170 lines
3.9 KiB
C
170 lines
3.9 KiB
C
/*
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* Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include <openssl/crypto.h>
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#include "internal/cryptlib.h"
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#include "crypto/bn.h"
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#include <openssl/rand.h>
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#include "rsa_local.h"
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int RSA_bits(const RSA *r)
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{
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return BN_num_bits(r->n);
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}
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int RSA_size(const RSA *r)
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{
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return BN_num_bytes(r->n);
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}
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int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to,
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RSA *rsa, int padding)
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{
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return rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding);
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}
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int RSA_private_encrypt(int flen, const unsigned char *from,
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unsigned char *to, RSA *rsa, int padding)
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{
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return rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding);
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}
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int RSA_private_decrypt(int flen, const unsigned char *from,
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unsigned char *to, RSA *rsa, int padding)
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{
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return rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding);
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}
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int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to,
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RSA *rsa, int padding)
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{
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return rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding);
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}
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int RSA_flags(const RSA *r)
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{
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return r == NULL ? 0 : r->meth->flags;
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}
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void RSA_blinding_off(RSA *rsa)
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{
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BN_BLINDING_free(rsa->blinding);
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rsa->blinding = NULL;
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rsa->flags &= ~RSA_FLAG_BLINDING;
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rsa->flags |= RSA_FLAG_NO_BLINDING;
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}
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int RSA_blinding_on(RSA *rsa, BN_CTX *ctx)
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{
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int ret = 0;
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if (rsa->blinding != NULL)
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RSA_blinding_off(rsa);
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rsa->blinding = RSA_setup_blinding(rsa, ctx);
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if (rsa->blinding == NULL)
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goto err;
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rsa->flags |= RSA_FLAG_BLINDING;
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rsa->flags &= ~RSA_FLAG_NO_BLINDING;
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ret = 1;
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err:
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return ret;
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}
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static BIGNUM *rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p,
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const BIGNUM *q, BN_CTX *ctx)
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{
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BIGNUM *ret = NULL, *r0, *r1, *r2;
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if (d == NULL || p == NULL || q == NULL)
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return NULL;
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BN_CTX_start(ctx);
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r0 = BN_CTX_get(ctx);
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r1 = BN_CTX_get(ctx);
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r2 = BN_CTX_get(ctx);
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if (r2 == NULL)
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goto err;
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if (!BN_sub(r1, p, BN_value_one()))
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goto err;
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if (!BN_sub(r2, q, BN_value_one()))
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goto err;
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if (!BN_mul(r0, r1, r2, ctx))
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goto err;
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ret = BN_mod_inverse(NULL, d, r0, ctx);
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err:
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BN_CTX_end(ctx);
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return ret;
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}
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BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx)
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{
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BIGNUM *e;
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BN_CTX *ctx;
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BN_BLINDING *ret = NULL;
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if (in_ctx == NULL) {
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if ((ctx = BN_CTX_new()) == NULL)
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return 0;
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} else {
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ctx = in_ctx;
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}
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BN_CTX_start(ctx);
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e = BN_CTX_get(ctx);
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if (e == NULL) {
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RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (rsa->e == NULL) {
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e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx);
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if (e == NULL) {
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RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT);
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goto err;
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}
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} else {
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e = rsa->e;
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}
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{
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BIGNUM *n = BN_new();
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if (n == NULL) {
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RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME);
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ret = BN_BLINDING_create_param(NULL, e, n, ctx, rsa->meth->bn_mod_exp,
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rsa->_method_mod_n);
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/* We MUST free n before any further use of rsa->n */
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BN_free(n);
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}
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if (ret == NULL) {
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RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB);
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goto err;
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}
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BN_BLINDING_set_current_thread(ret);
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err:
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BN_CTX_end(ctx);
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if (ctx != in_ctx)
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BN_CTX_free(ctx);
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if (e != rsa->e)
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BN_free(e);
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return ret;
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}
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