130 lines
4.4 KiB
C
130 lines
4.4 KiB
C
#include "../../lib/md2_impls/md2_common.h"
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// Source: https://datatracker.ietf.org/doc/html/rfc1319
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unsigned char MD2_PI_SUBST[256] = {
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41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6,
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19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188, 76,
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130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24, 138,
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23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251, 245, 142,
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187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63, 148, 194, 16,
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137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50, 39, 53, 62,
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204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165, 181, 209, 215,
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94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210, 150, 164, 125, 182,
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118, 252, 107, 226, 156, 116, 4, 241, 69, 157, 112, 89, 100, 113, 135,
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32, 134, 91, 207, 101, 230, 45, 168, 2, 27, 96, 37, 173, 174, 176,
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185, 246, 28, 70, 97, 105, 52, 64, 126, 15, 85, 71, 163, 35, 221,
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81, 175, 58, 195, 92, 249, 206, 186, 197, 234, 38, 44, 83, 13, 110,
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133, 40, 132, 9, 211, 223, 205, 244, 65, 129, 77, 82, 106, 220, 55,
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200, 108, 193, 171, 250, 36, 225, 123, 8, 12, 189, 177, 74, 120, 136,
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149, 139, 227, 99, 232, 109, 233, 203, 213, 254, 59, 0, 29, 57, 242,
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239, 183, 14, 102, 88, 208, 228, 166, 119, 114, 248, 235, 117, 75, 10,
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49, 68, 80, 180, 143, 237, 31, 26, 219, 153, 141, 51, 159, 17, 131,
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20};
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void md2_print_buf(size_t len, uint8_t buf[len]) {
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for (size_t i = 0; i < len; i++) {
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printf("'%02x',", buf[i]);
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}
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printf("\n");
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}
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static double detailed_benchmark_timestamps[6] = {0, 0, 0, 0, 0, 0};
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static double detailed_benchmark_times[3] = {0, 0, 0};
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void md2_process_detailed_benchmark_step(
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enum md2_detailed_benchmark_step step) {
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switch (step) {
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case CHECKSUM_START:
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case FIRST_LOOP_START:
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case SECOND_LOOP_START:
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detailed_benchmark_timestamps[step] = current_time();
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return;
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case CHECKSUM_END:
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case FIRST_LOOP_END:
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case SECOND_LOOP_END:
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detailed_benchmark_timestamps[step] = current_time();
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detailed_benchmark_times[step / 2] +=
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detailed_benchmark_timestamps[step] -
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detailed_benchmark_timestamps[step - 1];
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return;
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}
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}
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void md2_print_detailed_benchmark_result() {
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printf("Detailed benchmarking results:\n");
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printf(" Checksum: %f\n", detailed_benchmark_times[0]);
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printf(" First loop: %f\n", detailed_benchmark_times[1]);
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printf(" Second loop: %f\n", detailed_benchmark_times[2]);
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printf("\n");
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}
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uint8_t* md2_add_padding_and_space_for_checksum(const uint8_t* buf,
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size_t* len) {
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int paddingNeeded = 16 - ((*len) % 16);
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uint8_t originalPadding = paddingNeeded;
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(*len) += paddingNeeded;
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// +16 for the checksum
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uint8_t* newBuf = calloc((*len) + 16, sizeof(uint8_t));
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if (newBuf == NULL) {
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return NULL;
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}
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memcpy(newBuf, buf, (*len) - paddingNeeded);
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while (paddingNeeded > 0) {
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newBuf[(*len) - paddingNeeded] = originalPadding;
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paddingNeeded--;
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}
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return newBuf;
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}
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void md2_process_block_checksum(uint8_t const block[16], uint8_t checksum[16],
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uint8_t* l) {
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for (int j = 0; j < 16; j++) {
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u_int8_t c = block[j];
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// reference is wrong. It says: Set C[j] to S[c xor L]. But it should be:
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(*l) = checksum[j] ^= MD2_PI_SUBST[c ^ (*l)];
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}
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}
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void md2_checksum(size_t len, uint8_t* buf) {
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md2_checksum_with_target(len, buf, buf + len);
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}
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void md2_checksum_with_target(size_t len, const uint8_t* buf,
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uint8_t checksum[16]) {
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CHECKSUM_START_MARK
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uint8_t l = 0;
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for (size_t i = 0; i < len / 16; i++) {
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md2_process_block_checksum(buf + i * 16, checksum, &l);
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}
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CHECKSUM_END_MARK
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}
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void md2_second_loop(uint8_t* messageDigestBuf) {
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u_int8_t t = 0;
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SECOND_LOOP_START_MARK
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for (int j = 0; j < 17; j++) {
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for (int k = 0; k < 48; k++) {
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t = messageDigestBuf[k] = messageDigestBuf[k] ^ MD2_PI_SUBST[t];
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}
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t = (t + j) & 255;
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}
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for (int k = 0; k < 16; k++) {
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t = messageDigestBuf[k] = messageDigestBuf[k] ^ MD2_PI_SUBST[t];
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}
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SECOND_LOOP_END_MARK
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}
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void md2_first_loop(const uint8_t* buf, uint8_t* messageDigestBuf, size_t i) {
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FIRST_LOOP_START_MARK
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for (int j = 0; j < 16; j++) {
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messageDigestBuf[16 + j] = buf[i * 16 + j];
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messageDigestBuf[32 + j] = (messageDigestBuf[16 + j] ^ messageDigestBuf[j]);
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}
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FIRST_LOOP_END_MARK
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} |