE_AES );
PSA_CHECK( psa_key_derivation(
&generator,
@ -348,9 +344,7 @@ static psa_status_t derive_wrapping_key( psa_key_usage_t usage,
WRAPPING_KEY_SALT, WRAPPING_KEY_SALT_LENGTH,
NULL, 0,
PSA_BITS_TO_BYTES( WRAPPING_KEY_BITS ) ) );
PSA_CHECK( psa_generator_import_key_to_handle(
*wrapping_key_handle,
PSA_KEY_TYPE_AES,
PSA_CHECK( psa_generator_import_key( &attributes, wrapping_key_handle,
WRAPPING_KEY_BITS,
&generator ) );