From: Guus Sliepen <guus@tinc-vpn.org>
Date: Sun, 15 Sep 2013 14:22:34 +0000 (+0200)
Subject: Add the brainpoolp512r1 curve and use it.
X-Git-Url: https://git.tinc-vpn.org/git/browse?a=commitdiff_plain;h=a7458f6dfd86dd345b43690ef977dc034f550e68;p=tinc

Add the brainpoolp512r1 curve and use it.
---

diff --git a/src/ecdh.h b/src/ecdh.h
index fbd47292..95d3812e 100644
--- a/src/ecdh.h
+++ b/src/ecdh.h
@@ -20,8 +20,8 @@
 #ifndef __TINC_ECDH_H__
 #define __TINC_ECDH_H__
 
-#define ECDH_SIZE 67
-#define ECDH_SHARED_SIZE 66
+#define ECDH_SIZE 65
+#define ECDH_SHARED_SIZE 64
 
 #ifndef __TINC_ECDH_INTERNAL__
 typedef struct ecdh ecdh_t;
diff --git a/src/openssl/crypto.c b/src/openssl/crypto.c
index 6c5cbc88..e07c818a 100644
--- a/src/openssl/crypto.c
+++ b/src/openssl/crypto.c
@@ -25,6 +25,63 @@
 
 #include "../crypto.h"
 
+#include "brainpool.h"
+
+EC_GROUP *brainpoolp512r1;
+
+static void generate_brainpool_curve() {
+	static const char *p = "AADD9DB8DBE9C48B3FD4E6AE33C9FC07CB308DB3B3C9D20ED6639CCA703308717D4D9B009BC66842AECDA12AE6A380E62881FF2F2D82C68528AA6056583A48F3";
+	static const char *A = "7830A3318B603B89E2327145AC234CC594CBDD8D3DF91610A83441CAEA9863BC2DED5D5AA8253AA10A2EF1C98B9AC8B57F1117A72BF2C7B9E7C1AC4D77FC94CA";
+	static const char *B = "3DF91610A83441CAEA9863BC2DED5D5AA8253AA10A2EF1C98B9AC8B57F1117A72BF2C7B9E7C1AC4D77FC94CADC083E67984050B75EBAE5DD2809BD638016F723";
+	static const char *x = "81AEE4BDD82ED9645A21322E9C4C6A9385ED9F70B5D916C1B43B62EEF4D0098EFF3B1F78E2D0D48D50D1687B93B97D5F7C6D5047406A5E688B352209BCB9F822";
+	static const char *y = "7DDE385D566332ECC0EABFA9CF7822FDF209F70024A57B1AA000C55B881F8111B2DCDE494A5F485E5BCA4BD88A2763AED1CA2B2FA8F0540678CD1E0F3AD80892";
+	static const char *q = "AADD9DB8DBE9C48B3FD4E6AE33C9FC07CB308DB3B3C9D20ED6639CCA70330870553E5C414CA92619418661197FAC10471DB1D381085DDADDB58796829CA90069";
+
+	BIGNUM *bn_p = NULL;
+	BIGNUM *bn_A = NULL;
+	BIGNUM *bn_B = NULL;
+	BIGNUM *bn_x = NULL;
+	BIGNUM *bn_y = NULL;
+	BIGNUM *bn_q = NULL;
+
+	BN_hex2bn(&bn_p, p);
+	BN_hex2bn(&bn_A, A);
+	BN_hex2bn(&bn_B, B);
+	BN_hex2bn(&bn_x, x);
+	BN_hex2bn(&bn_y, y);
+	BN_hex2bn(&bn_q, q);
+
+	BN_CTX *ctx = BN_CTX_new();
+
+	if(!bn_p || !bn_A || !bn_B || !bn_x || !bn_y || !bn_q || !ctx)
+		abort();
+
+	brainpoolp512r1 = EC_GROUP_new_curve_GFp(bn_p, bn_A, bn_B, ctx);
+
+	if(!brainpoolp512r1)
+		abort();
+
+	EC_POINT *generator = EC_POINT_new(brainpoolp512r1);
+
+	if(!generator)
+		abort();
+
+	if(EC_POINT_set_affine_coordinates_GFp(brainpoolp512r1, generator, bn_x, bn_y, ctx) != 1)
+		abort();
+
+	if(EC_GROUP_set_generator(brainpoolp512r1, generator, bn_q, NULL) != 1)
+		abort();
+
+	EC_POINT_free(generator);
+	BN_CTX_free(ctx);
+	BN_free(bn_p);
+	BN_free(bn_A);
+	BN_free(bn_B);
+	BN_free(bn_x);
+	BN_free(bn_y);
+	BN_free(bn_q);
+}
+
 void crypto_init(void) {
 	RAND_load_file("/dev/urandom", 1024);
 
@@ -38,6 +95,8 @@ void crypto_init(void) {
 		fprintf(stderr, "Not enough entropy for the PRNG!\n");
 		abort();
 	}
+
+	generate_brainpool_curve();
 }
 
 void crypto_exit(void) {
diff --git a/src/openssl/ecdh.c b/src/openssl/ecdh.c
index d997007f..fde8e8a4 100644
--- a/src/openssl/ecdh.c
+++ b/src/openssl/ecdh.c
@@ -32,14 +32,16 @@ typedef EC_KEY ecdh_t;
 #include "../utils.h"
 #include "../xalloc.h"
 
+#include "brainpool.h"
+
 ecdh_t *ecdh_generate_public(void *pubkey) {
-	ecdh_t *ecdh = EC_KEY_new_by_curve_name(NID_secp521r1);
+	ecdh_t *ecdh = EC_KEY_new();
 	if(!ecdh) {
-		logger(DEBUG_ALWAYS, LOG_ERR, "Generating EC key_by_curve_name failed: %s", ERR_error_string(ERR_get_error(), NULL));
+		logger(DEBUG_ALWAYS, LOG_ERR, "Allocating EC key failed: %s", ERR_error_string(ERR_get_error(), NULL));
 		return false;
 	}
 
-	if(!EC_KEY_generate_key(ecdh)) {
+	if(!EC_KEY_set_group(ecdh, brainpoolp512r1) || !EC_KEY_generate_key(ecdh)) {
 		EC_KEY_free(ecdh);
 		logger(DEBUG_ALWAYS, LOG_ERR, "Generating EC key failed: %s", ERR_error_string(ERR_get_error(), NULL));
 		return NULL;
diff --git a/src/openssl/ecdsa.c b/src/openssl/ecdsa.c
index bca89fc5..02adeb62 100644
--- a/src/openssl/ecdsa.c
+++ b/src/openssl/ecdsa.c
@@ -30,15 +30,19 @@ typedef EC_KEY ecdsa_t;
 #include "../utils.h"
 #include "../xalloc.h"
 
+#include "brainpool.h"
+
 // Get and set ECDSA keys
 //
 ecdsa_t *ecdsa_set_base64_public_key(const char *p) {
-	ecdsa_t *ecdsa = EC_KEY_new_by_curve_name(NID_secp521r1);
+	ecdsa_t *ecdsa = EC_KEY_new();
 	if(!ecdsa) {
-		logger(DEBUG_ALWAYS, LOG_DEBUG, "EC_KEY_new_by_curve_name failed: %s", ERR_error_string(ERR_get_error(), NULL));
+		logger(DEBUG_ALWAYS, LOG_DEBUG, "Allocating EC key failed: %s", ERR_error_string(ERR_get_error(), NULL));
 		return NULL;
 	}
 
+	EC_KEY_set_group(ecdsa, brainpoolp512r1);
+
 	int len = strlen(p);
 	unsigned char pubkey[len / 4 * 3 + 3];
 	const unsigned char *ppubkey = pubkey;
diff --git a/src/openssl/ecdsagen.c b/src/openssl/ecdsagen.c
index 1affce05..e818ff11 100644
--- a/src/openssl/ecdsagen.c
+++ b/src/openssl/ecdsagen.c
@@ -30,18 +30,24 @@ typedef EC_KEY ecdsa_t;
 #include "../utils.h"
 #include "../xalloc.h"
 
+#include "brainpool.h"
+
 // Generate ECDSA key
 
 ecdsa_t *ecdsa_generate(void) {
-	ecdsa_t *ecdsa = EC_KEY_new_by_curve_name(NID_secp521r1);
+	ecdsa_t *ecdsa = EC_KEY_new();
+	if(!ecdsa) {
+		fprintf(stderr, "Allocating EC key failed: %s", ERR_error_string(ERR_get_error(), NULL));
+		return NULL;
+	}
 
-	if(!ecdsa || !EC_KEY_generate_key(ecdsa)) {
+	if(!EC_KEY_set_group(ecdsa, brainpoolp512r1) || !EC_KEY_generate_key(ecdsa)) {
 		fprintf(stderr, "Generating EC key failed: %s", ERR_error_string(ERR_get_error(), NULL));
 		ecdsa_free(ecdsa);
-		return false;
+		return NULL;
 	}
 
-	EC_KEY_set_asn1_flag(ecdsa, OPENSSL_EC_NAMED_CURVE);
+	EC_KEY_set_asn1_flag(ecdsa, 0);
 	EC_KEY_set_conv_form(ecdsa, POINT_CONVERSION_COMPRESSED);
 
 	return ecdsa;