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Feat: implement 5

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This commit is contained in:
Dorian Zedler 2022-06-29 16:12:09 +02:00
parent 76a685d1b7
commit 0d3771c719
Signed by: dorian
GPG key ID: 989DE36109AFA354
2 changed files with 29 additions and 21 deletions
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8
Implementierung/src/main.c
View file

@ -21,7 +21,13 @@ int main(int argc, char** argv) {
c.filename, c.implementationToUse, c.doBenchmark, c.benchmarkingCycles); c.filename, c.implementationToUse, c.doBenchmark, c.benchmarkingCycles);
uint8_t out[16]; uint8_t out[16];
md2_hash(3, "abc", out); md2_hash(0, "", out);
printf("Hash: ");
for (int i = 0; i < 16; i++) {
printf("%02x", out[i]);
}
printf("\n");
return 0; return 0;
} }

40
Implementierung/src/md2.c
View file

@ -6,23 +6,23 @@
// 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, 19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188, 76,
76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24, 138,
138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251, 245, 142,
245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63, 148, 194, 16,
148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50, 39, 53, 62,
39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165, 181, 209, 215,
181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210, 150, 164, 125, 182,
150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157, 112, 89, 100, 113, 135,
112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27, 96, 37, 173, 174, 176,
96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15, 85, 71, 163, 35, 221,
85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197, 81, 175, 58, 195, 92, 249, 206, 186, 197, 234, 38, 44, 83, 13, 110,
234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65, 133, 40, 132, 9, 211, 223, 205, 244, 65, 129, 77, 82, 106, 220, 55,
129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123, 200, 108, 193, 171, 250, 36, 225, 123, 8, 12, 189, 177, 74, 120, 136,
8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233, 149, 139, 227, 99, 232, 109, 233, 203, 213, 254, 59, 0, 29, 57, 242,
203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228, 239, 183, 14, 102, 88, 208, 228, 166, 119, 114, 248, 235, 117, 75, 10,
166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237, 49, 68, 80, 180, 143, 237, 31, 26, 219, 153, 141, 51, 159, 17, 131,
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]) {
for (int i = 0; i < len; i++) { for (int i = 0; i < len; i++) {
@ -66,9 +66,10 @@ void md2_hash(size_t len, const uint8_t buf[len], uint8_t out[16]) {
printBuf(len + 16, newBuf); printBuf(len + 16, newBuf);
// implement step 3 // implement step 3
u_int8_t messageDigestBuf = calloc(48, sizeof(uint8_t)); u_int8_t* messageDigestBuf = calloc(48, sizeof(uint8_t));
for (int i = 0; i <= len / 16; i++) { // <= because we need to hash the last block too for (int i = 0; i <= len / 16;
i++) { // <= because we need to hash the last block too
for (int j = 0; j < 16; j++) { for (int j = 0; j < 16; j++) {
messageDigestBuf[16 + j] = newBuf[i * 16 + j]; messageDigestBuf[16 + j] = newBuf[i * 16 + j];
messageDigestBuf[32 + j] = (newBuf[16 + j] ^ messageDigestBuf[j]); messageDigestBuf[32 + j] = (newBuf[16 + j] ^ messageDigestBuf[j]);
@ -86,6 +87,7 @@ void md2_hash(size_t len, const uint8_t buf[len], uint8_t out[16]) {
printf("messageDigestBuf: \n"); printf("messageDigestBuf: \n");
printBuf(16, messageDigestBuf); printBuf(16, messageDigestBuf);
memcpy(out, messageDigestBuf, 16);
free(messageDigestBuf); free(messageDigestBuf);
free(newBuf); free(newBuf);