mirrors/tor
1
0
Fork 0
mirror of https://gitlab.torproject.org/tpo/core/tor.git synced 2025-02-24 14:51:11 +01:00
Code Issues Projects Releases Wiki Activity

Add the randomized large buffer test for SHA-3 incremental hashing.

Browse source 
This creates a random 100 KiB buffer, and incrementally hashes
(SHA3-512) between 1 and 5 * Rate bytes in a loop, comparing the running
digest with the equivalent one shot call from the start of the buffer.
This commit is contained in:
Yawning Angel 2015-12-20 07:11:20 +00:00
parent 9467485517
commit 081b159abc
1 changed files with 35 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

35
src/test/test_crypto.c
View file

@ -456,6 +456,7 @@ test_crypto_sha3(void *arg)
char data[DIGEST512_LEN];
char d_out1[DIGEST512_LEN], d_out2[DIGEST512_LEN];
char *mem_op_hex_tmp=NULL;
char *large = NULL;
(void)arg;
@ -712,12 +713,46 @@ test_crypto_sha3(void *arg)
crypto_digest_get_digest(d1, d_out1, DIGEST512_LEN);
crypto_digest512(d_out2, "abcdef", 6, DIGEST_SHA3_512);
tt_mem_op(d_out1,OP_EQ, d_out2, DIGEST512_LEN);
crypto_digest_free(d1);
/* Attempt to exercise the incremental hashing code by creating a randomized
* 100 KiB buffer, and hashing rand[1, 5 * Rate] bytes at a time. SHA3-512
* is used because it has a lowest rate of the family (the code is common,
* but the slower rate exercises more of it).
*/
const size_t bufsz = 100 * 1024;
size_t j = 0;
large = tor_malloc(bufsz);
crypto_rand(large, bufsz);
d1 = crypto_digest512_new(DIGEST_SHA3_512); /* Running digest. */
while (j < bufsz) {
/* Pick how much data to add to the running digest. */
size_t incr = (size_t)crypto_rand_int_range(1, 72 * 5);
incr = MIN(bufsz - j, incr);
/* Add the data, and calculate the hash. */
crypto_digest_add_bytes(d1, large + j, incr);
crypto_digest_get_digest(d1, d_out1, DIGEST512_LEN);
/* One-shot hash the buffer up to the data that was just added,
* and ensure that the values match up.
*
* XXX/yawning: If this actually fails, it'll be rather difficult to
* reproduce. Improvements welcome.
*/
i = crypto_digest512(d_out2, large, j + incr, DIGEST_SHA3_512);
tt_int_op(i, OP_EQ, 0);
tt_mem_op(d_out1, OP_EQ, d_out2, DIGEST512_LEN);
j += incr;
}
done:
if (d1)
crypto_digest_free(d1);
if (d2)
crypto_digest_free(d2);
tor_free(large);
tor_free(mem_op_hex_tmp);
}