Annotation of embedaddon/axTLS/crypto/md2.c, revision 1.1.1.1
1.1 misho 1: /*
2: * Copyright (c) 2007, Cameron Rich
3: *
4: * All rights reserved.
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions are met:
8: *
9: * * Redistributions of source code must retain the above copyright notice,
10: * this list of conditions and the following disclaimer.
11: * * Redistributions in binary form must reproduce the above copyright notice,
12: * this list of conditions and the following disclaimer in the documentation
13: * and/or other materials provided with the distribution.
14: * * Neither the name of the axTLS project nor the names of its contributors
15: * may be used to endorse or promote products derived from this software
16: * without specific prior written permission.
17: *
18: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21: * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
22: * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
25: * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
26: * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
27: * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28: * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29: */
30:
31: /*
32: * RFC 1115/1319 compliant MD2 implementation
33: * The MD2 algorithm was designed by Ron Rivest in 1989.
34: *
35: * http://www.ietf.org/rfc/rfc1115.txt
36: * http://www.ietf.org/rfc/rfc1319.txt
37: */
38:
39: #include <string.h>
40: #include <stdio.h>
41: #include "os_port.h"
42: #include "crypto.h"
43:
44: /**
45: * This code is only here to enable the verification of Verisign root
46: * certificates. So only enable it for verification mode.
47: */
48: #ifdef CONFIG_SSL_CERT_VERIFICATION
49:
50: static const uint8_t PI_SUBST[256] =
51: {
52: 0x29, 0x2E, 0x43, 0xC9, 0xA2, 0xD8, 0x7C, 0x01, 0x3D, 0x36,
53: 0x54, 0xA1, 0xEC, 0xF0, 0x06, 0x13, 0x62, 0xA7, 0x05, 0xF3,
54: 0xC0, 0xC7, 0x73, 0x8C, 0x98, 0x93, 0x2B, 0xD9, 0xBC, 0x4C,
55: 0x82, 0xCA, 0x1E, 0x9B, 0x57, 0x3C, 0xFD, 0xD4, 0xE0, 0x16,
56: 0x67, 0x42, 0x6F, 0x18, 0x8A, 0x17, 0xE5, 0x12, 0xBE, 0x4E,
57: 0xC4, 0xD6, 0xDA, 0x9E, 0xDE, 0x49, 0xA0, 0xFB, 0xF5, 0x8E,
58: 0xBB, 0x2F, 0xEE, 0x7A, 0xA9, 0x68, 0x79, 0x91, 0x15, 0xB2,
59: 0x07, 0x3F, 0x94, 0xC2, 0x10, 0x89, 0x0B, 0x22, 0x5F, 0x21,
60: 0x80, 0x7F, 0x5D, 0x9A, 0x5A, 0x90, 0x32, 0x27, 0x35, 0x3E,
61: 0xCC, 0xE7, 0xBF, 0xF7, 0x97, 0x03, 0xFF, 0x19, 0x30, 0xB3,
62: 0x48, 0xA5, 0xB5, 0xD1, 0xD7, 0x5E, 0x92, 0x2A, 0xAC, 0x56,
63: 0xAA, 0xC6, 0x4F, 0xB8, 0x38, 0xD2, 0x96, 0xA4, 0x7D, 0xB6,
64: 0x76, 0xFC, 0x6B, 0xE2, 0x9C, 0x74, 0x04, 0xF1, 0x45, 0x9D,
65: 0x70, 0x59, 0x64, 0x71, 0x87, 0x20, 0x86, 0x5B, 0xCF, 0x65,
66: 0xE6, 0x2D, 0xA8, 0x02, 0x1B, 0x60, 0x25, 0xAD, 0xAE, 0xB0,
67: 0xB9, 0xF6, 0x1C, 0x46, 0x61, 0x69, 0x34, 0x40, 0x7E, 0x0F,
68: 0x55, 0x47, 0xA3, 0x23, 0xDD, 0x51, 0xAF, 0x3A, 0xC3, 0x5C,
69: 0xF9, 0xCE, 0xBA, 0xC5, 0xEA, 0x26, 0x2C, 0x53, 0x0D, 0x6E,
70: 0x85, 0x28, 0x84, 0x09, 0xD3, 0xDF, 0xCD, 0xF4, 0x41, 0x81,
71: 0x4D, 0x52, 0x6A, 0xDC, 0x37, 0xC8, 0x6C, 0xC1, 0xAB, 0xFA,
72: 0x24, 0xE1, 0x7B, 0x08, 0x0C, 0xBD, 0xB1, 0x4A, 0x78, 0x88,
73: 0x95, 0x8B, 0xE3, 0x63, 0xE8, 0x6D, 0xE9, 0xCB, 0xD5, 0xFE,
74: 0x3B, 0x00, 0x1D, 0x39, 0xF2, 0xEF, 0xB7, 0x0E, 0x66, 0x58,
75: 0xD0, 0xE4, 0xA6, 0x77, 0x72, 0xF8, 0xEB, 0x75, 0x4B, 0x0A,
76: 0x31, 0x44, 0x50, 0xB4, 0x8F, 0xED, 0x1F, 0x1A, 0xDB, 0x99,
77: 0x8D, 0x33, 0x9F, 0x11, 0x83, 0x14
78: };
79:
80: /*
81: * MD2 context setup
82: */
83: EXP_FUNC void STDCALL MD2_Init(MD2_CTX *ctx)
84: {
85: memset(ctx, 0, sizeof *ctx);
86: }
87:
88: static void md2_process(MD2_CTX *ctx)
89: {
90: int i, j;
91: uint8_t t = 0;
92:
93: for (i = 0; i < 16; i++)
94: {
95: ctx->state[i + 16] = ctx->buffer[i];
96: ctx->state[i + 32] = ctx->buffer[i] ^ ctx->state[i];
97: }
98:
99: for (i = 0; i < 18; i++)
100: {
101: for (j = 0; j < 48; j++)
102: t = (ctx->state[j] ^= PI_SUBST[t]);
103:
104: t = (t + i) & 0xFF;
105: }
106:
107: t = ctx->cksum[15];
108:
109: for (i = 0; i < 16; i++)
110: t = (ctx->cksum[i] ^= PI_SUBST[ctx->buffer[i] ^ t]);
111: }
112:
113: /*
114: * MD2 process buffer
115: */
116: EXP_FUNC void STDCALL MD2_Update(MD2_CTX *ctx, const uint8_t *input, int ilen)
117: {
118: int fill;
119:
120: while (ilen > 0)
121: {
122: if (ctx->left + ilen > 16)
123: fill = 16 - ctx->left;
124: else
125: fill = ilen;
126:
127: memcpy(ctx->buffer + ctx->left, input, fill);
128:
129: ctx->left += fill;
130: input += fill;
131: ilen -= fill;
132:
133: if (ctx->left == 16)
134: {
135: ctx->left = 0;
136: md2_process(ctx);
137: }
138: }
139: }
140:
141: /*
142: * MD2 final digest
143: */
144: EXP_FUNC void STDCALL MD2_Final(uint8_t *output, MD2_CTX *ctx)
145: {
146: int i;
147: uint8_t x;
148:
149: x = (uint8_t)(16 - ctx->left);
150:
151: for (i = ctx->left; i < 16; i++)
152: ctx->buffer[i] = x;
153:
154: md2_process(ctx);
155:
156: memcpy(ctx->buffer, ctx->cksum, 16);
157: md2_process(ctx);
158:
159: memcpy(output, ctx->state, 16);
160: }
161:
162: #endif
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