-/* crypto/srp/srp_lib.c */
/*
- * Written by Christophe Renou (christophe.renou@edelweb.fr) with the
- * precious help of Peter Sylvester (peter.sylvester@edelweb.fr) for the
- * EdelKey project and contributed to the OpenSSL project 2004.
- */
-/* ====================================================================
- * Copyright (c) 2004 The OpenSSL Project. All rights reserved.
- *
- * 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 above 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 acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
- *
- * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
- * endorse or promote products derived from this software without
- * prior written permission. For written permission, please contact
- * licensing@OpenSSL.org.
- *
- * 5. Products derived from this software may not be called "OpenSSL"
- * nor may "OpenSSL" appear in their names without prior written
- * permission of the OpenSSL Project.
- *
- * 6. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
- *
- * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
- * EXPRESSED 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 OpenSSL PROJECT OR
- * ITS 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.
- * ====================================================================
+ * Copyright 2004-2018 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright (c) 2004, EdelKey Project. All Rights Reserved.
*
- * This product includes cryptographic software written by Eric Young
- * (eay@cryptsoft.com). This product includes software written by Tim
- * Hudson (tjh@cryptsoft.com).
+ * 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
*
+ * Originally written by Christophe Renou and Peter Sylvester,
+ * for the EdelKey project.
*/
+
#ifndef OPENSSL_NO_SRP
-# include "cryptlib.h"
-# include "srp_lcl.h"
+# include "internal/cryptlib.h"
+# include <openssl/sha.h>
# include <openssl/srp.h>
# include <openssl/evp.h>
-# include "internal/bn_srp.h"
+# include "crypto/bn_srp.h"
-static BIGNUM *srp_Calc_k(BIGNUM *N, BIGNUM *g)
-{
- /* k = SHA1(N | PAD(g)) -- tls-srp draft 8 */
+/* calculate = SHA1(PAD(x) || PAD(y)) */
+static BIGNUM *srp_Calc_xy(const BIGNUM *x, const BIGNUM *y, const BIGNUM *N,
+ OPENSSL_CTX *libctx, const char *propq)
+{
unsigned char digest[SHA_DIGEST_LENGTH];
- unsigned char *tmp;
- EVP_MD_CTX ctxt;
- int longg;
- int longN = BN_num_bytes(N);
-
- if (BN_ucmp(g, N) >= 0)
- return NULL;
+ unsigned char *tmp = NULL;
+ int numN = BN_num_bytes(N);
+ BIGNUM *res = NULL;
+ EVP_MD *sha1 = EVP_MD_fetch(libctx, "SHA1", propq);
- if ((tmp = OPENSSL_malloc(longN)) == NULL)
+ if (sha1 == NULL)
return NULL;
- BN_bn2bin(N, tmp);
-
- EVP_MD_CTX_init(&ctxt);
- EVP_DigestInit_ex(&ctxt, EVP_sha1(), NULL);
- EVP_DigestUpdate(&ctxt, tmp, longN);
- memset(tmp, 0, longN);
- longg = BN_bn2bin(g, tmp);
- /* use the zeros behind to pad on left */
- EVP_DigestUpdate(&ctxt, tmp + longg, longN - longg);
- EVP_DigestUpdate(&ctxt, tmp, longg);
+ if (x != N && BN_ucmp(x, N) >= 0)
+ goto err;
+ if (y != N && BN_ucmp(y, N) >= 0)
+ goto err;
+ if ((tmp = OPENSSL_malloc(numN * 2)) == NULL)
+ goto err;
+ if (BN_bn2binpad(x, tmp, numN) < 0
+ || BN_bn2binpad(y, tmp + numN, numN) < 0
+ || !EVP_Digest(tmp, numN * 2, digest, NULL, sha1, NULL))
+ goto err;
+ res = BN_bin2bn(digest, sizeof(digest), NULL);
+ err:
+ EVP_MD_free(sha1);
OPENSSL_free(tmp);
-
- EVP_DigestFinal_ex(&ctxt, digest, NULL);
- EVP_MD_CTX_cleanup(&ctxt);
- return BN_bin2bn(digest, sizeof(digest), NULL);
+ return res;
}
-BIGNUM *SRP_Calc_u(BIGNUM *A, BIGNUM *B, BIGNUM *N)
+static BIGNUM *srp_Calc_k(const BIGNUM *N, const BIGNUM *g, OPENSSL_CTX *libctx,
+ const char *propq)
{
- /* k = SHA1(PAD(A) || PAD(B) ) -- tls-srp draft 8 */
-
- BIGNUM *u;
- unsigned char cu[SHA_DIGEST_LENGTH];
- unsigned char *cAB;
- EVP_MD_CTX ctxt;
- int longN;
- if ((A == NULL) || (B == NULL) || (N == NULL))
- return NULL;
-
- if (BN_ucmp(A, N) >= 0 || BN_ucmp(B, N) >= 0)
- return NULL;
-
- longN = BN_num_bytes(N);
-
- if ((cAB = OPENSSL_malloc(2 * longN)) == NULL)
- return NULL;
-
- memset(cAB, 0, longN);
+ /* k = SHA1(N | PAD(g)) -- tls-srp RFC 5054 */
+ return srp_Calc_xy(N, g, N, libctx, propq);
+}
- EVP_MD_CTX_init(&ctxt);
- EVP_DigestInit_ex(&ctxt, EVP_sha1(), NULL);
- EVP_DigestUpdate(&ctxt, cAB + BN_bn2bin(A, cAB + longN), longN);
- EVP_DigestUpdate(&ctxt, cAB + BN_bn2bin(B, cAB + longN), longN);
- OPENSSL_free(cAB);
- EVP_DigestFinal_ex(&ctxt, cu, NULL);
- EVP_MD_CTX_cleanup(&ctxt);
+BIGNUM *SRP_Calc_u_ex(const BIGNUM *A, const BIGNUM *B, const BIGNUM *N,
+ OPENSSL_CTX *libctx, const char *propq)
+{
+ /* u = SHA1(PAD(A) || PAD(B) ) -- tls-srp RFC 5054 */
+ return srp_Calc_xy(A, B, N, libctx, propq);
+}
- if (!(u = BN_bin2bn(cu, sizeof(cu), NULL)))
- return NULL;
- if (!BN_is_zero(u))
- return u;
- BN_free(u);
- return NULL;
+BIGNUM *SRP_Calc_u(const BIGNUM *A, const BIGNUM *B, const BIGNUM *N)
+{
+ /* u = SHA1(PAD(A) || PAD(B) ) -- tls-srp RFC 5054 */
+ return srp_Calc_xy(A, B, N, NULL, NULL);
}
-BIGNUM *SRP_Calc_server_key(BIGNUM *A, BIGNUM *v, BIGNUM *u, BIGNUM *b,
- BIGNUM *N)
+BIGNUM *SRP_Calc_server_key(const BIGNUM *A, const BIGNUM *v, const BIGNUM *u,
+ const BIGNUM *b, const BIGNUM *N)
{
BIGNUM *tmp = NULL, *S = NULL;
BN_CTX *bn_ctx;
if (u == NULL || A == NULL || v == NULL || b == NULL || N == NULL)
return NULL;
- if ((bn_ctx = BN_CTX_new()) == NULL ||
- (tmp = BN_new()) == NULL || (S = BN_new()) == NULL)
+ if ((bn_ctx = BN_CTX_new()) == NULL || (tmp = BN_new()) == NULL)
goto err;
/* S = (A*v**u) ** b */
goto err;
if (!BN_mod_mul(tmp, A, tmp, N, bn_ctx))
goto err;
- if (!BN_mod_exp(S, tmp, b, N, bn_ctx))
- goto err;
+
+ S = BN_new();
+ if (S != NULL && !BN_mod_exp(S, tmp, b, N, bn_ctx)) {
+ BN_free(S);
+ S = NULL;
+ }
err:
BN_CTX_free(bn_ctx);
BN_clear_free(tmp);
return S;
}
-BIGNUM *SRP_Calc_B(BIGNUM *b, BIGNUM *N, BIGNUM *g, BIGNUM *v)
+BIGNUM *SRP_Calc_B_ex(const BIGNUM *b, const BIGNUM *N, const BIGNUM *g,
+ const BIGNUM *v, OPENSSL_CTX *libctx, const char *propq)
{
BIGNUM *kv = NULL, *gb = NULL;
BIGNUM *B = NULL, *k = NULL;
BN_CTX *bn_ctx;
if (b == NULL || N == NULL || g == NULL || v == NULL ||
- (bn_ctx = BN_CTX_new()) == NULL)
+ (bn_ctx = BN_CTX_new_ex(libctx)) == NULL)
return NULL;
if ((kv = BN_new()) == NULL ||
/* B = g**b + k*v */
- if (!BN_mod_exp(gb, g, b, N, bn_ctx) ||
- !(k = srp_Calc_k(N, g)) ||
- !BN_mod_mul(kv, v, k, N, bn_ctx) ||
- !BN_mod_add(B, gb, kv, N, bn_ctx)) {
+ if (!BN_mod_exp(gb, g, b, N, bn_ctx)
+ || (k = srp_Calc_k(N, g, libctx, propq)) == NULL
+ || !BN_mod_mul(kv, v, k, N, bn_ctx)
+ || !BN_mod_add(B, gb, kv, N, bn_ctx)) {
BN_free(B);
B = NULL;
}
return B;
}
-BIGNUM *SRP_Calc_x(BIGNUM *s, const char *user, const char *pass)
+BIGNUM *SRP_Calc_B(const BIGNUM *b, const BIGNUM *N, const BIGNUM *g,
+ const BIGNUM *v)
+{
+ return SRP_Calc_B_ex(b, N, g, v, NULL, NULL);
+}
+
+BIGNUM *SRP_Calc_x_ex(const BIGNUM *s, const char *user, const char *pass,
+ OPENSSL_CTX *libctx, const char *propq)
{
unsigned char dig[SHA_DIGEST_LENGTH];
- EVP_MD_CTX ctxt;
- unsigned char *cs;
+ EVP_MD_CTX *ctxt;
+ unsigned char *cs = NULL;
+ BIGNUM *res = NULL;
+ EVP_MD *sha1 = NULL;
if ((s == NULL) || (user == NULL) || (pass == NULL))
return NULL;
- if ((cs = OPENSSL_malloc(BN_num_bytes(s))) == NULL)
+ ctxt = EVP_MD_CTX_new();
+ if (ctxt == NULL)
return NULL;
+ if ((cs = OPENSSL_malloc(BN_num_bytes(s))) == NULL)
+ goto err;
+
+ sha1 = EVP_MD_fetch(libctx, "SHA1", propq);
+ if (sha1 == NULL)
+ goto err;
+
+ if (!EVP_DigestInit_ex(ctxt, sha1, NULL)
+ || !EVP_DigestUpdate(ctxt, user, strlen(user))
+ || !EVP_DigestUpdate(ctxt, ":", 1)
+ || !EVP_DigestUpdate(ctxt, pass, strlen(pass))
+ || !EVP_DigestFinal_ex(ctxt, dig, NULL)
+ || !EVP_DigestInit_ex(ctxt, sha1, NULL))
+ goto err;
+ if (BN_bn2bin(s, cs) < 0)
+ goto err;
+ if (!EVP_DigestUpdate(ctxt, cs, BN_num_bytes(s)))
+ goto err;
- EVP_MD_CTX_init(&ctxt);
- EVP_DigestInit_ex(&ctxt, EVP_sha1(), NULL);
- EVP_DigestUpdate(&ctxt, user, strlen(user));
- EVP_DigestUpdate(&ctxt, ":", 1);
- EVP_DigestUpdate(&ctxt, pass, strlen(pass));
- EVP_DigestFinal_ex(&ctxt, dig, NULL);
+ if (!EVP_DigestUpdate(ctxt, dig, sizeof(dig))
+ || !EVP_DigestFinal_ex(ctxt, dig, NULL))
+ goto err;
+
+ res = BN_bin2bn(dig, sizeof(dig), NULL);
- EVP_DigestInit_ex(&ctxt, EVP_sha1(), NULL);
- BN_bn2bin(s, cs);
- EVP_DigestUpdate(&ctxt, cs, BN_num_bytes(s));
+ err:
+ EVP_MD_free(sha1);
OPENSSL_free(cs);
- EVP_DigestUpdate(&ctxt, dig, sizeof(dig));
- EVP_DigestFinal_ex(&ctxt, dig, NULL);
- EVP_MD_CTX_cleanup(&ctxt);
+ EVP_MD_CTX_free(ctxt);
+ return res;
+}
- return BN_bin2bn(dig, sizeof(dig), NULL);
+BIGNUM *SRP_Calc_x(const BIGNUM *s, const char *user, const char *pass)
+{
+ return SRP_Calc_x_ex(s, user, pass, NULL, NULL);
}
-BIGNUM *SRP_Calc_A(BIGNUM *a, BIGNUM *N, BIGNUM *g)
+BIGNUM *SRP_Calc_A(const BIGNUM *a, const BIGNUM *N, const BIGNUM *g)
{
BN_CTX *bn_ctx;
BIGNUM *A = NULL;
- if (a == NULL || N == NULL || g == NULL ||
- (bn_ctx = BN_CTX_new()) == NULL)
+ if (a == NULL || N == NULL || g == NULL || (bn_ctx = BN_CTX_new()) == NULL)
return NULL;
if ((A = BN_new()) != NULL && !BN_mod_exp(A, g, a, N, bn_ctx)) {
return A;
}
-BIGNUM *SRP_Calc_client_key(BIGNUM *N, BIGNUM *B, BIGNUM *g, BIGNUM *x,
- BIGNUM *a, BIGNUM *u)
+BIGNUM *SRP_Calc_client_key_ex(const BIGNUM *N, const BIGNUM *B, const BIGNUM *g,
+ const BIGNUM *x, const BIGNUM *a, const BIGNUM *u,
+ OPENSSL_CTX *libctx, const char *propq)
{
BIGNUM *tmp = NULL, *tmp2 = NULL, *tmp3 = NULL, *k = NULL, *K = NULL;
BN_CTX *bn_ctx;
if (u == NULL || B == NULL || N == NULL || g == NULL || x == NULL
- || a == NULL || (bn_ctx = BN_CTX_new()) == NULL)
+ || a == NULL || (bn_ctx = BN_CTX_new_ex(libctx)) == NULL)
return NULL;
if ((tmp = BN_new()) == NULL ||
(tmp2 = BN_new()) == NULL ||
- (tmp3 = BN_new()) == NULL || (K = BN_new()) == NULL)
+ (tmp3 = BN_new()) == NULL)
goto err;
if (!BN_mod_exp(tmp, g, x, N, bn_ctx))
goto err;
- if (!(k = srp_Calc_k(N, g)))
+ if ((k = srp_Calc_k(N, g, libctx, propq)) == NULL)
goto err;
if (!BN_mod_mul(tmp2, tmp, k, N, bn_ctx))
goto err;
if (!BN_mod_sub(tmp, B, tmp2, N, bn_ctx))
goto err;
-
- if (!BN_mod_mul(tmp3, u, x, N, bn_ctx))
- goto err;
- if (!BN_mod_add(tmp2, a, tmp3, N, bn_ctx))
+ if (!BN_mul(tmp3, u, x, bn_ctx))
goto err;
- if (!BN_mod_exp(K, tmp, tmp2, N, bn_ctx))
+ if (!BN_add(tmp2, a, tmp3))
goto err;
+ K = BN_new();
+ if (K != NULL && !BN_mod_exp(K, tmp, tmp2, N, bn_ctx)) {
+ BN_free(K);
+ K = NULL;
+ }
err:
BN_CTX_free(bn_ctx);
return K;
}
-int SRP_Verify_B_mod_N(BIGNUM *B, BIGNUM *N)
+BIGNUM *SRP_Calc_client_key(const BIGNUM *N, const BIGNUM *B, const BIGNUM *g,
+ const BIGNUM *x, const BIGNUM *a, const BIGNUM *u)
+{
+ return SRP_Calc_client_key_ex(N, B, g, x, a, u, NULL, NULL);
+}
+
+int SRP_Verify_B_mod_N(const BIGNUM *B, const BIGNUM *N)
{
BIGNUM *r;
BN_CTX *bn_ctx;
return ret;
}
-int SRP_Verify_A_mod_N(BIGNUM *A, BIGNUM *N)
+int SRP_Verify_A_mod_N(const BIGNUM *A, const BIGNUM *N)
{
/* Checks if A % N == 0 */
return SRP_Verify_B_mod_N(A, N);
}
+static SRP_gN knowngN[] = {
+ {"8192", &bn_generator_19, &bn_group_8192},
+ {"6144", &bn_generator_5, &bn_group_6144},
+ {"4096", &bn_generator_5, &bn_group_4096},
+ {"3072", &bn_generator_5, &bn_group_3072},
+ {"2048", &bn_generator_2, &bn_group_2048},
+ {"1536", &bn_generator_2, &bn_group_1536},
+ {"1024", &bn_generator_2, &bn_group_1024},
+};
+
+# define KNOWN_GN_NUMBER sizeof(knowngN) / sizeof(SRP_gN)
+
/*
- * Check if G and N are kwown parameters. The values have been generated
- * from the ietf-tls-srp draft version 8
+ * Check if G and N are known parameters. The values have been generated
+ * from the IETF RFC 5054
*/
-char *SRP_check_known_gN_param(BIGNUM *g, BIGNUM *N)
+char *SRP_check_known_gN_param(const BIGNUM *g, const BIGNUM *N)
{
size_t i;
if ((g == NULL) || (N == NULL))
- return 0;
-
- srp_bn_print(g);
- srp_bn_print(N);
+ return NULL;
for (i = 0; i < KNOWN_GN_NUMBER; i++) {
if (BN_cmp(knowngN[i].g, g) == 0 && BN_cmp(knowngN[i].N, N) == 0)
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