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CCM*: Implement variable tag length

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This commit is contained in:
Janos Follath 2018-05-14 16:40:28 +01:00
parent c4e14e1ff5
commit 4023535425
1 changed files with 38 additions and 0 deletions
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38
library/ccm.c
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@ -335,6 +335,24 @@ int mbedtls_ccm_encrypt_and_tag( mbedtls_ccm_context *ctx, size_t length,
add_len, input, output, tag, tag_len ) );
}
#define CCM_MAX_IV_LEN 13
int mbedtls_ccm_svar_encrypt_and_tag( mbedtls_ccm_context *ctx, size_t length,
size_t iv_len, const unsigned char *add,
size_t add_len, const unsigned char *input,
unsigned char *output, unsigned char *tag,
size_t tag_len, mbedtls_ccm_star_get_iv_t get_iv,
void *get_iv_ctx )
{
unsigned char iv[CCM_MAX_IV_LEN];
if( get_iv( get_iv_ctx, tag_len, iv, iv_len ) != 0 )
return MBEDTLS_ERR_CCM_BAD_INPUT;
return( mbedtls_ccm_sfix_encrypt_and_tag( ctx, length, iv, iv_len, add,
add_len, input, output, tag, tag_len ) );
}
/*
* Authenticated decryption
*/
@ -381,6 +399,26 @@ int mbedtls_ccm_auth_decrypt( mbedtls_ccm_context *ctx, size_t length,
return( mbedtls_ccm_sfix_auth_decrypt( ctx, length, iv, iv_len, add,
add_len, input, output, tag, tag_len ) );
}
int mbedtls_ccm_svar_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,
size_t* output_len,
mbedtls_ccm_star_get_tag_len_t get_tag_len,
void *get_tlen_ctx )
{
size_t tag_len = 0;
if( get_tag_len( get_tlen_ctx, &tag_len, iv, iv_len ) != 0 )
return( MBEDTLS_ERR_CCM_BAD_INPUT );
*output_len = length - tag_len;
return( mbedtls_ccm_sfix_auth_decrypt( ctx, length, iv, iv_len, add,
add_len, input, output, input + length, tag_len ) );
}
#endif /* !MBEDTLS_CCM_ALT */
#if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)