1 /* 2 * SHA-256 hash implementation and interface functions 3 * Copyright (c) 2003-2011, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "includes.h" 10 11 #include "common.h" 12 #include "sha256.h" 13 #include "sha256_i.h" 14 #include "crypto.h" 15 16 17 /** 18 * sha256_vector - SHA256 hash for data vector 19 * @num_elem: Number of elements in the data vector 20 * @addr: Pointers to the data areas 21 * @len: Lengths of the data blocks 22 * @mac: Buffer for the hash 23 * Returns: 0 on success, -1 of failure 24 */ 25 int sha256_vector(size_t num_elem, const u8 *addr[], const size_t *len, 26 u8 *mac) 27 { 28 struct sha256_state ctx; 29 size_t i; 30 31 if (TEST_FAIL()) 32 return -1; 33 34 sha256_init(&ctx); 35 for (i = 0; i < num_elem; i++) 36 if (sha256_process(&ctx, addr[i], len[i])) 37 return -1; 38 if (sha256_done(&ctx, mac)) 39 return -1; 40 return 0; 41 } 42 43 44 /* ===== start - public domain SHA256 implementation ===== */ 45 46 /* This is based on SHA256 implementation in LibTomCrypt that was released into 47 * public domain by Tom St Denis. */ 48 49 /* the K array */ 50 static const unsigned long K[64] = { 51 0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL, 0x3956c25bUL, 52 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL, 0xd807aa98UL, 0x12835b01UL, 53 0x243185beUL, 0x550c7dc3UL, 0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL, 54 0xc19bf174UL, 0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL, 55 0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL, 0x983e5152UL, 56 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL, 0xc6e00bf3UL, 0xd5a79147UL, 57 0x06ca6351UL, 0x14292967UL, 0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL, 58 0x53380d13UL, 0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL, 59 0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL, 0xd192e819UL, 60 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL, 0x19a4c116UL, 0x1e376c08UL, 61 0x2748774cUL, 0x34b0bcb5UL, 0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL, 62 0x682e6ff3UL, 0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL, 63 0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL 64 }; 65 66 67 /* Various logical functions */ 68 #define RORc(x, y) \ 69 ( ((((unsigned long) (x) & 0xFFFFFFFFUL) >> (unsigned long) ((y) & 31)) | \ 70 ((unsigned long) (x) << (unsigned long) (32 - ((y) & 31)))) & 0xFFFFFFFFUL) 71 #define Ch(x,y,z) (z ^ (x & (y ^ z))) 72 #define Maj(x,y,z) (((x | y) & z) | (x & y)) 73 #define S(x, n) RORc((x), (n)) 74 #define R(x, n) (((x)&0xFFFFFFFFUL)>>(n)) 75 #define Sigma0(x) (S(x, 2) ^ S(x, 13) ^ S(x, 22)) 76 #define Sigma1(x) (S(x, 6) ^ S(x, 11) ^ S(x, 25)) 77 #define Gamma0(x) (S(x, 7) ^ S(x, 18) ^ R(x, 3)) 78 #define Gamma1(x) (S(x, 17) ^ S(x, 19) ^ R(x, 10)) 79 #ifndef MIN 80 #define MIN(x, y) (((x) < (y)) ? (x) : (y)) 81 #endif 82 83 /* compress 512-bits */ 84 static int sha256_compress(struct sha256_state *md, unsigned char *buf) 85 { 86 u32 S[8], W[64], t0, t1; 87 u32 t; 88 int i; 89 90 /* copy state into S */ 91 for (i = 0; i < 8; i++) { 92 S[i] = md->state[i]; 93 } 94 95 /* copy the state into 512-bits into W[0..15] */ 96 for (i = 0; i < 16; i++) 97 W[i] = WPA_GET_BE32(buf + (4 * i)); 98 99 /* fill W[16..63] */ 100 for (i = 16; i < 64; i++) { 101 W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) + 102 W[i - 16]; 103 } 104 105 /* Compress */ 106 #define RND(a,b,c,d,e,f,g,h,i) \ 107 t0 = h + Sigma1(e) + Ch(e, f, g) + K[i] + W[i]; \ 108 t1 = Sigma0(a) + Maj(a, b, c); \ 109 d += t0; \ 110 h = t0 + t1; 111 112 for (i = 0; i < 64; ++i) { 113 RND(S[0], S[1], S[2], S[3], S[4], S[5], S[6], S[7], i); 114 t = S[7]; S[7] = S[6]; S[6] = S[5]; S[5] = S[4]; 115 S[4] = S[3]; S[3] = S[2]; S[2] = S[1]; S[1] = S[0]; S[0] = t; 116 } 117 118 /* feedback */ 119 for (i = 0; i < 8; i++) { 120 md->state[i] = md->state[i] + S[i]; 121 } 122 return 0; 123 } 124 125 126 /* Initialize the hash state */ 127 void sha256_init(struct sha256_state *md) 128 { 129 md->curlen = 0; 130 md->length = 0; 131 md->state[0] = 0x6A09E667UL; 132 md->state[1] = 0xBB67AE85UL; 133 md->state[2] = 0x3C6EF372UL; 134 md->state[3] = 0xA54FF53AUL; 135 md->state[4] = 0x510E527FUL; 136 md->state[5] = 0x9B05688CUL; 137 md->state[6] = 0x1F83D9ABUL; 138 md->state[7] = 0x5BE0CD19UL; 139 } 140 141 /** 142 Process a block of memory though the hash 143 @param md The hash state 144 @param in The data to hash 145 @param inlen The length of the data (octets) 146 @return CRYPT_OK if successful 147 */ 148 int sha256_process(struct sha256_state *md, const unsigned char *in, 149 unsigned long inlen) 150 { 151 unsigned long n; 152 153 if (md->curlen >= sizeof(md->buf)) 154 return -1; 155 156 while (inlen > 0) { 157 if (md->curlen == 0 && inlen >= SHA256_BLOCK_SIZE) { 158 if (sha256_compress(md, (unsigned char *) in) < 0) 159 return -1; 160 md->length += SHA256_BLOCK_SIZE * 8; 161 in += SHA256_BLOCK_SIZE; 162 inlen -= SHA256_BLOCK_SIZE; 163 } else { 164 n = MIN(inlen, (SHA256_BLOCK_SIZE - md->curlen)); 165 os_memcpy(md->buf + md->curlen, in, n); 166 md->curlen += n; 167 in += n; 168 inlen -= n; 169 if (md->curlen == SHA256_BLOCK_SIZE) { 170 if (sha256_compress(md, md->buf) < 0) 171 return -1; 172 md->length += 8 * SHA256_BLOCK_SIZE; 173 md->curlen = 0; 174 } 175 } 176 } 177 178 return 0; 179 } 180 181 182 /** 183 Terminate the hash to get the digest 184 @param md The hash state 185 @param out [out] The destination of the hash (32 bytes) 186 @return CRYPT_OK if successful 187 */ 188 int sha256_done(struct sha256_state *md, unsigned char *out) 189 { 190 int i; 191 192 if (md->curlen >= sizeof(md->buf)) 193 return -1; 194 195 /* increase the length of the message */ 196 md->length += md->curlen * 8; 197 198 /* append the '1' bit */ 199 md->buf[md->curlen++] = (unsigned char) 0x80; 200 201 /* if the length is currently above 56 bytes we append zeros 202 * then compress. Then we can fall back to padding zeros and length 203 * encoding like normal. 204 */ 205 if (md->curlen > 56) { 206 while (md->curlen < SHA256_BLOCK_SIZE) { 207 md->buf[md->curlen++] = (unsigned char) 0; 208 } 209 sha256_compress(md, md->buf); 210 md->curlen = 0; 211 } 212 213 /* pad up to 56 bytes of zeroes */ 214 while (md->curlen < 56) { 215 md->buf[md->curlen++] = (unsigned char) 0; 216 } 217 218 /* store length */ 219 WPA_PUT_BE64(md->buf + 56, md->length); 220 sha256_compress(md, md->buf); 221 222 /* copy output */ 223 for (i = 0; i < 8; i++) 224 WPA_PUT_BE32(out + (4 * i), md->state[i]); 225 226 return 0; 227 } 228 229 /* ===== end - public domain SHA256 implementation ===== */ 230
