💾 Archived View for gemini.rmf-dev.com › repo › Vaati › JailWarden › files › 955c3c5ddfbb31bffabe51d… captured on 2023-09-28 at 16:37:44. Gemini links have been rewritten to link to archived content
⬅️ Previous capture (2023-09-08)
-=-=-=-=-=-=-
0 /*
1 * This sha256 implementation is in the public domain
2 * and is provided AS IS, with NO WARRANTY.
3 */
4 #include <stdlib.h>
5 #include <memory.h>
6 #include "sha256.h"
7
8 #define ROTLEFT(a,b) (((a) << (b)) | ((a) >> (32-(b))))
9 #define ROTRIGHT(a,b) (((a) >> (b)) | ((a) << (32-(b))))
10
11 #define CH(x,y,z) (((x) & (y)) ^ (~(x) & (z)))
12 #define MAJ(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
13 #define EP0(x) (ROTRIGHT(x,2) ^ ROTRIGHT(x,13) ^ ROTRIGHT(x,22))
14 #define EP1(x) (ROTRIGHT(x,6) ^ ROTRIGHT(x,11) ^ ROTRIGHT(x,25))
15 #define SIG0(x) (ROTRIGHT(x,7) ^ ROTRIGHT(x,18) ^ ((x) >> 3))
16 #define SIG1(x) (ROTRIGHT(x,17) ^ ROTRIGHT(x,19) ^ ((x) >> 10))
17
18 static const unsigned int k[64] = {
19 0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5,0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5,
20 0xd807aa98,0x12835b01,0x243185be,0x550c7dc3,0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174,
21 0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc,0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da,
22 0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7,0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967,
23 0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13,0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85,
24 0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3,0xd192e819,0xd6990624,0xf40e3585,0x106aa070,
25 0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5,0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3,
26 0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208,0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2
27 };
28
29 void sha256_transform(sha256_ctx*ctx, unsigned char* data)
30 {
31 unsigned int a, b, c, d, e, f, g, h, i, j, t1, t2, m[64];
32
33 for (i = 0, j = 0; i < 16; ++i, j += 4)
34 m[i] = (data[j] << 24) | (data[j + 1] << 16) | (data[j + 2] << 8) | (data[j + 3]);
35 for ( ; i < 64; ++i)
36 m[i] = SIG1(m[i - 2]) + m[i - 7] + SIG0(m[i - 15]) + m[i - 16];
37
38 a = ctx->state[0];
39 b = ctx->state[1];
40 c = ctx->state[2];
41 d = ctx->state[3];
42 e = ctx->state[4];
43 f = ctx->state[5];
44 g = ctx->state[6];
45 h = ctx->state[7];
46
47 for (i = 0; i < 64; ++i) {
48 t1 = h + EP1(e) + CH(e,f,g) + k[i] + m[i];
49 t2 = EP0(a) + MAJ(a,b,c);
50 h = g;
51 g = f;
52 f = e;
53 e = d + t1;
54 d = c;
55 c = b;
56 b = a;
57 a = t1 + t2;
58 }
59
60 ctx->state[0] += a;
61 ctx->state[1] += b;
62 ctx->state[2] += c;
63 ctx->state[3] += d;
64 ctx->state[4] += e;
65 ctx->state[5] += f;
66 ctx->state[6] += g;
67 ctx->state[7] += h;
68 }
69
70 void sha256_init(sha256_ctx *ctx)
71 {
72 ctx->datalen = 0;
73 ctx->bitlen = 0;
74 ctx->state[0] = 0x6a09e667;
75 ctx->state[1] = 0xbb67ae85;
76 ctx->state[2] = 0x3c6ef372;
77 ctx->state[3] = 0xa54ff53a;
78 ctx->state[4] = 0x510e527f;
79 ctx->state[5] = 0x9b05688c;
80 ctx->state[6] = 0x1f83d9ab;
81 ctx->state[7] = 0x5be0cd19;
82 }
83
84 void sha256_update(sha256_ctx* ctx, unsigned char* data, unsigned int len)
85 {
86 for(unsigned int i = 0; i < len; ++i) {
87 ctx->data[ctx->datalen] = data[i];
88 ctx->datalen++;
89 if(ctx->datalen == 64) {
90 sha256_transform(ctx, ctx->data);
91 ctx->bitlen += 512;
92 ctx->datalen = 0;
93 }
94 }
95 }
96
97 void sha256_final(sha256_ctx* ctx, unsigned char* hash)
98 {
99 unsigned int i = ctx->datalen;
100
101 if (ctx->datalen < 56) {
102 ctx->data[i++] = 0x80;
103 while (i < 56)
104 ctx->data[i++] = 0x00;
105 }
106 else {
107 ctx->data[i++] = 0x80;
108 while (i < 64)
109 ctx->data[i++] = 0x00;
110 sha256_transform(ctx, ctx->data);
111 memset(ctx->data, 0, 56);
112 }
113
114 ctx->bitlen += ctx->datalen * 8;
115 ctx->data[63] = ctx->bitlen;
116 ctx->data[62] = ctx->bitlen >> 8;
117 ctx->data[61] = ctx->bitlen >> 16;
118 ctx->data[60] = ctx->bitlen >> 24;
119 ctx->data[59] = ctx->bitlen >> 32;
120 ctx->data[58] = ctx->bitlen >> 40;
121 ctx->data[57] = ctx->bitlen >> 48;
122 ctx->data[56] = ctx->bitlen >> 56;
123 sha256_transform(ctx, ctx->data);
124
125 for (i = 0; i < 4; ++i) {
126 hash[i] = (ctx->state[0] >> (24 - i * 8)) & 0x000000ff;
127 hash[i + 4] = (ctx->state[1] >> (24 - i * 8)) & 0x000000ff;
128 hash[i + 8] = (ctx->state[2] >> (24 - i * 8)) & 0x000000ff;
129 hash[i + 12] = (ctx->state[3] >> (24 - i * 8)) & 0x000000ff;
130 hash[i + 16] = (ctx->state[4] >> (24 - i * 8)) & 0x000000ff;
131 hash[i + 20] = (ctx->state[5] >> (24 - i * 8)) & 0x000000ff;
132 hash[i + 24] = (ctx->state[6] >> (24 - i * 8)) & 0x000000ff;
133 hash[i + 28] = (ctx->state[7] >> (24 - i * 8)) & 0x000000ff;
134 }
135 }
136
137 #include <stdio.h>
138 int sha256_file(char* path, unsigned char* buf) {
139 FILE* f = fopen(path, "rb");
140 if(!f) return -1;
141 fseek(f, 0, SEEK_END);
142 unsigned long long len = ftell(f);
143 fseek(f, 0, SEEK_SET);
144 if(len>1024*1024*1024) return -2;
145 unsigned char* data = malloc(len);
146 fread(data, 1, len, f);
147 fclose(f);
148 sha256_ctx ctx;
149 sha256_init(&ctx);
150 sha256_update(&ctx, data, len);
151 sha256_final(&ctx, buf);
152 free(data);
153 return 0;
154 }
155