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sodark.c
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sodark.c
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/* sodark
Utility for encryption and decryption with the SoDark family of ciphers.
Copyright (C) 2017, 2020 Marcus Dansarie <[email protected]>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <assert.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "sodark.h"
void printusage(const char *name) {
fprintf(stderr, "Usage:\n");
fprintf(stderr, "%s mode rounds pt/ct key tweak\n", name);
fprintf(stderr, " -3d SoDark-3 decryption\n");
fprintf(stderr, " -3e SoDark-3 encryption\n");
fprintf(stderr, " -6d SoDark-6 decryption\n");
fprintf(stderr, " -6e SoDark-6 encryption\n");
fprintf(stderr, "%s -r {3|6} rounds key ntuples\n", name);
fprintf(stderr, " Generate ntuples random tuples with random tweaks.\n");
fprintf(stderr, "%s -r {3|6} rounds key ntuples tweak\n", name);
fprintf(stderr, " Generate ntuples random tuples with a specific tweak.\n");
fprintf(stderr, "%s -c key\n", name);
fprintf(stderr, " Generate chosen ciphertexts.\n");
}
int get_random(FILE *rand, uint64_t *ptr) {
if (fread(ptr, sizeof(uint64_t), 1, rand) != 1) {
fprintf(stderr, "Error when reading from /dev/urandom.\n");
fclose(rand);
return 1;
}
return 0;
}
int generate_chosen_ciphertexts(const char *progname, const char *keystr) {
uint64_t key = strtoull(keystr, NULL, 16);
key &= 0xffffffffffffffULL;
fprintf(stderr, "Key: %014" PRIx64 "\n", key);
FILE *randp = fopen("/dev/urandom", "r");
if (randp == NULL) {
fprintf(stderr, "Error when opening /dev/urandom.\n");
return 1;
}
uint64_t rand = 0;
while ((rand & 0xff) == 0) {
if (get_random(randp, &rand)) {
return 1;
}
}
uint8_t ds5 = rand & 0xff;
rand >>= 8;
uint8_t b7a = rand & 0xff;
rand >>= 8;
uint8_t b7b = b7a ^ ds5;
b7a = g_sbox_enc[b7a];
b7b = g_sbox_enc[b7b];
uint8_t db7 = b7a ^ b7b;
uint8_t a8a = rand & 0xff;
rand >>= 8;
uint8_t c8a = rand & 0xff;
rand >>= 8;
uint8_t a8b = a8a ^ db7;
uint8_t c8b = c8a ^ db7;
a8a = g_sbox_enc[a8a];
a8b = g_sbox_enc[a8b];
c8a = g_sbox_enc[c8a];
c8b = g_sbox_enc[c8b];
uint64_t tweak1 = 0;
if (get_random(randp, &tweak1)) {
return 1;
}
uint64_t tweak2 = tweak1 ^ (((uint64_t)ds5) << 24);
for (int k3 = 0; k3 < 0x100; k3++) {
uint8_t b8a = g_sbox_enc[b7a ^ a8a ^ c8a ^ k3 ^ (tweak1 & 0xff)];
uint8_t b8b = g_sbox_enc[b7b ^ a8b ^ c8b ^ k3 ^ (tweak2 & 0xff)];
uint32_t ct1 = (((uint32_t)a8a) << 16) | (((uint32_t)b8a) << 8) | ((uint32_t)c8a);
uint32_t ct2 = (((uint32_t)a8b) << 16) | (((uint32_t)b8b) << 8) | ((uint32_t)c8b);
uint32_t pt1 = decrypt_sodark_3(8, ct1, key, tweak1);
uint32_t pt2 = decrypt_sodark_3(8, ct2, key, tweak2);
printf("%06x %06x %016" PRIx64 " %06x %06x %016" PRIx64 " %02x\n",
pt1, ct1, tweak1, pt2, ct2, tweak2, k3);
}
return 0;
}
int generate_tuples(const char *progname, const char *versionstr, const char *roundstr,
const char *keystr, const char *ntuplestr, const char *tweakstr) {
uint32_t rounds = atoi(roundstr);
uint64_t key = strtoull(keystr, NULL, 16);
uint32_t tuples = atoi(ntuplestr);
uint64_t tweak = 0;
if (tweakstr != NULL) {
tweak = strtoull(tweakstr, NULL, 16);
}
FILE *randp = fopen("/dev/urandom", "r");
if (randp == NULL) {
fprintf(stderr, "Error when opening /dev/urandom.\n");
return 1;
}
int version = 0;
if (strcmp(versionstr, "3") == 0) {
version = 3;
} else if (strcmp(versionstr, "6") == 0) {
version = 6;
} else {
printusage(progname);
fclose(randp);
return 1;
}
fprintf(stderr, "Generating %d random tuples with SoDark-%d.\n", tuples, version);
fprintf(stderr, "Rounds: %d\n", rounds);
fprintf(stderr, "Key: %014" PRIx64 "\n", key);
if (tweakstr != NULL) {
fprintf(stderr, "Tweak: %016" PRIx64 "\n", tweak);
}
uint64_t pt;
for (int i = 0; i < tuples; i++) {
if (get_random(randp, &pt) || (tweakstr == NULL && get_random(randp, &tweak))) {
return 1;
}
if (version == 3) {
pt &= 0xffffff;
uint32_t ct = encrypt_sodark_3(rounds, (uint32_t)pt, key, tweak);
printf("%06x %06x %016" PRIx64 "\n", (uint32_t)pt, ct, tweak);
} else {
pt &= 0xffffffffffffL;
uint64_t ct = encrypt_sodark_6(rounds, pt, key, tweak);
printf("%012" PRIx64 " %012" PRIx64 " %016" PRIx64 "\n", pt, ct, tweak);
}
}
fclose(randp);
return 0;
}
int main(int argc, char **argv) {
create_sodark_dec_sbox();
assert(enc_one_round_3(0x54e0cd, 0xc2284a ^ 0x543bd8) == 0xd0721d);
assert(dec_one_round_3(0xd0721d, 0xc2284a ^ 0x543bd8) == 0x54e0cd);
assert(dec_one_round_3(dec_one_round_3(0xd0721d, 0xc2284a ^ 0x543bd8), 0) == 0x2ac222);
assert(dec_one_round_6(enc_one_round_6(0x1234567890ab, 0x6d7dddd48390), 0x6d7dddd48390)
== 0x1234567890ab);
assert(encrypt_sodark_3(3, 0x54e0cd, 0xc2284a1ce7be2f, 0x543bd88000017550) == 0x41db0c);
assert(encrypt_sodark_3(4, 0x54e0cd, 0xc2284a1ce7be2f, 0x543bd88000017550) == 0x987c6d);
assert(decrypt_sodark_3(1, 0xd0721d, 0xc2284a1ce7be2f, 0x543bd88000017550) == 0x54e0cd);
assert(decrypt_sodark_3(3, 0x41db0c, 0xc2284a1ce7be2f, 0x543bd88000017550) == 0x54e0cd);
assert(decrypt_sodark_3(4, 0x987c6d, 0xc2284a1ce7be2f, 0x543bd88000017550) == 0x54e0cd);
assert(decrypt_sodark_6(1, encrypt_sodark_6(1, 0xdeafcafebabe, 0xc2284a1ce7be2f,
0x543bd88000017550), 0xc2284a1ce7be2f, 0x543bd88000017550) == 0xdeafcafebabe);
if (argc == 3 && strcmp(argv[1], "-c") == 0) {
return generate_chosen_ciphertexts(argv[0], argv[2]);
} else if (argc == 6 && strcmp(argv[1], "-r") == 0) {
return generate_tuples(argv[0], argv[2], argv[3], argv[4], argv[5], NULL);
} else if (argc == 6) {
uint32_t rounds = atoi(argv[2]);
uint64_t pt_ct = strtoull(argv[3], NULL, 16);
uint64_t key = strtoull(argv[4], NULL, 16);
uint64_t tweak = strtoull(argv[5], NULL, 16);
if (rounds <= 0) {
fprintf(stderr, "Bad number of rounds.\n\n");
printusage(argv[0]);
return 1;
}
printf("Rounds: %d\n", rounds);
if (strcmp(argv[1], "-3d") == 0 || strcmp(argv[1], "-3e") == 0) {
printf("PT/CT: %06" PRIx64 "\n", pt_ct);
} else {
printf("PT/CT: %012" PRIx64 "\n", pt_ct);
}
printf("Key: %014" PRIx64 "\n", key);
printf("Tweak: %016" PRIx64 "\n", tweak);
if (strcmp(argv[1], "-3d") == 0) {
printf("PT: %06" PRIx32 "\n", decrypt_sodark_3(rounds, (uint32_t)pt_ct, key, tweak));
} else if (strcmp(argv[1], "-3e") == 0) {
printf("CT: %06" PRIx32 "\n", encrypt_sodark_3(rounds, (uint32_t)pt_ct, key, tweak));
} else if (strcmp(argv[1], "-6d") == 0) {
printf("PT: %012" PRIx64 "\n", decrypt_sodark_6(rounds, pt_ct, key, tweak));
} else if (strcmp(argv[1], "-6e") == 0) {
printf("CT: %012" PRIx64 "\n", encrypt_sodark_6(rounds, pt_ct, key, tweak));
} else {
fprintf(stderr, "Bad mode.\n\n");
printusage(argv[0]);
return 1;
}
} else if (argc == 7 && strcmp(argv[1], "-r") == 0) {
return generate_tuples(argv[0], argv[2], argv[3], argv[4], argv[5], argv[6]);
} else {
printusage(argv[0]);
return 1;
}
return 0;
}