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67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
#include <stdio.h>
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#include <unistd.h>
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#include <strings.h>
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#include <openssl/sha.h>
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#include <openssl/err.h>
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#include <openssl/rand.h>
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#include <openssl/hmac.h>
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#include <openssl/aes.h>
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#include <openssl/evp.h>
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#include <openssl/crypto.h>
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#include <strings.h>
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#include <stdlib.h>
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#include <time.h>
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void printhex(uint8_t * hashed_seed, size_t len) {
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for(int i = 0; i < len; i++)
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printf("%02x",hashed_seed[i]);
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printf(" (size %lu)\n", len);
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};
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int main(int argc, char ** argv) {
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SHA256_CTX sha256;
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uint8_t seed[ 32 ];
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bzero(seed,sizeof(seed));
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printf("Seed:\t\t"); printhex(seed,sizeof(seed));
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uint8_t hashed_seed[32];
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SHA256_Init(&sha256);
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SHA256_Update(&sha256, seed, 32);
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SHA256_Final(hashed_seed, &sha256);
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printf("H(Seed):\t\t"); printhex(hashed_seed, 32);
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printf("TRUNCATE128(H(Seed)):\t"); printhex(hashed_seed, 128 / 8 );
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struct tm ts = {
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.tm_sec = 0, .tm_min = 0, .tm_hour = 0,
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.tm_mon = 3, .tm_year = 120,
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.tm_wday = 5,
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.tm_isdst = 0, .tm_gmtoff = 0
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};
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time_t t = timegm(&ts);
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printf("Time:\t\t%lu\n", t);
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uint8_t tbuff[4];
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*(uint32_t *)tbuff= htonl(t);
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printf("t:\t\t"); printhex(tbuff,4);
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uint8_t ephid_concat_t[16 + 4];
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bcopy(hashed_seed, ephid_concat_t + 0, 16);
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bcopy(tbuff ,ephid_concat_t + 16, 4);
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printf("ephid||t:\t\t"); printhex(ephid_concat_t, 16+4);
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uint8_t hash[32];
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SHA256_Init(&sha256);
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SHA256_Update(&sha256, ephid_concat_t, 16 + 4);
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SHA256_Final(hash, &sha256);
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printf("H(E || t)):\t"); printhex(hash, 32);
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}
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