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sha256_hash.cpp
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sha256_hash.cpp
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/*
* This file has support for SHA-256-based parameter sets
* This does those functions that are the same for both simple and
* robust parameter sets
*/
#include <string.h>
#include "api.h"
#include "internal.h"
#include "sha256.h"
#include "sha256avx.h"
#include "mgf1.h"
namespace sphincs_plus {
// This precomputes the SHA-256 hash state after processing the public seed
void sha256_hash::initialize_public_seed(const unsigned char *pub_seed) {
uint8_t block[sha256_block_size];
size_t i;
size_t n = len_hash();
for (i = 0; i < n; ++i) {
block[i] = pub_seed[i];
}
for (; i < sha256_block_size; ++i) {
block[i] = 0;
}
SHA256_CTX ctx;
ctx.init();
ctx.update( block, sha256_block_size );
ctx.export_intermediate( state_seeded );
}
void sha256_hash::set_public_key(const unsigned char *public_key) {
key::set_public_key(public_key);
initialize_public_seed( get_public_seed() );
}
void sha256_hash::set_private_key(const unsigned char *private_key) {
key::set_private_key(private_key);
initialize_public_seed( get_public_seed() );
}
/*
* 8-way parallel version of prf_addr; takes 8x as much input and output
* This is SHA-256 specific
*/
void sha256_hash::prf_addr_xn(unsigned char **out,
const addr_t* addrx8)
{
__m256i outbufx8[8][sha256_output_size / sizeof(__m256i)];
sha256ctx8x ctx;
sha256_init_frombytes_x8(&ctx, state_seeded, 512);
int n = len_hash();
sha256_update8x(&ctx,
&addrx8[0],
&addrx8[1],
&addrx8[2],
&addrx8[3],
&addrx8[4],
&addrx8[5],
&addrx8[6],
&addrx8[7],
sha256_addr_bytes );
const unsigned char* key = get_secret_seed();
sha256_update8x(&ctx,
key,
key,
key,
key,
key,
key,
key,
key,
n );
sha256_final8x(&ctx,
outbufx8[0],
outbufx8[1],
outbufx8[2],
outbufx8[3],
outbufx8[4],
outbufx8[5],
outbufx8[6],
outbufx8[7]);
memcpy(out[0], outbufx8[0], n);
memcpy(out[1], outbufx8[1], n);
memcpy(out[2], outbufx8[2], n);
memcpy(out[3], outbufx8[3], n);
memcpy(out[4], outbufx8[4], n);
memcpy(out[5], outbufx8[5], n);
memcpy(out[6], outbufx8[6], n);
memcpy(out[7], outbufx8[7], n);
}
// prf_msg is defined as HMAC( prf, opt_rand || msg )
void sha256_hash::prf_msg( unsigned char *result,
const unsigned char *opt_rand,
const unsigned char *msg, size_t len_msg ) {
SHA256_CTX ctx;
unsigned char block[sha256_block_size];
unsigned char hash_output[sha256_output_size];
size_t n = len_hash();
const unsigned char* prf = get_prf();
// Do the inner hash
ctx.init();
for (size_t i=0; i<n; i++) {
block[i] = 0x36 ^ prf[i];
}
memset( &block[n], 0x36, sha256_block_size-n );
ctx.update( block, sha256_block_size );
ctx.update( opt_rand, n );
ctx.update( msg, len_msg );
ctx.final(hash_output);
// Do the outer hash
ctx.init();
for (size_t i=0; i<n; i++) {
block[i] = 0x5c ^ prf[i];
}
memset( &block[n], 0x5c, sha256_block_size-n );
ctx.update( block, sha256_block_size );
ctx.update( hash_output, sha256_output_size );
ctx.final( hash_output );
memcpy( result, hash_output, n );
zeroize( block, sizeof block ); // prf is supposed to be secret
ctx.zeroize();
}
// Here, len_result is not the size of the buffer (which it is in most
// similar contexts); instead, it is the number of output bytes desired
void sha256_hash::h_msg( unsigned char *result, size_t len_result,
const unsigned char *r,
const unsigned char *msg, size_t len_msg ) {
unsigned char msg_hash[ sha256_output_size + 2*max_len_hash ];
size_t n = len_hash();
const unsigned char *pk_seed = get_public_seed();
const unsigned char *pk_root = get_root();
SHA256_CTX ctx;
ctx.init();
ctx.update(r, n);
ctx.update(pk_seed, n);
ctx.update(pk_root, n);
ctx.update(msg, len_msg);
ctx.final(msg_hash + 2*n);
// Now do the outer MGF1
memcpy( msg_hash, r, n );
memcpy( msg_hash+n, pk_seed, n );
mgf1<SHA256_CTX> stream( msg_hash, 2*n + sha256_output_size );
stream.output( result, len_result );
}
unsigned sha256_hash::num_track(void) {
return 8;
}
unsigned sha256_hash::num_log_track(void) {
return 3;
}
sha256_hash::sha256_hash(void) {
// We initialize the offset parameters to SHA-256 specific values
offset_layer = 0;
offset_tree = 1;
offset_type = 9;
offset_kp_addr1 = 13;
offset_kp_addr2 = 12;
offset_chain_addr = 17;
offset_hash_addr = 21;
offset_tree_hgt = 17;
offset_tree_index = 18;
}
} /* namespace sphincs_plus */