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