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psa: aead: Move AEAD driver entry points to psa_crypto_aead.c

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Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit is contained in:
Ronald Cron 2021-03-17 08:16:34 +01:00
parent 7ceee8d30a
commit 46f9178d85
3 changed files with 457 additions and 328 deletions
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330
library/psa_crypto.c
View file

@ -3509,222 +3509,6 @@ psa_status_t psa_cipher_abort( psa_cipher_operation_t *operation )
/* AEAD */
/****************************************************************/
typedef struct
{
const mbedtls_cipher_info_t *cipher_info;
union
{
unsigned dummy; /* Make the union non-empty even with no supported algorithms. */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
mbedtls_ccm_context ccm;
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CCM */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
mbedtls_gcm_context gcm;
#endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
mbedtls_chachapoly_context chachapoly;
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
} ctx;
psa_algorithm_t core_alg;
uint8_t full_tag_length;
uint8_t tag_length;
} aead_operation_t;
#define AEAD_OPERATION_INIT {0, {0}, 0, 0, 0}
static void psa_aead_abort_internal( aead_operation_t *operation )
{
switch( operation->core_alg )
{
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
case PSA_ALG_CCM:
mbedtls_ccm_free( &operation->ctx.ccm );
break;
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CCM */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
case PSA_ALG_GCM:
mbedtls_gcm_free( &operation->ctx.gcm );
break;
#endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
}
}
static psa_status_t psa_aead_setup(
aead_operation_t *operation,
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer,
psa_algorithm_t alg )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
size_t key_bits;
mbedtls_cipher_id_t cipher_id;
key_bits = attributes->core.bits;
operation->cipher_info =
mbedtls_cipher_info_from_psa( alg, attributes->core.type, key_bits,
&cipher_id );
if( operation->cipher_info == NULL )
return( PSA_ERROR_NOT_SUPPORTED );
switch( PSA_ALG_AEAD_WITH_SHORTENED_TAG( alg, 0 ) )
{
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
case PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CCM, 0 ):
operation->core_alg = PSA_ALG_CCM;
operation->full_tag_length = 16;
/* CCM allows the following tag lengths: 4, 6, 8, 10, 12, 14, 16.
* The call to mbedtls_ccm_encrypt_and_tag or
* mbedtls_ccm_auth_decrypt will validate the tag length. */
if( PSA_BLOCK_CIPHER_BLOCK_LENGTH( attributes->core.type ) != 16 )
return( PSA_ERROR_INVALID_ARGUMENT );
mbedtls_ccm_init( &operation->ctx.ccm );
status = mbedtls_to_psa_error(
mbedtls_ccm_setkey( &operation->ctx.ccm, cipher_id,
key_buffer, (unsigned int) key_bits ) );
if( status != PSA_SUCCESS )
return( status );
break;
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CCM */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
case PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_GCM, 0 ):
operation->core_alg = PSA_ALG_GCM;
operation->full_tag_length = 16;
/* GCM allows the following tag lengths: 4, 8, 12, 13, 14, 15, 16.
* The call to mbedtls_gcm_crypt_and_tag or
* mbedtls_gcm_auth_decrypt will validate the tag length. */
if( PSA_BLOCK_CIPHER_BLOCK_LENGTH( attributes->core.type ) != 16 )
return( PSA_ERROR_INVALID_ARGUMENT );
mbedtls_gcm_init( &operation->ctx.gcm );
status = mbedtls_to_psa_error(
mbedtls_gcm_setkey( &operation->ctx.gcm, cipher_id,
key_buffer, (unsigned int) key_bits ) );
if( status != PSA_SUCCESS )
return( status );
break;
#endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
case PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CHACHA20_POLY1305, 0 ):
operation->core_alg = PSA_ALG_CHACHA20_POLY1305;
operation->full_tag_length = 16;
/* We only support the default tag length. */
if( alg != PSA_ALG_CHACHA20_POLY1305 )
return( PSA_ERROR_NOT_SUPPORTED );
mbedtls_chachapoly_init( &operation->ctx.chachapoly );
status = mbedtls_to_psa_error(
mbedtls_chachapoly_setkey( &operation->ctx.chachapoly,
key_buffer ) );
if( status != PSA_SUCCESS )
return( status );
break;
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
default:
return( PSA_ERROR_NOT_SUPPORTED );
}
if( PSA_AEAD_TAG_LENGTH( alg ) > operation->full_tag_length )
return( PSA_ERROR_INVALID_ARGUMENT );
operation->tag_length = PSA_AEAD_TAG_LENGTH( alg );
return( PSA_SUCCESS );
}
static psa_status_t psa_aead_encrypt_internal(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer, size_t key_buffer_size,
psa_algorithm_t alg,
const uint8_t *nonce, size_t nonce_length,
const uint8_t *additional_data, size_t additional_data_length,
const uint8_t *plaintext, size_t plaintext_length,
uint8_t *ciphertext, size_t ciphertext_size, size_t *ciphertext_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
aead_operation_t operation = AEAD_OPERATION_INIT;
uint8_t *tag;
(void) key_buffer_size;
status = psa_aead_setup( &operation, attributes, key_buffer, alg );
if( status != PSA_SUCCESS )
goto exit;
/* For all currently supported modes, the tag is at the end of the
* ciphertext. */
if( ciphertext_size < ( plaintext_length + operation.tag_length ) )
{
status = PSA_ERROR_BUFFER_TOO_SMALL;
goto exit;
}
tag = ciphertext + plaintext_length;
#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
if( operation.core_alg == PSA_ALG_GCM )
{
status = mbedtls_to_psa_error(
mbedtls_gcm_crypt_and_tag( &operation.ctx.gcm,
MBEDTLS_GCM_ENCRYPT,
plaintext_length,
nonce, nonce_length,
additional_data, additional_data_length,
plaintext, ciphertext,
operation.tag_length, tag ) );
}
else
#endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
if( operation.core_alg == PSA_ALG_CCM )
{
status = mbedtls_to_psa_error(
mbedtls_ccm_encrypt_and_tag( &operation.ctx.ccm,
plaintext_length,
nonce, nonce_length,
additional_data,
additional_data_length,
plaintext, ciphertext,
tag, operation.tag_length ) );
}
else
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CCM */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
if( operation.core_alg == PSA_ALG_CHACHA20_POLY1305 )
{
if( nonce_length != 12 || operation.tag_length != 16 )
{
status = PSA_ERROR_NOT_SUPPORTED;
goto exit;
}
status = mbedtls_to_psa_error(
mbedtls_chachapoly_encrypt_and_tag( &operation.ctx.chachapoly,
plaintext_length,
nonce,
additional_data,
additional_data_length,
plaintext,
ciphertext,
tag ) );
}
else
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
{
(void) tag;
return( PSA_ERROR_NOT_SUPPORTED );
}
if( status == PSA_SUCCESS )
*ciphertext_length = plaintext_length + operation.tag_length;
exit:
psa_aead_abort_internal( &operation );
return( status );
}
psa_status_t psa_aead_encrypt( mbedtls_svc_key_id_t key,
psa_algorithm_t alg,
const uint8_t *nonce,
@ -3751,7 +3535,7 @@ psa_status_t psa_aead_encrypt( mbedtls_svc_key_id_t key,
.core = slot->attr
};
status = psa_aead_encrypt_internal(
status = mbedtls_psa_aead_encrypt(
&attributes, slot->key.data, slot->key.bytes,
alg,
nonce, nonce_length,
@ -3767,114 +3551,6 @@ psa_status_t psa_aead_encrypt( mbedtls_svc_key_id_t key,
return( status );
}
/* Locate the tag in a ciphertext buffer containing the encrypted data
* followed by the tag. Return the length of the part preceding the tag in
* *plaintext_length. This is the size of the plaintext in modes where
* the encrypted data has the same size as the plaintext, such as
* CCM and GCM. */
static psa_status_t psa_aead_unpadded_locate_tag( size_t tag_length,
const uint8_t *ciphertext,
size_t ciphertext_length,
size_t plaintext_size,
const uint8_t **p_tag )
{
size_t payload_length;
if( tag_length > ciphertext_length )
return( PSA_ERROR_INVALID_ARGUMENT );
payload_length = ciphertext_length - tag_length;
if( payload_length > plaintext_size )
return( PSA_ERROR_BUFFER_TOO_SMALL );
*p_tag = ciphertext + payload_length;
return( PSA_SUCCESS );
}
static psa_status_t psa_aead_decrypt_internal(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer, size_t key_buffer_size,
psa_algorithm_t alg,
const uint8_t *nonce, size_t nonce_length,
const uint8_t *additional_data, size_t additional_data_length,
const uint8_t *ciphertext, size_t ciphertext_length,
uint8_t *plaintext, size_t plaintext_size, size_t *plaintext_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
aead_operation_t operation = AEAD_OPERATION_INIT;
const uint8_t *tag = NULL;
(void) key_buffer_size;
status = psa_aead_setup( &operation, attributes, key_buffer, alg );
if( status != PSA_SUCCESS )
goto exit;
status = psa_aead_unpadded_locate_tag( operation.tag_length,
ciphertext, ciphertext_length,
plaintext_size, &tag );
if( status != PSA_SUCCESS )
goto exit;
#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
if( operation.core_alg == PSA_ALG_GCM )
{
status = mbedtls_to_psa_error(
mbedtls_gcm_auth_decrypt( &operation.ctx.gcm,
ciphertext_length - operation.tag_length,
nonce, nonce_length,
additional_data,
additional_data_length,
tag, operation.tag_length,
ciphertext, plaintext ) );
}
else
#endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
if( operation.core_alg == PSA_ALG_CCM )
{
status = mbedtls_to_psa_error(
mbedtls_ccm_auth_decrypt( &operation.ctx.ccm,
ciphertext_length - operation.tag_length,
nonce, nonce_length,
additional_data,
additional_data_length,
ciphertext, plaintext,
tag, operation.tag_length ) );
}
else
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CCM */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
if( operation.core_alg == PSA_ALG_CHACHA20_POLY1305 )
{
if( nonce_length != 12 || operation.tag_length != 16 )
{
status = PSA_ERROR_NOT_SUPPORTED;
goto exit;
}
status = mbedtls_to_psa_error(
mbedtls_chachapoly_auth_decrypt( &operation.ctx.chachapoly,
ciphertext_length - operation.tag_length,
nonce,
additional_data,
additional_data_length,
tag,
ciphertext,
plaintext ) );
}
else
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
{
return( PSA_ERROR_NOT_SUPPORTED );
}
if( status == PSA_SUCCESS )
*plaintext_length = ciphertext_length - operation.tag_length;
exit:
psa_aead_abort_internal( &operation );
if( status == PSA_SUCCESS )
*plaintext_length = ciphertext_length - operation.tag_length;
return( status );
}
psa_status_t psa_aead_decrypt( mbedtls_svc_key_id_t key,
psa_algorithm_t alg,
const uint8_t *nonce,
@ -3901,7 +3577,7 @@ psa_status_t psa_aead_decrypt( mbedtls_svc_key_id_t key,
.core = slot->attr
};
status = psa_aead_decrypt_internal(
status = mbedtls_psa_aead_decrypt(
&attributes, slot->key.data, slot->key.bytes,
alg,
nonce, nonce_length,
@ -3917,8 +3593,6 @@ psa_status_t psa_aead_decrypt( mbedtls_svc_key_id_t key,
return( status );
}
/****************************************************************/
/* Generators */
/****************************************************************/

330
library/psa_crypto_aead.c
View file

@ -23,6 +23,336 @@
#if defined(MBEDTLS_PSA_CRYPTO_C)
#include "psa_crypto_aead.h"
#include "psa_crypto_core.h"
#include "mbedtls/ccm.h"
#include "mbedtls/chachapoly.h"
#include "mbedtls/cipher.h"
#include "mbedtls/gcm.h"
typedef struct
{
const mbedtls_cipher_info_t *cipher_info;
union
{
unsigned dummy; /* Make the union non-empty even with no supported algorithms. */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
mbedtls_ccm_context ccm;
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CCM */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
mbedtls_gcm_context gcm;
#endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
mbedtls_chachapoly_context chachapoly;
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
} ctx;
psa_algorithm_t core_alg;
uint8_t full_tag_length;
uint8_t tag_length;
} aead_operation_t;
#define AEAD_OPERATION_INIT {0, {0}, 0, 0, 0}
static void psa_aead_abort_internal( aead_operation_t *operation )
{
switch( operation->core_alg )
{
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
case PSA_ALG_CCM:
mbedtls_ccm_free( &operation->ctx.ccm );
break;
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CCM */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
case PSA_ALG_GCM:
mbedtls_gcm_free( &operation->ctx.gcm );
break;
#endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
}
}
static psa_status_t psa_aead_setup(
aead_operation_t *operation,
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer,
psa_algorithm_t alg )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
size_t key_bits;
mbedtls_cipher_id_t cipher_id;
key_bits = attributes->core.bits;
operation->cipher_info =
mbedtls_cipher_info_from_psa( alg, attributes->core.type, key_bits,
&cipher_id );
if( operation->cipher_info == NULL )
return( PSA_ERROR_NOT_SUPPORTED );
switch( PSA_ALG_AEAD_WITH_SHORTENED_TAG( alg, 0 ) )
{
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
case PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CCM, 0 ):
operation->core_alg = PSA_ALG_CCM;
operation->full_tag_length = 16;
/* CCM allows the following tag lengths: 4, 6, 8, 10, 12, 14, 16.
* The call to mbedtls_ccm_encrypt_and_tag or
* mbedtls_ccm_auth_decrypt will validate the tag length. */
if( PSA_BLOCK_CIPHER_BLOCK_LENGTH( attributes->core.type ) != 16 )
return( PSA_ERROR_INVALID_ARGUMENT );
mbedtls_ccm_init( &operation->ctx.ccm );
status = mbedtls_to_psa_error(
mbedtls_ccm_setkey( &operation->ctx.ccm, cipher_id,
key_buffer, (unsigned int) key_bits ) );
if( status != PSA_SUCCESS )
return( status );
break;
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CCM */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
case PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_GCM, 0 ):
operation->core_alg = PSA_ALG_GCM;
operation->full_tag_length = 16;
/* GCM allows the following tag lengths: 4, 8, 12, 13, 14, 15, 16.
* The call to mbedtls_gcm_crypt_and_tag or
* mbedtls_gcm_auth_decrypt will validate the tag length. */
if( PSA_BLOCK_CIPHER_BLOCK_LENGTH( attributes->core.type ) != 16 )
return( PSA_ERROR_INVALID_ARGUMENT );
mbedtls_gcm_init( &operation->ctx.gcm );
status = mbedtls_to_psa_error(
mbedtls_gcm_setkey( &operation->ctx.gcm, cipher_id,
key_buffer, (unsigned int) key_bits ) );
if( status != PSA_SUCCESS )
return( status );
break;
#endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
case PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CHACHA20_POLY1305, 0 ):
operation->core_alg = PSA_ALG_CHACHA20_POLY1305;
operation->full_tag_length = 16;
/* We only support the default tag length. */
if( alg != PSA_ALG_CHACHA20_POLY1305 )
return( PSA_ERROR_NOT_SUPPORTED );
mbedtls_chachapoly_init( &operation->ctx.chachapoly );
status = mbedtls_to_psa_error(
mbedtls_chachapoly_setkey( &operation->ctx.chachapoly,
key_buffer ) );
if( status != PSA_SUCCESS )
return( status );
break;
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
default:
return( PSA_ERROR_NOT_SUPPORTED );
}
if( PSA_AEAD_TAG_LENGTH( alg ) > operation->full_tag_length )
return( PSA_ERROR_INVALID_ARGUMENT );
operation->tag_length = PSA_AEAD_TAG_LENGTH( alg );
return( PSA_SUCCESS );
}
psa_status_t mbedtls_psa_aead_encrypt(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer, size_t key_buffer_size,
psa_algorithm_t alg,
const uint8_t *nonce, size_t nonce_length,
const uint8_t *additional_data, size_t additional_data_length,
const uint8_t *plaintext, size_t plaintext_length,
uint8_t *ciphertext, size_t ciphertext_size, size_t *ciphertext_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
aead_operation_t operation = AEAD_OPERATION_INIT;
uint8_t *tag;
(void) key_buffer_size;
status = psa_aead_setup( &operation, attributes, key_buffer, alg );
if( status != PSA_SUCCESS )
goto exit;
/* For all currently supported modes, the tag is at the end of the
* ciphertext. */
if( ciphertext_size < ( plaintext_length + operation.tag_length ) )
{
status = PSA_ERROR_BUFFER_TOO_SMALL;
goto exit;
}
tag = ciphertext + plaintext_length;
#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
if( operation.core_alg == PSA_ALG_GCM )
{
status = mbedtls_to_psa_error(
mbedtls_gcm_crypt_and_tag( &operation.ctx.gcm,
MBEDTLS_GCM_ENCRYPT,
plaintext_length,
nonce, nonce_length,
additional_data, additional_data_length,
plaintext, ciphertext,
operation.tag_length, tag ) );
}
else
#endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
if( operation.core_alg == PSA_ALG_CCM )
{
status = mbedtls_to_psa_error(
mbedtls_ccm_encrypt_and_tag( &operation.ctx.ccm,
plaintext_length,
nonce, nonce_length,
additional_data,
additional_data_length,
plaintext, ciphertext,
tag, operation.tag_length ) );
}
else
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CCM */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
if( operation.core_alg == PSA_ALG_CHACHA20_POLY1305 )
{
if( nonce_length != 12 || operation.tag_length != 16 )
{
status = PSA_ERROR_NOT_SUPPORTED;
goto exit;
}
status = mbedtls_to_psa_error(
mbedtls_chachapoly_encrypt_and_tag( &operation.ctx.chachapoly,
plaintext_length,
nonce,
additional_data,
additional_data_length,
plaintext,
ciphertext,
tag ) );
}
else
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
{
(void) tag;
return( PSA_ERROR_NOT_SUPPORTED );
}
if( status == PSA_SUCCESS )
*ciphertext_length = plaintext_length + operation.tag_length;
exit:
psa_aead_abort_internal( &operation );
return( status );
}
/* Locate the tag in a ciphertext buffer containing the encrypted data
* followed by the tag. Return the length of the part preceding the tag in
* *plaintext_length. This is the size of the plaintext in modes where
* the encrypted data has the same size as the plaintext, such as
* CCM and GCM. */
static psa_status_t psa_aead_unpadded_locate_tag( size_t tag_length,
const uint8_t *ciphertext,
size_t ciphertext_length,
size_t plaintext_size,
const uint8_t **p_tag )
{
size_t payload_length;
if( tag_length > ciphertext_length )
return( PSA_ERROR_INVALID_ARGUMENT );
payload_length = ciphertext_length - tag_length;
if( payload_length > plaintext_size )
return( PSA_ERROR_BUFFER_TOO_SMALL );
*p_tag = ciphertext + payload_length;
return( PSA_SUCCESS );
}
psa_status_t mbedtls_psa_aead_decrypt(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer, size_t key_buffer_size,
psa_algorithm_t alg,
const uint8_t *nonce, size_t nonce_length,
const uint8_t *additional_data, size_t additional_data_length,
const uint8_t *ciphertext, size_t ciphertext_length,
uint8_t *plaintext, size_t plaintext_size, size_t *plaintext_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
aead_operation_t operation = AEAD_OPERATION_INIT;
const uint8_t *tag = NULL;
(void) key_buffer_size;
status = psa_aead_setup( &operation, attributes, key_buffer, alg );
if( status != PSA_SUCCESS )
goto exit;
status = psa_aead_unpadded_locate_tag( operation.tag_length,
ciphertext, ciphertext_length,
plaintext_size, &tag );
if( status != PSA_SUCCESS )
goto exit;
#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
if( operation.core_alg == PSA_ALG_GCM )
{
status = mbedtls_to_psa_error(
mbedtls_gcm_auth_decrypt( &operation.ctx.gcm,
ciphertext_length - operation.tag_length,
nonce, nonce_length,
additional_data,
additional_data_length,
tag, operation.tag_length,
ciphertext, plaintext ) );
}
else
#endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
if( operation.core_alg == PSA_ALG_CCM )
{
status = mbedtls_to_psa_error(
mbedtls_ccm_auth_decrypt( &operation.ctx.ccm,
ciphertext_length - operation.tag_length,
nonce, nonce_length,
additional_data,
additional_data_length,
ciphertext, plaintext,
tag, operation.tag_length ) );
}
else
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CCM */
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
if( operation.core_alg == PSA_ALG_CHACHA20_POLY1305 )
{
if( nonce_length != 12 || operation.tag_length != 16 )
{
status = PSA_ERROR_NOT_SUPPORTED;
goto exit;
}
status = mbedtls_to_psa_error(
mbedtls_chachapoly_auth_decrypt( &operation.ctx.chachapoly,
ciphertext_length - operation.tag_length,
nonce,
additional_data,
additional_data_length,
tag,
ciphertext,
plaintext ) );
}
else
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
{
return( PSA_ERROR_NOT_SUPPORTED );
}
if( status == PSA_SUCCESS )
*plaintext_length = ciphertext_length - operation.tag_length;
exit:
psa_aead_abort_internal( &operation );
if( status == PSA_SUCCESS )
*plaintext_length = ciphertext_length - operation.tag_length;
return( status );
}
#endif /* MBEDTLS_PSA_CRYPTO_C */

125
library/psa_crypto_aead.h
View file

@ -23,4 +23,129 @@
#include <psa/crypto.h>
/**
* \brief Process an authenticated encryption operation.
*
* \note The signature of this function is that of a PSA driver
* aead_encrypt entry point. This function behaves as an aead_encrypt
* entry point as defined in the PSA driver interface specification for
* transparent drivers.
*
* \param[in] attributes The attributes of the key to use for the
* operation.
* \param[in] key_buffer The buffer containing the key context.
* \param key_buffer_size Size of the \p key_buffer buffer in bytes.
* \param alg The AEAD algorithm to compute.
* \param[in] nonce Nonce or IV to use.
* \param nonce_length Size of the nonce buffer in bytes. This must
* be appropriate for the selected algorithm.
* The default nonce size is
* PSA_AEAD_NONCE_LENGTH(key_type, alg) where
* key_type is the type of key.
* \param[in] additional_data Additional data that will be authenticated
* but not encrypted.
* \param additional_data_length Size of additional_data in bytes.
* \param[in] plaintext Data that will be authenticated and encrypted.
* \param plaintext_length Size of plaintext in bytes.
* \param[out] ciphertext Output buffer for the authenticated and
* encrypted data. The additional data is not
* part of this output. For algorithms where the
* encrypted data and the authentication tag are
* defined as separate outputs, the
* authentication tag is appended to the
* encrypted data.
* \param ciphertext_size Size of the ciphertext buffer in bytes. This
* must be appropriate for the selected algorithm
* and key:
* - A sufficient output size is
* PSA_AEAD_ENCRYPT_OUTPUT_SIZE(key_type, alg,
* plaintext_length) where key_type is the type
* of key.
* - PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE(
* plaintext_length) evaluates to the maximum
* ciphertext size of any supported AEAD
* encryption.
* \param[out] ciphertext_length On success, the size of the output in the
* ciphertext buffer.
*
* \retval #PSA_SUCCESS Success.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* ciphertext_size is too small.
* \retval #PSA_ERROR_CORRUPTION_DETECTED
*/
psa_status_t mbedtls_psa_aead_encrypt(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer, size_t key_buffer_size,
psa_algorithm_t alg,
const uint8_t *nonce, size_t nonce_length,
const uint8_t *additional_data, size_t additional_data_length,
const uint8_t *plaintext, size_t plaintext_length,
uint8_t *ciphertext, size_t ciphertext_size, size_t *ciphertext_length );
/**
* \brief Process an authenticated decryption operation.
*
* \note The signature of this function is that of a PSA driver
* aead_decrypt entry point. This function behaves as an aead_decrypt
* entry point as defined in the PSA driver interface specification for
* transparent drivers.
*
* \param[in] attributes The attributes of the key to use for the
* operation.
* \param[in] key_buffer The buffer containing the key context.
* \param key_buffer_size Size of the \p key_buffer buffer in bytes.
* \param alg The AEAD algorithm to compute.
* \param[in] nonce Nonce or IV to use.
* \param nonce_length Size of the nonce buffer in bytes. This must
* be appropriate for the selected algorithm.
* The default nonce size is
* PSA_AEAD_NONCE_LENGTH(key_type, alg) where
* key_type is the type of key.
* \param[in] additional_data Additional data that has been authenticated
* but not encrypted.
* \param additional_data_length Size of additional_data in bytes.
* \param[in] ciphertext Data that has been authenticated and
* encrypted. For algorithms where the encrypted
* data and the authentication tag are defined
* as separate inputs, the buffer contains
* encrypted data followed by the authentication
* tag.
* \param ciphertext_length Size of ciphertext in bytes.
* \param[out] plaintext Output buffer for the decrypted data.
* \param plaintext_size Size of the plaintext buffer in bytes. This
* must be appropriate for the selected algorithm
* and key:
* - A sufficient output size is
* PSA_AEAD_DECRYPT_OUTPUT_SIZE(key_type, alg,
* ciphertext_length) where key_type is the
* type of key.
* - PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE(
* ciphertext_length) evaluates to the maximum
* plaintext size of any supported AEAD
* decryption.
* \param[out] plaintext_length On success, the size of the output in the
* plaintext buffer.
*
* \retval #PSA_SUCCESS Success.
* \retval #PSA_ERROR_INVALID_SIGNATURE
* The cipher is not authentic.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* plaintext_size is too small.
* \retval #PSA_ERROR_CORRUPTION_DETECTED
*/
psa_status_t mbedtls_psa_aead_decrypt(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer, size_t key_buffer_size,
psa_algorithm_t alg,
const uint8_t *nonce, size_t nonce_length,
const uint8_t *additional_data, size_t additional_data_length,
const uint8_t *ciphertext, size_t ciphertext_length,
uint8_t *plaintext, size_t plaintext_size, size_t *plaintext_length );
#endif /* PSA_CRYPTO_AEAD */