1 /* Modified to work on various platforms. -Pekka */
4 By Steve Reid <steve@edmweb.com>
8 #include "silcincludes.h"
9 #include "sha1_internal.h"
13 * SILC Hash API for SHA1
16 SILC_HASH_API_INIT(sha1)
18 SHA1Init((SHA1_CTX *)context);
21 SILC_HASH_API_UPDATE(sha1)
23 SHA1Update((SHA1_CTX *)context, data, len);
26 SILC_HASH_API_FINAL(sha1)
28 SHA1Final(digest, (SHA1_CTX *)context);
31 SILC_HASH_API_TRANSFORM(sha1)
33 SHA1Transform(state, buffer);
36 SILC_HASH_API_CONTEXT_LEN(sha1)
38 return sizeof(SHA1_CTX);
41 void SHA1Init(SHA1_CTX* context)
43 /* SHA1 initialization constants */
44 context->state[0] = 0x67452301L;
45 context->state[1] = 0xEFCDAB89L;
46 context->state[2] = 0x98BADCFEL;
47 context->state[3] = 0x10325476L;
48 context->state[4] = 0xC3D2E1F0L;
49 context->count[0] = context->count[1] = 0;
52 #define rol(x, nr) (((x) << ((uint32)(nr))) | ((x) >> (32 - (uint32)(nr))))
54 #define GET_WORD(cp) ((uint32)(uint8)(cp)[0]) << 24 \
55 | ((uint32)(uint8)(cp)[1] << 16) \
56 | ((uint32)(uint8)(cp)[2] << 8) \
57 | ((uint32)(uint8)(cp)[3])
59 #define blk0(i) (W[i] = GET_WORD(data))
60 #define blk1(i) (W[i&15] = rol(W[(i+13)&15]^W[(i+8)&15]^W[(i+2)&15]^W[i&15],1))
62 #define f1(x,y,z) (z^(x&(y^z)))
63 #define f2(x,y,z) (x^y^z)
64 #define f3(x,y,z) ((x&y)|(z&(x|y)))
65 #define f4(x,y,z) (x^y^z)
67 /* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
68 #define R0(v,w,x,y,z,i) z+=f1(w,x,y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);data+=4;
69 #define R1(v,w,x,y,z,i) z+=f1(w,x,y)+blk1(i)+0x5A827999+rol(v,5);w=rol(w,30);
70 #define R2(v,w,x,y,z,i) z+=f2(w,x,y)+blk1(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
71 #define R3(v,w,x,y,z,i) z+=f3(w,x,y)+blk1(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
72 #define R4(v,w,x,y,z,i) z+=f4(w,x,y)+blk1(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
74 void SHA1Transform(uint32 *state, const unsigned char *data)
78 /* Copy context->state[] to working vars */
85 /* 4 rounds of 20 operations each. Loop unrolled. */
86 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);
87 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);
88 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);
89 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);
90 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);
91 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);
92 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);
93 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);
94 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);
95 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);
96 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);
97 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);
98 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);
99 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);
100 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);
101 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);
102 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);
103 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);
104 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);
105 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);
107 /* Add the working vars back into context.state[] */
115 a = b = c = d = e = 0;
116 memset(W, 0, sizeof(W));
119 /* Run your data through this. */
121 void SHA1Update(SHA1_CTX* context, unsigned char* data, uint32 len)
125 j = (context->count[0] >> 3) & 63;
126 if ((context->count[0] += len << 3) < (len << 3)) context->count[1]++;
127 context->count[1] += (len >> 29);
128 if ((j + len) > 63) {
129 memcpy(&context->buffer[j], data, (i = 64-j));
130 SHA1Transform(context->state, context->buffer);
131 for ( ; i + 63 < len; i += 64) {
132 SHA1Transform(context->state, &data[i]);
137 memcpy(&context->buffer[j], &data[i], len - i);
140 /* Add padding and return the message digest. */
142 void SHA1Final(unsigned char digest[20], SHA1_CTX* context)
145 unsigned char finalcount[8];
147 for (i = 0; i < 8; i++) {
148 finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
149 >> ((3 - (i & 3)) * 8)) & 255);
151 SHA1Update(context, (unsigned char *)"\200", 1);
152 while ((context->count[0] & 504) != 448) {
153 SHA1Update(context, (unsigned char *)"\0", 1);
156 SHA1Update(context, finalcount, 8); /* Should cause a SHA1Transform() */
157 for (i = 0; i < 20; i++) {
158 digest[i] = (unsigned char)
159 ((context->state[i>>2] >> ((3 - (i & 3)) * 8)) & 255);
164 memset(context->buffer, 0, 64);
165 memset(context->state, 0, 20);
166 memset(context->count, 0, 8);
167 memset(finalcount, 0, 8);
168 SHA1Transform(context->state, context->buffer);