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Change return type of AES decrypt and encrypt

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This patch modifies the following 2 functions in the AES module to
change the return type from void to int:
    * mbedtls_aes_encrypt() -> mbedtls_internal_aes_encrypt()
    * mbedtls_aes_decrypt() -> mbedtls_internal_aes_decrypt()
This change is necessary to allow users of MBEDTLS_AES_ALT,
MBEDTLS_AES_DECRYPT_ALT and MBEDTLS_AES_ENCRYPT_ALT to return an error
code when replacing the default with their own implementation, e.g.
a hardware crypto accelerator.
This commit is contained in:
Andres AG 2017-03-03 14:09:56 +00:00 • committed by Simon Butcher
parent 2850cdaed9
commit f5bf7189d3
3 changed files with 82 additions and 16 deletions
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22
library/aes.c
View file

@ -710,9 +710,9 @@ exit:
* AES-ECB block encryption
*/
#if !defined(MBEDTLS_AES_ENCRYPT_ALT)
void mbedtls_aes_encrypt( mbedtls_aes_context *ctx,
const unsigned char input[16],
unsigned char output[16] )
int mbedtls_internal_aes_encrypt( mbedtls_aes_context *ctx,
const unsigned char input[16],
unsigned char output[16] )
{
int i;
uint32_t *RK, X0, X1, X2, X3, Y0, Y1, Y2, Y3;
@ -760,6 +760,8 @@ void mbedtls_aes_encrypt( mbedtls_aes_context *ctx,
PUT_UINT32_LE( X1, output, 4 );
PUT_UINT32_LE( X2, output, 8 );
PUT_UINT32_LE( X3, output, 12 );
return( 0 );
}
#endif /* !MBEDTLS_AES_ENCRYPT_ALT */
@ -767,9 +769,9 @@ void mbedtls_aes_encrypt( mbedtls_aes_context *ctx,
* AES-ECB block decryption
*/
#if !defined(MBEDTLS_AES_DECRYPT_ALT)
void mbedtls_aes_decrypt( mbedtls_aes_context *ctx,
const unsigned char input[16],
unsigned char output[16] )
int mbedtls_internal_aes_decrypt( mbedtls_aes_context *ctx,
const unsigned char input[16],
unsigned char output[16] )
{
int i;
uint32_t *RK, X0, X1, X2, X3, Y0, Y1, Y2, Y3;
@ -817,6 +819,8 @@ void mbedtls_aes_decrypt( mbedtls_aes_context *ctx,
PUT_UINT32_LE( X1, output, 4 );
PUT_UINT32_LE( X2, output, 8 );
PUT_UINT32_LE( X3, output, 12 );
return( 0 );
}
#endif /* !MBEDTLS_AES_DECRYPT_ALT */
@ -846,11 +850,9 @@ int mbedtls_aes_crypt_ecb( mbedtls_aes_context *ctx,
#endif
if( mode == MBEDTLS_AES_ENCRYPT )
mbedtls_aes_encrypt( ctx, input, output );
return( mbedtls_internal_aes_encrypt( ctx, input, output ) );
else
mbedtls_aes_decrypt( ctx, input, output );
return( 0 );
return( mbedtls_internal_aes_decrypt( ctx, input, output ) );
}
#if defined(MBEDTLS_CIPHER_MODE_CBC)