-/* crypto/rsa/rsa_gen.c */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
+/*
+ * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
*
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
+ * 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
*/
-
-/* NB: these functions have been "upgraded", the deprecated versions (which are
- * compatibility wrappers using these functions) are in rsa_depr.c.
- * - Geoff
+/*
+ * NB: these functions have been "upgraded", the deprecated versions (which
+ * are compatibility wrappers using these functions) are in rsa_depr.c. -
+ * Geoff
*/
-#define OPENSSL_FIPSAPI
+/*
+ * RSA low level APIs are deprecated for public use, but still ok for
+ * internal use.
+ */
+#include "internal/deprecated.h"
#include <stdio.h>
#include <time.h>
-#include "cryptlib.h"
+#include "internal/cryptlib.h"
#include <openssl/bn.h>
-#include <openssl/rsa.h>
-
-#ifdef OPENSSL_FIPS
-
-
-#include <openssl/fips.h>
-#include <openssl/fips_rand.h>
-#include <openssl/evp.h>
-
-/* Check PRNG has sufficient security level to handle an RSA operation */
-
-int fips_check_rsa_prng(RSA *rsa, int bits)
- {
- int strength;
- if (!FIPS_mode())
- return 1;
-
- if (rsa->flags & (RSA_FLAG_NON_FIPS_ALLOW|RSA_FLAG_CHECKED))
- return 1;
-
- if (bits == 0)
- bits = BN_num_bits(rsa->n);
-
- /* Should never happen */
- if (bits < 1024)
- {
- FIPSerr(FIPS_F_FIPS_CHECK_RSA_PRNG,FIPS_R_KEY_TOO_SHORT);
- return 0;
- }
- /* From SP800-57 */
- if (bits < 2048)
- strength = 80;
- else if (bits < 3072)
- strength = 112;
- else if (bits < 7680)
- strength = 128;
- else if (bits < 15360)
- strength = 192;
- else
- strength = 256;
-
- if (FIPS_rand_strength() >= strength)
- return 1;
-
- FIPSerr(FIPS_F_FIPS_CHECK_RSA_PRNG,FIPS_R_PRNG_STRENGTH_TOO_LOW);
- return 0;
- }
-
-
-int fips_check_rsa(RSA *rsa)
- {
- const unsigned char tbs[] = "RSA Pairwise Check Data";
- unsigned char *ctbuf = NULL, *ptbuf = NULL;
- int len, ret = 0;
- EVP_PKEY pk;
- pk.type = EVP_PKEY_RSA;
- pk.pkey.rsa = rsa;
-
- /* Perform pairwise consistency signature test */
- if (!fips_pkey_signature_test(FIPS_TEST_PAIRWISE, &pk, tbs, 0,
- NULL, 0, NULL, RSA_PKCS1_PADDING, NULL)
- || !fips_pkey_signature_test(FIPS_TEST_PAIRWISE, &pk, tbs, 0,
- NULL, 0, NULL, RSA_X931_PADDING, NULL)
- || !fips_pkey_signature_test(FIPS_TEST_PAIRWISE, &pk, tbs, 0,
- NULL, 0, NULL, RSA_PKCS1_PSS_PADDING, NULL))
- goto err;
- /* Now perform pairwise consistency encrypt/decrypt test */
- ctbuf = OPENSSL_malloc(RSA_size(rsa));
- if (!ctbuf)
- goto err;
-
- len = RSA_public_encrypt(sizeof(tbs) - 1, tbs, ctbuf, rsa, RSA_PKCS1_PADDING);
- if (len <= 0)
- goto err;
- /* Check ciphertext doesn't match plaintext */
- if ((len == (sizeof(tbs) - 1)) && !memcmp(tbs, ctbuf, len))
- goto err;
- ptbuf = OPENSSL_malloc(RSA_size(rsa));
-
- if (!ptbuf)
- goto err;
- len = RSA_private_decrypt(len, ctbuf, ptbuf, rsa, RSA_PKCS1_PADDING);
- if (len != (sizeof(tbs) - 1))
- goto err;
- if (memcmp(ptbuf, tbs, len))
- goto err;
-
- ret = 1;
-
- if (!ptbuf)
- goto err;
-
- err:
- if (ret == 0)
- {
- fips_set_selftest_fail();
- FIPSerr(FIPS_F_FIPS_CHECK_RSA,FIPS_R_PAIRWISE_TEST_FAILED);
- }
-
- if (ctbuf)
- OPENSSL_free(ctbuf);
- if (ptbuf)
- OPENSSL_free(ptbuf);
-
- return ret;
- }
-#endif
-
-static int rsa_builtin_keygen(RSA *rsa, int bits, BIGNUM *e_value, BN_GENCB *cb);
-
-/* NB: this wrapper would normally be placed in rsa_lib.c and the static
- * implementation would probably be in rsa_eay.c. Nonetheless, is kept here so
- * that we don't introduce a new linker dependency. Eg. any application that
- * wasn't previously linking object code related to key-generation won't have to
- * now just because key-generation is part of RSA_METHOD. */
+#include <openssl/self_test.h>
+#include "rsa_local.h"
+
+static int rsa_keygen_pairwise_test(RSA *rsa, OSSL_CALLBACK *cb, void *cbarg);
+static int rsa_keygen(OPENSSL_CTX *libctx, RSA *rsa, int bits, int primes,
+ BIGNUM *e_value, BN_GENCB *cb, int pairwise_test);
+
+/*
+ * NB: this wrapper would normally be placed in rsa_lib.c and the static
+ * implementation would probably be in rsa_eay.c. Nonetheless, is kept here
+ * so that we don't introduce a new linker dependency. Eg. any application
+ * that wasn't previously linking object code related to key-generation won't
+ * have to now just because key-generation is part of RSA_METHOD.
+ */
int RSA_generate_key_ex(RSA *rsa, int bits, BIGNUM *e_value, BN_GENCB *cb)
- {
- if(rsa->meth->rsa_keygen)
- return rsa->meth->rsa_keygen(rsa, bits, e_value, cb);
- return rsa_builtin_keygen(rsa, bits, e_value, cb);
- }
-
-static int rsa_builtin_keygen(RSA *rsa, int bits, BIGNUM *e_value, BN_GENCB *cb)
- {
- BIGNUM *r0=NULL,*r1=NULL,*r2=NULL,*r3=NULL,*tmp;
- BIGNUM local_r0,local_d,local_p;
- BIGNUM *pr0,*d,*p;
- int bitsp,bitsq,ok= -1,n=0;
- BN_CTX *ctx=NULL;
-
-#ifdef OPENSSL_FIPS
- if(FIPS_selftest_failed())
- {
- FIPSerr(FIPS_F_RSA_BUILTIN_KEYGEN,FIPS_R_FIPS_SELFTEST_FAILED);
- return 0;
- }
-
- if (FIPS_mode() && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)
- && (bits < OPENSSL_RSA_FIPS_MIN_MODULUS_BITS))
- {
- FIPSerr(FIPS_F_RSA_BUILTIN_KEYGEN,FIPS_R_KEY_TOO_SHORT);
- return 0;
- }
- if (!fips_check_rsa_prng(rsa, bits))
- return 0;
-#endif
-
- ctx=BN_CTX_new();
- if (ctx == NULL) goto err;
- BN_CTX_start(ctx);
- r0 = BN_CTX_get(ctx);
- r1 = BN_CTX_get(ctx);
- r2 = BN_CTX_get(ctx);
- r3 = BN_CTX_get(ctx);
- if (r3 == NULL) goto err;
-
- bitsp=(bits+1)/2;
- bitsq=bits-bitsp;
-
- /* We need the RSA components non-NULL */
- if(!rsa->n && ((rsa->n=BN_new()) == NULL)) goto err;
- if(!rsa->d && ((rsa->d=BN_new()) == NULL)) goto err;
- if(!rsa->e && ((rsa->e=BN_new()) == NULL)) goto err;
- if(!rsa->p && ((rsa->p=BN_new()) == NULL)) goto err;
- if(!rsa->q && ((rsa->q=BN_new()) == NULL)) goto err;
- if(!rsa->dmp1 && ((rsa->dmp1=BN_new()) == NULL)) goto err;
- if(!rsa->dmq1 && ((rsa->dmq1=BN_new()) == NULL)) goto err;
- if(!rsa->iqmp && ((rsa->iqmp=BN_new()) == NULL)) goto err;
-
- BN_copy(rsa->e, e_value);
-
- /* generate p and q */
- for (;;)
- {
- if(!BN_generate_prime_ex(rsa->p, bitsp, 0, NULL, NULL, cb))
- goto err;
- if (!BN_sub(r2,rsa->p,BN_value_one())) goto err;
- if (!BN_gcd(r1,r2,rsa->e,ctx)) goto err;
- if (BN_is_one(r1)) break;
- if(!BN_GENCB_call(cb, 2, n++))
- goto err;
- }
- if(!BN_GENCB_call(cb, 3, 0))
- goto err;
- for (;;)
- {
- /* When generating ridiculously small keys, we can get stuck
- * continually regenerating the same prime values. Check for
- * this and bail if it happens 3 times. */
- unsigned int degenerate = 0;
- do
- {
- if(!BN_generate_prime_ex(rsa->q, bitsq, 0, NULL, NULL, cb))
- goto err;
- } while((BN_cmp(rsa->p, rsa->q) == 0) && (++degenerate < 3));
- if(degenerate == 3)
- {
- ok = 0; /* we set our own err */
- RSAerr(RSA_F_RSA_BUILTIN_KEYGEN,RSA_R_KEY_SIZE_TOO_SMALL);
- goto err;
- }
- if (!BN_sub(r2,rsa->q,BN_value_one())) goto err;
- if (!BN_gcd(r1,r2,rsa->e,ctx)) goto err;
- if (BN_is_one(r1))
- break;
- if(!BN_GENCB_call(cb, 2, n++))
- goto err;
- }
- if(!BN_GENCB_call(cb, 3, 1))
- goto err;
- if (BN_cmp(rsa->p,rsa->q) < 0)
- {
- tmp=rsa->p;
- rsa->p=rsa->q;
- rsa->q=tmp;
- }
-
- /* calculate n */
- if (!BN_mul(rsa->n,rsa->p,rsa->q,ctx)) goto err;
-
- /* calculate d */
- if (!BN_sub(r1,rsa->p,BN_value_one())) goto err; /* p-1 */
- if (!BN_sub(r2,rsa->q,BN_value_one())) goto err; /* q-1 */
- if (!BN_mul(r0,r1,r2,ctx)) goto err; /* (p-1)(q-1) */
- if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
- {
- pr0 = &local_r0;
- BN_with_flags(pr0, r0, BN_FLG_CONSTTIME);
- }
- else
- pr0 = r0;
- if (!BN_mod_inverse(rsa->d,rsa->e,pr0,ctx)) goto err; /* d */
-
- /* set up d for correct BN_FLG_CONSTTIME flag */
- if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
- {
- d = &local_d;
- BN_with_flags(d, rsa->d, BN_FLG_CONSTTIME);
- }
- else
- d = rsa->d;
-
- /* calculate d mod (p-1) */
- if (!BN_mod(rsa->dmp1,d,r1,ctx)) goto err;
-
- /* calculate d mod (q-1) */
- if (!BN_mod(rsa->dmq1,d,r2,ctx)) goto err;
-
- /* calculate inverse of q mod p */
- if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
- {
- p = &local_p;
- BN_with_flags(p, rsa->p, BN_FLG_CONSTTIME);
- }
- else
- p = rsa->p;
- if (!BN_mod_inverse(rsa->iqmp,rsa->q,p,ctx)) goto err;
-
-#ifdef OPENSSL_FIPS
- if(!fips_check_rsa(rsa))
- goto err;
+{
+ if (rsa->meth->rsa_keygen != NULL)
+ return rsa->meth->rsa_keygen(rsa, bits, e_value, cb);
+
+ return RSA_generate_multi_prime_key(rsa, bits, RSA_DEFAULT_PRIME_NUM,
+ e_value, cb);
+}
+
+int RSA_generate_multi_prime_key(RSA *rsa, int bits, int primes,
+ BIGNUM *e_value, BN_GENCB *cb)
+{
+#ifndef FIPS_MODULE
+ /* multi-prime is only supported with the builtin key generation */
+ if (rsa->meth->rsa_multi_prime_keygen != NULL) {
+ return rsa->meth->rsa_multi_prime_keygen(rsa, bits, primes,
+ e_value, cb);
+ } else if (rsa->meth->rsa_keygen != NULL) {
+ /*
+ * However, if rsa->meth implements only rsa_keygen, then we
+ * have to honour it in 2-prime case and assume that it wouldn't
+ * know what to do with multi-prime key generated by builtin
+ * subroutine...
+ */
+ if (primes == 2)
+ return rsa->meth->rsa_keygen(rsa, bits, e_value, cb);
+ else
+ return 0;
+ }
+#endif /* FIPS_MODUKE */
+ return rsa_keygen(rsa->libctx, rsa, bits, primes, e_value, cb, 0);
+}
+
+#ifndef FIPS_MODULE
+static int rsa_multiprime_keygen(RSA *rsa, int bits, int primes,
+ BIGNUM *e_value, BN_GENCB *cb)
+{
+ BIGNUM *r0 = NULL, *r1 = NULL, *r2 = NULL, *tmp, *prime;
+ int n = 0, bitsr[RSA_MAX_PRIME_NUM], bitse = 0;
+ int i = 0, quo = 0, rmd = 0, adj = 0, retries = 0;
+ RSA_PRIME_INFO *pinfo = NULL;
+ STACK_OF(RSA_PRIME_INFO) *prime_infos = NULL;
+ BN_CTX *ctx = NULL;
+ BN_ULONG bitst = 0;
+ unsigned long error = 0;
+ int ok = -1;
+
+ if (bits < RSA_MIN_MODULUS_BITS) {
+ ok = 0; /* we set our own err */
+ RSAerr(0, RSA_R_KEY_SIZE_TOO_SMALL);
+ goto err;
+ }
+
+ /* A bad value for e can cause infinite loops */
+ if (e_value != NULL && !rsa_check_public_exponent(e_value)) {
+ RSAerr(0, RSA_R_PUB_EXPONENT_OUT_OF_RANGE);
+ return 0;
+ }
+
+ if (primes < RSA_DEFAULT_PRIME_NUM || primes > rsa_multip_cap(bits)) {
+ ok = 0; /* we set our own err */
+ RSAerr(0, RSA_R_KEY_PRIME_NUM_INVALID);
+ goto err;
+ }
+
+ ctx = BN_CTX_new();
+ if (ctx == NULL)
+ goto err;
+ BN_CTX_start(ctx);
+ r0 = BN_CTX_get(ctx);
+ r1 = BN_CTX_get(ctx);
+ r2 = BN_CTX_get(ctx);
+ if (r2 == NULL)
+ goto err;
+
+ /* divide bits into 'primes' pieces evenly */
+ quo = bits / primes;
+ rmd = bits % primes;
+
+ for (i = 0; i < primes; i++)
+ bitsr[i] = (i < rmd) ? quo + 1 : quo;
+
+ rsa->dirty_cnt++;
+
+ /* We need the RSA components non-NULL */
+ if (!rsa->n && ((rsa->n = BN_new()) == NULL))
+ goto err;
+ if (!rsa->d && ((rsa->d = BN_secure_new()) == NULL))
+ goto err;
+ BN_set_flags(rsa->d, BN_FLG_CONSTTIME);
+ if (!rsa->e && ((rsa->e = BN_new()) == NULL))
+ goto err;
+ if (!rsa->p && ((rsa->p = BN_secure_new()) == NULL))
+ goto err;
+ BN_set_flags(rsa->p, BN_FLG_CONSTTIME);
+ if (!rsa->q && ((rsa->q = BN_secure_new()) == NULL))
+ goto err;
+ BN_set_flags(rsa->q, BN_FLG_CONSTTIME);
+ if (!rsa->dmp1 && ((rsa->dmp1 = BN_secure_new()) == NULL))
+ goto err;
+ BN_set_flags(rsa->dmp1, BN_FLG_CONSTTIME);
+ if (!rsa->dmq1 && ((rsa->dmq1 = BN_secure_new()) == NULL))
+ goto err;
+ BN_set_flags(rsa->dmq1, BN_FLG_CONSTTIME);
+ if (!rsa->iqmp && ((rsa->iqmp = BN_secure_new()) == NULL))
+ goto err;
+ BN_set_flags(rsa->iqmp, BN_FLG_CONSTTIME);
+
+ /* initialize multi-prime components */
+ if (primes > RSA_DEFAULT_PRIME_NUM) {
+ rsa->version = RSA_ASN1_VERSION_MULTI;
+ prime_infos = sk_RSA_PRIME_INFO_new_reserve(NULL, primes - 2);
+ if (prime_infos == NULL)
+ goto err;
+ if (rsa->prime_infos != NULL) {
+ /* could this happen? */
+ sk_RSA_PRIME_INFO_pop_free(rsa->prime_infos, rsa_multip_info_free);
+ }
+ rsa->prime_infos = prime_infos;
+
+ /* prime_info from 2 to |primes| -1 */
+ for (i = 2; i < primes; i++) {
+ pinfo = rsa_multip_info_new();
+ if (pinfo == NULL)
+ goto err;
+ (void)sk_RSA_PRIME_INFO_push(prime_infos, pinfo);
+ }
+ }
+
+ if (BN_copy(rsa->e, e_value) == NULL)
+ goto err;
+
+ /* generate p, q and other primes (if any) */
+ for (i = 0; i < primes; i++) {
+ adj = 0;
+ retries = 0;
+
+ if (i == 0) {
+ prime = rsa->p;
+ } else if (i == 1) {
+ prime = rsa->q;
+ } else {
+ pinfo = sk_RSA_PRIME_INFO_value(prime_infos, i - 2);
+ prime = pinfo->r;
+ }
+ BN_set_flags(prime, BN_FLG_CONSTTIME);
+
+ for (;;) {
+ redo:
+ if (!BN_generate_prime_ex(prime, bitsr[i] + adj, 0, NULL, NULL, cb))
+ goto err;
+ /*
+ * prime should not be equal to p, q, r_3...
+ * (those primes prior to this one)
+ */
+ {
+ int j;
+
+ for (j = 0; j < i; j++) {
+ BIGNUM *prev_prime;
+
+ if (j == 0)
+ prev_prime = rsa->p;
+ else if (j == 1)
+ prev_prime = rsa->q;
+ else
+ prev_prime = sk_RSA_PRIME_INFO_value(prime_infos,
+ j - 2)->r;
+
+ if (!BN_cmp(prime, prev_prime)) {
+ goto redo;
+ }
+ }
+ }
+ if (!BN_sub(r2, prime, BN_value_one()))
+ goto err;
+ ERR_set_mark();
+ BN_set_flags(r2, BN_FLG_CONSTTIME);
+ if (BN_mod_inverse(r1, r2, rsa->e, ctx) != NULL) {
+ /* GCD == 1 since inverse exists */
+ break;
+ }
+ error = ERR_peek_last_error();
+ if (ERR_GET_LIB(error) == ERR_LIB_BN
+ && ERR_GET_REASON(error) == BN_R_NO_INVERSE) {
+ /* GCD != 1 */
+ ERR_pop_to_mark();
+ } else {
+ goto err;
+ }
+ if (!BN_GENCB_call(cb, 2, n++))
+ goto err;
+ }
+
+ bitse += bitsr[i];
+
+ /* calculate n immediately to see if it's sufficient */
+ if (i == 1) {
+ /* we get at least 2 primes */
+ if (!BN_mul(r1, rsa->p, rsa->q, ctx))
+ goto err;
+ } else if (i != 0) {
+ /* modulus n = p * q * r_3 * r_4 ... */
+ if (!BN_mul(r1, rsa->n, prime, ctx))
+ goto err;
+ } else {
+ /* i == 0, do nothing */
+ if (!BN_GENCB_call(cb, 3, i))
+ goto err;
+ continue;
+ }
+ /*
+ * if |r1|, product of factors so far, is not as long as expected
+ * (by checking the first 4 bits are less than 0x9 or greater than
+ * 0xF). If so, re-generate the last prime.
+ *
+ * NOTE: This actually can't happen in two-prime case, because of
+ * the way factors are generated.
+ *
+ * Besides, another consideration is, for multi-prime case, even the
+ * length modulus is as long as expected, the modulus could start at
+ * 0x8, which could be utilized to distinguish a multi-prime private
+ * key by using the modulus in a certificate. This is also covered
+ * by checking the length should not be less than 0x9.
+ */
+ if (!BN_rshift(r2, r1, bitse - 4))
+ goto err;
+ bitst = BN_get_word(r2);
+
+ if (bitst < 0x9 || bitst > 0xF) {
+ /*
+ * For keys with more than 4 primes, we attempt longer factor to
+ * meet length requirement.
+ *
+ * Otherwise, we just re-generate the prime with the same length.
+ *
+ * This strategy has the following goals:
+ *
+ * 1. 1024-bit factors are efficient when using 3072 and 4096-bit key
+ * 2. stay the same logic with normal 2-prime key
+ */
+ bitse -= bitsr[i];
+ if (!BN_GENCB_call(cb, 2, n++))
+ goto err;
+ if (primes > 4) {
+ if (bitst < 0x9)
+ adj++;
+ else
+ adj--;
+ } else if (retries == 4) {
+ /*
+ * re-generate all primes from scratch, mainly used
+ * in 4 prime case to avoid long loop. Max retry times
+ * is set to 4.
+ */
+ i = -1;
+ bitse = 0;
+ continue;
+ }
+ retries++;
+ goto redo;
+ }
+ /* save product of primes for further use, for multi-prime only */
+ if (i > 1 && BN_copy(pinfo->pp, rsa->n) == NULL)
+ goto err;
+ if (BN_copy(rsa->n, r1) == NULL)
+ goto err;
+ if (!BN_GENCB_call(cb, 3, i))
+ goto err;
+ }
+
+ if (BN_cmp(rsa->p, rsa->q) < 0) {
+ tmp = rsa->p;
+ rsa->p = rsa->q;
+ rsa->q = tmp;
+ }
+
+ /* calculate d */
+
+ /* p - 1 */
+ if (!BN_sub(r1, rsa->p, BN_value_one()))
+ goto err;
+ /* q - 1 */
+ if (!BN_sub(r2, rsa->q, BN_value_one()))
+ goto err;
+ /* (p - 1)(q - 1) */
+ if (!BN_mul(r0, r1, r2, ctx))
+ goto err;
+ /* multi-prime */
+ for (i = 2; i < primes; i++) {
+ pinfo = sk_RSA_PRIME_INFO_value(prime_infos, i - 2);
+ /* save r_i - 1 to pinfo->d temporarily */
+ if (!BN_sub(pinfo->d, pinfo->r, BN_value_one()))
+ goto err;
+ if (!BN_mul(r0, r0, pinfo->d, ctx))
+ goto err;
+ }
+
+ {
+ BIGNUM *pr0 = BN_new();
+
+ if (pr0 == NULL)
+ goto err;
+
+ BN_with_flags(pr0, r0, BN_FLG_CONSTTIME);
+ if (!BN_mod_inverse(rsa->d, rsa->e, pr0, ctx)) {
+ BN_free(pr0);
+ goto err; /* d */
+ }
+ /* We MUST free pr0 before any further use of r0 */
+ BN_free(pr0);
+ }
+
+ {
+ BIGNUM *d = BN_new();
+
+ if (d == NULL)
+ goto err;
+
+ BN_with_flags(d, rsa->d, BN_FLG_CONSTTIME);
+
+ /* calculate d mod (p-1) and d mod (q - 1) */
+ if (!BN_mod(rsa->dmp1, d, r1, ctx)
+ || !BN_mod(rsa->dmq1, d, r2, ctx)) {
+ BN_free(d);
+ goto err;
+ }
+
+ /* calculate CRT exponents */
+ for (i = 2; i < primes; i++) {
+ pinfo = sk_RSA_PRIME_INFO_value(prime_infos, i - 2);
+ /* pinfo->d == r_i - 1 */
+ if (!BN_mod(pinfo->d, d, pinfo->d, ctx)) {
+ BN_free(d);
+ goto err;
+ }
+ }
+
+ /* We MUST free d before any further use of rsa->d */
+ BN_free(d);
+ }
+
+ {
+ BIGNUM *p = BN_new();
+
+ if (p == NULL)
+ goto err;
+ BN_with_flags(p, rsa->p, BN_FLG_CONSTTIME);
+
+ /* calculate inverse of q mod p */
+ if (!BN_mod_inverse(rsa->iqmp, rsa->q, p, ctx)) {
+ BN_free(p);
+ goto err;
+ }
+
+ /* calculate CRT coefficient for other primes */
+ for (i = 2; i < primes; i++) {
+ pinfo = sk_RSA_PRIME_INFO_value(prime_infos, i - 2);
+ BN_with_flags(p, pinfo->r, BN_FLG_CONSTTIME);
+ if (!BN_mod_inverse(pinfo->t, pinfo->pp, p, ctx)) {
+ BN_free(p);
+ goto err;
+ }
+ }
+
+ /* We MUST free p before any further use of rsa->p */
+ BN_free(p);
+ }
+
+ ok = 1;
+ err:
+ if (ok == -1) {
+ RSAerr(0, ERR_LIB_BN);
+ ok = 0;
+ }
+ BN_CTX_end(ctx);
+ BN_CTX_free(ctx);
+ return ok;
+}
+#endif /* FIPS_MODULE */
+
+static int rsa_keygen(OPENSSL_CTX *libctx, RSA *rsa, int bits, int primes,
+ BIGNUM *e_value, BN_GENCB *cb, int pairwise_test)
+{
+ int ok = 0;
+
+ /*
+ * Only multi-prime keys or insecure keys with a small key length will use
+ * the older rsa_multiprime_keygen().
+ */
+ if (primes == 2 && bits >= 2048)
+ ok = rsa_sp800_56b_generate_key(rsa, bits, e_value, cb);
+#ifndef FIPS_MODULE
+ else
+ ok = rsa_multiprime_keygen(rsa, bits, primes, e_value, cb);
+#endif /* FIPS_MODULE */
+
+#ifdef FIPS_MODULE
+ pairwise_test = 1; /* FIPS MODE needs to always run the pairwise test */
#endif
-
- ok=1;
+ if (pairwise_test && ok > 0) {
+ OSSL_CALLBACK *stcb = NULL;
+ void *stcbarg = NULL;
+
+ OSSL_SELF_TEST_get_callback(libctx, &stcb, &stcbarg);
+ ok = rsa_keygen_pairwise_test(rsa, stcb, stcbarg);
+ if (!ok) {
+ /* Clear intermediate results */
+ BN_clear_free(rsa->d);
+ BN_clear_free(rsa->p);
+ BN_clear_free(rsa->q);
+ BN_clear_free(rsa->dmp1);
+ BN_clear_free(rsa->dmq1);
+ BN_clear_free(rsa->iqmp);
+ }
+ }
+ return ok;
+}
+
+/*
+ * For RSA key generation it is not known whether the key pair will be used
+ * for key transport or signatures. FIPS 140-2 IG 9.9 states that in this case
+ * either a signature verification OR an encryption operation may be used to
+ * perform the pairwise consistency check. The simpler encrypt/decrypt operation
+ * has been chosen for this case.
+ */
+static int rsa_keygen_pairwise_test(RSA *rsa, OSSL_CALLBACK *cb, void *cbarg)
+{
+ int ret = 0;
+ unsigned int ciphertxt_len;
+ unsigned char *ciphertxt = NULL;
+ const unsigned char plaintxt[16] = {0};
+ unsigned char decoded[256];
+ unsigned int decoded_len;
+ unsigned int plaintxt_len = (unsigned int)sizeof(plaintxt_len);
+ int padding = RSA_PKCS1_PADDING;
+ OSSL_SELF_TEST *st = NULL;
+
+ st = OSSL_SELF_TEST_new(cb, cbarg);
+ if (st == NULL)
+ goto err;
+ OSSL_SELF_TEST_onbegin(st, OSSL_SELF_TEST_TYPE_PCT,
+ OSSL_SELF_TEST_DESC_PCT_RSA_PKCS1);
+
+ ciphertxt_len = RSA_size(rsa);
+ ciphertxt = OPENSSL_zalloc(ciphertxt_len);
+ if (ciphertxt == NULL)
+ goto err;
+
+ ciphertxt_len = RSA_public_encrypt(plaintxt_len, plaintxt, ciphertxt, rsa,
+ padding);
+ if (ciphertxt_len <= 0)
+ goto err;
+ if (ciphertxt_len == plaintxt_len
+ && memcmp(ciphertxt, plaintxt, plaintxt_len) == 0)
+ goto err;
+
+ OSSL_SELF_TEST_oncorrupt_byte(st, ciphertxt);
+
+ decoded_len = RSA_private_decrypt(ciphertxt_len, ciphertxt, decoded, rsa,
+ padding);
+ if (decoded_len != plaintxt_len
+ || memcmp(decoded, plaintxt, decoded_len) != 0)
+ goto err;
+
+ ret = 1;
err:
- if (ok == -1)
- {
- RSAerr(RSA_F_RSA_BUILTIN_KEYGEN,ERR_LIB_BN);
- ok=0;
- }
- if (ctx != NULL)
- {
- BN_CTX_end(ctx);
- BN_CTX_free(ctx);
- }
-
- return ok;
- }
+ OSSL_SELF_TEST_onend(st, ret);
+ OSSL_SELF_TEST_free(st);
+ OPENSSL_free(ciphertxt);
+ return ret;
+}
projects / openssl.git / blobdiff