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/*
* Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/ec.h>
#include <openssl/rand.h>
#include "crypto/ecx.h"
#include "ec_local.h"
#include "curve448/curve448_local.h"
#include "ecx_backend.h"
#include "s390x_arch.h"
#include "internal/constant_time.h"
static void s390x_x25519_mod_p(unsigned char u[32])
{
unsigned char u_red[32];
unsigned int c = 0;
int i;
memcpy(u_red, u, sizeof(u_red));
c += (unsigned int)u_red[31] + 19;
u_red[31] = (unsigned char)c;
c >>= 8;
for (i = 30; i >= 0; i--) {
c += (unsigned int)u_red[i];
u_red[i] = (unsigned char)c;
c >>= 8;
}
c = (u_red[0] & 0x80) >> 7;
u_red[0] &= 0x7f;
constant_time_cond_swap_buff(0 - (unsigned char)c,
u, u_red, sizeof(u_red));
}
static void s390x_x448_mod_p(unsigned char u[56])
{
unsigned char u_red[56];
unsigned int c = 0;
int i;
memcpy(u_red, u, sizeof(u_red));
c += (unsigned int)u_red[55] + 1;
u_red[55] = (unsigned char)c;
c >>= 8;
for (i = 54; i >= 28; i--) {
c += (unsigned int)u_red[i];
u_red[i] = (unsigned char)c;
c >>= 8;
}
c += (unsigned int)u_red[27] + 1;
u_red[27] = (unsigned char)c;
c >>= 8;
for (i = 26; i >= 0; i--) {
c += (unsigned int)u_red[i];
u_red[i] = (unsigned char)c;
c >>= 8;
}
constant_time_cond_swap_buff(0 - (unsigned char)c,
u, u_red, sizeof(u_red));
}
int s390x_x25519_mul(unsigned char u_dst[32],
const unsigned char u_src[32],
const unsigned char d_src[32])
{
union {
struct {
unsigned char u_dst[32];
unsigned char u_src[32];
unsigned char d_src[32];
} x25519;
unsigned long long buff[512];
} param;
int rc;
memset(¶m, 0, sizeof(param));
s390x_flip_endian32(param.x25519.u_src, u_src);
param.x25519.u_src[0] &= 0x7f;
s390x_x25519_mod_p(param.x25519.u_src);
s390x_flip_endian32(param.x25519.d_src, d_src);
param.x25519.d_src[31] &= 248;
param.x25519.d_src[0] &= 127;
param.x25519.d_src[0] |= 64;
rc = s390x_pcc(S390X_SCALAR_MULTIPLY_X25519, ¶m.x25519) ? 0 : 1;
if (rc == 1)
s390x_flip_endian32(u_dst, param.x25519.u_dst);
OPENSSL_cleanse(param.x25519.d_src, sizeof(param.x25519.d_src));
return rc;
}
int s390x_x448_mul(unsigned char u_dst[56],
const unsigned char u_src[56],
const unsigned char d_src[56])
{
union {
struct {
unsigned char u_dst[64];
unsigned char u_src[64];
unsigned char d_src[64];
} x448;
unsigned long long buff[512];
} param;
int rc;
memset(¶m, 0, sizeof(param));
memcpy(param.x448.u_src, u_src, 56);
memcpy(param.x448.d_src, d_src, 56);
s390x_flip_endian64(param.x448.u_src, param.x448.u_src);
s390x_x448_mod_p(param.x448.u_src + 8);
s390x_flip_endian64(param.x448.d_src, param.x448.d_src);
param.x448.d_src[63] &= 252;
param.x448.d_src[8] |= 128;
rc = s390x_pcc(S390X_SCALAR_MULTIPLY_X448, ¶m.x448) ? 0 : 1;
if (rc == 1) {
s390x_flip_endian64(param.x448.u_dst, param.x448.u_dst);
memcpy(u_dst, param.x448.u_dst, 56);
}
OPENSSL_cleanse(param.x448.d_src, sizeof(param.x448.d_src));
return rc;
}
int s390x_ed25519_mul(unsigned char x_dst[32],
unsigned char y_dst[32],
const unsigned char x_src[32],
const unsigned char y_src[32],
const unsigned char d_src[32])
{
union {
struct {
unsigned char x_dst[32];
unsigned char y_dst[32];
unsigned char x_src[32];
unsigned char y_src[32];
unsigned char d_src[32];
} ed25519;
unsigned long long buff[512];
} param;
int rc;
memset(¶m, 0, sizeof(param));
s390x_flip_endian32(param.ed25519.x_src, x_src);
s390x_flip_endian32(param.ed25519.y_src, y_src);
s390x_flip_endian32(param.ed25519.d_src, d_src);
rc = s390x_pcc(S390X_SCALAR_MULTIPLY_ED25519, ¶m.ed25519) ? 0 : 1;
if (rc == 1) {
s390x_flip_endian32(x_dst, param.ed25519.x_dst);
s390x_flip_endian32(y_dst, param.ed25519.y_dst);
}
OPENSSL_cleanse(param.ed25519.d_src, sizeof(param.ed25519.d_src));
return rc;
}
int s390x_ed448_mul(unsigned char x_dst[57],
unsigned char y_dst[57],
const unsigned char x_src[57],
const unsigned char y_src[57],
const unsigned char d_src[57])
{
union {
struct {
unsigned char x_dst[64];
unsigned char y_dst[64];
unsigned char x_src[64];
unsigned char y_src[64];
unsigned char d_src[64];
} ed448;
unsigned long long buff[512];
} param;
int rc;
memset(¶m, 0, sizeof(param));
memcpy(param.ed448.x_src, x_src, 57);
memcpy(param.ed448.y_src, y_src, 57);
memcpy(param.ed448.d_src, d_src, 57);
s390x_flip_endian64(param.ed448.x_src, param.ed448.x_src);
s390x_flip_endian64(param.ed448.y_src, param.ed448.y_src);
s390x_flip_endian64(param.ed448.d_src, param.ed448.d_src);
rc = s390x_pcc(S390X_SCALAR_MULTIPLY_ED448, ¶m.ed448) ? 0 : 1;
if (rc == 1) {
s390x_flip_endian64(param.ed448.x_dst, param.ed448.x_dst);
s390x_flip_endian64(param.ed448.y_dst, param.ed448.y_dst);
memcpy(x_dst, param.ed448.x_dst, 57);
memcpy(y_dst, param.ed448.y_dst, 57);
}
OPENSSL_cleanse(param.ed448.d_src, sizeof(param.ed448.d_src));
return rc;
}
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