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update CMakeLists to correctly compile sources - update readme to reflect that

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factor out reused functions to shared.cpp/shared.h
This commit is contained in:
Neo
2023-05-30 12:37:13 -07:00
parent ac47a88f7e
commit 05ee5eb933
9 changed files with 159 additions and 188 deletions
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104
xp_algorithm.cpp
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@@ -15,17 +15,10 @@
*/
#include <stdio.h>
#include <string.h>
#include <openssl/bn.h>
#include <openssl/ec.h>
#include <openssl/sha.h>
#include <assert.h>
#include "shared.h"
#define FIELD_BITS 384
#define FIELD_BYTES 48
uint8_t cset[] = "BCDFGHJKMPQRTVWXY2346789";
static void unpack(uint32_t *pid, uint32_t *hash, uint32_t *sig, uint32_t *raw)
@@ -49,101 +42,6 @@ static void pack(uint32_t *raw, uint32_t *pid, uint32_t *hash, uint32_t *sig)
raw[3] = sig[1] >> 5;
}
// Reverse data
static void endian(uint8_t *data, int len)
{
int i;
for (i = 0; i < len/2; i++) {
uint8_t temp;
temp = data[i];
data[i] = data[len-i-1];
data[len-i-1] = temp;
}
}
void unbase24(uint32_t *x, uint8_t *c)
{
memset(x, 0, 16);
int i, n;
BIGNUM *y = BN_new();
BN_zero(y);
for (i = 0; i < 25; i++)
{
BN_mul_word(y, 24);
BN_add_word(y, c[i]);
}
n = BN_num_bytes(y);
BN_bn2bin(y, (uint8_t *)x);
BN_free(y);
endian((uint8_t *)x, n);
}
void base24(uint8_t *c, uint32_t *x)
{
uint8_t y[16];
int i;
BIGNUM *z;
// Convert x to BigNum z
memcpy(y, x, sizeof(y)); // Copy X to Y; Y=X
for (i = 15; y[i] == 0; i--) {} i++; // skip following nulls
endian(y, i); // Reverse y
z = BN_bin2bn(y, i, NULL); // Convert y to BigNum z
// Divide z by 24 and convert remainder with cset to Base24-CDKEY Char
c[25] = 0;
for (i = 24; i >= 0; i--) {
uint8_t t = BN_div_word(z, 24);
c[i] = cset[t];
}
BN_free(z);
}
void print_product_id(uint32_t *pid)
{
char raw[12];
char b[6], c[8];
int i, digit = 0;
// Cut a away last bit of pid and convert it to an accii-number (=raw)
sprintf(raw, "%d", pid[0] >> 1);
// Make b-part {640-....}
strncpy(b, raw, 3);
b[3] = 0;
// Make c-part {...-123456X...}
strcpy(c, raw + 3);
// Make checksum digit-part {...56X-}
assert(strlen(c) == 6);
for (i = 0; i < 6; i++)
digit -= c[i] - '0'; // Sum digits
while (digit < 0)
digit += 7;
c[6] = digit + '0';
c[7] = 0;
printf("Product ID: 55274-%s-%s-23xxx\n", b, c);
}
void print_product_key(uint8_t *pk)
{
int i;
assert(strlen((const char *)pk) == 25);
for (i = 0; i < 25; i++) {
putchar(pk[i]);
if (i != 24 && i % 5 == 4) putchar('-');
}
}
void verify(EC_GROUP *ec, EC_POINT *generator, EC_POINT *public_key, char *cdkey)
{
uint8_t key[25];