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Factor out common code from ccm decrypt functions.

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Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
This commit is contained in:
Mateusz Starzyk 2021-07-28 15:21:46 +02:00
parent eb395c00c9
commit 1bda9451ef
1 changed files with 20 additions and 23 deletions
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43
library/ccm.c
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@ -558,16 +558,16 @@ static int mbedtls_ccm_compare_tags(const unsigned char *tag1, const unsigned ch
return( 0 );
}
int mbedtls_ccm_star_auth_decrypt( mbedtls_ccm_context *ctx, size_t length,
const unsigned char *iv, size_t iv_len,
const unsigned char *add, size_t add_len,
const unsigned char *input, unsigned char *output,
const unsigned char *tag, size_t tag_len )
static int ccm_auth_decrypt( mbedtls_ccm_context *ctx, int mode, size_t length,
const unsigned char *iv, size_t iv_len,
const unsigned char *add, size_t add_len,
const unsigned char *input, unsigned char *output,
const unsigned char *tag, size_t tag_len )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned char check_tag[16];
if( ( ret = ccm_auth_crypt( ctx, MBEDTLS_CCM_STAR_DECRYPT, length,
if( ( ret = ccm_auth_crypt( ctx, mode, length,
iv, iv_len, add, add_len,
input, output, check_tag, tag_len ) ) != 0 )
{
@ -583,29 +583,26 @@ int mbedtls_ccm_star_auth_decrypt( mbedtls_ccm_context *ctx, size_t length,
return( 0 );
}
int mbedtls_ccm_star_auth_decrypt( mbedtls_ccm_context *ctx, size_t length,
const unsigned char *iv, size_t iv_len,
const unsigned char *add, size_t add_len,
const unsigned char *input, unsigned char *output,
const unsigned char *tag, size_t tag_len )
{
return ccm_auth_decrypt( ctx, MBEDTLS_CCM_STAR_DECRYPT, length,
iv, iv_len, add, add_len,
input, output, tag, tag_len );
}
int mbedtls_ccm_auth_decrypt( mbedtls_ccm_context *ctx, size_t length,
const unsigned char *iv, size_t iv_len,
const unsigned char *add, size_t add_len,
const unsigned char *input, unsigned char *output,
const unsigned char *tag, size_t tag_len )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned char check_tag[16];
if( ( ret = ccm_auth_crypt( ctx, MBEDTLS_CCM_DECRYPT, length,
iv, iv_len, add, add_len,
input, output, check_tag, tag_len ) ) != 0 )
{
return( ret );
}
if( ( ret = mbedtls_ccm_compare_tags( tag, check_tag, tag_len ) ) != 0 )
{
mbedtls_platform_zeroize( output, length );
return( ret );
}
return( 0 );
return ccm_auth_decrypt( ctx, MBEDTLS_CCM_DECRYPT, length,
iv, iv_len, add, add_len,
input, output, tag, tag_len );
}
#endif /* !MBEDTLS_CCM_ALT */