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Convert cipher and pk to PSA attribute-based key creation

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This fixes the build under MBEDTLS_USE_PSA_CRYPTO.
This commit is contained in:
Gilles Peskine
2019-05-27 14:53:13 +02:00
parent f46f81ceb5
commit d2d45c1738
5 changed files with 74 additions and 102 deletions
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52
library/cipher.c
View File

@ -297,8 +297,7 @@ int mbedtls_cipher_setkey( mbedtls_cipher_context_t *ctx,
psa_status_t status;
psa_key_type_t key_type;
psa_key_usage_t key_usage;
psa_key_policy_t key_policy;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
/* PSA Crypto API only accepts byte-aligned keys. */
if( key_bitlen % 8 != 0 )
@ -312,40 +311,33 @@ int mbedtls_cipher_setkey( mbedtls_cipher_context_t *ctx,
ctx->cipher_info->type );
if( key_type == 0 )
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
/* Allocate a key slot to use. */
status = psa_allocate_key( &cipher_psa->slot );
if( status != PSA_SUCCESS )
return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED );
/* Indicate that we own the key slot and need to
* destroy it in mbedtls_cipher_free(). */
cipher_psa->slot_state = MBEDTLS_CIPHER_PSA_KEY_OWNED;
/* From that point on, the responsibility for destroying the
* key slot is on mbedtls_cipher_free(). This includes the case
* where the policy setup or key import below fail, as
* mbedtls_cipher_free() needs to be called in any case. */
/* Setup policy for the new key slot. */
key_policy = psa_key_policy_init();
psa_set_key_type( &attributes, key_type );
/* Mbed TLS' cipher layer doesn't enforce the mode of operation
* (encrypt vs. decrypt): it is possible to setup a key for encryption
* and use it for AEAD decryption. Until tests relying on this
* are changed, allow any usage in PSA. */
/* key_usage = mbedtls_psa_translate_cipher_operation( operation ); */
key_usage = PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT;
psa_key_policy_set_usage( &key_policy, key_usage, cipher_psa->alg );
status = psa_set_key_policy( cipher_psa->slot, &key_policy );
if( status != PSA_SUCCESS )
return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED );
psa_set_key_usage_flags( &attributes,
/* mbedtls_psa_translate_cipher_operation( operation ); */
PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT );
psa_set_key_algorithm( &attributes, cipher_psa->alg );
/* Populate new key slot. */
status = psa_import_key_to_handle( cipher_psa->slot,
key_type, key, key_bytelen );
if( status != PSA_SUCCESS )
return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED );
status = psa_import_key( &attributes, key, key_bytelen,
&cipher_psa->slot );
switch( status )
{
case PSA_SUCCESS:
break;
case PSA_ERROR_INSUFFICIENT_MEMORY:
return( MBEDTLS_ERR_CIPHER_ALLOC_FAILED );
case PSA_ERROR_NOT_SUPPORTED:
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
default:
return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED );
}
/* Indicate that we own the key slot and need to
* destroy it in mbedtls_cipher_free(). */
cipher_psa->slot_state = MBEDTLS_CIPHER_PSA_KEY_OWNED;
ctx->key_bitlen = key_bitlen;
ctx->operation = operation;

33
library/pk.c
View File

@ -158,14 +158,17 @@ int mbedtls_pk_setup( mbedtls_pk_context *ctx, const mbedtls_pk_info_t *info )
int mbedtls_pk_setup_opaque( mbedtls_pk_context *ctx, const psa_key_handle_t key )
{
const mbedtls_pk_info_t * const info = &mbedtls_pk_opaque_info;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_key_handle_t *pk_ctx;
psa_key_type_t type;
if( ctx == NULL || ctx->pk_info != NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
if( PSA_SUCCESS != psa_get_key_information( key, &type, NULL ) )
if( PSA_SUCCESS != psa_get_key_attributes( key, &attributes ) )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
type = psa_get_key_type( &attributes );
psa_reset_key_attributes( &attributes );
/* Current implementation of can_do() relies on this. */
if( ! PSA_KEY_TYPE_IS_ECC_KEY_PAIR( type ) )
@ -589,19 +592,18 @@ mbedtls_pk_type_t mbedtls_pk_get_type( const mbedtls_pk_context *ctx )
* Currently only works for EC private keys.
*/
int mbedtls_pk_wrap_as_opaque( mbedtls_pk_context *pk,
psa_key_handle_t *slot,
psa_key_handle_t *handle,
psa_algorithm_t hash_alg )
{
#if !defined(MBEDTLS_ECP_C)
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
#else
psa_key_handle_t key;
const mbedtls_ecp_keypair *ec;
unsigned char d[MBEDTLS_ECP_MAX_BYTES];
size_t d_len;
psa_ecc_curve_t curve_id;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_key_type_t key_type;
psa_key_policy_t policy;
int ret;
/* export the private key material in the format PSA wants */
@ -617,29 +619,20 @@ int mbedtls_pk_wrap_as_opaque( mbedtls_pk_context *pk,
key_type = PSA_KEY_TYPE_ECC_KEY_PAIR(
mbedtls_psa_parse_tls_ecc_group ( curve_id ) );
/* allocate a key slot */
if( PSA_SUCCESS != psa_allocate_key( &key ) )
return( MBEDTLS_ERR_PK_HW_ACCEL_FAILED );
/* prepare the key attributes */
psa_set_key_type( &attributes, key_type );
psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_SIGN );
psa_set_key_algorithm( &attributes, PSA_ALG_ECDSA(hash_alg) );
/* set policy */
policy = psa_key_policy_init();
psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_SIGN,
PSA_ALG_ECDSA(hash_alg) );
if( PSA_SUCCESS != psa_set_key_policy( key, &policy ) )
/* import private key into PSA */
if( PSA_SUCCESS != psa_import_key( &attributes, d, d_len, handle ) )
return( MBEDTLS_ERR_PK_HW_ACCEL_FAILED );
/* import private key in slot */
if( PSA_SUCCESS != psa_import_key_to_handle( key, key_type, d, d_len ) )
return( MBEDTLS_ERR_PK_HW_ACCEL_FAILED );
/* remember slot number to be destroyed later by caller */
*slot = key;
/* make PK context wrap the key slot */
mbedtls_pk_free( pk );
mbedtls_pk_init( pk );
return( mbedtls_pk_setup_opaque( pk, key ) );
return( mbedtls_pk_setup_opaque( pk, *handle ) );
#endif /* MBEDTLS_ECP_C */
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */

46
library/pk_wrap.c
View File

@ -546,9 +546,9 @@ static int ecdsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
const unsigned char *sig, size_t sig_len )
{
int ret;
psa_key_handle_t key_slot;
psa_key_policy_t policy;
psa_key_type_t psa_type;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_key_handle_t key_handle = 0;
psa_status_t status;
mbedtls_pk_context key;
int key_len;
/* see ECP_PUB_DER_MAX_BYTES in pkwrite.c */
@ -576,23 +576,17 @@ static int ecdsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
if( psa_md == 0 )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
psa_sig_md = PSA_ALG_ECDSA( psa_md );
psa_type = PSA_KEY_TYPE_ECC_PUBLIC_KEY( curve );
if( ( ret = psa_allocate_key( &key_slot ) ) != PSA_SUCCESS )
return( mbedtls_psa_err_translate_pk( ret ) );
psa_set_key_type( &attributes, PSA_KEY_TYPE_ECC_PUBLIC_KEY( curve ) );
psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_VERIFY );
psa_set_key_algorithm( &attributes, psa_sig_md );
policy = psa_key_policy_init();
psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_VERIFY, psa_sig_md );
if( ( ret = psa_set_key_policy( key_slot, &policy ) ) != PSA_SUCCESS )
status = psa_import_key( &attributes,
buf + sizeof( buf ) - key_len, key_len,
&key_handle );
if( status != PSA_SUCCESS )
{
ret = mbedtls_psa_err_translate_pk( ret );
goto cleanup;
}
if( psa_import_key_to_handle( key_slot, psa_type, buf + sizeof( buf ) - key_len, key_len )
!= PSA_SUCCESS )
{
ret = MBEDTLS_ERR_PK_BAD_INPUT_DATA;
ret = mbedtls_psa_err_translate_pk( status );
goto cleanup;
}
@ -611,7 +605,7 @@ static int ecdsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
goto cleanup;
}
if( psa_asymmetric_verify( key_slot, psa_sig_md,
if( psa_asymmetric_verify( key_handle, psa_sig_md,
hash, hash_len,
buf, 2 * signature_part_size )
!= PSA_SUCCESS )
@ -628,7 +622,7 @@ static int ecdsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
ret = 0;
cleanup:
psa_destroy_key( key_slot );
psa_destroy_key( key_handle );
return( ret );
}
#else /* MBEDTLS_USE_PSA_CRYPTO */
@ -898,10 +892,13 @@ static size_t pk_opaque_get_bitlen( const void *ctx )
{
const psa_key_handle_t *key = (const psa_key_handle_t *) ctx;
size_t bits;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
if( PSA_SUCCESS != psa_get_key_information( *key, NULL, &bits ) )
if( PSA_SUCCESS != psa_get_key_attributes( *key, &attributes ) )
return( 0 );
bits = psa_get_key_bits( &attributes );
psa_reset_key_attributes( &attributes );
return( bits );
}
@ -1002,8 +999,9 @@ static int pk_opaque_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
{
const psa_key_handle_t *key = (const psa_key_handle_t *) ctx;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_algorithm_t alg = PSA_ALG_ECDSA( mbedtls_psa_translate_md( md_alg ) );
size_t bits, buf_len;
size_t buf_len;
psa_status_t status;
/* PSA has its own RNG */
@ -1014,11 +1012,11 @@ static int pk_opaque_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,
* that information. Assume that the buffer is large enough for a
* maximal-length signature with that key (otherwise the application is
* buggy anyway). */
status = psa_get_key_information( *key, NULL, &bits );
status = psa_get_key_attributes( *key, &attributes );
if( status != PSA_SUCCESS )
return( mbedtls_psa_err_translate_pk( status ) );
buf_len = MBEDTLS_ECDSA_MAX_SIG_LEN( bits );
buf_len = MBEDTLS_ECDSA_MAX_SIG_LEN( psa_get_key_bits( &attributes ) );
psa_reset_key_attributes( &attributes );
/* make the signature */
status = psa_asymmetric_sign( *key, alg, hash, hash_len,

9
library/pkwrite.c
View File

@ -246,17 +246,16 @@ int mbedtls_pk_write_pubkey_der( mbedtls_pk_context *key, unsigned char *buf, si
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( pk_type == MBEDTLS_PK_OPAQUE )
{
psa_status_t status;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_key_type_t key_type;
psa_key_handle_t handle;
psa_ecc_curve_t curve;
handle = *((psa_key_handle_t*) key->pk_ctx );
status = psa_get_key_information( handle, &key_type,
NULL /* bitsize not needed */ );
if( status != PSA_SUCCESS )
if( PSA_SUCCESS != psa_get_key_attributes( handle, &attributes ) )
return( MBEDTLS_ERR_PK_HW_ACCEL_FAILED );
key_type = psa_get_key_type( &attributes );
psa_reset_key_attributes( &attributes );
curve = PSA_KEY_TYPE_GET_CURVE( key_type );
if( curve == 0 )