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/*
* cifra - embedded cryptography library
* Written in 2014 by Joseph Birr-Pixton <jpixton@gmail.com>
*
* To the extent possible under law, the author(s) have dedicated all
* copyright and related and neighboring rights to this software to the
* public domain worldwide. This software is distributed without any
* warranty.
*
* You should have received a copy of the CC0 Public Domain Dedication
* along with this software. If not, see
* <http://creativecommons.org/publicdomain/zero/1.0/>.
*/
#ifndef TESTSHA_H
#define TESTSHA_H
#include "hmac.h"
/* Common functions for testing hash functions.
* You shouldn't use this file. */
static void vector(const cf_chash *hash,
const void *vmsg, size_t nmsg,
const char *expect, size_t nexpect)
{
uint8_t digest[CF_MAXHASH];
const uint8_t *msg = vmsg;
size_t orig_nmsg = nmsg;
cf_chash_ctx ctx;
hash->init(&ctx);
/* Input in carefully chosen chunk sizes to exercise blockwise code. */
if (nmsg)
{
hash->update(&ctx, msg, 1);
nmsg--;
msg++;
}
hash->update(&ctx, msg, nmsg);
hash->digest(&ctx, digest);
TEST_CHECK(nexpect == hash->hashsz);
TEST_CHECK(memcmp(digest, expect, nexpect) == 0);
/* Now try with other arrangements. */
msg = vmsg;
nmsg = orig_nmsg;
hash->init(&ctx);
if (nmsg >= hash->blocksz)
{
hash->update(&ctx, msg, hash->blocksz - 1);
nmsg -= hash->blocksz - 1;
msg += hash->blocksz - 1;
}
hash->update(&ctx, msg, nmsg);
hash->digest(&ctx, digest);
TEST_CHECK(memcmp(digest, expect, nexpect) == 0);
}
/* These are shared between RFC2202 and RFC4231. */
static inline void hmac_test(const cf_chash *hash,
const void *hi_there,
const void *jefe,
const void *aa_dd,
const void *counter_key)
{
uint8_t sig[CF_MAXHASH];
uint8_t key[25], message[50];
/* Key: 0x0b * 20
* Message: "Hi There"
*/
memset(key, 0x0b, 20);
memcpy(message, "Hi There", 8);
cf_hmac(key, 20, message, 8, sig, hash);
TEST_CHECK(memcmp(sig, hi_there, hash->hashsz) == 0);
/* Key: "Jefe"
* Message: "what do ya want for nothing?"
*/
memcpy(key, "Jefe", 4);
memcpy(message, "what do ya want for nothing?", 28);
cf_hmac(key, 4, message, 28, sig, hash);
TEST_CHECK(memcmp(sig, jefe, hash->hashsz) == 0);
/* Key: 0xaa * 20
* Message: 0xdd * 50
*/
memset(key, 0xaa, 20);
memset(message, 0xdd, 50);
cf_hmac(key, 20, message, 50, sig, hash);
TEST_CHECK(memcmp(sig, aa_dd, hash->hashsz) == 0);
/* Key: 0x01..0x19
* Message: 0xcd * 50
*/
for (uint8_t i = 1; i < 26; i++)
key[i - 1] = i;
memset(message, 0xcd, 50);
cf_hmac(key, 25, message, 50, sig, hash);
TEST_CHECK(memcmp(sig, counter_key, hash->hashsz) == 0);
}
/* These are specific to RFC4231. */
static inline void hmac_test_sha2(const cf_chash *hash,
const char *long_key,
const char *long_message)
{
uint8_t sig[CF_MAXHASH];
uint8_t key[131], message[152];
/* Key: 0xaa * 131
* Message: "Test Using Larger Than Block-Size Key - Hash Key First"
*/
memset(key, 0xaa, 131);
memcpy(message, "Test Using Larger Than Block-Size Key - Hash Key First", 54);
cf_hmac(key, 131, message, 54, sig, hash);
TEST_CHECK(memcmp(sig, long_key, hash->hashsz) == 0);
/* Key: 0xaa * 131
* Message: "This is a test using a larger than block-size key and a larger than block-size data. The key needs to be hashed before being used by the HMAC algorithm."
*/
memset(key, 0xaa, 131);
memcpy(message, "This is a test using a larger than block-size key and a larger than block-size data. The key needs to be hashed before being used by the HMAC algorithm.", 152);
cf_hmac(key, 131, message, 152, sig, hash);
TEST_CHECK(memcmp(sig, long_message, hash->hashsz) == 0);
}
/* This is as hmac_test_sha2, except the sizes are specific to
* a 512-bit block. This is from RFC2202. */
static inline void hmac_test_sha1(const cf_chash *hash,
const char *long_key,
const char *long_message)
{
uint8_t sig[CF_MAXHASH];
uint8_t key[80], message[73];
/* Key: 0xaa * 80
* Message: "Test Using Larger Than Block-Size Key - Hash Key First"
*/
memset(key, 0xaa, 80);
memcpy(message, "Test Using Larger Than Block-Size Key - Hash Key First", 54);
cf_hmac(key, 80, message, 54, sig, hash);
TEST_CHECK(memcmp(sig, long_key, hash->hashsz) == 0);
/* Key: 0xaa * 80
* Message: "Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data"
*/
memset(key, 0xaa, 80);
memcpy(message, "Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data", 73);
cf_hmac(key, 80, message, 73, sig, hash);
TEST_CHECK(memcmp(sig, long_message, hash->hashsz) == 0);
}
typedef void (*final_fn)(void *ctx, uint8_t *out);
/* Check incremental interface works, and final function likewise. */
static void vector_abc_final(const cf_chash *hash, const void *vfinal_fn,
const void *expect, size_t nexpect)
{
uint8_t digest[CF_MAXHASH];
final_fn final = vfinal_fn;
cf_chash_ctx ctx;
hash->init(&ctx);
hash->update(&ctx, "a", 1);
hash->digest(&ctx, digest);
hash->update(&ctx, "b", 1);
hash->digest(&ctx, digest);
hash->update(&ctx, "c", 1);
final(&ctx, digest);
TEST_CHECK(hash->hashsz == nexpect);
TEST_CHECK(memcmp(expect, digest, nexpect) == 0);
}
/* Check length-checking vectors work (generated by programs in ../extra_vecs) */
static inline void vector_length(const cf_chash *h,
size_t max,
const void *expect, size_t nexpect)
{
cf_chash_ctx outer, inner;
uint8_t digest[CF_MAXHASH];
h->init(&outer);
for (size_t n = 0; n < max; n++)
{
h->init(&inner);
for (size_t i = 0; i < n; i++)
{
uint8_t byte = (uint8_t) n & 0xff;
h->update(&inner, &byte, 1);
}
h->digest(&inner, digest);
h->update(&outer, digest, h->hashsz);
}
h->digest(&outer, digest);
TEST_CHECK(h->hashsz == nexpect);
TEST_CHECK(memcmp(expect, digest, nexpect) == 0);
}
#endif
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