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icecast-server/src/digest.c

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/* Icecast
*
* This program is distributed under the GNU General Public License, version 2.
* A copy of this license is included with this source.
*
* Copyright 2020, Philipp "ph3-der-loewe" Schafft <lion@lion.leolix.org>
*
* The SHA3 implementation is based on rhash:
* 2013 by Aleksey Kravchenko <rhash.admin@gmail.com>
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <string.h>
#include <stdlib.h>
#include "digest.h"
#include "md5.h"
#include "logging.h"
#define CATMODULE "digest"
struct digest_tag {
/* base object */
refobject_base_t __base;
/* metadata */
digest_algo_t algo;
/* state */
int done;
union {
struct MD5Context md5;
struct {
/* 1600 bits algorithm hashing state */
uint64_t hash[25];
/* 1536-bit buffer for leftovers */
char message[24*8];
/* count of bytes in the message[] buffer */
size_t rest;
/* size of a message block processed at once */
size_t block_size;
} sha3;
} state;
};
struct hmac_tag {
/* base object */
refobject_base_t __base;
digest_algo_t algo;
char *key;
size_t key_len;
digest_t * inner;
};
static void __hmac_free(refobject_t self, void **userdata)
{
hmac_t *hmac = REFOBJECT_TO_TYPE(self, hmac_t *);
free(hmac->key);
refobject_unref(hmac->inner);
}
REFOBJECT_DEFINE_TYPE(digest_t);
REFOBJECT_DEFINE_TYPE(hmac_t,
REFOBJECT_DEFINE_TYPE_FREE(__hmac_free)
);
#define ROTL64(qword, n) ((qword) << (n) ^ ((qword) >> (64 - (n))))
#ifdef WORDS_BIGENDIAN
// TODO: Improve this.
static inline uint64_t digest_letoh64(uint64_t x)
{
union {
uint64_t num;
char b[8];
} in, out;
int i;
in.num = x;
for (i = 0; i < 8; i++)
out.b[i] = in.b[7 - i];
return out.num;
}
#else
#define digest_letoh64(x) (x)
#endif
/* SHA3 (Keccak) constants for 24 rounds */
static uint64_t keccak_round_constants[] = {
0x0000000000000001ULL, 0x0000000000008082ULL, 0x800000000000808AULL, 0x8000000080008000ULL,
0x000000000000808BULL, 0x0000000080000001ULL, 0x8000000080008081ULL, 0x8000000000008009ULL,
0x000000000000008AULL, 0x0000000000000088ULL, 0x0000000080008009ULL, 0x000000008000000AULL,
0x000000008000808BULL, 0x800000000000008BULL, 0x8000000000008089ULL, 0x8000000000008003ULL,
0x8000000000008002ULL, 0x8000000000000080ULL, 0x000000000000800AULL, 0x800000008000000AULL,
0x8000000080008081ULL, 0x8000000000008080ULL, 0x0000000080000001ULL, 0x8000000080008008ULL
};
static inline void sha3_init(digest_t *digest, unsigned int bits)
{
/* The Keccak capacity parameter = bits * 2 */
unsigned int rate = 1600 - bits * 2;
digest->state.sha3.block_size = rate / 8;
}
#define XORED_A(i) A[(i)] ^ A[(i) + 5] ^ A[(i) + 10] ^ A[(i) + 15] ^ A[(i) + 20]
#define THETA_STEP(i) \
A[(i)] ^= D[(i)]; \
A[(i) + 5] ^= D[(i)]; \
A[(i) + 10] ^= D[(i)]; \
A[(i) + 15] ^= D[(i)]; \
A[(i) + 20] ^= D[(i)]
/* Keccak theta() transformation */
static inline void keccak_theta(uint64_t *A)
{
uint64_t D[5];
D[0] = ROTL64(XORED_A(1), 1) ^ XORED_A(4);
D[1] = ROTL64(XORED_A(2), 1) ^ XORED_A(0);
D[2] = ROTL64(XORED_A(3), 1) ^ XORED_A(1);
D[3] = ROTL64(XORED_A(4), 1) ^ XORED_A(2);
D[4] = ROTL64(XORED_A(0), 1) ^ XORED_A(3);
THETA_STEP(0);
THETA_STEP(1);
THETA_STEP(2);
THETA_STEP(3);
THETA_STEP(4);
}
/* Keccak pi() transformation */
static inline void keccak_pi(uint64_t *A)
{
uint64_t A1;
A1 = A[1];
A[ 1] = A[ 6];
A[ 6] = A[ 9];
A[ 9] = A[22];
A[22] = A[14];
A[14] = A[20];
A[20] = A[ 2];
A[ 2] = A[12];
A[12] = A[13];
A[13] = A[19];
A[19] = A[23];
A[23] = A[15];
A[15] = A[ 4];
A[ 4] = A[24];
A[24] = A[21];
A[21] = A[ 8];
A[ 8] = A[16];
A[16] = A[ 5];
A[ 5] = A[ 3];
A[ 3] = A[18];
A[18] = A[17];
A[17] = A[11];
A[11] = A[ 7];
A[ 7] = A[10];
A[10] = A1;
/* note: A[ 0] is left as is */
}
#define CHI_STEP(i) \
A0 = A[0 + (i)]; \
A1 = A[1 + (i)]; \
A[0 + (i)] ^= ~A1 & A[2 + (i)]; \
A[1 + (i)] ^= ~A[2 + (i)] & A[3 + (i)]; \
A[2 + (i)] ^= ~A[3 + (i)] & A[4 + (i)]; \
A[3 + (i)] ^= ~A[4 + (i)] & A0; \
A[4 + (i)] ^= ~A0 & A1
/* Keccak chi() transformation */
static inline void keccak_chi(uint64_t *A)
{
uint64_t A0, A1;
CHI_STEP(0);
CHI_STEP(5);
CHI_STEP(10);
CHI_STEP(15);
CHI_STEP(20);
}
/**
* The core transformation. Process the specified block of data.
*
* @param hash the algorithm state
* @param block the message block to process
* @param block_size the size of the processed block in bytes
*/
static inline void sha3_process_block(uint64_t hash[25], const uint64_t *block, size_t block_size)
{
size_t round;
/* expanded loop */
hash[ 0] ^= digest_letoh64(block[ 0]);
hash[ 1] ^= digest_letoh64(block[ 1]);
hash[ 2] ^= digest_letoh64(block[ 2]);
hash[ 3] ^= digest_letoh64(block[ 3]);
hash[ 4] ^= digest_letoh64(block[ 4]);
hash[ 5] ^= digest_letoh64(block[ 5]);
hash[ 6] ^= digest_letoh64(block[ 6]);
hash[ 7] ^= digest_letoh64(block[ 7]);
hash[ 8] ^= digest_letoh64(block[ 8]);
/* if not sha3-512 */
if (block_size > 72) {
hash[ 9] ^= digest_letoh64(block[ 9]);
hash[10] ^= digest_letoh64(block[10]);
hash[11] ^= digest_letoh64(block[11]);
hash[12] ^= digest_letoh64(block[12]);
/* if not sha3-384 */
if (block_size > 104) {
hash[13] ^= digest_letoh64(block[13]);
hash[14] ^= digest_letoh64(block[14]);
hash[15] ^= digest_letoh64(block[15]);
hash[16] ^= digest_letoh64(block[16]);
/* if not sha3-256 */
if (block_size > 136) {
hash[17] ^= digest_letoh64(block[17]);
}
}
}
/* make a permutation of the hash */
for (round = 0; round < (sizeof(keccak_round_constants)/sizeof(*keccak_round_constants)); round++) {
keccak_theta(hash);
/* apply Keccak rho() transformation */
hash[ 1] = ROTL64(hash[ 1], 1);
hash[ 2] = ROTL64(hash[ 2], 62);
hash[ 3] = ROTL64(hash[ 3], 28);
hash[ 4] = ROTL64(hash[ 4], 27);
hash[ 5] = ROTL64(hash[ 5], 36);
hash[ 6] = ROTL64(hash[ 6], 44);
hash[ 7] = ROTL64(hash[ 7], 6);
hash[ 8] = ROTL64(hash[ 8], 55);
hash[ 9] = ROTL64(hash[ 9], 20);
hash[10] = ROTL64(hash[10], 3);
hash[11] = ROTL64(hash[11], 10);
hash[12] = ROTL64(hash[12], 43);
hash[13] = ROTL64(hash[13], 25);
hash[14] = ROTL64(hash[14], 39);
hash[15] = ROTL64(hash[15], 41);
hash[16] = ROTL64(hash[16], 45);
hash[17] = ROTL64(hash[17], 15);
hash[18] = ROTL64(hash[18], 21);
hash[19] = ROTL64(hash[19], 8);
hash[20] = ROTL64(hash[20], 18);
hash[21] = ROTL64(hash[21], 2);
hash[22] = ROTL64(hash[22], 61);
hash[23] = ROTL64(hash[23], 56);
hash[24] = ROTL64(hash[24], 14);
keccak_pi(hash);
keccak_chi(hash);
/* apply iota(hash, round) */
*hash ^= keccak_round_constants[round];
}
}
void sha3_write(digest_t *digest, const char *msg, size_t size)
{
size_t rest = digest->state.sha3.rest;
size_t block_size = digest->state.sha3.block_size;
digest->state.sha3.rest = (rest + size) % block_size;
/* fill partial block */
if (rest) {
size_t left = block_size - rest;
memcpy(digest->state.sha3.message + rest, msg, (size < left ? size : left));
if (size < left) return;
/* process partial block */
sha3_process_block(digest->state.sha3.hash, (uint64_t*)digest->state.sha3.message, block_size);
msg += left;
size -= left;
}
while (size >= block_size) {
const char *aligned_message_block;
if (((intptr_t)(void*)msg) & 7) {
memcpy(digest->state.sha3.message, msg, block_size);
aligned_message_block = digest->state.sha3.message;
} else {
aligned_message_block = msg;
}
sha3_process_block(digest->state.sha3.hash, (uint64_t*)aligned_message_block, block_size);
msg += block_size;
size -= block_size;
}
if (size)
memcpy(digest->state.sha3.message, msg, size); /* save leftovers */
}
static inline size_t sha3_read(digest_t *digest, void *buf, size_t len)
{
const size_t block_size = digest->state.sha3.block_size;
memset(digest->state.sha3.message + digest->state.sha3.rest, 0, block_size - digest->state.sha3.rest);
digest->state.sha3.message[digest->state.sha3.rest] |= 0x06;
digest->state.sha3.message[block_size - 1] |= 0x80;
sha3_process_block(digest->state.sha3.hash, (uint64_t*)digest->state.sha3.message, block_size);
#ifdef WORDS_BIGENDIAN
do {
size_t i;
for (i = 0; i < (sizeof(digest->state.sha3.hash)/sizeof(*digest->state.sha3.hash)); i++)
digest->state.sha3.hash[i] = digest_htole64(digest->state.sha3.hash[i]);
} while (0);
#endif
if (len > (100 - digest->state.sha3.block_size / 2))
len = 100 - digest->state.sha3.block_size / 2;
memcpy(buf, digest->state.sha3.hash, len);
return len;
}
const char *digest_algo_id2str(digest_algo_t algo)
{
switch (algo) {
case DIGEST_ALGO_MD5:
return "MD5";
break;
case DIGEST_ALGO_SHA3_224:
return "SHA3-224";
break;
case DIGEST_ALGO_SHA3_256:
return "SHA3-256";
break;
case DIGEST_ALGO_SHA3_384:
return "SHA3-384";
break;
case DIGEST_ALGO_SHA3_512:
return "SHA3-512";
break;
}
return NULL;
}
ssize_t digest_algo_length_bytes(digest_algo_t algo)
{
switch (algo) {
case DIGEST_ALGO_MD5:
return 16;
break;
case DIGEST_ALGO_SHA3_224:
return 224/8;
break;
case DIGEST_ALGO_SHA3_256:
return 256/8;
break;
case DIGEST_ALGO_SHA3_384:
return 384/8;
break;
case DIGEST_ALGO_SHA3_512:
return 512/8;
break;
}
return -1;
}
digest_t * digest_new(digest_algo_t algo)
{
digest_t *digest = refobject_new__new(digest_t, NULL, NULL, NULL);
if (!digest)
return NULL;
digest->algo = algo;
switch (algo) {
case DIGEST_ALGO_MD5:
MD5Init(&(digest->state.md5));
break;
case DIGEST_ALGO_SHA3_224:
sha3_init(digest, 224);
break;
case DIGEST_ALGO_SHA3_256:
sha3_init(digest, 256);
break;
case DIGEST_ALGO_SHA3_384:
sha3_init(digest, 384);
break;
case DIGEST_ALGO_SHA3_512:
sha3_init(digest, 512);
break;
default:
refobject_unref(digest);
return NULL;
break;
}
return digest;
}
digest_t * digest_copy(digest_t *digest)
{
digest_t *n;
if (!digest)
return NULL;
n = refobject_new__new(digest_t, NULL, NULL, NULL);
n->algo = digest->algo;
n->done = digest->done;
n->state = digest->state;
return n;
}
ssize_t digest_write(digest_t *digest, const void *data, size_t len)
{
if (!digest || !data)
return -1;
if (digest->done)
return -1;
switch (digest->algo) {
case DIGEST_ALGO_MD5:
MD5Update(&(digest->state.md5), (const unsigned char *)data, len);
return len;
break;
case DIGEST_ALGO_SHA3_224:
case DIGEST_ALGO_SHA3_256:
case DIGEST_ALGO_SHA3_384:
case DIGEST_ALGO_SHA3_512:
sha3_write(digest, data, len);
return len;
break;
default:
return -1;
break;
}
}
ssize_t digest_read(digest_t *digest, void *buf, size_t len)
{
if (!digest || !buf)
return -1;
if (digest->done)
return -1;
digest->done = 1;
switch (digest->algo) {
case DIGEST_ALGO_MD5:
if (len < HASH_LEN) {
unsigned char buffer[HASH_LEN];
MD5Final(buffer, &(digest->state.md5));
memcpy(buf, buffer, len);
return len;
} else {
MD5Final((unsigned char*)buf, &(digest->state.md5));
return HASH_LEN;
}
break;
case DIGEST_ALGO_SHA3_224:
case DIGEST_ALGO_SHA3_256:
case DIGEST_ALGO_SHA3_384:
case DIGEST_ALGO_SHA3_512:
return sha3_read(digest, buf, len);
break;
default:
return -1;
break;
}
}
ssize_t digest_length_bytes(digest_t *digest)
{
if (!digest)
return -1;
return digest_algo_length_bytes(digest->algo);
}
static size_t __digest_algo_blocklength(digest_algo_t algo)
{
switch (algo) {
case DIGEST_ALGO_MD5: return 64; break;
case DIGEST_ALGO_SHA3_224: return 144; break;
case DIGEST_ALGO_SHA3_256: return 136; break;
case DIGEST_ALGO_SHA3_384: return 104; break;
case DIGEST_ALGO_SHA3_512: return 72; break;
}
return 0;
}
hmac_t * hmac_new(digest_algo_t algo, const void *key, size_t keylen)
{
hmac_t *hmac;
size_t blocklen = __digest_algo_blocklength(algo);
char *keycopy = calloc(1, blocklen);
size_t i;
if (!blocklen)
return NULL;
if (keylen > blocklen) {
size_t digestlen = digest_algo_length_bytes(algo);
digest_t *digest = digest_new(algo);
if (!digest) {
free(keycopy);
return NULL;
}
if (digest_write(digest, key, keylen) != (ssize_t)keylen) {
refobject_unref(digest);
free(keycopy);
return NULL;
}
if (digest_read(digest, keycopy, digestlen) != (ssize_t)digestlen) {
refobject_unref(digest);
free(keycopy);
return NULL;
}
refobject_unref(digest);
} else {
memcpy(keycopy, key, keylen);
}
hmac = refobject_new__new(hmac_t, NULL, NULL, NULL);
if (!hmac)
return NULL;
hmac->algo = algo;
hmac->key = keycopy;
hmac->key_len = blocklen;
hmac->inner = digest_new(algo);
if (!hmac->inner) {
refobject_unref(hmac);
return NULL;
}
for (i = 0; i < blocklen; i++) {
char x = keycopy[i] ^ 0x36;
if (digest_write(hmac->inner, &x, 1) != 1) {
refobject_unref(hmac);
return NULL;
}
}
return hmac;
}
hmac_t * hmac_copy(hmac_t *hmac)
{
hmac_t *n;
if (!hmac)
return NULL;
n = refobject_new__new(hmac_t, NULL, NULL, NULL);
n->algo = hmac->algo;
n->key = malloc(n->key_len);
if (!n->key) {
refobject_unref(n);
return NULL;
}
memcpy(n->key, hmac->key, hmac->key_len);
n->key_len = hmac->key_len;
n->inner = digest_copy(hmac->inner);
if (!n->inner) {
refobject_unref(n);
return NULL;
}
return n;
}
ssize_t hmac_write(hmac_t *hmac, const void *data, size_t len)
{
if (!hmac)
return -1;
return digest_write(hmac->inner, data, len);
}
ssize_t hmac_read(hmac_t *hmac, void *buf, size_t len)
{
size_t digestlen;
digest_t *digest;
char *res;
size_t i;
ssize_t ret;
if (!hmac)
return -1;
digestlen = digest_algo_length_bytes(hmac->algo);
digest = digest_new(hmac->algo);
if (!digest)
return -1;
res = malloc(digestlen);
if (!res) {
refobject_unref(digest);
return -1;
}
for (i = 0; i < hmac->key_len; i++) {
char x = hmac->key[i] ^ 0x5C;
if (digest_write(digest, &x, 1) != 1) {
free(res);
refobject_unref(digest);
return -1;
}
}
if (digest_read(hmac->inner, res, digestlen) != (ssize_t)digestlen) {
free(res);
refobject_unref(digest);
return -1;
}
if (digest_write(digest, res, digestlen) != (ssize_t)digestlen) {
free(res);
refobject_unref(digest);
return -1;
}
ret = digest_read(digest, buf, len);
free(res);
refobject_unref(digest);
return ret;
}
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