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fix: error in reference

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This commit is contained in:
Thomas Florian 2022-06-29 19:10:43 +02:00
parent 331ed1750f
commit 9133601088
1 changed files with 21 additions and 18 deletions
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39
Implementierung/src/md2.c
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@ -5,23 +5,23 @@
// Source: https://datatracker.ietf.org/doc/html/rfc1319 // Source: https://datatracker.ietf.org/doc/html/rfc1319
static unsigned char PI_SUBST[256] = { static unsigned char PI_SUBST[256] = {
41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6, 41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6,
19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188, 76, 19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188, 76,
130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24, 138, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24, 138,
23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251, 245, 142, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251, 245, 142,
187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63, 148, 194, 16, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63, 148, 194, 16,
137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50, 39, 53, 62, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50, 39, 53, 62,
204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165, 181, 209, 215, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165, 181, 209, 215,
94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210, 150, 164, 125, 182, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210, 150, 164, 125, 182,
118, 252, 107, 226, 156, 116, 4, 241, 69, 157, 112, 89, 100, 113, 135, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157, 112, 89, 100, 113, 135,
32, 134, 91, 207, 101, 230, 45, 168, 2, 27, 96, 37, 173, 174, 176, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27, 96, 37, 173, 174, 176,
185, 246, 28, 70, 97, 105, 52, 64, 126, 15, 85, 71, 163, 35, 221, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15, 85, 71, 163, 35, 221,
81, 175, 58, 195, 92, 249, 206, 186, 197, 234, 38, 44, 83, 13, 110, 81, 175, 58, 195, 92, 249, 206, 186, 197, 234, 38, 44, 83, 13, 110,
133, 40, 132, 9, 211, 223, 205, 244, 65, 129, 77, 82, 106, 220, 55, 133, 40, 132, 9, 211, 223, 205, 244, 65, 129, 77, 82, 106, 220, 55,
200, 108, 193, 171, 250, 36, 225, 123, 8, 12, 189, 177, 74, 120, 136, 200, 108, 193, 171, 250, 36, 225, 123, 8, 12, 189, 177, 74, 120, 136,
149, 139, 227, 99, 232, 109, 233, 203, 213, 254, 59, 0, 29, 57, 242, 149, 139, 227, 99, 232, 109, 233, 203, 213, 254, 59, 0, 29, 57, 242,
239, 183, 14, 102, 88, 208, 228, 166, 119, 114, 248, 235, 117, 75, 10, 239, 183, 14, 102, 88, 208, 228, 166, 119, 114, 248, 235, 117, 75, 10,
49, 68, 80, 180, 143, 237, 31, 26, 219, 153, 141, 51, 159, 17, 131, 49, 68, 80, 180, 143, 237, 31, 26, 219, 153, 141, 51, 159, 17, 131,
20}; 20};
void printBuf(size_t len, uint8_t buf[len]) { void printBuf(size_t len, uint8_t buf[len]) {
@ -37,7 +37,8 @@ void md2_checksum(size_t len, uint8_t* buf) {
for (int i = 0; i < len / 16; i++) { for (int i = 0; i < len / 16; i++) {
for (int j = 0; j < 16; j++) { for (int j = 0; j < 16; j++) {
u_int8_t c = buf[i * 16 + j]; u_int8_t c = buf[i * 16 + j];
l = buf[len + j] = PI_SUBST[c ^ l]; // reference is wrong. It says: Set C[j] to S[c xor L]. But it should be:
l = buf[len + j] ^= PI_SUBST[c ^ l];
} }
} }
} }
@ -54,6 +55,8 @@ void md2_hash(size_t len, const uint8_t buf[len], uint8_t out[16]) {
uint8_t* newBuf = calloc(len + 16, sizeof(uint8_t)); uint8_t* newBuf = calloc(len + 16, sizeof(uint8_t));
memcpy(newBuf, buf, len - paddingNeeded); memcpy(newBuf, buf, len - paddingNeeded);
printBuf(len + 16, newBuf);
while (paddingNeeded > 0) { while (paddingNeeded > 0) {
newBuf[len - paddingNeeded] = originalPadding; newBuf[len - paddingNeeded] = originalPadding;
paddingNeeded--; paddingNeeded--;