--- /dev/null
+/* 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.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com). This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+#ifndef OPENSSL_NO_SRP
+#include "cryptlib.h"
+#include "srp_lcl.h"
+#include <openssl/srp.h>
+#include <openssl/evp.h>
+
+#if (BN_BYTES == 8)
+# if (defined(_WIN32) || defined(_WIN64)) && !defined(__MINGW32__)
+# define bn_pack4(a1,a2,a3,a4) ((a1##UI64<<48)|(a2##UI64<<32)|(a3##UI64<<16)|a4##UI64)
+# elif defined(__arch64__)
+# define bn_pack4(a1,a2,a3,a4) ((a1##UL<<48)|(a2##UL<<32)|(a3##UL<<16)|a4##UL)
+# else
+# define bn_pack4(a1,a2,a3,a4) ((a1##ULL<<48)|(a2##ULL<<32)|(a3##ULL<<16)|a4##ULL)
+# endif
+#elif (BN_BYTES == 4)
+# define bn_pack4(a1,a2,a3,a4) ((a3##UL<<16)|a4##UL), ((a1##UL<<16)|a2##UL)
+#else
+# error "unsupported BN_BYTES"
+#endif
+
+
+#include "srp_grps.h"
+
+static BIGNUM *srp_Calc_k(BIGNUM *N, BIGNUM *g)
+ {
+ /* k = SHA1(N | PAD(g)) -- tls-srp draft 8 */
+
+ 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;
+
+ if ((tmp = OPENSSL_malloc(longN)) == 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);
+ OPENSSL_free(tmp);
+
+ EVP_DigestFinal_ex(&ctxt, digest, NULL);
+ EVP_MD_CTX_cleanup(&ctxt);
+ return BN_bin2bn(digest, sizeof(digest), NULL);
+ }
+
+BIGNUM *SRP_Calc_u(BIGNUM *A, BIGNUM *B, BIGNUM *N)
+ {
+ /* 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);
+
+ 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);
+
+ 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_server_key(BIGNUM *A, BIGNUM *v, BIGNUM *u, BIGNUM *b, 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 )
+ goto err;
+
+ /* S = (A*v**u) ** b */
+
+ if (!BN_mod_exp(tmp,v,u,N,bn_ctx))
+ 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;
+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 *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)
+ return NULL;
+
+ if ( (kv = BN_new()) == NULL ||
+ (gb = BN_new()) == NULL ||
+ (B = BN_new())== NULL)
+ goto err;
+
+ /* 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))
+ {
+ BN_free(B);
+ B = NULL;
+ }
+err:
+ BN_CTX_free(bn_ctx);
+ BN_clear_free(kv);
+ BN_clear_free(gb);
+ BN_free(k);
+ return B;
+ }
+
+BIGNUM *SRP_Calc_x(BIGNUM *s, const char *user, const char *pass)
+ {
+ unsigned char dig[SHA_DIGEST_LENGTH];
+ EVP_MD_CTX ctxt;
+ unsigned char *cs;
+
+ if ((s == NULL) ||
+ (user == NULL) ||
+ (pass == NULL))
+ return NULL;
+
+ if ((cs = OPENSSL_malloc(BN_num_bytes(s))) == NULL)
+ return NULL;
+
+ 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);
+
+ EVP_DigestInit_ex(&ctxt, EVP_sha1(), NULL);
+ BN_bn2bin(s,cs);
+ EVP_DigestUpdate(&ctxt, cs, BN_num_bytes(s));
+ OPENSSL_free(cs);
+ EVP_DigestUpdate(&ctxt, dig, sizeof(dig));
+ EVP_DigestFinal_ex(&ctxt, dig, NULL);
+ EVP_MD_CTX_cleanup(&ctxt);
+
+ return BN_bin2bn(dig, sizeof(dig), NULL);
+ }
+
+BIGNUM *SRP_Calc_A(BIGNUM *a, BIGNUM *N, BIGNUM *g)
+ {
+ BN_CTX *bn_ctx;
+ BIGNUM * A = 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))
+ {
+ BN_free(A);
+ A = NULL;
+ }
+ BN_CTX_free(bn_ctx);
+ return A;
+ }
+
+
+BIGNUM *SRP_Calc_client_key(BIGNUM *N, BIGNUM *B, BIGNUM *g, BIGNUM *x, BIGNUM *a, BIGNUM *u)
+ {
+ 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)
+ return NULL;
+
+ if ((tmp = BN_new()) == NULL ||
+ (tmp2 = BN_new())== NULL ||
+ (tmp3 = BN_new())== NULL ||
+ (K = BN_new()) == NULL)
+ goto err;
+
+ if (!BN_mod_exp(tmp,g,x,N,bn_ctx))
+ goto err;
+ if (!(k = srp_Calc_k(N,g)))
+ 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))
+ goto err;
+ if (!BN_mod_exp(K,tmp,tmp2,N,bn_ctx))
+ goto err;
+
+err :
+ BN_CTX_free(bn_ctx);
+ BN_clear_free(tmp);
+ BN_clear_free(tmp2);
+ BN_clear_free(tmp3);
+ BN_free(k);
+ return K;
+ }
+
+int SRP_Verify_B_mod_N(BIGNUM *B, BIGNUM *N)
+ {
+ BIGNUM *r;
+ BN_CTX *bn_ctx;
+ int ret = 0;
+
+ if (B == NULL || N == NULL ||
+ (bn_ctx = BN_CTX_new()) == NULL)
+ return 0;
+
+ if ((r = BN_new()) == NULL)
+ goto err;
+ /* Checks if B % N == 0 */
+ if (!BN_nnmod(r,B,N,bn_ctx))
+ goto err;
+ ret = !BN_is_zero(r);
+err:
+ BN_CTX_free(bn_ctx);
+ BN_free(r);
+ return ret;
+ }
+
+int SRP_Verify_A_mod_N(BIGNUM *A, BIGNUM *N)
+ {
+ /* Checks if A % N == 0 */
+ return SRP_Verify_B_mod_N(A,N) ;
+ }
+
+
+/* Check if G and N are kwown parameters.
+ The values have been generated from the ietf-tls-srp draft version 8
+*/
+char *SRP_check_known_gN_param(BIGNUM *g, BIGNUM *N)
+ {
+ size_t i;
+ if ((g == NULL) || (N == NULL))
+ return 0;
+
+ srp_bn_print(g);
+ srp_bn_print(N);
+
+ for(i = 0; i < KNOWN_GN_NUMBER; i++)
+ {
+ if (BN_cmp(knowngN[i].g, g) == 0 && BN_cmp(knowngN[i].N, N) == 0)
+ return knowngN[i].id;
+ }
+ return NULL;
+ }
+
+SRP_gN *SRP_get_default_gN(const char *id)
+ {
+ size_t i;
+
+ if (id == NULL)
+ return knowngN;
+ for(i = 0; i < KNOWN_GN_NUMBER; i++)
+ {
+ if (strcmp(knowngN[i].id, id)==0)
+ return knowngN + i;
+ }
+ return NULL;
+ }
+#endif
projects / cassiopeia.git / blobdiff