1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2016, Florin Petriuc, <petriuc.florin@gmail.com>
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.haxx.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 ***************************************************************************/
22
23 #include "curl_setup.h"
24
25 #ifndef CURL_DISABLE_CRYPTO_AUTH
26
27 #include "warnless.h"
28 #include "curl_sha256.h"
29
30 #if defined(USE_OPENSSL)
31
32 /* When OpenSSL is available we use the SHA256-function from OpenSSL */
33 #include <openssl/sha.h>
34
35 #else
36
37 /* When no other crypto library is available we use this code segment */
38
39 /* ===== start - public domain SHA256 implementation ===== */
40 /* This is based on SHA256 implementation in LibTomCrypt that was released into
41 * public domain by Tom St Denis. */
42
43 #define WPA_GET_BE32(a) ((((unsigned long)(a)[0]) << 24) | \
44 (((unsigned long)(a)[1]) << 16) | \
45 (((unsigned long)(a)[2]) << 8) | \
46 ((unsigned long)(a)[3]))
47 #define WPA_PUT_BE32(a, val) \
48 do { \
49 (a)[0] = (unsigned char)((((unsigned long) (val)) >> 24) & 0xff); \
50 (a)[1] = (unsigned char)((((unsigned long) (val)) >> 16) & 0xff); \
51 (a)[2] = (unsigned char)((((unsigned long) (val)) >> 8) & 0xff); \
52 (a)[3] = (unsigned char)(((unsigned long) (val)) & 0xff); \
53 } while(0)
54
55 #ifdef HAVE_LONGLONG
56 #define WPA_PUT_BE64(a, val) \
57 do { \
58 (a)[0] = (unsigned char)(((unsigned long long)(val)) >> 56); \
59 (a)[1] = (unsigned char)(((unsigned long long)(val)) >> 48); \
60 (a)[2] = (unsigned char)(((unsigned long long)(val)) >> 40); \
61 (a)[3] = (unsigned char)(((unsigned long long)(val)) >> 32); \
62 (a)[4] = (unsigned char)(((unsigned long long)(val)) >> 24); \
63 (a)[5] = (unsigned char)(((unsigned long long)(val)) >> 16); \
64 (a)[6] = (unsigned char)(((unsigned long long)(val)) >> 8); \
65 (a)[7] = (unsigned char)(((unsigned long long)(val)) & 0xff); \
66 } while(0)
67 #else
68 #define WPA_PUT_BE64(a, val) \
69 do { \
70 (a)[0] = (unsigned char)(((unsigned __int64)(val)) >> 56); \
71 (a)[1] = (unsigned char)(((unsigned __int64)(val)) >> 48); \
72 (a)[2] = (unsigned char)(((unsigned __int64)(val)) >> 40); \
73 (a)[3] = (unsigned char)(((unsigned __int64)(val)) >> 32); \
74 (a)[4] = (unsigned char)(((unsigned __int64)(val)) >> 24); \
75 (a)[5] = (unsigned char)(((unsigned __int64)(val)) >> 16); \
76 (a)[6] = (unsigned char)(((unsigned __int64)(val)) >> 8); \
77 (a)[7] = (unsigned char)(((unsigned __int64)(val)) & 0xff); \
78 } while(0)
79 #endif
80
81 typedef struct sha256_state {
82 #ifdef HAVE_LONGLONG
83 unsigned long long length;
84 #else
85 unsigned __int64 length;
86 #endif
87 unsigned long state[8], curlen;
88 unsigned char buf[64];
89 } SHA256_CTX;
90 /* the K array */
91 static const unsigned long K[64] = {
92 0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL, 0x3956c25bUL,
93 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL, 0xd807aa98UL, 0x12835b01UL,
94 0x243185beUL, 0x550c7dc3UL, 0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL,
95 0xc19bf174UL, 0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL,
96 0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL, 0x983e5152UL,
97 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL, 0xc6e00bf3UL, 0xd5a79147UL,
98 0x06ca6351UL, 0x14292967UL, 0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL,
99 0x53380d13UL, 0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
100 0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL, 0xd192e819UL,
101 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL, 0x19a4c116UL, 0x1e376c08UL,
102 0x2748774cUL, 0x34b0bcb5UL, 0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL,
103 0x682e6ff3UL, 0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,
104 0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL
105 };
106 /* Various logical functions */
107 #define RORc(x, y) \
108 (((((unsigned long)(x) & 0xFFFFFFFFUL) >> (unsigned long)((y) & 31)) | \
109 ((unsigned long)(x) << (unsigned long)(32 - ((y) & 31)))) & 0xFFFFFFFFUL)
110 #define Ch(x,y,z) (z ^ (x & (y ^ z)))
111 #define Maj(x,y,z) (((x | y) & z) | (x & y))
112 #define S(x, n) RORc((x), (n))
113 #define R(x, n) (((x)&0xFFFFFFFFUL)>>(n))
114 #define Sigma0(x) (S(x, 2) ^ S(x, 13) ^ S(x, 22))
115 #define Sigma1(x) (S(x, 6) ^ S(x, 11) ^ S(x, 25))
116 #define Gamma0(x) (S(x, 7) ^ S(x, 18) ^ R(x, 3))
117 #define Gamma1(x) (S(x, 17) ^ S(x, 19) ^ R(x, 10))
118 #ifndef MIN
119 #define MIN(x, y) (((x) < (y)) ? (x) : (y))
120 #endif
121 /* compress 512-bits */
sha256_compress(struct sha256_state * md,unsigned char * buf)122 static int sha256_compress(struct sha256_state *md,
123 unsigned char *buf)
124 {
125 unsigned long S[8], W[64], t0, t1;
126 unsigned long t;
127 int i;
128 /* copy state into S */
129 for(i = 0; i < 8; i++) {
130 S[i] = md->state[i];
131 }
132 /* copy the state into 512-bits into W[0..15] */
133 for(i = 0; i < 16; i++)
134 W[i] = WPA_GET_BE32(buf + (4 * i));
135 /* fill W[16..63] */
136 for(i = 16; i < 64; i++) {
137 W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) +
138 W[i - 16];
139 }
140 /* Compress */
141 #define RND(a,b,c,d,e,f,g,h,i) \
142 t0 = h + Sigma1(e) + Ch(e, f, g) + K[i] + W[i]; \
143 t1 = Sigma0(a) + Maj(a, b, c); \
144 d += t0; \
145 h = t0 + t1;
146 for(i = 0; i < 64; ++i) {
147 RND(S[0], S[1], S[2], S[3], S[4], S[5], S[6], S[7], i);
148 t = S[7]; S[7] = S[6]; S[6] = S[5]; S[5] = S[4];
149 S[4] = S[3]; S[3] = S[2]; S[2] = S[1]; S[1] = S[0]; S[0] = t;
150 }
151 /* feedback */
152 for(i = 0; i < 8; i++) {
153 md->state[i] = md->state[i] + S[i];
154 }
155 return 0;
156 }
157 /* Initialize the hash state */
SHA256_Init(struct sha256_state * md)158 static void SHA256_Init(struct sha256_state *md)
159 {
160 md->curlen = 0;
161 md->length = 0;
162 md->state[0] = 0x6A09E667UL;
163 md->state[1] = 0xBB67AE85UL;
164 md->state[2] = 0x3C6EF372UL;
165 md->state[3] = 0xA54FF53AUL;
166 md->state[4] = 0x510E527FUL;
167 md->state[5] = 0x9B05688CUL;
168 md->state[6] = 0x1F83D9ABUL;
169 md->state[7] = 0x5BE0CD19UL;
170 }
171 /**
172 Process a block of memory though the hash
173 @param md The hash state
174 @param in The data to hash
175 @param inlen The length of the data (octets)
176 @return CRYPT_OK if successful
177 */
SHA256_Update(struct sha256_state * md,const unsigned char * in,unsigned long inlen)178 static int SHA256_Update(struct sha256_state *md,
179 const unsigned char *in,
180 unsigned long inlen)
181 {
182 unsigned long n;
183 #define block_size 64
184 if(md->curlen > sizeof(md->buf))
185 return -1;
186 while(inlen > 0) {
187 if(md->curlen == 0 && inlen >= block_size) {
188 if(sha256_compress(md, (unsigned char *)in) < 0)
189 return -1;
190 md->length += block_size * 8;
191 in += block_size;
192 inlen -= block_size;
193 }
194 else {
195 n = MIN(inlen, (block_size - md->curlen));
196 memcpy(md->buf + md->curlen, in, n);
197 md->curlen += n;
198 in += n;
199 inlen -= n;
200 if(md->curlen == block_size) {
201 if(sha256_compress(md, md->buf) < 0)
202 return -1;
203 md->length += 8 * block_size;
204 md->curlen = 0;
205 }
206 }
207 }
208 return 0;
209 }
210 /**
211 Terminate the hash to get the digest
212 @param md The hash state
213 @param out [out] The destination of the hash (32 bytes)
214 @return CRYPT_OK if successful
215 */
SHA256_Final(unsigned char * out,struct sha256_state * md)216 static int SHA256_Final(unsigned char *out,
217 struct sha256_state *md)
218 {
219 int i;
220 if(md->curlen >= sizeof(md->buf))
221 return -1;
222 /* increase the length of the message */
223 md->length += md->curlen * 8;
224 /* append the '1' bit */
225 md->buf[md->curlen++] = (unsigned char)0x80;
226 /* if the length is currently above 56 bytes we append zeros
227 * then compress. Then we can fall back to padding zeros and length
228 * encoding like normal.
229 */
230 if(md->curlen > 56) {
231 while(md->curlen < 64) {
232 md->buf[md->curlen++] = (unsigned char)0;
233 }
234 sha256_compress(md, md->buf);
235 md->curlen = 0;
236 }
237 /* pad upto 56 bytes of zeroes */
238 while(md->curlen < 56) {
239 md->buf[md->curlen++] = (unsigned char)0;
240 }
241 /* store length */
242 WPA_PUT_BE64(md->buf + 56, md->length);
243 sha256_compress(md, md->buf);
244 /* copy output */
245 for(i = 0; i < 8; i++)
246 WPA_PUT_BE32(out + (4 * i), md->state[i]);
247 return 0;
248 }
249 /* ===== end - public domain SHA256 implementation ===== */
250
251 #endif
252
Curl_sha256it(unsigned char * outbuffer,const unsigned char * input)253 void Curl_sha256it(unsigned char *outbuffer, /* 32 unsigned chars */
254 const unsigned char *input)
255 {
256 SHA256_CTX ctx;
257 SHA256_Init(&ctx);
258 SHA256_Update(&ctx, input, curlx_uztoui(strlen((char *)input)));
259 SHA256_Final(outbuffer, &ctx);
260 }
261
262 #endif /* CURL_DISABLE_CRYPTO_AUTH */
263