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/*
* Copyright 2023-2023 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 "crypto/bn.h"
#include "crypto/s390x_arch.h"
#ifdef S390X_MOD_EXP
# include <sys/types.h>
# include <sys/stat.h>
# include <fcntl.h>
# include <asm/zcrypt.h>
# include <sys/ioctl.h>
# include <unistd.h>
# include <errno.h>
static int s390x_mod_exp_hw(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
const BIGNUM *m)
{
struct ica_rsa_modexpo me;
unsigned char *buffer;
size_t size;
int res = 0;
if (OPENSSL_s390xcex == -1)
return 0;
size = BN_num_bytes(m);
buffer = OPENSSL_zalloc(4 * size);
if (buffer == NULL)
return 0;
me.inputdata = buffer;
me.inputdatalength = size;
me.outputdata = buffer + size;
me.outputdatalength = size;
me.b_key = buffer + 2 * size;
me.n_modulus = buffer + 3 * size;
if (BN_bn2binpad(a, me.inputdata, size) == -1
|| BN_bn2binpad(p, me.b_key, size) == -1
|| BN_bn2binpad(m, me.n_modulus, size) == -1)
goto dealloc;
if (ioctl(OPENSSL_s390xcex, ICARSAMODEXPO, &me) != -1) {
if (BN_bin2bn(me.outputdata, size, r) != NULL)
res = 1;
} else if (errno == EBADF) {
/*-
* In this cases, someone (e.g. a sandbox) closed the fd.
* Make sure to not further use this hardware acceleration.
*/
OPENSSL_s390xcex = -1;
}
dealloc:
OPENSSL_clear_free(buffer, 4 * size);
return res;
}
int s390x_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
{
if (s390x_mod_exp_hw(r, a, p, m) == 1)
return 1;
return BN_mod_exp_mont(r, a, p, m, ctx, m_ctx);
}
int s390x_crt(BIGNUM *r, const BIGNUM *i, const BIGNUM *p, const BIGNUM *q,
const BIGNUM *dmp, const BIGNUM *dmq, const BIGNUM *iqmp)
{
struct ica_rsa_modexpo_crt crt;
unsigned char *buffer, *part;
size_t size, plen, qlen;
int res = 0;
if (OPENSSL_s390xcex == -1)
return 0;
/*-
* Hardware-accelerated CRT can only deal with p>q. Fall back to
* software in the (hopefully rare) other cases.
*/
if (BN_ucmp(p, q) != 1)
return 0;
plen = BN_num_bytes(p);
qlen = BN_num_bytes(q);
size = (plen > qlen ? plen : qlen);
buffer = OPENSSL_zalloc(9 * size + 24);
if (buffer == NULL)
return 0;
part = buffer;
crt.inputdata = part;
crt.inputdatalength = 2 * size;
part += 2 * size;
crt.outputdata = part;
crt.outputdatalength = 2 * size;
part += 2 * size;
crt.bp_key = part;
part += size + 8;
crt.bq_key = part;
part += size;
crt.np_prime = part;
part += size + 8;
crt.nq_prime = part;
part += size;
crt.u_mult_inv = part;
if (BN_bn2binpad(i, crt.inputdata, crt.inputdatalength) == -1
|| BN_bn2binpad(p, crt.np_prime, size + 8) == -1
|| BN_bn2binpad(q, crt.nq_prime, size) == -1
|| BN_bn2binpad(dmp, crt.bp_key, size + 8) == -1
|| BN_bn2binpad(dmq, crt.bq_key, size) == -1
|| BN_bn2binpad(iqmp, crt.u_mult_inv, size + 8) == -1)
goto dealloc;
if (ioctl(OPENSSL_s390xcex, ICARSACRT, &crt) != -1) {
if (BN_bin2bn(crt.outputdata, crt.outputdatalength, r) != NULL)
res = 1;
} else if (errno == EBADF) {
/*-
* In this cases, someone (e.g. a sandbox) closed the fd.
* Make sure to not further use this hardware acceleration.
*/
OPENSSL_s390xcex = -1;
}
dealloc:
OPENSSL_clear_free(buffer, 9 * size + 24);
return res;
}
#else
int s390x_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
{
return BN_mod_exp_mont(r, a, p, m, ctx, m_ctx);
}
int s390x_crt(BIGNUM *r, const BIGNUM *i, const BIGNUM *p, const BIGNUM *q,
const BIGNUM *dmp, const BIGNUM *dmq, const BIGNUM *iqmp)
{
return 0;
}
#endif
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