void _stdcall sha512_hmac(const void *k, size_t k_len, const void *d, size_t d_len, char *out)
{
sha512_ctx ctx;
unsigned char buf[SHA512_BLOCK_SIZE];
unsigned char hval[SHA512_DIGEST_SIZE];
unsigned long i;
// zero key buffer
memset(buf, 0, sizeof(buf));
// compress hmac key
if (k_len > SHA512_BLOCK_SIZE) {
sha512_init(&ctx);
sha512_hash(&ctx, (const unsigned char*)k, k_len);
sha512_done(&ctx, buf);
} else {
memcpy(buf, k, k_len);
}
// create the hash initial vector
for (i = 0; i < (SHA512_BLOCK_SIZE / 4); i++) {
((unsigned long*)buf)[i] ^= 0x36363636;
}
// hash key and data
sha512_init(&ctx);
sha512_hash(&ctx, buf, SHA512_BLOCK_SIZE);
sha512_hash(&ctx, (const unsigned char*)d, d_len);
sha512_done(&ctx, hval);
// create the second HMAC vector
for (i = 0; i < (SHA512_BLOCK_SIZE / 4); i++) {
((unsigned long*)buf)[i] ^= 0x6A6A6A6A;
}
// calculate "outer" hash
sha512_init(&ctx);
sha512_hash(&ctx, buf, SHA512_BLOCK_SIZE);
sha512_hash(&ctx, hval, SHA512_DIGEST_SIZE);
sha512_done(&ctx, (unsigned char*)out);
// test buffers size alignment at compile-time
static_assert( !(sizeof(buf) % sizeof(unsigned long)), "sizeof must be 4 byte aligned");
static_assert( !(sizeof(hval) % sizeof(unsigned long)), "sizeof must be 4 byte aligned");
static_assert( !(sizeof(ctx) % sizeof(unsigned long)), "sizeof must be 4 byte aligned");
// prevent leaks
__stosd((unsigned long*)&buf, 0, (sizeof(buf) / sizeof(unsigned long)));
__stosd((unsigned long*)&hval, 0, (sizeof(hval) / sizeof(unsigned long)));
__stosd((unsigned long*)&ctx, 0, (sizeof(ctx) / sizeof(unsigned long)));
}
// __asm__ blocks are only checked for inline functions that end up being
// emitted, so call functions with __asm__ blocks to make sure their inline
// assembly parses.
void f() {
__movsb(0, 0, 0);
__movsd(0, 0, 0);
__movsw(0, 0, 0);
__stosd(0, 0, 0);
__stosw(0, 0, 0);
#ifdef _M_X64
__movsq(0, 0, 0);
__stosq(0, 0, 0);
#endif
int info[4];
__cpuid(info, 0);
__cpuidex(info, 0, 0);
_xgetbv(0);
__halt();
__nop();
__readmsr(0);
// FIXME: Call these in 64-bit too once the intrinsics have been fixed to
// work there, PR19301
#ifndef _M_X64
__readcr3();
__writecr3(0);
#endif
#ifdef _M_ARM
__dmb(_ARM_BARRIER_ISHST);
#endif
}
void _stdcall sha512_pkcs5_2(int i_count, const void *pwd, size_t pwd_len, const char *salt, size_t salt_len, char *dk, size_t dklen)
{
unsigned char buff[128];
unsigned char blk[SHA512_DIGEST_SIZE];
unsigned char hmac[SHA512_DIGEST_SIZE];
unsigned long block = 1;
size_t c_len;
int j, i;
while (dklen != 0)
{
// first interation
memcpy(buff, salt, salt_len);
((unsigned long*)(buff + salt_len))[0] = _byteswap_ulong(block);
sha512_hmac(pwd, pwd_len, buff, salt_len + 4, (char*)hmac);
memcpy(blk, hmac, SHA512_DIGEST_SIZE);
// next interations
for (i = 1; i < i_count; i++)
{
sha512_hmac(pwd, pwd_len, hmac, SHA512_DIGEST_SIZE, (char*)hmac);
for (j = 0; j < (SHA512_DIGEST_SIZE / 4); j++) {
((unsigned long*)blk)[j] ^= ((unsigned long*)hmac)[j];
}
}
memcpy(dk, blk, (c_len = dklen < SHA512_DIGEST_SIZE ? dklen : SHA512_DIGEST_SIZE));
dk += c_len;
dklen -= c_len;
block++;
}
// test buffers size alignment at compile-time
static_assert( !(sizeof(buff) % sizeof(unsigned long)), "sizeof must be 4 byte aligned");
static_assert( !(sizeof(blk) % sizeof(unsigned long)), "sizeof must be 4 byte aligned");
static_assert( !(sizeof(hmac) % sizeof(unsigned long)), "sizeof must be 4 byte aligned");
// prevent leaks
__stosd((unsigned long*)&buff, 0, (sizeof(buff) / sizeof(unsigned long)));
__stosd((unsigned long*)&blk, 0, (sizeof(blk) / sizeof(unsigned long)));
__stosd((unsigned long*)&hmac, 0, (sizeof(hmac) / sizeof(unsigned long)));
}
void Clear_REF(void* dest, size_t size)
{
__stosd(reinterpret_cast<unsigned long*>(dest), 0, size/4);
}
void memset_d(unsigned long* pBuffer, unsigned long value, std::size_t count)
{
__stosd(pBuffer, value, count);
}
