129 рядки
3.6 KiB
C
129 рядки
3.6 KiB
C
#include "hash_address.h"
|
|
#include "xmss_commons.h"
|
|
#include "params.h"
|
|
#include "hash.h"
|
|
#include "fips202.h"
|
|
|
|
#include <stdint.h>
|
|
#include <openssl/sha.h>
|
|
|
|
void addr_to_bytes(unsigned char *bytes, const uint32_t addr[8])
|
|
{
|
|
int i;
|
|
for (i = 0; i < 8; i++) {
|
|
ull_to_bytes(bytes + i*4, addr[i], 4);
|
|
}
|
|
}
|
|
|
|
static int core_hash(const xmss_params *params,
|
|
unsigned char *out, const unsigned int type,
|
|
const unsigned char *key, unsigned int keylen,
|
|
const unsigned char *in, unsigned long long inlen, int n)
|
|
{
|
|
unsigned long long i = 0;
|
|
unsigned char buf[inlen + n + keylen];
|
|
|
|
/* We arrange the input into the hash function to be of the form:
|
|
* toByte(X, 32) || KEY || M
|
|
*/
|
|
|
|
ull_to_bytes(buf, type, n);
|
|
|
|
for (i=0; i < keylen; i++) {
|
|
buf[i+n] = key[i];
|
|
}
|
|
|
|
for (i=0; i < inlen; i++) {
|
|
buf[keylen + n + i] = in[i];
|
|
}
|
|
|
|
if (n == 32 && params->func == XMSS_SHA2) {
|
|
SHA256(buf, inlen + keylen + n, out);
|
|
}
|
|
else if (n == 32 && params->func == XMSS_SHAKE) {
|
|
shake128(out, 32, buf, inlen + keylen + n);
|
|
}
|
|
else if (n == 64 && params->func == XMSS_SHA2) {
|
|
SHA512(buf, inlen + keylen + n, out);
|
|
}
|
|
else if (n == 64 && params->func == XMSS_SHAKE) {
|
|
shake256(out, 64, buf, inlen + keylen + n);
|
|
}
|
|
else {
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int prf(const xmss_params *params,
|
|
unsigned char *out, const unsigned char *in,
|
|
const unsigned char *key, unsigned int keylen)
|
|
{
|
|
return core_hash(params, out, 3, key, keylen, in, 32, keylen);
|
|
}
|
|
|
|
int h_msg(const xmss_params *params,
|
|
unsigned char *out,
|
|
const unsigned char *in, unsigned long long inlen,
|
|
const unsigned char *key, const unsigned int keylen)
|
|
{
|
|
return core_hash(params, out, 2, key, keylen, in, inlen, params->n);
|
|
}
|
|
|
|
/**
|
|
* We assume the left half is in in[0]...in[n-1]
|
|
*/
|
|
int hash_h(const xmss_params *params,
|
|
unsigned char *out, const unsigned char *in,
|
|
const unsigned char *pub_seed, uint32_t addr[8])
|
|
{
|
|
unsigned char buf[2*params->n];
|
|
unsigned char key[params->n];
|
|
unsigned char bitmask[2*params->n];
|
|
unsigned char addr_as_bytes[32];
|
|
unsigned int i;
|
|
|
|
/* Generate the n-byte key. */
|
|
set_key_and_mask(addr, 0);
|
|
addr_to_bytes(addr_as_bytes, addr);
|
|
prf(params, key, addr_as_bytes, pub_seed, params->n);
|
|
|
|
/* Generate the 2n-byte mask. */
|
|
set_key_and_mask(addr, 1);
|
|
addr_to_bytes(addr_as_bytes, addr);
|
|
prf(params, bitmask, addr_as_bytes, pub_seed, params->n);
|
|
|
|
set_key_and_mask(addr, 2);
|
|
addr_to_bytes(addr_as_bytes, addr);
|
|
prf(params, bitmask + params->n, addr_as_bytes, pub_seed, params->n);
|
|
|
|
for (i = 0; i < 2*params->n; i++) {
|
|
buf[i] = in[i] ^ bitmask[i];
|
|
}
|
|
return core_hash(params, out, 1, key, params->n, buf, 2*params->n, params->n);
|
|
}
|
|
|
|
int hash_f(const xmss_params *params,
|
|
unsigned char *out, const unsigned char *in,
|
|
const unsigned char *pub_seed, uint32_t addr[8])
|
|
{
|
|
unsigned char buf[params->n];
|
|
unsigned char key[params->n];
|
|
unsigned char bitmask[params->n];
|
|
unsigned char addr_as_bytes[32];
|
|
unsigned int i;
|
|
|
|
set_key_and_mask(addr, 0);
|
|
addr_to_bytes(addr_as_bytes, addr);
|
|
prf(params, key, addr_as_bytes, pub_seed, params->n);
|
|
|
|
set_key_and_mask(addr, 1);
|
|
addr_to_bytes(addr_as_bytes, addr);
|
|
prf(params, bitmask, addr_as_bytes, pub_seed, params->n);
|
|
|
|
for (i = 0; i < params->n; i++) {
|
|
buf[i] = in[i] ^ bitmask[i];
|
|
}
|
|
return core_hash(params, out, 0, key, params->n, buf, params->n, params->n);
|
|
}
|