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418 lines
12 KiB
C
418 lines
12 KiB
C
/*-
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* Copyright 2005,2007,2009 Colin Percival
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <zebra.h>
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#include "sha256.h"
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#if !HAVE_DECL_BE32DEC
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static inline uint32_t be32dec(const void *pp)
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{
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const uint8_t *p = (uint8_t const *)pp;
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return ((uint32_t)(p[3]) + ((uint32_t)(p[2]) << 8)
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+ ((uint32_t)(p[1]) << 16) + ((uint32_t)(p[0]) << 24));
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}
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#else
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#include <sys/endian.h>
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#endif
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#if !HAVE_DECL_BE32ENC
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static inline void be32enc(void *pp, uint32_t x)
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{
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uint8_t *p = (uint8_t *)pp;
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p[3] = x & 0xff;
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p[2] = (x >> 8) & 0xff;
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p[1] = (x >> 16) & 0xff;
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p[0] = (x >> 24) & 0xff;
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}
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#else
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#include <sys/endian.h>
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#endif
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/*
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* Encode a length len/4 vector of (uint32_t) into a length len vector of
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* (unsigned char) in big-endian form. Assumes len is a multiple of 4.
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*/
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static void be32enc_vect(unsigned char *dst, const uint32_t *src, size_t len)
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{
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size_t i;
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for (i = 0; i < len / 4; i++)
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be32enc(dst + i * 4, src[i]);
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}
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/*
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* Decode a big-endian length len vector of (unsigned char) into a length
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* len/4 vector of (uint32_t). Assumes len is a multiple of 4.
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*/
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static void be32dec_vect(uint32_t *dst, const unsigned char *src, size_t len)
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{
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size_t i;
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for (i = 0; i < len / 4; i++)
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dst[i] = be32dec(src + i * 4);
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}
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/* Elementary functions used by SHA256 */
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#define Ch(x, y, z) ((x & (y ^ z)) ^ z)
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#define Maj(x, y, z) ((x & (y | z)) | (y & z))
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#define SHR(x, n) (x >> n)
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#define ROTR(x, n) ((x >> n) | (x << (32 - n)))
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#define S0(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
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#define S1(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
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#define s0(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHR(x, 3))
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#define s1(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHR(x, 10))
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/* SHA256 round function */
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#define RND(a, b, c, d, e, f, g, h, k) \
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t0 = h + S1(e) + Ch(e, f, g) + k; \
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t1 = S0(a) + Maj(a, b, c); \
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d += t0; \
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h = t0 + t1;
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/* Adjusted round function for rotating state */
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#define RNDr(S, W, i, k) \
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RND(S[(64 - i) % 8], S[(65 - i) % 8], S[(66 - i) % 8], \
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S[(67 - i) % 8], S[(68 - i) % 8], S[(69 - i) % 8], \
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S[(70 - i) % 8], S[(71 - i) % 8], W[i] + k)
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/*
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* SHA256 block compression function. The 256-bit state is transformed via
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* the 512-bit input block to produce a new state.
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*/
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static void SHA256_Transform(uint32_t *state, const unsigned char block[64])
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{
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uint32_t W[64];
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uint32_t S[8];
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uint32_t t0, t1;
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int i;
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/* 1. Prepare message schedule W. */
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be32dec_vect(W, block, 64);
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for (i = 16; i < 64; i++)
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W[i] = s1(W[i - 2]) + W[i - 7] + s0(W[i - 15]) + W[i - 16];
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/* 2. Initialize working variables. */
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memcpy(S, state, 32);
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/* 3. Mix. */
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RNDr(S, W, 0, 0x428a2f98);
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RNDr(S, W, 1, 0x71374491);
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RNDr(S, W, 2, 0xb5c0fbcf);
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RNDr(S, W, 3, 0xe9b5dba5);
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RNDr(S, W, 4, 0x3956c25b);
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RNDr(S, W, 5, 0x59f111f1);
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RNDr(S, W, 6, 0x923f82a4);
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RNDr(S, W, 7, 0xab1c5ed5);
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RNDr(S, W, 8, 0xd807aa98);
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RNDr(S, W, 9, 0x12835b01);
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RNDr(S, W, 10, 0x243185be);
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RNDr(S, W, 11, 0x550c7dc3);
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RNDr(S, W, 12, 0x72be5d74);
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RNDr(S, W, 13, 0x80deb1fe);
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RNDr(S, W, 14, 0x9bdc06a7);
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RNDr(S, W, 15, 0xc19bf174);
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RNDr(S, W, 16, 0xe49b69c1);
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RNDr(S, W, 17, 0xefbe4786);
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RNDr(S, W, 18, 0x0fc19dc6);
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RNDr(S, W, 19, 0x240ca1cc);
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RNDr(S, W, 20, 0x2de92c6f);
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RNDr(S, W, 21, 0x4a7484aa);
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RNDr(S, W, 22, 0x5cb0a9dc);
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RNDr(S, W, 23, 0x76f988da);
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RNDr(S, W, 24, 0x983e5152);
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RNDr(S, W, 25, 0xa831c66d);
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RNDr(S, W, 26, 0xb00327c8);
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RNDr(S, W, 27, 0xbf597fc7);
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RNDr(S, W, 28, 0xc6e00bf3);
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RNDr(S, W, 29, 0xd5a79147);
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RNDr(S, W, 30, 0x06ca6351);
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RNDr(S, W, 31, 0x14292967);
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RNDr(S, W, 32, 0x27b70a85);
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RNDr(S, W, 33, 0x2e1b2138);
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RNDr(S, W, 34, 0x4d2c6dfc);
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RNDr(S, W, 35, 0x53380d13);
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RNDr(S, W, 36, 0x650a7354);
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RNDr(S, W, 37, 0x766a0abb);
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RNDr(S, W, 38, 0x81c2c92e);
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RNDr(S, W, 39, 0x92722c85);
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RNDr(S, W, 40, 0xa2bfe8a1);
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RNDr(S, W, 41, 0xa81a664b);
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RNDr(S, W, 42, 0xc24b8b70);
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RNDr(S, W, 43, 0xc76c51a3);
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RNDr(S, W, 44, 0xd192e819);
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RNDr(S, W, 45, 0xd6990624);
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RNDr(S, W, 46, 0xf40e3585);
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RNDr(S, W, 47, 0x106aa070);
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RNDr(S, W, 48, 0x19a4c116);
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RNDr(S, W, 49, 0x1e376c08);
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RNDr(S, W, 50, 0x2748774c);
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RNDr(S, W, 51, 0x34b0bcb5);
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RNDr(S, W, 52, 0x391c0cb3);
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RNDr(S, W, 53, 0x4ed8aa4a);
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RNDr(S, W, 54, 0x5b9cca4f);
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RNDr(S, W, 55, 0x682e6ff3);
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RNDr(S, W, 56, 0x748f82ee);
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RNDr(S, W, 57, 0x78a5636f);
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RNDr(S, W, 58, 0x84c87814);
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RNDr(S, W, 59, 0x8cc70208);
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RNDr(S, W, 60, 0x90befffa);
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RNDr(S, W, 61, 0xa4506ceb);
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RNDr(S, W, 62, 0xbef9a3f7);
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RNDr(S, W, 63, 0xc67178f2);
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/* 4. Mix local working variables into global state */
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for (i = 0; i < 8; i++)
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state[i] += S[i];
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/* Clean the stack. */
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memset(W, 0, 256);
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memset(S, 0, 32);
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memset(&t0, 0, sizeof(t0));
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memset(&t1, 0, sizeof(t0));
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}
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static unsigned char PAD[64] = {
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0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
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/* Add padding and terminating bit-count. */
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static void SHA256_Pad(SHA256_CTX *ctx)
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{
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unsigned char len[8];
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uint32_t r, plen;
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/*
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* Convert length to a vector of bytes -- we do this now rather
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* than later because the length will change after we pad.
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*/
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be32enc_vect(len, ctx->count, 8);
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/* Add 1--64 bytes so that the resulting length is 56 mod 64 */
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r = (ctx->count[1] >> 3) & 0x3f;
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plen = (r < 56) ? (56 - r) : (120 - r);
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SHA256_Update(ctx, PAD, (size_t)plen);
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/* Add the terminating bit-count */
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SHA256_Update(ctx, len, 8);
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}
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/* SHA-256 initialization. Begins a SHA-256 operation. */
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void SHA256_Init(SHA256_CTX *ctx)
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{
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/* Zero bits processed so far */
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ctx->count[0] = ctx->count[1] = 0;
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/* Magic initialization constants */
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ctx->state[0] = 0x6A09E667;
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ctx->state[1] = 0xBB67AE85;
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ctx->state[2] = 0x3C6EF372;
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ctx->state[3] = 0xA54FF53A;
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ctx->state[4] = 0x510E527F;
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ctx->state[5] = 0x9B05688C;
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ctx->state[6] = 0x1F83D9AB;
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ctx->state[7] = 0x5BE0CD19;
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}
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/* Add bytes into the hash */
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void SHA256_Update(SHA256_CTX *ctx, const void *in, size_t len)
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{
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uint32_t bitlen[2];
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uint32_t r;
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const unsigned char *src = in;
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/* Number of bytes left in the buffer from previous updates */
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r = (ctx->count[1] >> 3) & 0x3f;
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/* Convert the length into a number of bits */
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bitlen[1] = ((uint32_t)len) << 3;
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bitlen[0] = (uint32_t)(len >> 29);
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/* Update number of bits */
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if ((ctx->count[1] += bitlen[1]) < bitlen[1])
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ctx->count[0]++;
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ctx->count[0] += bitlen[0];
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/* Handle the case where we don't need to perform any transforms */
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if (len < 64 - r) {
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memcpy(&ctx->buf[r], src, len);
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return;
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}
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/* Finish the current block */
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memcpy(&ctx->buf[r], src, 64 - r);
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SHA256_Transform(ctx->state, ctx->buf);
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src += 64 - r;
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len -= 64 - r;
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/* Perform complete blocks */
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while (len >= 64) {
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SHA256_Transform(ctx->state, src);
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src += 64;
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len -= 64;
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}
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/* Copy left over data into buffer */
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memcpy(ctx->buf, src, len);
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}
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/*
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* SHA-256 finalization. Pads the input data, exports the hash value,
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* and clears the context state.
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*/
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void SHA256_Final(unsigned char digest[32], SHA256_CTX *ctx)
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{
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/* Add padding */
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SHA256_Pad(ctx);
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/* Write the hash */
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be32enc_vect(digest, ctx->state, 32);
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/* Clear the context state */
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memset((void *)ctx, 0, sizeof(*ctx));
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}
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/* Initialize an HMAC-SHA256 operation with the given key. */
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void HMAC__SHA256_Init(HMAC_SHA256_CTX *ctx, const void *_K, size_t Klen)
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{
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unsigned char pad[64];
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unsigned char khash[32];
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const unsigned char *K = _K;
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size_t i;
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/* If Klen > 64, the key is really SHA256(K). */
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if (Klen > 64) {
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SHA256_Init(&ctx->ictx);
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SHA256_Update(&ctx->ictx, K, Klen);
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SHA256_Final(khash, &ctx->ictx);
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K = khash;
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Klen = 32;
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}
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/* Inner SHA256 operation is SHA256(K xor [block of 0x36] || data). */
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SHA256_Init(&ctx->ictx);
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memset(pad, 0x36, 64);
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for (i = 0; i < Klen; i++)
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pad[i] ^= K[i];
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SHA256_Update(&ctx->ictx, pad, 64);
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/* Outer SHA256 operation is SHA256(K xor [block of 0x5c] || hash). */
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SHA256_Init(&ctx->octx);
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memset(pad, 0x5c, 64);
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for (i = 0; i < Klen; i++)
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pad[i] ^= K[i];
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SHA256_Update(&ctx->octx, pad, 64);
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/* Clean the stack. */
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memset(khash, 0, 32);
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}
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/* Add bytes to the HMAC-SHA256 operation. */
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void HMAC__SHA256_Update(HMAC_SHA256_CTX *ctx, const void *in, size_t len)
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{
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/* Feed data to the inner SHA256 operation. */
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SHA256_Update(&ctx->ictx, in, len);
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}
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/* Finish an HMAC-SHA256 operation. */
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void HMAC__SHA256_Final(unsigned char digest[32], HMAC_SHA256_CTX *ctx)
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{
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unsigned char ihash[32];
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/* Finish the inner SHA256 operation. */
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SHA256_Final(ihash, &ctx->ictx);
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/* Feed the inner hash to the outer SHA256 operation. */
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SHA256_Update(&ctx->octx, ihash, 32);
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/* Finish the outer SHA256 operation. */
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SHA256_Final(digest, &ctx->octx);
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/* Clean the stack. */
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memset(ihash, 0, 32);
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}
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/**
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* PBKDF2_SHA256(passwd, passwdlen, salt, saltlen, c, buf, dkLen):
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* Compute PBKDF2(passwd, salt, c, dkLen) using HMAC-SHA256 as the PRF, and
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* write the output to buf. The value dkLen must be at most 32 * (2^32 - 1).
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*/
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void PBKDF2_SHA256(const uint8_t *passwd, size_t passwdlen, const uint8_t *salt,
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size_t saltlen, uint64_t c, uint8_t *buf, size_t dkLen)
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{
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HMAC_SHA256_CTX PShctx, hctx;
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size_t i;
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uint8_t ivec[4];
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uint8_t U[32];
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uint8_t T[32];
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uint64_t j;
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int k;
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size_t clen;
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/* Compute HMAC state after processing P and S. */
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HMAC__SHA256_Init(&PShctx, passwd, passwdlen);
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HMAC__SHA256_Update(&PShctx, salt, saltlen);
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/* Iterate through the blocks. */
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for (i = 0; i * 32 < dkLen; i++) {
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/* Generate INT(i + 1). */
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be32enc(ivec, (uint32_t)(i + 1));
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/* Compute U_1 = PRF(P, S || INT(i)). */
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memcpy(&hctx, &PShctx, sizeof(HMAC_SHA256_CTX));
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HMAC__SHA256_Update(&hctx, ivec, 4);
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HMAC__SHA256_Final(U, &hctx);
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/* T_i = U_1 ... */
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memcpy(T, U, 32);
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for (j = 2; j <= c; j++) {
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/* Compute U_j. */
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HMAC__SHA256_Init(&hctx, passwd, passwdlen);
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HMAC__SHA256_Update(&hctx, U, 32);
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HMAC__SHA256_Final(U, &hctx);
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/* ... xor U_j ... */
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for (k = 0; k < 32; k++)
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T[k] ^= U[k];
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}
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/* Copy as many bytes as necessary into buf. */
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clen = dkLen - i * 32;
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if (clen > 32)
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clen = 32;
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memcpy(&buf[i * 32], T, clen);
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}
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/* Clean PShctx, since we never called _Final on it. */
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memset(&PShctx, 0, sizeof(HMAC_SHA256_CTX));
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}
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