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psa: cipher: Dispatch based on driver identifier

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For cipher multi-part operations, dispatch based on
the driver identifier even in the case of the
Mbed TLS software implementation (viewed as a driver).
Also use the driver identifier to check that an
cipher operation context is active or not.

This aligns the way hash and cipher multi-part
operations are dispatched.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit is contained in:
Ronald Cron 2021-03-10 08:34:23 +01:00
parent 06aa442bef
commit 49fafa98b1
4 changed files with 88 additions and 99 deletions
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14
include/psa/crypto_struct.h
View file

@ -73,11 +73,6 @@ extern "C" {
#include "psa/crypto_driver_contexts.h"
typedef struct {
/** Unique ID indicating which driver got assigned to do the
* operation. Since driver contexts are driver-specific, swapping
* drivers halfway through the operation is not supported.
* ID values are auto-generated in psa_driver_wrappers.h */
unsigned int id;
/** Context structure for the assigned driver, when id is not zero. */
void* ctx;
} psa_operation_driver_context_t;
@ -143,10 +138,17 @@ static inline struct psa_mac_operation_s psa_mac_operation_init( void )
struct psa_cipher_operation_s
{
/** Unique ID indicating which driver got assigned to do the
* operation. Since driver contexts are driver-specific, swapping
* drivers halfway through the operation is not supported.
* ID values are auto-generated in psa_crypto_driver_wrappers.h
* ID value zero means the context is not valid or not assigned to
* any driver (i.e. none of the driver contexts are active). */
unsigned int id;
psa_algorithm_t alg;
unsigned int iv_required : 1;
unsigned int iv_set : 1;
unsigned int mbedtls_in_use : 1; /* Indicates mbed TLS is handling the operation. */
uint8_t iv_size;
uint8_t block_size;
union

28
library/psa_crypto.c
View file

@ -3393,7 +3393,7 @@ static psa_status_t psa_cipher_setup( psa_cipher_operation_t *operation,
PSA_KEY_USAGE_DECRYPT );
/* A context must be freshly initialized before it can be set up. */
if( operation->alg != 0 )
if( operation->id != 0 )
return( PSA_ERROR_BAD_STATE );
/* The requested algorithm must be one that can be processed by cipher. */
@ -3405,11 +3405,12 @@ static psa_status_t psa_cipher_setup( psa_cipher_operation_t *operation,
if( status != PSA_SUCCESS )
goto exit;
/* Initialize the operation struct members, except for alg. The alg member
/* Initialize the operation struct members, except for id. The id member
* is used to indicate to psa_cipher_abort that there are resources to free,
* so we only set it after resources have been allocated/initialized. */
* so we only set it (in the driver wrapper) after resources have been
* allocated/initialized. */
operation->alg = alg;
operation->iv_set = 0;
operation->mbedtls_in_use = 0;
operation->iv_size = 0;
operation->block_size = 0;
if( alg == PSA_ALG_ECB_NO_PADDING )
@ -3435,13 +3436,6 @@ static psa_status_t psa_cipher_setup( psa_cipher_operation_t *operation,
slot->key.bytes,
alg );
if( status == PSA_SUCCESS )
{
/* Once the driver context is initialized, it needs to be freed using
* psa_cipher_abort. Indicate this through setting alg. */
operation->alg = alg;
}
exit:
if( status != PSA_SUCCESS )
psa_cipher_abort( operation );
@ -3472,7 +3466,7 @@ psa_status_t psa_cipher_generate_iv( psa_cipher_operation_t *operation,
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
if( operation->alg == 0 )
if( operation->id == 0 )
{
return( PSA_ERROR_BAD_STATE );
}
@ -3501,7 +3495,7 @@ psa_status_t psa_cipher_set_iv( psa_cipher_operation_t *operation,
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
if( operation->alg == 0 )
if( operation->id == 0 )
{
return( PSA_ERROR_BAD_STATE );
}
@ -3531,7 +3525,7 @@ psa_status_t psa_cipher_update( psa_cipher_operation_t *operation,
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
if( operation->alg == 0 )
if( operation->id == 0 )
{
return( PSA_ERROR_BAD_STATE );
}
@ -3559,7 +3553,7 @@ psa_status_t psa_cipher_finish( psa_cipher_operation_t *operation,
{
psa_status_t status = PSA_ERROR_GENERIC_ERROR;
if( operation->alg == 0 )
if( operation->id == 0 )
{
return( PSA_ERROR_BAD_STATE );
}
@ -3585,7 +3579,7 @@ psa_status_t psa_cipher_finish( psa_cipher_operation_t *operation,
psa_status_t psa_cipher_abort( psa_cipher_operation_t *operation )
{
if( operation->alg == 0 )
if( operation->id == 0 )
{
/* The object has (apparently) been initialized but it is not (yet)
* in use. It's ok to call abort on such an object, and there's
@ -3600,9 +3594,9 @@ psa_status_t psa_cipher_abort( psa_cipher_operation_t *operation )
psa_driver_wrapper_cipher_abort( operation );
operation->id = 0;
operation->alg = 0;
operation->iv_set = 0;
operation->mbedtls_in_use = 0;
operation->iv_size = 0;
operation->block_size = 0;
operation->iv_required = 0;

6
library/psa_crypto_cipher.c
View file

@ -49,13 +49,7 @@ static psa_status_t cipher_setup(
* available for the given algorithm & key. */
mbedtls_cipher_init( &operation->ctx.cipher );
/* Once the cipher context is initialised, it needs to be freed using
* psa_cipher_abort. Indicate there is something to be freed through setting
* alg, and indicate the operation is being done using mbedtls crypto through
* setting mbedtls_in_use. */
operation->alg = alg;
operation->mbedtls_in_use = 1;
key_bits = attributes->core.bits;
cipher_info = mbedtls_cipher_info_from_psa( alg, key_type,
key_bits, NULL );

139
library/psa_crypto_driver_wrappers.c
View file

@ -741,8 +741,7 @@ psa_status_t psa_driver_wrapper_cipher_encrypt_setup(
/* Declared with fallback == true */
if( status == PSA_SUCCESS )
{
operation->ctx.driver.id =
PSA_CRYPTO_TRANSPARENT_TEST_DRIVER_ID;
operation->id = PSA_CRYPTO_TRANSPARENT_TEST_DRIVER_ID;
operation->ctx.driver.ctx = driver_ctx;
}
else
@ -757,11 +756,15 @@ psa_status_t psa_driver_wrapper_cipher_encrypt_setup(
#endif /* PSA_CRYPTO_DRIVER_TEST */
#endif /* PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT */
/* Fell through, meaning no accelerator supports this operation */
return( mbedtls_psa_cipher_encrypt_setup( operation,
attributes,
key_buffer,
key_buffer_size,
alg ) );
status = mbedtls_psa_cipher_encrypt_setup( operation,
attributes,
key_buffer,
key_buffer_size,
alg );
if( status == PSA_SUCCESS )
operation->id = PSA_CRYPTO_MBED_TLS_DRIVER_ID;
return( status );
/* Add cases for opaque driver here */
#if defined(PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT)
@ -779,7 +782,7 @@ psa_status_t psa_driver_wrapper_cipher_encrypt_setup(
alg );
if( status == PSA_SUCCESS )
{
operation->ctx.driver.id = PSA_CRYPTO_OPAQUE_TEST_DRIVER_ID;
operation->id = PSA_CRYPTO_OPAQUE_TEST_DRIVER_ID;
operation->ctx.driver.ctx = driver_ctx;
}
else
@ -831,8 +834,7 @@ psa_status_t psa_driver_wrapper_cipher_decrypt_setup(
/* Declared with fallback == true */
if( status == PSA_SUCCESS )
{
operation->ctx.driver.id =
PSA_CRYPTO_TRANSPARENT_TEST_DRIVER_ID;
operation->id = PSA_CRYPTO_TRANSPARENT_TEST_DRIVER_ID;
operation->ctx.driver.ctx = driver_ctx;
}
else
@ -847,11 +849,16 @@ psa_status_t psa_driver_wrapper_cipher_decrypt_setup(
#endif /* PSA_CRYPTO_DRIVER_TEST */
#endif /* PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT */
/* Fell through, meaning no accelerator supports this operation */
return( mbedtls_psa_cipher_decrypt_setup( operation,
attributes,
key_buffer,
key_buffer_size,
alg ) );
status = mbedtls_psa_cipher_decrypt_setup( operation,
attributes,
key_buffer,
key_buffer_size,
alg );
if( status == PSA_SUCCESS )
operation->id = PSA_CRYPTO_MBED_TLS_DRIVER_ID;
return( status );
/* Add cases for opaque driver here */
#if defined(PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT)
#if defined(PSA_CRYPTO_DRIVER_TEST)
@ -868,7 +875,7 @@ psa_status_t psa_driver_wrapper_cipher_decrypt_setup(
alg );
if( status == PSA_SUCCESS )
{
operation->ctx.driver.id = PSA_CRYPTO_OPAQUE_TEST_DRIVER_ID;
operation->id = PSA_CRYPTO_OPAQUE_TEST_DRIVER_ID;
operation->ctx.driver.ctx = driver_ctx;
}
else
@ -895,15 +902,14 @@ psa_status_t psa_driver_wrapper_cipher_generate_iv(
size_t iv_size,
size_t *iv_length )
{
if( operation->mbedtls_in_use )
return( mbedtls_psa_cipher_generate_iv( operation,
iv,
iv_size,
iv_length ) );
#if defined(PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT)
switch( operation->ctx.driver.id )
switch( operation->id )
{
case PSA_CRYPTO_MBED_TLS_DRIVER_ID:
return( mbedtls_psa_cipher_generate_iv( operation,
iv,
iv_size,
iv_length ) );
#if defined(PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT)
#if defined(PSA_CRYPTO_DRIVER_TEST)
case PSA_CRYPTO_TRANSPARENT_TEST_DRIVER_ID:
return( test_transparent_cipher_generate_iv(
@ -911,9 +917,7 @@ psa_status_t psa_driver_wrapper_cipher_generate_iv(
iv,
iv_size,
iv_length ) );
#endif /* PSA_CRYPTO_DRIVER_TEST */
#if defined(PSA_CRYPTO_DRIVER_TEST)
case PSA_CRYPTO_OPAQUE_TEST_DRIVER_ID:
return( test_opaque_cipher_generate_iv(
operation->ctx.driver.ctx,
@ -921,8 +925,8 @@ psa_status_t psa_driver_wrapper_cipher_generate_iv(
iv_size,
iv_length ) );
#endif /* PSA_CRYPTO_DRIVER_TEST */
}
#endif /* PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT */
}
return( PSA_ERROR_INVALID_ARGUMENT );
}
@ -932,28 +936,27 @@ psa_status_t psa_driver_wrapper_cipher_set_iv(
const uint8_t *iv,
size_t iv_length )
{
if( operation->mbedtls_in_use )
return( mbedtls_psa_cipher_set_iv( operation,
iv,
iv_length ) );
switch( operation->id )
{
case PSA_CRYPTO_MBED_TLS_DRIVER_ID:
return( mbedtls_psa_cipher_set_iv( operation,
iv,
iv_length ) );
#if defined(PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT)
switch( operation->ctx.driver.id )
{
#if defined(PSA_CRYPTO_DRIVER_TEST)
case PSA_CRYPTO_TRANSPARENT_TEST_DRIVER_ID:
return( test_transparent_cipher_set_iv( operation->ctx.driver.ctx,
iv,
iv_length ) );
#endif /* PSA_CRYPTO_DRIVER_TEST */
#if defined(PSA_CRYPTO_DRIVER_TEST)
case PSA_CRYPTO_OPAQUE_TEST_DRIVER_ID:
return( test_opaque_cipher_set_iv( operation->ctx.driver.ctx,
iv,
iv_length ) );
#endif /* PSA_CRYPTO_DRIVER_TEST */
}
#endif /* PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT */
}
return( PSA_ERROR_INVALID_ARGUMENT );
}
@ -966,17 +969,16 @@ psa_status_t psa_driver_wrapper_cipher_update(
size_t output_size,
size_t *output_length )
{
if( operation->mbedtls_in_use )
return( mbedtls_psa_cipher_update( operation,
input,
input_length,
output,
output_size,
output_length ) );
#if defined(PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT)
switch( operation->ctx.driver.id )
switch( operation->id )
{
case PSA_CRYPTO_MBED_TLS_DRIVER_ID:
return( mbedtls_psa_cipher_update( operation,
input,
input_length,
output,
output_size,
output_length ) );
#if defined(PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT)
#if defined(PSA_CRYPTO_DRIVER_TEST)
case PSA_CRYPTO_TRANSPARENT_TEST_DRIVER_ID:
return( test_transparent_cipher_update( operation->ctx.driver.ctx,
@ -985,8 +987,6 @@ psa_status_t psa_driver_wrapper_cipher_update(
output,
output_size,
output_length ) );
#endif /* PSA_CRYPTO_DRIVER_TEST */
#if defined(PSA_CRYPTO_DRIVER_TEST)
case PSA_CRYPTO_OPAQUE_TEST_DRIVER_ID:
return( test_opaque_cipher_update( operation->ctx.driver.ctx,
input,
@ -995,8 +995,8 @@ psa_status_t psa_driver_wrapper_cipher_update(
output_size,
output_length ) );
#endif /* PSA_CRYPTO_DRIVER_TEST */
}
#endif /* PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT */
}
return( PSA_ERROR_INVALID_ARGUMENT );
}
@ -1007,31 +1007,31 @@ psa_status_t psa_driver_wrapper_cipher_finish(
size_t output_size,
size_t *output_length )
{
if( operation->mbedtls_in_use )
return( mbedtls_psa_cipher_finish( operation,
output,
output_size,
output_length ) );
switch( operation->id )
{
case PSA_CRYPTO_MBED_TLS_DRIVER_ID:
return( mbedtls_psa_cipher_finish( operation,
output,
output_size,
output_length ) );
#if defined(PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT)
switch( operation->ctx.driver.id )
{
#if defined(PSA_CRYPTO_DRIVER_TEST)
case PSA_CRYPTO_TRANSPARENT_TEST_DRIVER_ID:
return( test_transparent_cipher_finish( operation->ctx.driver.ctx,
output,
output_size,
output_length ) );
#endif /* PSA_CRYPTO_DRIVER_TEST */
#if defined(PSA_CRYPTO_DRIVER_TEST)
case PSA_CRYPTO_OPAQUE_TEST_DRIVER_ID:
return( test_opaque_cipher_finish( operation->ctx.driver.ctx,
output,
output_size,
output_length ) );
#endif /* PSA_CRYPTO_DRIVER_TEST */
}
#endif /* PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT */
}
return( PSA_ERROR_INVALID_ARGUMENT );
}
@ -1039,20 +1039,21 @@ psa_status_t psa_driver_wrapper_cipher_finish(
psa_status_t psa_driver_wrapper_cipher_abort(
psa_cipher_operation_t *operation )
{
if( operation->mbedtls_in_use )
return( mbedtls_psa_cipher_abort( operation ) );
#if defined(PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT)
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
psa_operation_driver_context_t *driver_context = &operation->ctx.driver;
/* The object has (apparently) been initialized but it is not in use. It's
* ok to call abort on such an object, and there's nothing to do. */
if( driver_context->ctx == NULL && driver_context->id == 0 )
if( ( operation->id != PSA_CRYPTO_MBED_TLS_DRIVER_ID ) &&
( driver_context->ctx == NULL ) )
return( PSA_SUCCESS );
switch( driver_context->id )
switch( operation->id )
{
case PSA_CRYPTO_MBED_TLS_DRIVER_ID:
return( mbedtls_psa_cipher_abort( operation ) );
#if defined(PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT)
#if defined(PSA_CRYPTO_DRIVER_TEST)
case PSA_CRYPTO_TRANSPARENT_TEST_DRIVER_ID:
status = test_transparent_cipher_abort( driver_context->ctx );
@ -1061,11 +1062,9 @@ psa_status_t psa_driver_wrapper_cipher_abort(
sizeof( test_transparent_cipher_operation_t ) );
mbedtls_free( driver_context->ctx );
driver_context->ctx = NULL;
driver_context->id = 0;
return( status );
#endif /* PSA_CRYPTO_DRIVER_TEST */
#if defined(PSA_CRYPTO_DRIVER_TEST)
case PSA_CRYPTO_OPAQUE_TEST_DRIVER_ID:
status = test_opaque_cipher_abort( driver_context->ctx );
mbedtls_platform_zeroize(
@ -1073,13 +1072,13 @@ psa_status_t psa_driver_wrapper_cipher_abort(
sizeof( test_opaque_cipher_operation_t ) );
mbedtls_free( driver_context->ctx );
driver_context->ctx = NULL;
driver_context->id = 0;
return( status );
#endif /* PSA_CRYPTO_DRIVER_TEST */
}
#endif /* PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT */
}
(void)status;
return( PSA_ERROR_INVALID_ARGUMENT );
}