YAZ  5.23.1
wrbuf_sha1.c
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1 /* This file is part of the YAZ toolkit.
2  * Copyright (C) Index Data
3  * See the file LICENSE for details.
4  */
5 
11 #if HAVE_CONFIG_H
12 #include <config.h>
13 #endif
14 
15 #include <stdio.h>
16 #include <stdlib.h>
17 #include <string.h>
18 
19 #include <yaz/wrbuf.h>
20 
21 /*
22 SHA-1 in C
23 By Steve Reid <steve@edmweb.com>
24 100% Public Domain
25 */
26 
27 /* #define SHA1HANDSOFF * Copies data before messing with it. */
28 
29 #define SHA1HANDSOFF
30 
31 /* VS 2010 and later have stdint.h */
32 #if defined(_MSC_VER) && _MSC_VER < 1600
33 typedef unsigned int uint32_t;
34 #else
35 #include <stdint.h>
36 #endif
37 
38 typedef struct {
39  uint32_t state[5];
40  uint32_t count[2];
41  unsigned char buffer[64];
42 } SHA1_CTX;
43 
44 #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
45 
46 /* blk0() and blk() perform the initial expand. */
47 /* I got the idea of expanding during the round function from SSLeay */
48 #if WORDS_BIGENDIAN
49 #define blk0(i) block->l[i]
50 #else
51 #define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
52  |(rol(block->l[i],8)&0x00FF00FF))
53 #endif
54 #define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
55  ^block->l[(i+2)&15]^block->l[i&15],1))
56 
57 /* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
58 #define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
59 #define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
60 #define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
61 #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
62 #define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
63 
64 
65 /* Hash a single 512-bit block. This is the core of the algorithm. */
66 
67 static void SHA1Transform(uint32_t state[5], const unsigned char buffer[64])
68 {
69  uint32_t a, b, c, d, e;
70  typedef union {
71  unsigned char c[64];
72  uint32_t l[16];
73  } CHAR64LONG16;
74 #ifdef SHA1HANDSOFF
75  CHAR64LONG16 block[1]; /* use array to appear as a pointer */
76  memcpy(block, buffer, 64);
77 #else
78  /* The following had better never be used because it causes the
79  * pointer-to-const buffer to be cast into a pointer to non-const.
80  * And the result is written through. I threw a "const" in, hoping
81  * this will cause a diagnostic.
82  */
83  CHAR64LONG16* block = (const CHAR64LONG16*)buffer;
84 #endif
85  /* Copy context->state[] to working vars */
86  a = state[0];
87  b = state[1];
88  c = state[2];
89  d = state[3];
90  e = state[4];
91  /* 4 rounds of 20 operations each. Loop unrolled. */
92  R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
93  R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
94  R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
95  R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
96  R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
97  R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
98  R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
99  R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
100  R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
101  R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
102  R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
103  R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
104  R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
105  R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
106  R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
107  R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
108  R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
109  R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
110  R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
111  R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
112  /* Add the working vars back into context.state[] */
113  state[0] += a;
114  state[1] += b;
115  state[2] += c;
116  state[3] += d;
117  state[4] += e;
118  /* Wipe variables */
119  a = b = c = d = e = 0;
120 #ifdef SHA1HANDSOFF
121  memset(block, '\0', sizeof(block));
122 #endif
123 }
124 
125 
126 /* SHA1Init - Initialize new context */
127 
128 static void SHA1Init(SHA1_CTX* context)
129 {
130  /* SHA1 initialization constants */
131  context->state[0] = 0x67452301;
132  context->state[1] = 0xEFCDAB89;
133  context->state[2] = 0x98BADCFE;
134  context->state[3] = 0x10325476;
135  context->state[4] = 0xC3D2E1F0;
136  context->count[0] = context->count[1] = 0;
137 }
138 
139 
140 /* Run your data through this. */
141 
142 static void SHA1Update(SHA1_CTX* context, const unsigned char* data, uint32_t len)
143 {
144  uint32_t i;
145  uint32_t j;
146 
147  j = context->count[0];
148  if ((context->count[0] += len << 3) < j)
149  context->count[1]++;
150  context->count[1] += (len>>29);
151  j = (j >> 3) & 63;
152  if ((j + len) > 63) {
153  memcpy(&context->buffer[j], data, (i = 64-j));
154  SHA1Transform(context->state, context->buffer);
155  for ( ; i + 63 < len; i += 64) {
156  SHA1Transform(context->state, &data[i]);
157  }
158  j = 0;
159  }
160  else i = 0;
161  memcpy(&context->buffer[j], &data[i], len - i);
162 }
163 
164 
165 /* Add padding and return the message digest. */
166 
167 static void SHA1Final(unsigned char digest[20], SHA1_CTX* context)
168 {
169  unsigned i;
170  unsigned char finalcount[8];
171  unsigned char c;
172 
173  for (i = 0; i < 8; i++) {
174  finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
175  >> ((3-(i & 3)) * 8) ) & 255); /* Endian independent */
176  }
177  c = 0200;
178  SHA1Update(context, &c, 1);
179  while ((context->count[0] & 504) != 448) {
180  c = 0000;
181  SHA1Update(context, &c, 1);
182  }
183  SHA1Update(context, finalcount, 8); /* Should cause a SHA1Transform() */
184  for (i = 0; i < 20; i++) {
185  digest[i] = (unsigned char)
186  ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
187  }
188  /* Wipe variables */
189  memset(context, '\0', sizeof(*context));
190  memset(&finalcount, '\0', sizeof(finalcount));
191 }
192 
193 
194 int wrbuf_sha1_write(WRBUF b, const char *cp, size_t sz, int hexit)
195 {
196  unsigned char digest[20];
197  SHA1_CTX ctx;
198 
199  SHA1Init(&ctx);
200  SHA1Update(&ctx, (unsigned char *) cp, sz);
201  SHA1Final(digest, &ctx);
202 
203  if (hexit)
204  {
205  int i;
206  for (i = 0; i < 20; i++)
207  wrbuf_printf(b, "%02x", digest[i]);
208  }
209  else
210  wrbuf_write(b, (const char *) digest, 20);
211  return 0;
212 }
213 
214 int wrbuf_sha1_puts(WRBUF b, const char *cp, int hexit)
215 {
216  return wrbuf_sha1_write(b, cp, strlen(cp), hexit);
217 }
218 
219 /*
220  * Local variables:
221  * c-basic-offset: 4
222  * c-file-style: "Stroustrup"
223  * indent-tabs-mode: nil
224  * End:
225  * vim: shiftwidth=4 tabstop=8 expandtab
226  */
unsigned char buffer[64]
Definition: wrbuf_sha1.c:41
Header for WRBUF (growing buffer)
uint32_t state[5]
Definition: wrbuf_sha1.c:39
void wrbuf_write(WRBUF b, const char *buf, size_t size)
append constant size buffer to WRBUF
Definition: wrbuf.c:68
string buffer
Definition: wrbuf.h:42
static void SHA1Transform(uint32_t state[5], const unsigned char buffer[64])
Definition: wrbuf_sha1.c:67
static void SHA1Update(SHA1_CTX *context, const unsigned char *data, uint32_t len)
Definition: wrbuf_sha1.c:142
static void SHA1Final(unsigned char digest[20], SHA1_CTX *context)
Definition: wrbuf_sha1.c:167
int wrbuf_sha1_puts(WRBUF b, const char *cp, int hexit)
writes SHA1 text to WRBUF
Definition: wrbuf_sha1.c:214
void wrbuf_printf(WRBUF b, const char *fmt,...)
writes printf result to WRBUF
Definition: wrbuf.c:178
#define R2(v, w, x, y, z, i)
Definition: wrbuf_sha1.c:60
uint32_t count[2]
Definition: wrbuf_sha1.c:40
int wrbuf_sha1_write(WRBUF b, const char *cp, size_t sz, int hexit)
writes SHA1 text to WRBUF
Definition: wrbuf_sha1.c:194
static void SHA1Init(SHA1_CTX *context)
Definition: wrbuf_sha1.c:128
#define R0(v, w, x, y, z, i)
Definition: wrbuf_sha1.c:58
#define R1(v, w, x, y, z, i)
Definition: wrbuf_sha1.c:59
#define R3(v, w, x, y, z, i)
Definition: wrbuf_sha1.c:61
#define R4(v, w, x, y, z, i)
Definition: wrbuf_sha1.c:62