103 lines
2.1 KiB
C++
103 lines
2.1 KiB
C++
//
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// Created by neo on 5/26/2023.
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//
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#include "shared.h"
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uint8_t cset[] = "BCDFGHJKMPQRTVWXY2346789";
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// Reverse data
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void endian(uint8_t *data, int len)
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{
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int i;
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for (i = 0; i < len/2; i++) {
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uint8_t temp;
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temp = data[i];
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data[i] = data[len-i-1];
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data[len-i-1] = temp;
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}
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}
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void unbase24(uint32_t *x, uint8_t *c)
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{
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memset(x, 0, 16);
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int i, n;
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BIGNUM *y = BN_new();
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BN_zero(y);
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for (i = 0; i < 25; i++)
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{
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BN_mul_word(y, 24);
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BN_add_word(y, c[i]);
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}
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n = BN_num_bytes(y);
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BN_bn2bin(y, (uint8_t *)x);
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BN_free(y);
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endian((uint8_t *)x, n);
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}
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void base24(uint8_t *c, uint32_t *x)
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{
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uint8_t y[16];
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int i;
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BIGNUM *z;
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// Convert x to BigNum z
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memcpy(y, x, sizeof(y)); // Copy X to Y; Y=X
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for (i = 15; y[i] == 0; i--) {} i++; // skip following nulls
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endian(y, i); // Reverse y
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z = BN_bin2bn(y, i, NULL); // Convert y to BigNum z
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// Divide z by 24 and convert remainder with cset to Base24-CDKEY Char
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c[25] = 0;
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for (i = 24; i >= 0; i--) {
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uint8_t t = BN_div_word(z, 24);
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c[i] = cset[t];
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}
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BN_free(z);
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}
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void print_product_id(uint32_t *pid)
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{
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char raw[12];
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char b[6], c[8];
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int i, digit = 0;
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// Cut a away last bit of pid and convert it to an accii-number (=raw)
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sprintf(raw, "%d", pid[0] >> 1);
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// Make b-part {640-....}
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strncpy(b, raw, 3);
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b[3] = 0;
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// Make c-part {...-123456X...}
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strcpy(c, raw + 3);
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printf("> %s\n", c);
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// Make checksum digit-part {...56X-}
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assert(strlen(c) == 6);
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for (i = 0; i < 6; i++)
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digit -= c[i] - '0'; // Sum digits
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while (digit < 0)
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digit += 7;
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c[6] = digit + '0';
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c[7] = 0;
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printf("Product ID: 55274-%s-%s-23xxx\n", b, c);
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}
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void print_product_key(uint8_t *pk)
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{
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int i;
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assert(strlen((const char *)pk) == 25);
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for (i = 0; i < 25; i++) {
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putchar(pk[i]);
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if (i != 24 && i % 5 == 4) putchar('-');
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}
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} |