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- /*
- * Copyright 1995-2020 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
- */
- /*
- * RSA low level APIs are deprecated for public use, but still ok for
- * internal use.
- */
- #include "internal/deprecated.h"
- #include <stdio.h>
- #include <openssl/crypto.h>
- #include "internal/cryptlib.h"
- #include "crypto/bn.h"
- #include <openssl/rand.h>
- #include "rsa_local.h"
- int RSA_bits(const RSA *r)
- {
- return BN_num_bits(r->n);
- }
- int RSA_size(const RSA *r)
- {
- return BN_num_bytes(r->n);
- }
- int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to,
- RSA *rsa, int padding)
- {
- return rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding);
- }
- int RSA_private_encrypt(int flen, const unsigned char *from,
- unsigned char *to, RSA *rsa, int padding)
- {
- return rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding);
- }
- int RSA_private_decrypt(int flen, const unsigned char *from,
- unsigned char *to, RSA *rsa, int padding)
- {
- return rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding);
- }
- int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to,
- RSA *rsa, int padding)
- {
- return rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding);
- }
- int RSA_flags(const RSA *r)
- {
- return r == NULL ? 0 : r->meth->flags;
- }
- void RSA_blinding_off(RSA *rsa)
- {
- BN_BLINDING_free(rsa->blinding);
- rsa->blinding = NULL;
- rsa->flags &= ~RSA_FLAG_BLINDING;
- rsa->flags |= RSA_FLAG_NO_BLINDING;
- }
- int RSA_blinding_on(RSA *rsa, BN_CTX *ctx)
- {
- int ret = 0;
- if (rsa->blinding != NULL)
- RSA_blinding_off(rsa);
- rsa->blinding = RSA_setup_blinding(rsa, ctx);
- if (rsa->blinding == NULL)
- goto err;
- rsa->flags |= RSA_FLAG_BLINDING;
- rsa->flags &= ~RSA_FLAG_NO_BLINDING;
- ret = 1;
- err:
- return ret;
- }
- static BIGNUM *rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p,
- const BIGNUM *q, BN_CTX *ctx)
- {
- BIGNUM *ret = NULL, *r0, *r1, *r2;
- if (d == NULL || p == NULL || q == NULL)
- return NULL;
- BN_CTX_start(ctx);
- r0 = BN_CTX_get(ctx);
- r1 = BN_CTX_get(ctx);
- r2 = BN_CTX_get(ctx);
- if (r2 == NULL)
- goto err;
- if (!BN_sub(r1, p, BN_value_one()))
- goto err;
- if (!BN_sub(r2, q, BN_value_one()))
- goto err;
- if (!BN_mul(r0, r1, r2, ctx))
- goto err;
- ret = BN_mod_inverse(NULL, d, r0, ctx);
- err:
- BN_CTX_end(ctx);
- return ret;
- }
- BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx)
- {
- BIGNUM *e;
- BN_CTX *ctx;
- BN_BLINDING *ret = NULL;
- if (in_ctx == NULL) {
- if ((ctx = BN_CTX_new_ex(rsa->libctx)) == NULL)
- return 0;
- } else {
- ctx = in_ctx;
- }
- BN_CTX_start(ctx);
- e = BN_CTX_get(ctx);
- if (e == NULL) {
- ERR_raise(ERR_LIB_RSA, ERR_R_BN_LIB);
- goto err;
- }
- if (rsa->e == NULL) {
- e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx);
- if (e == NULL) {
- ERR_raise(ERR_LIB_RSA, RSA_R_NO_PUBLIC_EXPONENT);
- goto err;
- }
- } else {
- e = rsa->e;
- }
- {
- BIGNUM *n = BN_new();
- if (n == NULL) {
- ERR_raise(ERR_LIB_RSA, ERR_R_BN_LIB);
- goto err;
- }
- BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME);
- ret = BN_BLINDING_create_param(NULL, e, n, ctx, rsa->meth->bn_mod_exp,
- rsa->_method_mod_n);
- /* We MUST free n before any further use of rsa->n */
- BN_free(n);
- }
- if (ret == NULL) {
- ERR_raise(ERR_LIB_RSA, ERR_R_BN_LIB);
- goto err;
- }
- BN_BLINDING_set_current_thread(ret);
- err:
- BN_CTX_end(ctx);
- if (ctx != in_ctx)
- BN_CTX_free(ctx);
- if (e != rsa->e)
- BN_free(e);
- return ret;
- }
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