1 files changed, 357 insertions, 0 deletions
diff --git a/openssl/crypto/srp/srp_lib.c b/openssl/crypto/srp/srp_lib.c
new file mode 100644
index 000000000..92cea98dc
--- /dev/null
+++ b/openssl/crypto/srp/srp_lib.c
@@ -0,0 +1,357 @@
+/* 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)
+#define bn_pack4(a1,a2,a3,a4) 0x##a1##a2##a3##a4##ul
+#endif
+#if (BN_BYTES == 4)
+#define bn_pack4(a1,a2,a3,a4)  0x##a3##a4##ul, 0x##a1##a2##ul
+#endif
+#if (BN_BYTES == 2)
+#define bn_pack4(a1,a2,a3,a4) 0x##a4##u,0x##a3##u,0x##a2##u,0x##a1##u
+#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 ((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;
+
+	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