Edward Stott / Crypto_light

This library implements some hash and cryptographic algorithms.

Dependents:   ES_CW2_Starter_JIN EMBEDDED_CW2 EMBEDDED_CW2_Final Spinnybois ... more

Fork of Crypto by Francois Berder

hash/MD2.cpp@15:634f9c4cbab1, 2018-03-09 (annotated)

Committer:
estott
Date:
Fri Mar 09 10:10:16 2018 +0000
Revision:
15:634f9c4cbab1
Parent:
13:ac8e23b98dae 
Reduced flash footprint by removing __forceinline directive in SHA2_32.c

Who changed what in which revision?

UserRevisionLine numberNew contents of line
feb11 7:2dbbdfb08123 1 /**
feb11 7:2dbbdfb08123 2 Implementation of MD2 as described here:
feb11 7:2dbbdfb08123 3 http://tools.ietf.org/html/rfc1319
feb11 7:2dbbdfb08123 4 */
feb11 7:2dbbdfb08123 5
feb11 7:2dbbdfb08123 6 #include "MD2.h"
feb11 7:2dbbdfb08123 7 #include <string.h>
feb11 7:2dbbdfb08123 8
feb11 7:2dbbdfb08123 9
feb11 7:2dbbdfb08123 10 static const uint8_t s[] =
feb11 7:2dbbdfb08123 11 {
feb11 7:2dbbdfb08123 12 0x29, 0x2E, 0x43, 0xC9, 0xA2, 0xD8, 0x7C, 0x01, 0x3D, 0x36, 0x54, 0xA1, 0xEC, 0xF0, 0x06, 0x13,
feb11 7:2dbbdfb08123 13 0x62, 0xA7, 0x05, 0xF3, 0xC0, 0xC7, 0x73, 0x8C, 0x98, 0x93, 0x2B, 0xD9, 0xBC, 0x4C, 0x82, 0xCA,
feb11 7:2dbbdfb08123 14 0x1E, 0x9B, 0x57, 0x3C, 0xFD, 0xD4, 0xE0, 0x16, 0x67, 0x42, 0x6F, 0x18, 0x8A, 0x17, 0xE5, 0x12,
feb11 7:2dbbdfb08123 15 0xBE, 0x4E, 0xC4, 0xD6, 0xDA, 0x9E, 0xDE, 0x49, 0xA0, 0xFB, 0xF5, 0x8E, 0xBB, 0x2F, 0xEE, 0x7A,
feb11 7:2dbbdfb08123 16 0xA9, 0x68, 0x79, 0x91, 0x15, 0xB2, 0x07, 0x3F, 0x94, 0xC2, 0x10, 0x89, 0x0B, 0x22, 0x5F, 0x21,
feb11 7:2dbbdfb08123 17 0x80, 0x7F, 0x5D, 0x9A, 0x5A, 0x90, 0x32, 0x27, 0x35, 0x3E, 0xCC, 0xE7, 0xBF, 0xF7, 0x97, 0x03,
feb11 7:2dbbdfb08123 18 0xFF, 0x19, 0x30, 0xB3, 0x48, 0xA5, 0xB5, 0xD1, 0xD7, 0x5E, 0x92, 0x2A, 0xAC, 0x56, 0xAA, 0xC6,
feb11 7:2dbbdfb08123 19 0x4F, 0xB8, 0x38, 0xD2, 0x96, 0xA4, 0x7D, 0xB6, 0x76, 0xFC, 0x6B, 0xE2, 0x9C, 0x74, 0x04, 0xF1,
feb11 7:2dbbdfb08123 20 0x45, 0x9D, 0x70, 0x59, 0x64, 0x71, 0x87, 0x20, 0x86, 0x5B, 0xCF, 0x65, 0xE6, 0x2D, 0xA8, 0x02,
feb11 7:2dbbdfb08123 21 0x1B, 0x60, 0x25, 0xAD, 0xAE, 0xB0, 0xB9, 0xF6, 0x1C, 0x46, 0x61, 0x69, 0x34, 0x40, 0x7E, 0x0F,
feb11 7:2dbbdfb08123 22 0x55, 0x47, 0xA3, 0x23, 0xDD, 0x51, 0xAF, 0x3A, 0xC3, 0x5C, 0xF9, 0xCE, 0xBA, 0xC5, 0xEA, 0x26,
feb11 7:2dbbdfb08123 23 0x2C, 0x53, 0x0D, 0x6E, 0x85, 0x28, 0x84, 0x09, 0xD3, 0xDF, 0xCD, 0xF4, 0x41, 0x81, 0x4D, 0x52,
feb11 7:2dbbdfb08123 24 0x6A, 0xDC, 0x37, 0xC8, 0x6C, 0xC1, 0xAB, 0xFA, 0x24, 0xE1, 0x7B, 0x08, 0x0C, 0xBD, 0xB1, 0x4A,
feb11 7:2dbbdfb08123 25 0x78, 0x88, 0x95, 0x8B, 0xE3, 0x63, 0xE8, 0x6D, 0xE9, 0xCB, 0xD5, 0xFE, 0x3B, 0x00, 0x1D, 0x39,
feb11 7:2dbbdfb08123 26 0xF2, 0xEF, 0xB7, 0x0E, 0x66, 0x58, 0xD0, 0xE4, 0xA6, 0x77, 0x72, 0xF8, 0xEB, 0x75, 0x4B, 0x0A,
feb11 7:2dbbdfb08123 27 0x31, 0x44, 0x50, 0xB4, 0x8F, 0xED, 0x1F, 0x1A, 0xDB, 0x99, 0x8D, 0x33, 0x9F, 0x11, 0x83, 0x14
feb11 7:2dbbdfb08123 28 };
feb11 7:2dbbdfb08123 29
feb11 7:2dbbdfb08123 30
feb11 7:2dbbdfb08123 31 MD2::MD2():
feb11 7:2dbbdfb08123 32 HashAlgorithm(),
feb11 7:2dbbdfb08123 33 bufferLength(0),
feb11 7:2dbbdfb08123 34 l(0)
feb11 7:2dbbdfb08123 35 {
feb11 7:2dbbdfb08123 36 memset(checksum, 0, 16);
feb11 7:2dbbdfb08123 37 memset(x, 0, 16);
feb11 7:2dbbdfb08123 38 }
feb11 7:2dbbdfb08123 39
feb11 7:2dbbdfb08123 40 uint8_t MD2::outputSize() const
feb11 7:2dbbdfb08123 41 {
feb11 7:2dbbdfb08123 42 return 16;
feb11 7:2dbbdfb08123 43 }
feb11 7:2dbbdfb08123 44
feb11 7:2dbbdfb08123 45 void MD2::update(uint8_t *data, uint32_t length)
feb11 7:2dbbdfb08123 46 {
feb11 7:2dbbdfb08123 47 if(bufferLength == 0)
feb11 7:2dbbdfb08123 48 {
feb11 7:2dbbdfb08123 49 while(length >= 16)
feb11 7:2dbbdfb08123 50 {
feb11 7:2dbbdfb08123 51 computeBlock(checksum, x, &l, data);
feb11 7:2dbbdfb08123 52 length -= 16;
feb11 7:2dbbdfb08123 53 data += 16;
feb11 7:2dbbdfb08123 54 }
feb11 7:2dbbdfb08123 55 bufferLength = length;
feb11 7:2dbbdfb08123 56 memcpy(buffer, data, length);
feb11 7:2dbbdfb08123 57 }
feb11 13:ac8e23b98dae 58 else if((int)length < 16-bufferLength)
feb11 7:2dbbdfb08123 59 {
feb11 7:2dbbdfb08123 60 memcpy(&buffer[bufferLength], data, length);
feb11 7:2dbbdfb08123 61 bufferLength += length;
feb11 7:2dbbdfb08123 62 }
feb11 7:2dbbdfb08123 63 else
feb11 7:2dbbdfb08123 64 {
feb11 7:2dbbdfb08123 65 int offset = 16-bufferLength;
feb11 7:2dbbdfb08123 66 memcpy(&buffer[bufferLength], data, offset);
feb11 7:2dbbdfb08123 67 computeBlock(checksum, x, &l, buffer);
feb11 7:2dbbdfb08123 68 data += offset;
feb11 7:2dbbdfb08123 69 length -= offset;
feb11 7:2dbbdfb08123 70 while(length >= 16)
feb11 7:2dbbdfb08123 71 {
feb11 7:2dbbdfb08123 72 computeBlock(checksum, x, &l, data);
feb11 7:2dbbdfb08123 73 data += 16;
feb11 7:2dbbdfb08123 74 length -= 16;
feb11 7:2dbbdfb08123 75 }
feb11 7:2dbbdfb08123 76 bufferLength = length;
feb11 7:2dbbdfb08123 77 memcpy(buffer, &data, length);
feb11 7:2dbbdfb08123 78 }
feb11 7:2dbbdfb08123 79
feb11 7:2dbbdfb08123 80 }
feb11 7:2dbbdfb08123 81
feb11 7:2dbbdfb08123 82 void MD2::finalize(uint8_t *hash)
feb11 7:2dbbdfb08123 83 {
feb11 7:2dbbdfb08123 84 // compute what's left data the buffer
feb11 7:2dbbdfb08123 85 int padding = 16 - bufferLength;
feb11 7:2dbbdfb08123 86 memset(&buffer[bufferLength], padding, padding);
feb11 7:2dbbdfb08123 87 computeBlock(checksum, x, &l, buffer);
feb11 7:2dbbdfb08123 88 computeBlock(checksum, x, &l, checksum);
feb11 7:2dbbdfb08123 89 memcpy(hash, x, 16);
feb11 7:2dbbdfb08123 90
feb11 7:2dbbdfb08123 91 uint32_t *x2 = (uint32_t*)x;
feb11 7:2dbbdfb08123 92 uint32_t *checksum2 = (uint32_t*)checksum;
feb11 7:2dbbdfb08123 93
feb11 7:2dbbdfb08123 94 // reset state
feb11 7:2dbbdfb08123 95 bufferLength = 0;
feb11 7:2dbbdfb08123 96 l = 0;
feb11 7:2dbbdfb08123 97 checksum2[0] = x2[0] = 0;
feb11 7:2dbbdfb08123 98 checksum2[1] = x2[1] = 0;
feb11 7:2dbbdfb08123 99 checksum2[2] = x2[2] = 0;
feb11 7:2dbbdfb08123 100 checksum2[3] = x2[3] = 0;
feb11 7:2dbbdfb08123 101 }
feb11 7:2dbbdfb08123 102
feb11 7:2dbbdfb08123 103 void MD2::computeHash(uint8_t *hash, uint8_t *data, uint32_t length)
feb11 7:2dbbdfb08123 104 {
feb11 7:2dbbdfb08123 105 uint8_t x[48];
feb11 7:2dbbdfb08123 106 uint8_t checksum[16];
feb11 7:2dbbdfb08123 107 uint8_t buffer[16];
feb11 7:2dbbdfb08123 108 memset(x, 0, 16);
feb11 7:2dbbdfb08123 109 memset(checksum, 0, 16);
feb11 7:2dbbdfb08123 110 uint8_t l = 0;
feb11 7:2dbbdfb08123 111 while(length >= 16)
feb11 7:2dbbdfb08123 112 {
feb11 7:2dbbdfb08123 113 computeBlock(checksum, x, &l, data);
feb11 7:2dbbdfb08123 114 length -= 16;
feb11 7:2dbbdfb08123 115 data += 16;
feb11 7:2dbbdfb08123 116 }
feb11 7:2dbbdfb08123 117
feb11 7:2dbbdfb08123 118 memcpy(buffer, data, length);
feb11 7:2dbbdfb08123 119 uint8_t padding = 16-length;
feb11 7:2dbbdfb08123 120 memset(&buffer[length], padding, padding);
feb11 7:2dbbdfb08123 121 computeBlock(checksum, x, &l, buffer);
feb11 7:2dbbdfb08123 122 computeBlock(checksum,x, &l, checksum);
feb11 7:2dbbdfb08123 123 memcpy(hash, x, 16);
feb11 7:2dbbdfb08123 124 }
feb11 7:2dbbdfb08123 125
feb11 13:ac8e23b98dae 126 #ifdef __CC_ARM
feb11 13:ac8e23b98dae 127 __forceinline
feb11 13:ac8e23b98dae 128 #endif
feb11 13:ac8e23b98dae 129 void MD2::computeBlock(uint8_t *checksum2, uint8_t *x2, uint8_t *l2, uint8_t *buffer2)
feb11 7:2dbbdfb08123 130 {
feb11 7:2dbbdfb08123 131 if(checksum2 != buffer2)
feb11 7:2dbbdfb08123 132 {
feb11 13:ac8e23b98dae 133 #ifdef __CC_ARM
feb11 13:ac8e23b98dae 134 #pragma unroll_completely
feb11 13:ac8e23b98dae 135 #endif
feb11 7:2dbbdfb08123 136 for(int j = 0; j < 16; ++j)
feb11 7:2dbbdfb08123 137 {
feb11 7:2dbbdfb08123 138 uint8_t c = buffer2[j];
feb11 7:2dbbdfb08123 139 *l2 = (checksum2[j] ^= s[c^(*l2)]);
feb11 7:2dbbdfb08123 140 }
feb11 7:2dbbdfb08123 141 }
feb11 7:2dbbdfb08123 142
feb11 7:2dbbdfb08123 143 uint32_t *x3 = (uint32_t*)x2;
feb11 7:2dbbdfb08123 144 uint32_t *buffer3 = (uint32_t*)buffer2;
feb11 7:2dbbdfb08123 145
feb11 7:2dbbdfb08123 146 x3[4] = buffer3[0];
feb11 7:2dbbdfb08123 147 x3[5] = buffer3[1];
feb11 7:2dbbdfb08123 148 x3[6] = buffer3[2];
feb11 7:2dbbdfb08123 149 x3[7] = buffer3[3];
feb11 7:2dbbdfb08123 150 for(int j = 0; j < 4; ++j)
feb11 7:2dbbdfb08123 151 x3[8+j] = x3[4+j] ^ x3[j];
feb11 7:2dbbdfb08123 152
feb11 7:2dbbdfb08123 153 uint8_t t = 0;
feb11 13:ac8e23b98dae 154 #ifdef __CC_ARM
feb11 13:ac8e23b98dae 155 #pragma unroll_completely
feb11 13:ac8e23b98dae 156 #endif
feb11 7:2dbbdfb08123 157 for(int j = 0; j < 18; ++j)
feb11 7:2dbbdfb08123 158 {
feb11 7:2dbbdfb08123 159 t = (x2[0] ^= s[t]);
feb11 7:2dbbdfb08123 160 t = (x2[1] ^= s[t]);
feb11 7:2dbbdfb08123 161 t = (x2[2] ^= s[t]);
feb11 7:2dbbdfb08123 162 t = (x2[3] ^= s[t]);
feb11 7:2dbbdfb08123 163 t = (x2[4] ^= s[t]);
feb11 7:2dbbdfb08123 164 t = (x2[5] ^= s[t]);
feb11 7:2dbbdfb08123 165 t = (x2[6] ^= s[t]);
feb11 7:2dbbdfb08123 166 t = (x2[7] ^= s[t]);
feb11 7:2dbbdfb08123 167 t = (x2[8] ^= s[t]);
feb11 7:2dbbdfb08123 168 t = (x2[9] ^= s[t]);
feb11 7:2dbbdfb08123 169 t = (x2[10] ^= s[t]);
feb11 7:2dbbdfb08123 170 t = (x2[11] ^= s[t]);
feb11 7:2dbbdfb08123 171 t = (x2[12] ^= s[t]);
feb11 7:2dbbdfb08123 172 t = (x2[13] ^= s[t]);
feb11 7:2dbbdfb08123 173 t = (x2[14] ^= s[t]);
feb11 7:2dbbdfb08123 174 t = (x2[15] ^= s[t]);
feb11 7:2dbbdfb08123 175 t = (x2[16] ^= s[t]);
feb11 7:2dbbdfb08123 176 t = (x2[17] ^= s[t]);
feb11 7:2dbbdfb08123 177 t = (x2[18] ^= s[t]);
feb11 7:2dbbdfb08123 178 t = (x2[19] ^= s[t]);
feb11 7:2dbbdfb08123 179 t = (x2[20] ^= s[t]);
feb11 7:2dbbdfb08123 180 t = (x2[21] ^= s[t]);
feb11 7:2dbbdfb08123 181 t = (x2[22] ^= s[t]);
feb11 7:2dbbdfb08123 182 t = (x2[23] ^= s[t]);
feb11 7:2dbbdfb08123 183 t = (x2[24] ^= s[t]);
feb11 7:2dbbdfb08123 184 t = (x2[25] ^= s[t]);
feb11 7:2dbbdfb08123 185 t = (x2[26] ^= s[t]);
feb11 7:2dbbdfb08123 186 t = (x2[27] ^= s[t]);
feb11 7:2dbbdfb08123 187 t = (x2[28] ^= s[t]);
feb11 7:2dbbdfb08123 188 t = (x2[29] ^= s[t]);
feb11 7:2dbbdfb08123 189 t = (x2[30] ^= s[t]);
feb11 7:2dbbdfb08123 190 t = (x2[31] ^= s[t]);
feb11 7:2dbbdfb08123 191 t = (x2[32] ^= s[t]);
feb11 7:2dbbdfb08123 192 t = (x2[33] ^= s[t]);
feb11 7:2dbbdfb08123 193 t = (x2[34] ^= s[t]);
feb11 7:2dbbdfb08123 194 t = (x2[35] ^= s[t]);
feb11 7:2dbbdfb08123 195 t = (x2[36] ^= s[t]);
feb11 7:2dbbdfb08123 196 t = (x2[37] ^= s[t]);
feb11 7:2dbbdfb08123 197 t = (x2[38] ^= s[t]);
feb11 7:2dbbdfb08123 198 t = (x2[39] ^= s[t]);
feb11 7:2dbbdfb08123 199 t = (x2[40] ^= s[t]);
feb11 7:2dbbdfb08123 200 t = (x2[41] ^= s[t]);
feb11 7:2dbbdfb08123 201 t = (x2[42] ^= s[t]);
feb11 7:2dbbdfb08123 202 t = (x2[43] ^= s[t]);
feb11 7:2dbbdfb08123 203 t = (x2[44] ^= s[t]);
feb11 7:2dbbdfb08123 204 t = (x2[45] ^= s[t]);
feb11 7:2dbbdfb08123 205 t = (x2[46] ^= s[t]);
feb11 7:2dbbdfb08123 206 t = (x2[47] ^= s[t]);
feb11 10:bc9c23aa3870 207
feb11 7:2dbbdfb08123 208 t += j;
feb11 7:2dbbdfb08123 209 }
feb11 7:2dbbdfb08123 210 }