Annotation of embedaddon/axTLS/crypto/md2.c, revision 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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