1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mozglue/android/pbkdf2_sha256.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,432 @@
1.4 +/*-
1.5 + * Copyright 2005,2007,2009 Colin Percival
1.6 + * All rights reserved.
1.7 + *
1.8 + * Redistribution and use in source and binary forms, with or without
1.9 + * modification, are permitted provided that the following conditions
1.10 + * are met:
1.11 + * 1. Redistributions of source code must retain the above copyright
1.12 + * notice, this list of conditions and the following disclaimer.
1.13 + * 2. Redistributions in binary form must reproduce the above copyright
1.14 + * notice, this list of conditions and the following disclaimer in the
1.15 + * documentation and/or other materials provided with the distribution.
1.16 + *
1.17 + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
1.18 + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.19 + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.20 + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
1.21 + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
1.22 + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
1.23 + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
1.24 + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
1.25 + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
1.26 + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
1.27 + * SUCH DAMAGE.
1.28 + */
1.29 +#include <sys/types.h>
1.30 +
1.31 +#include <stdint.h>
1.32 +#include <string.h>
1.33 +
1.34 +#include <sys/endian.h>
1.35 +
1.36 +#include "pbkdf2_sha256.h"
1.37 +
1.38 +static inline uint32_t
1.39 +be32dec(const void *pp)
1.40 +{
1.41 + const uint8_t *p = (uint8_t const *)pp;
1.42 +
1.43 + return ((uint32_t)(p[3]) +
1.44 + ((uint32_t)(p[2]) << 8) +
1.45 + ((uint32_t)(p[1]) << 16) +
1.46 + ((uint32_t)(p[0]) << 24));
1.47 +}
1.48 +
1.49 +static inline void
1.50 +be32enc(void *pp, uint32_t x)
1.51 +{
1.52 + uint8_t * p = (uint8_t *)pp;
1.53 +
1.54 + p[3] = x & 0xff;
1.55 + p[2] = (x >> 8) & 0xff;
1.56 + p[1] = (x >> 16) & 0xff;
1.57 + p[0] = (x >> 24) & 0xff;
1.58 +}
1.59 +
1.60 +/*
1.61 + * Encode a length len/4 vector of (uint32_t) into a length len vector of
1.62 + * (unsigned char) in big-endian form. Assumes len is a multiple of 4.
1.63 + */
1.64 +static void
1.65 +be32enc_vect(unsigned char *dst, const uint32_t *src, size_t len)
1.66 +{
1.67 + size_t i;
1.68 +
1.69 + for (i = 0; i < len / 4; i++)
1.70 + be32enc(dst + i * 4, src[i]);
1.71 +}
1.72 +
1.73 +/*
1.74 + * Decode a big-endian length len vector of (unsigned char) into a length
1.75 + * len/4 vector of (uint32_t). Assumes len is a multiple of 4.
1.76 + */
1.77 +static void
1.78 +be32dec_vect(uint32_t *dst, const unsigned char *src, size_t len)
1.79 +{
1.80 + size_t i;
1.81 +
1.82 + for (i = 0; i < len / 4; i++)
1.83 + dst[i] = be32dec(src + i * 4);
1.84 +}
1.85 +
1.86 +/* Elementary functions used by SHA256 */
1.87 +#define Ch(x, y, z) ((x & (y ^ z)) ^ z)
1.88 +#define Maj(x, y, z) ((x & (y | z)) | (y & z))
1.89 +#define SHR(x, n) (x >> n)
1.90 +#define ROTR(x, n) ((x >> n) | (x << (32 - n)))
1.91 +#define S0(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
1.92 +#define S1(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
1.93 +#define s0(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHR(x, 3))
1.94 +#define s1(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHR(x, 10))
1.95 +
1.96 +/* SHA256 round function */
1.97 +#define RND(a, b, c, d, e, f, g, h, k) \
1.98 + t0 = h + S1(e) + Ch(e, f, g) + k; \
1.99 + t1 = S0(a) + Maj(a, b, c); \
1.100 + d += t0; \
1.101 + h = t0 + t1;
1.102 +
1.103 +/* Adjusted round function for rotating state */
1.104 +#define RNDr(S, W, i, k) \
1.105 + RND(S[(64 - i) % 8], S[(65 - i) % 8], \
1.106 + S[(66 - i) % 8], S[(67 - i) % 8], \
1.107 + S[(68 - i) % 8], S[(69 - i) % 8], \
1.108 + S[(70 - i) % 8], S[(71 - i) % 8], \
1.109 + W[i] + k)
1.110 +
1.111 +/*
1.112 + * SHA256 block compression function. The 256-bit state is transformed via
1.113 + * the 512-bit input block to produce a new state.
1.114 + */
1.115 +static void
1.116 +SHA256_Transform(uint32_t * state, const unsigned char block[64])
1.117 +{
1.118 + uint32_t W[64];
1.119 + uint32_t S[8];
1.120 + uint32_t t0, t1;
1.121 + int i;
1.122 +
1.123 + /* 1. Prepare message schedule W. */
1.124 + be32dec_vect(W, block, 64);
1.125 + for (i = 16; i < 64; i++)
1.126 + W[i] = s1(W[i - 2]) + W[i - 7] + s0(W[i - 15]) + W[i - 16];
1.127 +
1.128 + /* 2. Initialize working variables. */
1.129 + memcpy(S, state, 32);
1.130 +
1.131 + /* 3. Mix. */
1.132 + RNDr(S, W, 0, 0x428a2f98);
1.133 + RNDr(S, W, 1, 0x71374491);
1.134 + RNDr(S, W, 2, 0xb5c0fbcf);
1.135 + RNDr(S, W, 3, 0xe9b5dba5);
1.136 + RNDr(S, W, 4, 0x3956c25b);
1.137 + RNDr(S, W, 5, 0x59f111f1);
1.138 + RNDr(S, W, 6, 0x923f82a4);
1.139 + RNDr(S, W, 7, 0xab1c5ed5);
1.140 + RNDr(S, W, 8, 0xd807aa98);
1.141 + RNDr(S, W, 9, 0x12835b01);
1.142 + RNDr(S, W, 10, 0x243185be);
1.143 + RNDr(S, W, 11, 0x550c7dc3);
1.144 + RNDr(S, W, 12, 0x72be5d74);
1.145 + RNDr(S, W, 13, 0x80deb1fe);
1.146 + RNDr(S, W, 14, 0x9bdc06a7);
1.147 + RNDr(S, W, 15, 0xc19bf174);
1.148 + RNDr(S, W, 16, 0xe49b69c1);
1.149 + RNDr(S, W, 17, 0xefbe4786);
1.150 + RNDr(S, W, 18, 0x0fc19dc6);
1.151 + RNDr(S, W, 19, 0x240ca1cc);
1.152 + RNDr(S, W, 20, 0x2de92c6f);
1.153 + RNDr(S, W, 21, 0x4a7484aa);
1.154 + RNDr(S, W, 22, 0x5cb0a9dc);
1.155 + RNDr(S, W, 23, 0x76f988da);
1.156 + RNDr(S, W, 24, 0x983e5152);
1.157 + RNDr(S, W, 25, 0xa831c66d);
1.158 + RNDr(S, W, 26, 0xb00327c8);
1.159 + RNDr(S, W, 27, 0xbf597fc7);
1.160 + RNDr(S, W, 28, 0xc6e00bf3);
1.161 + RNDr(S, W, 29, 0xd5a79147);
1.162 + RNDr(S, W, 30, 0x06ca6351);
1.163 + RNDr(S, W, 31, 0x14292967);
1.164 + RNDr(S, W, 32, 0x27b70a85);
1.165 + RNDr(S, W, 33, 0x2e1b2138);
1.166 + RNDr(S, W, 34, 0x4d2c6dfc);
1.167 + RNDr(S, W, 35, 0x53380d13);
1.168 + RNDr(S, W, 36, 0x650a7354);
1.169 + RNDr(S, W, 37, 0x766a0abb);
1.170 + RNDr(S, W, 38, 0x81c2c92e);
1.171 + RNDr(S, W, 39, 0x92722c85);
1.172 + RNDr(S, W, 40, 0xa2bfe8a1);
1.173 + RNDr(S, W, 41, 0xa81a664b);
1.174 + RNDr(S, W, 42, 0xc24b8b70);
1.175 + RNDr(S, W, 43, 0xc76c51a3);
1.176 + RNDr(S, W, 44, 0xd192e819);
1.177 + RNDr(S, W, 45, 0xd6990624);
1.178 + RNDr(S, W, 46, 0xf40e3585);
1.179 + RNDr(S, W, 47, 0x106aa070);
1.180 + RNDr(S, W, 48, 0x19a4c116);
1.181 + RNDr(S, W, 49, 0x1e376c08);
1.182 + RNDr(S, W, 50, 0x2748774c);
1.183 + RNDr(S, W, 51, 0x34b0bcb5);
1.184 + RNDr(S, W, 52, 0x391c0cb3);
1.185 + RNDr(S, W, 53, 0x4ed8aa4a);
1.186 + RNDr(S, W, 54, 0x5b9cca4f);
1.187 + RNDr(S, W, 55, 0x682e6ff3);
1.188 + RNDr(S, W, 56, 0x748f82ee);
1.189 + RNDr(S, W, 57, 0x78a5636f);
1.190 + RNDr(S, W, 58, 0x84c87814);
1.191 + RNDr(S, W, 59, 0x8cc70208);
1.192 + RNDr(S, W, 60, 0x90befffa);
1.193 + RNDr(S, W, 61, 0xa4506ceb);
1.194 + RNDr(S, W, 62, 0xbef9a3f7);
1.195 + RNDr(S, W, 63, 0xc67178f2);
1.196 +
1.197 + /* 4. Mix local working variables into global state. */
1.198 + for (i = 0; i < 8; i++)
1.199 + state[i] += S[i];
1.200 +
1.201 + /* Clean the stack. */
1.202 + memset(W, 0, 256);
1.203 + memset(S, 0, 32);
1.204 + t0 = t1 = 0;
1.205 +}
1.206 +
1.207 +static unsigned char PAD[64] = {
1.208 + 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1.209 + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1.210 + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1.211 + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
1.212 +};
1.213 +
1.214 +/* Add padding and terminating bit-count. */
1.215 +static void
1.216 +SHA256_Pad(SHA256_CTX * ctx)
1.217 +{
1.218 + unsigned char len[8];
1.219 + uint32_t r, plen;
1.220 +
1.221 + /*
1.222 + * Convert length to a vector of bytes -- we do this now rather
1.223 + * than later because the length will change after we pad.
1.224 + */
1.225 + be32enc_vect(len, ctx->count, 8);
1.226 +
1.227 + /* Add 1--64 bytes so that the resulting length is 56 mod 64. */
1.228 + r = (ctx->count[1] >> 3) & 0x3f;
1.229 + plen = (r < 56) ? (56 - r) : (120 - r);
1.230 + SHA256_Update(ctx, PAD, (size_t)plen);
1.231 +
1.232 + /* Add the terminating bit-count. */
1.233 + SHA256_Update(ctx, len, 8);
1.234 +}
1.235 +
1.236 +/* SHA-256 initialization. Begins a SHA-256 operation. */
1.237 +void
1.238 +SHA256_Init(SHA256_CTX * ctx)
1.239 +{
1.240 +
1.241 + /* Zero bits processed so far. */
1.242 + ctx->count[0] = ctx->count[1] = 0;
1.243 +
1.244 + /* Magic initialization constants. */
1.245 + ctx->state[0] = 0x6A09E667;
1.246 + ctx->state[1] = 0xBB67AE85;
1.247 + ctx->state[2] = 0x3C6EF372;
1.248 + ctx->state[3] = 0xA54FF53A;
1.249 + ctx->state[4] = 0x510E527F;
1.250 + ctx->state[5] = 0x9B05688C;
1.251 + ctx->state[6] = 0x1F83D9AB;
1.252 + ctx->state[7] = 0x5BE0CD19;
1.253 +}
1.254 +
1.255 +/* Add bytes into the hash. */
1.256 +void
1.257 +SHA256_Update(SHA256_CTX * ctx, const void *in, size_t len)
1.258 +{
1.259 + uint32_t bitlen[2];
1.260 + uint32_t r;
1.261 + const unsigned char *src = in;
1.262 +
1.263 + /* Number of bytes left in the buffer from previous updates. */
1.264 + r = (ctx->count[1] >> 3) & 0x3f;
1.265 +
1.266 + /* Convert the length into a number of bits. */
1.267 + bitlen[1] = ((uint32_t)len) << 3;
1.268 + bitlen[0] = (uint32_t)(len >> 29);
1.269 +
1.270 + /* Update number of bits. */
1.271 + if ((ctx->count[1] += bitlen[1]) < bitlen[1])
1.272 + ctx->count[0]++;
1.273 + ctx->count[0] += bitlen[0];
1.274 +
1.275 + /* Handle the case where we don't need to perform any transforms. */
1.276 + if (len < 64 - r) {
1.277 + memcpy(&ctx->buf[r], src, len);
1.278 + return;
1.279 + }
1.280 +
1.281 + /* Finish the current block. */
1.282 + memcpy(&ctx->buf[r], src, 64 - r);
1.283 + SHA256_Transform(ctx->state, ctx->buf);
1.284 + src += 64 - r;
1.285 + len -= 64 - r;
1.286 +
1.287 + /* Perform complete blocks. */
1.288 + while (len >= 64) {
1.289 + SHA256_Transform(ctx->state, src);
1.290 + src += 64;
1.291 + len -= 64;
1.292 + }
1.293 +
1.294 + /* Copy left over data into buffer. */
1.295 + memcpy(ctx->buf, src, len);
1.296 +}
1.297 +
1.298 +/*
1.299 + * SHA-256 finalization. Pads the input data, exports the hash value,
1.300 + * and clears the context state.
1.301 + */
1.302 +void
1.303 +SHA256_Final(unsigned char digest[32], SHA256_CTX * ctx)
1.304 +{
1.305 +
1.306 + /* Add padding. */
1.307 + SHA256_Pad(ctx);
1.308 +
1.309 + /* Write the hash. */
1.310 + be32enc_vect(digest, ctx->state, 32);
1.311 +
1.312 + /* Clear the context state. */
1.313 + memset((void *)ctx, 0, sizeof(*ctx));
1.314 +}
1.315 +
1.316 +/* Initialize an HMAC-SHA256 operation with the given key. */
1.317 +void
1.318 +HMAC_SHA256_Init(HMAC_SHA256_CTX * ctx, const void * _K, size_t Klen)
1.319 +{
1.320 + unsigned char pad[64];
1.321 + unsigned char khash[32];
1.322 + const unsigned char * K = _K;
1.323 + size_t i;
1.324 +
1.325 + /* If Klen > 64, the key is really SHA256(K). */
1.326 + if (Klen > 64) {
1.327 + SHA256_Init(&ctx->ictx);
1.328 + SHA256_Update(&ctx->ictx, K, Klen);
1.329 + SHA256_Final(khash, &ctx->ictx);
1.330 + K = khash;
1.331 + Klen = 32;
1.332 + }
1.333 +
1.334 + /* Inner SHA256 operation is SHA256(K xor [block of 0x36] || data). */
1.335 + SHA256_Init(&ctx->ictx);
1.336 + memset(pad, 0x36, 64);
1.337 + for (i = 0; i < Klen; i++)
1.338 + pad[i] ^= K[i];
1.339 + SHA256_Update(&ctx->ictx, pad, 64);
1.340 +
1.341 + /* Outer SHA256 operation is SHA256(K xor [block of 0x5c] || hash). */
1.342 + SHA256_Init(&ctx->octx);
1.343 + memset(pad, 0x5c, 64);
1.344 + for (i = 0; i < Klen; i++)
1.345 + pad[i] ^= K[i];
1.346 + SHA256_Update(&ctx->octx, pad, 64);
1.347 +
1.348 + /* Clean the stack. */
1.349 + memset(khash, 0, 32);
1.350 +}
1.351 +
1.352 +/* Add bytes to the HMAC-SHA256 operation. */
1.353 +void
1.354 +HMAC_SHA256_Update(HMAC_SHA256_CTX * ctx, const void *in, size_t len)
1.355 +{
1.356 +
1.357 + /* Feed data to the inner SHA256 operation. */
1.358 + SHA256_Update(&ctx->ictx, in, len);
1.359 +}
1.360 +
1.361 +/* Finish an HMAC-SHA256 operation. */
1.362 +void
1.363 +HMAC_SHA256_Final(unsigned char digest[32], HMAC_SHA256_CTX * ctx)
1.364 +{
1.365 + unsigned char ihash[32];
1.366 +
1.367 + /* Finish the inner SHA256 operation. */
1.368 + SHA256_Final(ihash, &ctx->ictx);
1.369 +
1.370 + /* Feed the inner hash to the outer SHA256 operation. */
1.371 + SHA256_Update(&ctx->octx, ihash, 32);
1.372 +
1.373 + /* Finish the outer SHA256 operation. */
1.374 + SHA256_Final(digest, &ctx->octx);
1.375 +
1.376 + /* Clean the stack. */
1.377 + memset(ihash, 0, 32);
1.378 +}
1.379 +
1.380 +/**
1.381 + * PBKDF2_SHA256(passwd, passwdlen, salt, saltlen, c, buf, dkLen):
1.382 + * Compute PBKDF2(passwd, salt, c, dkLen) using HMAC-SHA256 as the PRF, and
1.383 + * write the output to buf. The value dkLen must be at most 32 * (2^32 - 1).
1.384 + */
1.385 +void
1.386 +PBKDF2_SHA256(const uint8_t * passwd, size_t passwdlen, const uint8_t * salt,
1.387 + size_t saltlen, uint64_t c, uint8_t * buf, size_t dkLen)
1.388 +{
1.389 + HMAC_SHA256_CTX PShctx, hctx;
1.390 + size_t i;
1.391 + uint8_t ivec[4];
1.392 + uint8_t U[32];
1.393 + uint8_t T[32];
1.394 + uint64_t j;
1.395 + int k;
1.396 + size_t clen;
1.397 +
1.398 + /* Compute HMAC state after processing P and S. */
1.399 + HMAC_SHA256_Init(&PShctx, passwd, passwdlen);
1.400 + HMAC_SHA256_Update(&PShctx, salt, saltlen);
1.401 +
1.402 + /* Iterate through the blocks. */
1.403 + for (i = 0; i * 32 < dkLen; i++) {
1.404 + /* Generate INT(i + 1). */
1.405 + be32enc(ivec, (uint32_t)(i + 1));
1.406 +
1.407 + /* Compute U_1 = PRF(P, S || INT(i)). */
1.408 + memcpy(&hctx, &PShctx, sizeof(HMAC_SHA256_CTX));
1.409 + HMAC_SHA256_Update(&hctx, ivec, 4);
1.410 + HMAC_SHA256_Final(U, &hctx);
1.411 +
1.412 + /* T_i = U_1 ... */
1.413 + memcpy(T, U, 32);
1.414 +
1.415 + for (j = 2; j <= c; j++) {
1.416 + /* Compute U_j. */
1.417 + HMAC_SHA256_Init(&hctx, passwd, passwdlen);
1.418 + HMAC_SHA256_Update(&hctx, U, 32);
1.419 + HMAC_SHA256_Final(U, &hctx);
1.420 +
1.421 + /* ... xor U_j ... */
1.422 + for (k = 0; k < 32; k++)
1.423 + T[k] ^= U[k];
1.424 + }
1.425 +
1.426 + /* Copy as many bytes as necessary into buf. */
1.427 + clen = dkLen - i * 32;
1.428 + if (clen > 32)
1.429 + clen = 32;
1.430 + memcpy(&buf[i * 32], T, clen);
1.431 + }
1.432 +
1.433 + /* Clean PShctx, since we never called _Final on it. */
1.434 + memset(&PShctx, 0, sizeof(HMAC_SHA256_CTX));
1.435 +}
