mirror of
https://github.com/cryb-to/cryb-to.git
synced 2024-11-27 08:05:42 +00:00
b0ff5af2ba
Fix context length in the algorithm descriptors. Expose the block length and include it in the algorithm descriptors. Complete the list of available digest algorithms.
477 lines
12 KiB
C
477 lines
12 KiB
C
/*-
|
|
* Copyright (c) 2005-2013 Colin Percival
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $Cryb$
|
|
*/
|
|
|
|
#include "cryb/impl.h"
|
|
|
|
#ifdef HAVE_SYS_ENDIAN_H
|
|
#include <sys/endian.h>
|
|
#endif
|
|
|
|
#ifdef HAVE_ENDIAN_H
|
|
#define _BSD_SOURCE
|
|
#include <endian.h>
|
|
#endif
|
|
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
|
|
#include <cryb/sha256.h>
|
|
|
|
/*
|
|
* Encode a length len/4 vector of (uint32_t) into a length len vector of
|
|
* (uint8_t) in big-endian form. Assumes len is a multiple of 4.
|
|
*/
|
|
static void
|
|
be32enc_vect(uint8_t *dst, const uint32_t *src, size_t len)
|
|
{
|
|
size_t i;
|
|
|
|
for (i = 0; i < len / 4; i++)
|
|
be32enc(dst + i * 4, src[i]);
|
|
}
|
|
|
|
/*
|
|
* Decode a big-endian length len vector of (uint8_t) into a length
|
|
* len/4 vector of (uint32_t). Assumes len is a multiple of 4.
|
|
*/
|
|
static void
|
|
be32dec_vect(uint32_t *dst, const uint8_t *src, size_t len)
|
|
{
|
|
size_t i;
|
|
|
|
for (i = 0; i < len / 4; i++)
|
|
dst[i] = be32dec(src + i * 4);
|
|
}
|
|
|
|
/* Elementary functions used by SHA256 */
|
|
#define Ch(x, y, z) ((x & (y ^ z)) ^ z)
|
|
#define Maj(x, y, z) ((x & (y | z)) | (y & z))
|
|
#define SHR(x, n) (x >> n)
|
|
#define ROTR(x, n) ((x >> n) | (x << (32 - n)))
|
|
#define S0(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
|
|
#define S1(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
|
|
#define s0(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHR(x, 3))
|
|
#define s1(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHR(x, 10))
|
|
|
|
/* SHA256 round function */
|
|
#define RND(a, b, c, d, e, f, g, h, k) \
|
|
t0 = h + S1(e) + Ch(e, f, g) + k; \
|
|
t1 = S0(a) + Maj(a, b, c); \
|
|
d += t0; \
|
|
h = t0 + t1;
|
|
|
|
/* Adjusted round function for rotating state */
|
|
#define RNDr(S, W, i, k) \
|
|
RND(S[(64 - i) % 8], S[(65 - i) % 8], \
|
|
S[(66 - i) % 8], S[(67 - i) % 8], \
|
|
S[(68 - i) % 8], S[(69 - i) % 8], \
|
|
S[(70 - i) % 8], S[(71 - i) % 8], \
|
|
W[i] + k)
|
|
|
|
/*
|
|
* SHA256 block compression function. The 256-bit state is transformed via
|
|
* the 512-bit input block to produce a new state.
|
|
*/
|
|
static void
|
|
sha256_Transform(uint32_t * state, const uint8_t block[64])
|
|
{
|
|
uint32_t W[64];
|
|
uint32_t S[8];
|
|
uint32_t t0, t1;
|
|
int i;
|
|
|
|
/* 1. Prepare message schedule W. */
|
|
be32dec_vect(W, block, 64);
|
|
for (i = 16; i < 64; i++)
|
|
W[i] = s1(W[i - 2]) + W[i - 7] + s0(W[i - 15]) + W[i - 16];
|
|
|
|
/* 2. Initialize working variables. */
|
|
memcpy(S, state, 32);
|
|
|
|
/* 3. Mix. */
|
|
RNDr(S, W, 0, 0x428a2f98);
|
|
RNDr(S, W, 1, 0x71374491);
|
|
RNDr(S, W, 2, 0xb5c0fbcf);
|
|
RNDr(S, W, 3, 0xe9b5dba5);
|
|
RNDr(S, W, 4, 0x3956c25b);
|
|
RNDr(S, W, 5, 0x59f111f1);
|
|
RNDr(S, W, 6, 0x923f82a4);
|
|
RNDr(S, W, 7, 0xab1c5ed5);
|
|
RNDr(S, W, 8, 0xd807aa98);
|
|
RNDr(S, W, 9, 0x12835b01);
|
|
RNDr(S, W, 10, 0x243185be);
|
|
RNDr(S, W, 11, 0x550c7dc3);
|
|
RNDr(S, W, 12, 0x72be5d74);
|
|
RNDr(S, W, 13, 0x80deb1fe);
|
|
RNDr(S, W, 14, 0x9bdc06a7);
|
|
RNDr(S, W, 15, 0xc19bf174);
|
|
RNDr(S, W, 16, 0xe49b69c1);
|
|
RNDr(S, W, 17, 0xefbe4786);
|
|
RNDr(S, W, 18, 0x0fc19dc6);
|
|
RNDr(S, W, 19, 0x240ca1cc);
|
|
RNDr(S, W, 20, 0x2de92c6f);
|
|
RNDr(S, W, 21, 0x4a7484aa);
|
|
RNDr(S, W, 22, 0x5cb0a9dc);
|
|
RNDr(S, W, 23, 0x76f988da);
|
|
RNDr(S, W, 24, 0x983e5152);
|
|
RNDr(S, W, 25, 0xa831c66d);
|
|
RNDr(S, W, 26, 0xb00327c8);
|
|
RNDr(S, W, 27, 0xbf597fc7);
|
|
RNDr(S, W, 28, 0xc6e00bf3);
|
|
RNDr(S, W, 29, 0xd5a79147);
|
|
RNDr(S, W, 30, 0x06ca6351);
|
|
RNDr(S, W, 31, 0x14292967);
|
|
RNDr(S, W, 32, 0x27b70a85);
|
|
RNDr(S, W, 33, 0x2e1b2138);
|
|
RNDr(S, W, 34, 0x4d2c6dfc);
|
|
RNDr(S, W, 35, 0x53380d13);
|
|
RNDr(S, W, 36, 0x650a7354);
|
|
RNDr(S, W, 37, 0x766a0abb);
|
|
RNDr(S, W, 38, 0x81c2c92e);
|
|
RNDr(S, W, 39, 0x92722c85);
|
|
RNDr(S, W, 40, 0xa2bfe8a1);
|
|
RNDr(S, W, 41, 0xa81a664b);
|
|
RNDr(S, W, 42, 0xc24b8b70);
|
|
RNDr(S, W, 43, 0xc76c51a3);
|
|
RNDr(S, W, 44, 0xd192e819);
|
|
RNDr(S, W, 45, 0xd6990624);
|
|
RNDr(S, W, 46, 0xf40e3585);
|
|
RNDr(S, W, 47, 0x106aa070);
|
|
RNDr(S, W, 48, 0x19a4c116);
|
|
RNDr(S, W, 49, 0x1e376c08);
|
|
RNDr(S, W, 50, 0x2748774c);
|
|
RNDr(S, W, 51, 0x34b0bcb5);
|
|
RNDr(S, W, 52, 0x391c0cb3);
|
|
RNDr(S, W, 53, 0x4ed8aa4a);
|
|
RNDr(S, W, 54, 0x5b9cca4f);
|
|
RNDr(S, W, 55, 0x682e6ff3);
|
|
RNDr(S, W, 56, 0x748f82ee);
|
|
RNDr(S, W, 57, 0x78a5636f);
|
|
RNDr(S, W, 58, 0x84c87814);
|
|
RNDr(S, W, 59, 0x8cc70208);
|
|
RNDr(S, W, 60, 0x90befffa);
|
|
RNDr(S, W, 61, 0xa4506ceb);
|
|
RNDr(S, W, 62, 0xbef9a3f7);
|
|
RNDr(S, W, 63, 0xc67178f2);
|
|
|
|
/* 4. Mix local working variables into global state. */
|
|
for (i = 0; i < 8; i++)
|
|
state[i] += S[i];
|
|
|
|
/* Clean the stack. */
|
|
memset(W, 0, 256);
|
|
memset(S, 0, 32);
|
|
t0 = t1 = 0;
|
|
}
|
|
|
|
static uint8_t PAD[64] = {
|
|
0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
|
|
};
|
|
|
|
/* Add padding and terminating bit-count. */
|
|
static void
|
|
sha256_pad(sha256_ctx * ctx)
|
|
{
|
|
uint8_t len[8];
|
|
uint32_t r, plen;
|
|
|
|
/*
|
|
* Convert length to a vector of bytes -- we do this now rather
|
|
* than later because the length will change after we pad.
|
|
*/
|
|
be64enc(len, ctx->count);
|
|
|
|
/* Add 1--64 bytes so that the resulting length is 56 mod 64. */
|
|
r = (ctx->count >> 3) & 0x3f;
|
|
plen = (r < 56) ? (56 - r) : (120 - r);
|
|
sha256_update(ctx, PAD, (size_t)plen);
|
|
|
|
/* Add the terminating bit-count. */
|
|
sha256_update(ctx, len, 8);
|
|
}
|
|
|
|
/**
|
|
* sha256_init(ctx):
|
|
* Initialize the SHA256 context ${ctx}.
|
|
*/
|
|
void
|
|
sha256_init(sha256_ctx * ctx)
|
|
{
|
|
|
|
/* Zero bits processed so far. */
|
|
ctx->count = 0;
|
|
|
|
/* Magic initialization constants. */
|
|
ctx->state[0] = 0x6A09E667;
|
|
ctx->state[1] = 0xBB67AE85;
|
|
ctx->state[2] = 0x3C6EF372;
|
|
ctx->state[3] = 0xA54FF53A;
|
|
ctx->state[4] = 0x510E527F;
|
|
ctx->state[5] = 0x9B05688C;
|
|
ctx->state[6] = 0x1F83D9AB;
|
|
ctx->state[7] = 0x5BE0CD19;
|
|
}
|
|
|
|
/**
|
|
* sha256_update(ctx, in, len):
|
|
* Input ${len} bytes from ${in} into the SHA256 context ${ctx}.
|
|
*/
|
|
void
|
|
sha256_update(sha256_ctx * ctx, const void *in, size_t len)
|
|
{
|
|
uint32_t r;
|
|
const uint8_t *src = in;
|
|
|
|
/* Return immediately if we have nothing to do. */
|
|
if (len == 0)
|
|
return;
|
|
|
|
/* Number of bytes left in the buffer from previous updates. */
|
|
r = (ctx->count >> 3) & 0x3f;
|
|
|
|
/* Update number of bits. */
|
|
ctx->count += (uint64_t)(len) << 3;
|
|
|
|
/* Handle the case where we don't need to perform any transforms. */
|
|
if (len < 64 - r) {
|
|
memcpy(&ctx->buf[r], src, len);
|
|
return;
|
|
}
|
|
|
|
/* Finish the current block. */
|
|
memcpy(&ctx->buf[r], src, 64 - r);
|
|
sha256_Transform(ctx->state, ctx->buf);
|
|
src += 64 - r;
|
|
len -= 64 - r;
|
|
|
|
/* Perform complete blocks. */
|
|
while (len >= 64) {
|
|
sha256_Transform(ctx->state, src);
|
|
src += 64;
|
|
len -= 64;
|
|
}
|
|
|
|
/* Copy left over data into buffer. */
|
|
memcpy(ctx->buf, src, len);
|
|
}
|
|
|
|
/**
|
|
* sha256_final(ctx, digest):
|
|
* Output the SHA256 hash of the data input to the context ${ctx} into the
|
|
* buffer ${digest}.
|
|
*/
|
|
void
|
|
sha256_final(sha256_ctx * ctx, uint8_t digest[SHA256_DIGEST_LEN])
|
|
{
|
|
|
|
/* Add padding. */
|
|
sha256_pad(ctx);
|
|
|
|
/* Write the hash. */
|
|
be32enc_vect(digest, ctx->state, SHA256_DIGEST_LEN);
|
|
|
|
/* Clear the context state. */
|
|
memset((void *)ctx, 0, sizeof(*ctx));
|
|
}
|
|
|
|
/**
|
|
* sha256_complete(in, len, digest):
|
|
* Compute the SHA256 hash of ${len} bytes from $in} and write it to ${digest}.
|
|
*/
|
|
void
|
|
sha256_complete(const void * in, size_t len, uint8_t digest[SHA256_DIGEST_LEN])
|
|
{
|
|
sha256_ctx ctx;
|
|
|
|
sha256_init(&ctx);
|
|
sha256_update(&ctx, in, len);
|
|
sha256_final(&ctx, digest);
|
|
}
|
|
|
|
/**
|
|
* hmac_sha256_init(ctx, K, Klen):
|
|
* Initialize the HMAC-SHA256 context ${ctx} with ${Klen} bytes of key from
|
|
* ${K}.
|
|
*/
|
|
void
|
|
hmac_sha256_init(hmac_sha256_ctx * ctx, const void * _K, size_t Klen)
|
|
{
|
|
uint8_t pad[64];
|
|
uint8_t khash[SHA256_DIGEST_LEN];
|
|
const uint8_t * K = _K;
|
|
size_t i;
|
|
|
|
/* If Klen > 64, the key is really SHA256(K). */
|
|
if (Klen > 64) {
|
|
sha256_init(&ctx->ictx);
|
|
sha256_update(&ctx->ictx, K, Klen);
|
|
sha256_final(&ctx->ictx, khash);
|
|
K = khash;
|
|
Klen = sizeof khash;
|
|
}
|
|
|
|
/* Inner SHA256 operation is SHA256(K xor [block of 0x36] || data). */
|
|
sha256_init(&ctx->ictx);
|
|
memset(pad, 0x36, 64);
|
|
for (i = 0; i < Klen; i++)
|
|
pad[i] ^= K[i];
|
|
sha256_update(&ctx->ictx, pad, 64);
|
|
|
|
/* Outer SHA256 operation is SHA256(K xor [block of 0x5c] || hash). */
|
|
sha256_init(&ctx->octx);
|
|
memset(pad, 0x5c, 64);
|
|
for (i = 0; i < Klen; i++)
|
|
pad[i] ^= K[i];
|
|
sha256_update(&ctx->octx, pad, 64);
|
|
|
|
/* Clean the stack. */
|
|
memset(khash, 0, sizeof khash);
|
|
memset(pad, 0, 64);
|
|
}
|
|
|
|
/**
|
|
* hmac_sha256_update(ctx, in, len):
|
|
* Input ${len} bytes from ${in} into the HMAC-SHA256 context ${ctx}.
|
|
*/
|
|
void
|
|
hmac_sha256_update(hmac_sha256_ctx * ctx, const void *in, size_t len)
|
|
{
|
|
|
|
/* Feed data to the inner SHA256 operation. */
|
|
sha256_update(&ctx->ictx, in, len);
|
|
}
|
|
|
|
/**
|
|
* hmac_sha256_final(ctx, digest):
|
|
* Output the HMAC-SHA256 of the data input to the context ${ctx} into the
|
|
* buffer ${digest}.
|
|
*/
|
|
void
|
|
hmac_sha256_final(hmac_sha256_ctx * ctx, uint8_t digest[SHA256_DIGEST_LEN])
|
|
{
|
|
uint8_t ihash[SHA256_DIGEST_LEN];
|
|
|
|
/* Finish the inner SHA256 operation. */
|
|
sha256_final(&ctx->ictx, ihash);
|
|
|
|
/* Feed the inner hash to the outer SHA256 operation. */
|
|
sha256_update(&ctx->octx, ihash, sizeof ihash);
|
|
|
|
/* Finish the outer SHA256 operation. */
|
|
sha256_final(&ctx->octx, digest);
|
|
|
|
/* Clean the stack. */
|
|
memset(ihash, 0, sizeof ihash);
|
|
}
|
|
|
|
/**
|
|
* hmac_sha256_complete(K, Klen, in, len, digest):
|
|
* Compute the HMAC-SHA256 of ${len} bytes from ${in} using the key ${K} of
|
|
* length ${Klen}, and write the result to ${digest}.
|
|
*/
|
|
void
|
|
hmac_sha256_complete(const void * K, size_t Klen, const void * in, size_t len,
|
|
uint8_t digest[SHA256_DIGEST_LEN])
|
|
{
|
|
hmac_sha256_ctx ctx;
|
|
|
|
hmac_sha256_init(&ctx, K, Klen);
|
|
hmac_sha256_update(&ctx, in, len);
|
|
hmac_sha256_final(&ctx, digest);
|
|
}
|
|
|
|
/**
|
|
* PBKDF2_SHA256(passwd, passwdlen, salt, saltlen, c, buf, dkLen):
|
|
* Compute PBKDF2(passwd, salt, c, dkLen) using HMAC-SHA256 as the PRF, and
|
|
* write the output to buf. The value dkLen must be at most 32 * (2^32 - 1).
|
|
*/
|
|
void
|
|
pbkdf2_sha256(const uint8_t * passwd, size_t passwdlen, const uint8_t * salt,
|
|
size_t saltlen, uint64_t c, uint8_t * buf, size_t dkLen)
|
|
{
|
|
hmac_sha256_ctx PShctx, hctx;
|
|
size_t i;
|
|
uint8_t ivec[4];
|
|
uint8_t U[SHA256_DIGEST_LEN];
|
|
uint8_t T[SHA256_DIGEST_LEN];
|
|
uint64_t j;
|
|
unsigned int k;
|
|
size_t clen;
|
|
|
|
/* Compute HMAC state after processing P and S. */
|
|
hmac_sha256_init(&PShctx, passwd, passwdlen);
|
|
hmac_sha256_update(&PShctx, salt, saltlen);
|
|
|
|
/* Iterate through the blocks. */
|
|
for (i = 0; i * 32 < dkLen; i++) {
|
|
/* Generate INT(i + 1). */
|
|
be32enc(ivec, (uint32_t)(i + 1));
|
|
|
|
/* Compute U_1 = PRF(P, S || INT(i)). */
|
|
memcpy(&hctx, &PShctx, sizeof(hmac_sha256_ctx));
|
|
hmac_sha256_update(&hctx, ivec, 4);
|
|
hmac_sha256_final(&hctx, U);
|
|
|
|
/* T_i = U_1 ... */
|
|
memcpy(T, U, sizeof T);
|
|
|
|
for (j = 2; j <= c; j++) {
|
|
/* Compute U_j. */
|
|
hmac_sha256_init(&hctx, passwd, passwdlen);
|
|
hmac_sha256_update(&hctx, U, 32);
|
|
hmac_sha256_final(&hctx, U);
|
|
|
|
/* ... xor U_j ... */
|
|
for (k = 0; k < sizeof T; k++)
|
|
T[k] ^= U[k];
|
|
}
|
|
|
|
/* Copy as many bytes as necessary into buf. */
|
|
clen = dkLen - i * 32;
|
|
if (clen > 32)
|
|
clen = 32;
|
|
memcpy(&buf[i * 32], T, clen);
|
|
}
|
|
|
|
/* Clean PShctx, since we never called _final on it. */
|
|
memset(&PShctx, 0, sizeof(hmac_sha256_ctx));
|
|
}
|
|
|
|
digest_algorithm sha256_digest = {
|
|
.name = "sha256",
|
|
.contextlen = sizeof sha256_digest,
|
|
.blocklen = SHA256_BLOCK_LEN,
|
|
.digestlen = SHA256_DIGEST_LEN,
|
|
.init = (digest_init_func)sha256_init,
|
|
.update = (digest_update_func)sha256_update,
|
|
.final = (digest_final_func)sha256_final,
|
|
.complete = (digest_complete_func)sha256_complete,
|
|
};
|