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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