explenatory comments
This commit is contained in:
13
main.c
13
main.c
@@ -69,6 +69,7 @@ bool prime_test(uint64_t n, int a) {
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if (n % 2 == 0) {
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return false;
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}
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//
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uint64_t d = n - 1;
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uint64_t S = 0;
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@@ -83,6 +84,7 @@ bool prime_test(uint64_t n, int a) {
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// round 1
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// 1: a^d =k 1 mod n
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uint64_t length = 0;
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// convert exponent to binary to use in quickpow
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uint64_t *d_binary = dec_to_bin(d, &length);
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unsigned __int128 first_qp_res = quick_pow(d_binary, a, n, length);
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@@ -99,6 +101,7 @@ bool prime_test(uint64_t n, int a) {
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// printf("true\n");
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return true;
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} else {
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//^2 with mod n, for each step since the next is the previous's squared
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first_qp_res = (uint64_t)(((unsigned __int128)first_qp_res * first_qp_res) % n);
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}
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}
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@@ -117,9 +120,6 @@ void *prime_thread_worker(void *arg) {
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do {
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result_ptr->prime = rand32();
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// printf("\nGenerating a new prime number (%p). Candidate: ", result_ptr);
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// printf("%ju", result_ptr->prime);
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// printf("\n");
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} while (!prime_test(result_ptr->prime, result_ptr->base));
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return NULL;
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@@ -158,6 +158,7 @@ euklidian_result_t euklidian_algorigthm_extended(uint64_t a, uint64_t b) {
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__int128 x = k % 2 == 0 ? prev_xk : -prev_xk;
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__int128 y = k % 2 == 0 ? -prev_yk : prev_yk;
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// the reason this can be casted is that two uint64_t-s cant have a lnko which is bigger than a uint64_t
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res.lnko = (uint64_t)prev_r;
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res.x = x;
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res.y = y;
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@@ -215,12 +216,13 @@ uint64_t rsa_encrypt(uint64_t *m, prime_test_t *p, prime_test_t *q, uint64_t *ou
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uint64_t fi_n = (uint64_t)(p->prime - 1) * (q->prime - 1);
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printf("n: %ju\n", fi_n);
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// 2. kulcsgeneralas
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// keygen
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uint64_t e = 65537;
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do {
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e = rand32() % fi_n;
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e = rand32() % fi_n; // should this go back as a condition inside the while loop?
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} while (e <= 1 || !prime_test(e, p->base)); // the p and q base is used everywhere anyways, i wont pass in another arg
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// calculate the d value, in eae it will be the y value
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euklidian_result_t calc_d = euklidian_algorigthm_extended(fi_n, e);
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// if either of them is less a negative number shift them into postive range with with hte modulo
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@@ -235,6 +237,7 @@ uint64_t rsa_encrypt(uint64_t *m, prime_test_t *p, prime_test_t *q, uint64_t *ou
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*out_d = d;
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uint64_t length = 0;
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// m^e mod n
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uint64_t *nyenye = dec_to_bin(e, &length);
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uint64_t c = quick_pow(nyenye, *m, n, length);
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free(nyenye);
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