VBK Check

gistfile1.txt

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>

#define ROTR32(x, n)		((x >> n) | (x << (32 - n)))
#define CH(x, y, z)			((x & y) ^ (~x & z))
#define MAJ(x, y, z)		((x & y) ^ (x & z) ^ (y & z))

#define SHA256_F1(x)		(ROTR32(x,  2) ^ ROTR32(x, 13) ^ ROTR32(x, 22))
#define SHA256_F2(x)		(ROTR32(x,  6) ^ ROTR32(x, 11) ^ ROTR32(x, 25))
#define SHA256_F3(x)		(ROTR32(x,  7) ^ ROTR32(x, 18) ^ (x >> 3))
#define SHA256_F4(x)		(ROTR32(x, 17) ^ ROTR32(x, 19) ^ (x >> 10))

uint32_t sha256_h0[8] =
{
	0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
	0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
};

uint32_t sha256_k[64] =
{
	0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
	0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
	0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
	0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
	0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
	0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
	0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
	0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
	0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
	0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
	0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
	0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
	0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
	0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
	0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
	0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};

void SHA2_256_Block(uint32_t *InState, uint32_t *Msg)
{
	uint32_t st[8], w[64], tmp0, tmp1;

	for(int i = 0; i < 8; ++i) st[i] = InState[i];

	for(int i = 0; i < 16; ++i) w[i] = Msg[i];

	// SHA2-256 message expansion
	for(int i = 16; i < 64; ++i)
		w[i] = SHA256_F4(w[i - 2]) + w[i - 7] + SHA256_F3(w[i - 15]) + w[i - 16];

	// Main rounds
	for(int i = 0; i < 64; ++i)
	{
		tmp0 = st[7] + SHA256_F2(st[4]) + CH(st[4], st[5], st[6]) + sha256_k[i] + w[i];
		tmp1 = SHA256_F1(st[0]) + MAJ(st[0], st[1], st[2]);
		
		st[7] = st[6];
		st[6] = st[5];
		st[5] = st[4];
		st[4] = st[3] + tmp0;
		st[3] = st[2];
		st[2] = st[1];
		st[1] = st[0];
		st[0] = tmp0 + tmp1;
	}

	for(int i = 0; i < 8; ++i) InState[i] += st[i];
}

void HashVBK(void *HashOut, uint8_t *PubKey)
{
	uint32_t State[8], Buf[16];

	for(int i = 0; i < 8; ++i) State[i] = sha256_h0[i];

	for(int i = 0; i < 16; ++i) Buf[i] = __builtin_bswap32(((uint32_t *)PubKey)[i]);

	SHA2_256_Block(State, Buf);

	memset(Buf, 0x00, 64);

	for(int i = 0; i < 6; ++i) Buf[i] = __builtin_bswap32(((uint32_t *)PubKey)[16 + i]);
	Buf[6] = 0x80000000UL;
	Buf[15] = 88UL << 3;

	SHA2_256_Block(State, Buf);

	for(int i = 0; i < 8; ++i) ((uint32_t *)HashOut)[i] = __builtin_bswap32(State[i]);
}

// Parameter len is bytes in rawstr, therefore, asciistr must have
// at least (len << 1) + 1 bytes allocated, the last for the NULL
void BinaryToASCIIHex(char *restrict asciistr, const void *restrict rawstr, size_t len)
{
	for(int i = 0, j = 0; i < len; ++i)
	{
		asciistr[j++] = "0123456789ABCDEF"[((uint8_t *)rawstr)[i] >> 4];
		asciistr[j++] = "0123456789ABCDEF"[((uint8_t *)rawstr)[i] & 0x0F];
	}
		
	asciistr[len << 1] = 0x00;
}

const uint8_t StupidEncodingHdr[23] =
{
	0x30, 0x56, 0x30, 0x10, 0x06, 0x07, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x02,
	0x01, 0x06, 0x05, 0x2b, 0x81, 0x04, 0x00, 0x0a, 0x03, 0x42, 0x00
};

const uint8_t TestKey[65] =
{
	0x04, 0x57, 0xf2, 0x09, 0x9c, 0x50, 0x2b, 0x5b, 0xd3, 0x59, 0xd2, 0x43,
	0xc2, 0x84, 0x65, 0x08, 0x9b, 0x76, 0x62, 0xcf, 0x40, 0xfa, 0x7b, 0x14,
	0x74, 0x36, 0x6b, 0x1a, 0x40, 0x8d, 0xae, 0x3a, 0x64, 0xf8, 0xf4, 0xcc,
	0xbc, 0x8f, 0x29, 0x49, 0x77, 0x93, 0xb0, 0xee, 0x3e, 0xc3, 0xe6, 0xe8,
	0xa9, 0x75, 0x4d, 0xc9, 0xd6, 0x2b, 0x87, 0x88, 0x1d, 0x85, 0x6a, 0x68,
	0xe7, 0x4a, 0xce, 0x3b, 0x69
};

int main()
{
	uint8_t InMsg[88], Digest[32];
	char *Dbg;

	memcpy(InMsg, StupidEncodingHdr, 23);
	memcpy(InMsg + 23, TestKey, 65);
	
	HashVBK(Digest, InMsg);
	
	Dbg = (char *)malloc(((sizeof(char) * 32) << 1) + 1);
	BinaryToASCIIHex(Dbg, Digest, 32);

	printf("Digest: %s\n", Dbg);
	free(Dbg);

	return(0);
}