[331] | 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include <openssl/crypto.h>
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| 12 | #include "internal/cryptlib.h"
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| 13 | #include <openssl/lhash.h>
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| 14 | #include "internal/bn_int.h"
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| 15 | #include <openssl/rand.h>
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| 16 | #include "rsa_locl.h"
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| 17 |
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| 18 | int RSA_bits(const RSA *r)
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| 19 | {
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| 20 | return (BN_num_bits(r->n));
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| 21 | }
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| 22 |
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| 23 | int RSA_size(const RSA *r)
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| 24 | {
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| 25 | return (BN_num_bytes(r->n));
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| 26 | }
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| 27 |
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| 28 | int RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to,
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| 29 | RSA *rsa, int padding)
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| 30 | {
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| 31 | return (rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding));
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| 32 | }
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| 33 |
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| 34 | int RSA_private_encrypt(int flen, const unsigned char *from,
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| 35 | unsigned char *to, RSA *rsa, int padding)
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| 36 | {
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| 37 | return (rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding));
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| 38 | }
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| 39 |
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| 40 | int RSA_private_decrypt(int flen, const unsigned char *from,
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| 41 | unsigned char *to, RSA *rsa, int padding)
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| 42 | {
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| 43 | return (rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding));
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| 44 | }
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| 45 |
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| 46 | int RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to,
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| 47 | RSA *rsa, int padding)
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| 48 | {
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| 49 | return (rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding));
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| 50 | }
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| 51 |
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| 52 | int RSA_flags(const RSA *r)
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| 53 | {
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| 54 | return ((r == NULL) ? 0 : r->meth->flags);
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| 55 | }
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| 56 |
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| 57 | void RSA_blinding_off(RSA *rsa)
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| 58 | {
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| 59 | BN_BLINDING_free(rsa->blinding);
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| 60 | rsa->blinding = NULL;
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| 61 | rsa->flags &= ~RSA_FLAG_BLINDING;
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| 62 | rsa->flags |= RSA_FLAG_NO_BLINDING;
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| 63 | }
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| 64 |
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| 65 | int RSA_blinding_on(RSA *rsa, BN_CTX *ctx)
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| 66 | {
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| 67 | int ret = 0;
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| 68 |
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| 69 | if (rsa->blinding != NULL)
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| 70 | RSA_blinding_off(rsa);
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| 71 |
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| 72 | rsa->blinding = RSA_setup_blinding(rsa, ctx);
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| 73 | if (rsa->blinding == NULL)
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| 74 | goto err;
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| 75 |
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| 76 | rsa->flags |= RSA_FLAG_BLINDING;
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| 77 | rsa->flags &= ~RSA_FLAG_NO_BLINDING;
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| 78 | ret = 1;
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| 79 | err:
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| 80 | return (ret);
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| 81 | }
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| 82 |
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| 83 | static BIGNUM *rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p,
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| 84 | const BIGNUM *q, BN_CTX *ctx)
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| 85 | {
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| 86 | BIGNUM *ret = NULL, *r0, *r1, *r2;
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| 87 |
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| 88 | if (d == NULL || p == NULL || q == NULL)
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| 89 | return NULL;
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| 90 |
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| 91 | BN_CTX_start(ctx);
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| 92 | r0 = BN_CTX_get(ctx);
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| 93 | r1 = BN_CTX_get(ctx);
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| 94 | r2 = BN_CTX_get(ctx);
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| 95 | if (r2 == NULL)
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| 96 | goto err;
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| 97 |
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| 98 | if (!BN_sub(r1, p, BN_value_one()))
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| 99 | goto err;
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| 100 | if (!BN_sub(r2, q, BN_value_one()))
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| 101 | goto err;
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| 102 | if (!BN_mul(r0, r1, r2, ctx))
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| 103 | goto err;
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| 104 |
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| 105 | ret = BN_mod_inverse(NULL, d, r0, ctx);
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| 106 | err:
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| 107 | BN_CTX_end(ctx);
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| 108 | return ret;
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| 109 | }
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| 110 |
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| 111 | BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx)
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| 112 | {
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| 113 | BIGNUM *e;
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| 114 | BN_CTX *ctx;
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| 115 | BN_BLINDING *ret = NULL;
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| 116 |
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| 117 | if (in_ctx == NULL) {
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| 118 | if ((ctx = BN_CTX_new()) == NULL)
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| 119 | return 0;
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| 120 | } else
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| 121 | ctx = in_ctx;
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| 122 |
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| 123 | BN_CTX_start(ctx);
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| 124 | e = BN_CTX_get(ctx);
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| 125 | if (e == NULL) {
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| 126 | RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE);
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| 127 | goto err;
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| 128 | }
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| 129 |
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| 130 | if (rsa->e == NULL) {
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| 131 | e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx);
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| 132 | if (e == NULL) {
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| 133 | RSAerr(RSA_F_RSA_SETUP_BLINDING, RSA_R_NO_PUBLIC_EXPONENT);
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| 134 | goto err;
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| 135 | }
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| 136 | } else
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| 137 | e = rsa->e;
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| 138 |
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| 139 | if ((RAND_status() == 0) && rsa->d != NULL
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| 140 | && bn_get_words(rsa->d) != NULL) {
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| 141 | /*
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| 142 | * if PRNG is not properly seeded, resort to secret exponent as
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| 143 | * unpredictable seed
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| 144 | */
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| 145 | RAND_add(bn_get_words(rsa->d), bn_get_dmax(rsa->d) * sizeof(BN_ULONG),
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| 146 | 0.0);
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| 147 | }
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| 148 |
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| 149 | {
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| 150 | BIGNUM *n = BN_new();
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| 151 |
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| 152 | if (n == NULL) {
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| 153 | RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_MALLOC_FAILURE);
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| 154 | goto err;
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| 155 | }
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| 156 | BN_with_flags(n, rsa->n, BN_FLG_CONSTTIME);
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| 157 |
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| 158 | ret = BN_BLINDING_create_param(NULL, e, n, ctx, rsa->meth->bn_mod_exp,
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| 159 | rsa->_method_mod_n);
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| 160 | /* We MUST free n before any further use of rsa->n */
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| 161 | BN_free(n);
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| 162 | }
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| 163 | if (ret == NULL) {
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| 164 | RSAerr(RSA_F_RSA_SETUP_BLINDING, ERR_R_BN_LIB);
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| 165 | goto err;
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| 166 | }
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| 167 |
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| 168 | BN_BLINDING_set_current_thread(ret);
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| 169 |
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| 170 | err:
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| 171 | BN_CTX_end(ctx);
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| 172 | if (ctx != in_ctx)
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| 173 | BN_CTX_free(ctx);
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| 174 | if (e != rsa->e)
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| 175 | BN_free(e);
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| 176 |
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| 177 | return ret;
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| 178 | }
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