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-rw-r--r--src/libzrtpcpp/crypto/openssl/ZrtpDH.cpp426
1 files changed, 426 insertions, 0 deletions
diff --git a/src/libzrtpcpp/crypto/openssl/ZrtpDH.cpp b/src/libzrtpcpp/crypto/openssl/ZrtpDH.cpp
new file mode 100644
index 0000000..fbd623c
--- /dev/null
+++ b/src/libzrtpcpp/crypto/openssl/ZrtpDH.cpp
@@ -0,0 +1,426 @@
+/*
+ Copyright (C) 2006, 2009 by Werner Dittmann
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL. If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so. If you
+ * do not wish to do so, delete this exception statement from your
+ * version. If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+
+/** Copyright (C) 2006, 2009
+ *
+ * @author Werner Dittmann <Werner.Dittmann@t-online.de>
+ */
+
+#include <string.h>
+
+#include <openssl/crypto.h>
+#include <openssl/bio.h>
+#include <openssl/bn.h>
+#include <openssl/rand.h>
+#include <openssl/err.h>
+#include <openssl/dh.h>
+#include <openssl/evp.h>
+#include <openssl/ec.h>
+#include <openssl/ecdh.h>
+
+#include <libzrtpcpp/crypto/ZrtpDH.h>
+#include <libzrtpcpp/ZrtpTextData.h>
+
+// extern void initializeOpenSSL();
+
+static BIGNUM* bnP2048 = NULL;
+static BIGNUM* bnP3072 = NULL;
+// static BIGNUM* bnP4096 = NULL;
+
+static BIGNUM* bnP2048MinusOne = NULL;
+static BIGNUM* bnP3072MinusOne = NULL;
+// static BIGNUM* bnP4096MinusOne = NULL;
+
+static uint8_t dhinit = 0;
+
+void randomZRTP(uint8_t *buf, int32_t length)
+{
+// initializeOpenSSL();
+ RAND_bytes(buf, length);
+}
+
+static const uint8_t P2048[] =
+{
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2,
+ 0x21, 0x68, 0xC2, 0x34, 0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1,
+ 0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74, 0x02, 0x0B, 0xBE, 0xA6,
+ 0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD,
+ 0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D,
+ 0xF2, 0x5F, 0x14, 0x37, 0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45,
+ 0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6, 0xF4, 0x4C, 0x42, 0xE9,
+ 0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED,
+ 0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11,
+ 0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE4, 0x5B, 0x3D,
+ 0xC2, 0x00, 0x7C, 0xB8, 0xA1, 0x63, 0xBF, 0x05, 0x98, 0xDA, 0x48, 0x36,
+ 0x1C, 0x55, 0xD3, 0x9A, 0x69, 0x16, 0x3F, 0xA8, 0xFD, 0x24, 0xCF, 0x5F,
+ 0x83, 0x65, 0x5D, 0x23, 0xDC, 0xA3, 0xAD, 0x96, 0x1C, 0x62, 0xF3, 0x56,
+ 0x20, 0x85, 0x52, 0xBB, 0x9E, 0xD5, 0x29, 0x07, 0x70, 0x96, 0x96, 0x6D,
+ 0x67, 0x0C, 0x35, 0x4E, 0x4A, 0xBC, 0x98, 0x04, 0xF1, 0x74, 0x6C, 0x08,
+ 0xCA, 0x18, 0x21, 0x7C, 0x32, 0x90, 0x5E, 0x46, 0x2E, 0x36, 0xCE, 0x3B,
+ 0xE3, 0x9E, 0x77, 0x2C, 0x18, 0x0E, 0x86, 0x03, 0x9B, 0x27, 0x83, 0xA2,
+ 0xEC, 0x07, 0xA2, 0x8F, 0xB5, 0xC5, 0x5D, 0xF0, 0x6F, 0x4C, 0x52, 0xC9,
+ 0xDE, 0x2B, 0xCB, 0xF6, 0x95, 0x58, 0x17, 0x18, 0x39, 0x95, 0x49, 0x7C,
+ 0xEA, 0x95, 0x6A, 0xE5, 0x15, 0xD2, 0x26, 0x18, 0x98, 0xFA, 0x05, 0x10,
+ 0x15, 0x72, 0x8E, 0x5A, 0x8A, 0xAC, 0xAA, 0x68, 0xFF, 0xFF, 0xFF, 0xFF,
+ 0xFF, 0xFF, 0xFF, 0xFF
+};
+
+static const uint8_t P3072[] =
+{
+ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2,
+ 0x21, 0x68, 0xC2, 0x34, 0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1,
+ 0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74, 0x02, 0x0B, 0xBE, 0xA6,
+ 0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD,
+ 0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D,
+ 0xF2, 0x5F, 0x14, 0x37, 0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45,
+ 0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6, 0xF4, 0x4C, 0x42, 0xE9,
+ 0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED,
+ 0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11,
+ 0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE4, 0x5B, 0x3D,
+ 0xC2, 0x00, 0x7C, 0xB8, 0xA1, 0x63, 0xBF, 0x05, 0x98, 0xDA, 0x48, 0x36,
+ 0x1C, 0x55, 0xD3, 0x9A, 0x69, 0x16, 0x3F, 0xA8, 0xFD, 0x24, 0xCF, 0x5F,
+ 0x83, 0x65, 0x5D, 0x23, 0xDC, 0xA3, 0xAD, 0x96, 0x1C, 0x62, 0xF3, 0x56,
+ 0x20, 0x85, 0x52, 0xBB, 0x9E, 0xD5, 0x29, 0x07, 0x70, 0x96, 0x96, 0x6D,
+ 0x67, 0x0C, 0x35, 0x4E, 0x4A, 0xBC, 0x98, 0x04, 0xF1, 0x74, 0x6C, 0x08,
+ 0xCA, 0x18, 0x21, 0x7C, 0x32, 0x90, 0x5E, 0x46, 0x2E, 0x36, 0xCE, 0x3B,
+ 0xE3, 0x9E, 0x77, 0x2C, 0x18, 0x0E, 0x86, 0x03, 0x9B, 0x27, 0x83, 0xA2,
+ 0xEC, 0x07, 0xA2, 0x8F, 0xB5, 0xC5, 0x5D, 0xF0, 0x6F, 0x4C, 0x52, 0xC9,
+ 0xDE, 0x2B, 0xCB, 0xF6, 0x95, 0x58, 0x17, 0x18, 0x39, 0x95, 0x49, 0x7C,
+ 0xEA, 0x95, 0x6A, 0xE5, 0x15, 0xD2, 0x26, 0x18, 0x98, 0xFA, 0x05, 0x10,
+ 0x15, 0x72, 0x8E, 0x5A, 0x8A, 0xAA, 0xC4, 0x2D, 0xAD, 0x33, 0x17, 0x0D,
+ 0x04, 0x50, 0x7A, 0x33, 0xA8, 0x55, 0x21, 0xAB, 0xDF, 0x1C, 0xBA, 0x64,
+ 0xEC, 0xFB, 0x85, 0x04, 0x58, 0xDB, 0xEF, 0x0A, 0x8A, 0xEA, 0x71, 0x57,
+ 0x5D, 0x06, 0x0C, 0x7D, 0xB3, 0x97, 0x0F, 0x85, 0xA6, 0xE1, 0xE4, 0xC7,
+ 0xAB, 0xF5, 0xAE, 0x8C, 0xDB, 0x09, 0x33, 0xD7, 0x1E, 0x8C, 0x94, 0xE0,
+ 0x4A, 0x25, 0x61, 0x9D, 0xCE, 0xE3, 0xD2, 0x26, 0x1A, 0xD2, 0xEE, 0x6B,
+ 0xF1, 0x2F, 0xFA, 0x06, 0xD9, 0x8A, 0x08, 0x64, 0xD8, 0x76, 0x02, 0x73,
+ 0x3E, 0xC8, 0x6A, 0x64, 0x52, 0x1F, 0x2B, 0x18, 0x17, 0x7B, 0x20, 0x0C,
+ 0xBB, 0xE1, 0x17, 0x57, 0x7A, 0x61, 0x5D, 0x6C, 0x77, 0x09, 0x88, 0xC0,
+ 0xBA, 0xD9, 0x46, 0xE2, 0x08, 0xE2, 0x4F, 0xA0, 0x74, 0xE5, 0xAB, 0x31,
+ 0x43, 0xDB, 0x5B, 0xFC, 0xE0, 0xFD, 0x10, 0x8E, 0x4B, 0x82, 0xD1, 0x20,
+ 0xA9, 0x3A, 0xD2, 0xCA, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
+};
+
+/* **************
+static const uint8_t P4096[] =
+{
+0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2,
+0x21, 0x68, 0xC2, 0x34, 0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1,
+0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74, 0x02, 0x0B, 0xBE, 0xA6,
+0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD,
+0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D,
+0xF2, 0x5F, 0x14, 0x37, 0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45,
+0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6, 0xF4, 0x4C, 0x42, 0xE9,
+0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED,
+0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11,
+0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE4, 0x5B, 0x3D,
+0xC2, 0x00, 0x7C, 0xB8, 0xA1, 0x63, 0xBF, 0x05, 0x98, 0xDA, 0x48, 0x36,
+0x1C, 0x55, 0xD3, 0x9A, 0x69, 0x16, 0x3F, 0xA8, 0xFD, 0x24, 0xCF, 0x5F,
+0x83, 0x65, 0x5D, 0x23, 0xDC, 0xA3, 0xAD, 0x96, 0x1C, 0x62, 0xF3, 0x56,
+0x20, 0x85, 0x52, 0xBB, 0x9E, 0xD5, 0x29, 0x07, 0x70, 0x96, 0x96, 0x6D,
+0x67, 0x0C, 0x35, 0x4E, 0x4A, 0xBC, 0x98, 0x04, 0xF1, 0x74, 0x6C, 0x08,
+0xCA, 0x18, 0x21, 0x7C, 0x32, 0x90, 0x5E, 0x46, 0x2E, 0x36, 0xCE, 0x3B,
+0xE3, 0x9E, 0x77, 0x2C, 0x18, 0x0E, 0x86, 0x03, 0x9B, 0x27, 0x83, 0xA2,
+0xEC, 0x07, 0xA2, 0x8F, 0xB5, 0xC5, 0x5D, 0xF0, 0x6F, 0x4C, 0x52, 0xC9,
+0xDE, 0x2B, 0xCB, 0xF6, 0x95, 0x58, 0x17, 0x18, 0x39, 0x95, 0x49, 0x7C,
+0xEA, 0x95, 0x6A, 0xE5, 0x15, 0xD2, 0x26, 0x18, 0x98, 0xFA, 0x05, 0x10,
+0x15, 0x72, 0x8E, 0x5A, 0x8A, 0xAA, 0xC4, 0x2D, 0xAD, 0x33, 0x17, 0x0D,
+0x04, 0x50, 0x7A, 0x33, 0xA8, 0x55, 0x21, 0xAB, 0xDF, 0x1C, 0xBA, 0x64,
+0xEC, 0xFB, 0x85, 0x04, 0x58, 0xDB, 0xEF, 0x0A, 0x8A, 0xEA, 0x71, 0x57,
+0x5D, 0x06, 0x0C, 0x7D, 0xB3, 0x97, 0x0F, 0x85, 0xA6, 0xE1, 0xE4, 0xC7,
+0xAB, 0xF5, 0xAE, 0x8C, 0xDB, 0x09, 0x33, 0xD7, 0x1E, 0x8C, 0x94, 0xE0,
+0x4A, 0x25, 0x61, 0x9D, 0xCE, 0xE3, 0xD2, 0x26, 0x1A, 0xD2, 0xEE, 0x6B,
+0xF1, 0x2F, 0xFA, 0x06, 0xD9, 0x8A, 0x08, 0x64, 0xD8, 0x76, 0x02, 0x73,
+0x3E, 0xC8, 0x6A, 0x64, 0x52, 0x1F, 0x2B, 0x18, 0x17, 0x7B, 0x20, 0x0C,
+0xBB, 0xE1, 0x17, 0x57, 0x7A, 0x61, 0x5D, 0x6C, 0x77, 0x09, 0x88, 0xC0,
+0xBA, 0xD9, 0x46, 0xE2, 0x08, 0xE2, 0x4F, 0xA0, 0x74, 0xE5, 0xAB, 0x31,
+0x43, 0xDB, 0x5B, 0xFC, 0xE0, 0xFD, 0x10, 0x8E, 0x4B, 0x82, 0xD1, 0x20,
+0xA9, 0x21, 0x08, 0x01, 0x1A, 0x72, 0x3C, 0x12, 0xA7, 0x87, 0xE6, 0xD7,
+0x88, 0x71, 0x9A, 0x10, 0xBD, 0xBA, 0x5B, 0x26, 0x99, 0xC3, 0x27, 0x18,
+0x6A, 0xF4, 0xE2, 0x3C, 0x1A, 0x94, 0x68, 0x34, 0xB6, 0x15, 0x0B, 0xDA,
+0x25, 0x83, 0xE9, 0xCA, 0x2A, 0xD4, 0x4C, 0xE8, 0xDB, 0xBB, 0xC2, 0xDB,
+0x04, 0xDE, 0x8E, 0xF9, 0x2E, 0x8E, 0xFC, 0x14, 0x1F, 0xBE, 0xCA, 0xA6,
+0x28, 0x7C, 0x59, 0x47, 0x4E, 0x6B, 0xC0, 0x5D, 0x99, 0xB2, 0x96, 0x4F,
+0xA0, 0x90, 0xC3, 0xA2, 0x23, 0x3B, 0xA1, 0x86, 0x51, 0x5B, 0xE7, 0xED,
+0x1F, 0x61, 0x29, 0x70, 0xCE, 0xE2, 0xD7, 0xAF, 0xB8, 0x1B, 0xDD, 0x76,
+0x21, 0x70, 0x48, 0x1C, 0xD0, 0x06, 0x91, 0x27, 0xD5, 0xB0, 0x5A, 0xA9,
+0x93, 0xB4, 0xEA, 0x98, 0x8D, 0x8F, 0xDD, 0xC1, 0x86, 0xFF, 0xB7, 0xDC,
+0x90, 0xA6, 0xC0, 0x8F, 0x4D, 0xF4, 0x35, 0xC9, 0x34, 0x06, 0x31, 0x99,
+0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
+};
+*************** */
+
+ZrtpDH::ZrtpDH(const char* type) {
+
+ uint8_t random[64];
+
+ // Well - the algo type is only 4 char thus cast to int32 and compare
+ if (*(int32_t*)type == *(int32_t*)dh2k) {
+ pkType = DH2K;
+ }
+ else if (*(int32_t*)type == *(int32_t*)dh3k) {
+ pkType = DH3K;
+ }
+ else if (*(int32_t*)type == *(int32_t*)ec25) {
+ pkType = EC25;
+ }
+ else if (*(int32_t*)type == *(int32_t*)ec38) {
+ pkType = EC38;
+ }
+ else {
+ return;
+ }
+
+// initializeOpenSSL();
+
+ if (!dhinit) {
+ bnP2048 = BN_bin2bn(P2048,sizeof(P2048),NULL);
+ bnP3072 = BN_bin2bn(P3072,sizeof(P3072),NULL);
+// bnP4096 = BN_bin2bn(P4096,sizeof(P4096),NULL);
+
+ bnP2048MinusOne = BN_dup(bnP2048);
+ BN_sub_word(bnP2048MinusOne, 1);
+
+ bnP3072MinusOne = BN_dup(bnP3072);
+ BN_sub_word(bnP3072MinusOne, 1);
+
+// bnP4096MinusOne = BN_dup(bnP4096);
+// BN_sub_word(bnP4096MinusOne, 1);
+ dhinit = 1;
+ }
+
+ DH* tmpCtx = NULL;
+ switch (pkType) {
+ case DH2K:
+ case DH3K:
+ ctx = static_cast<void*>(DH_new());
+ tmpCtx = static_cast<DH*>(ctx);
+ tmpCtx->g = BN_new();
+ BN_set_word(tmpCtx->g, DH_GENERATOR_2);
+
+ if (pkType == DH2K) {
+ tmpCtx->p = BN_dup(bnP2048);
+ RAND_bytes(random, 32);
+ tmpCtx->priv_key = BN_bin2bn(random, 32, NULL);
+ }
+ else if (pkType == DH3K) {
+ tmpCtx->p = BN_dup(bnP3072);
+ RAND_bytes(random, 64);
+ tmpCtx->priv_key = BN_bin2bn(random, 32, NULL);
+ }
+ break;
+
+ case EC25:
+ ctx = static_cast<void*>(EC_KEY_new_by_curve_name(NID_X9_62_prime256v1));
+ break;
+ case EC38:
+ ctx = static_cast<void*>(EC_KEY_new_by_curve_name(NID_secp384r1));
+ break;
+ }
+}
+
+ZrtpDH::~ZrtpDH() {
+ if (ctx == NULL)
+ return;
+
+ switch (pkType) {
+ case DH2K:
+ case DH3K:
+ DH_free(static_cast<DH*>(ctx));
+ break;
+
+ case EC25:
+ case EC38:
+ EC_KEY_free(static_cast<EC_KEY*>(ctx));
+ break;
+ }
+}
+
+int32_t ZrtpDH::computeSecretKey(uint8_t *pubKeyBytes, uint8_t *secret) {
+
+ if (pkType == DH2K || pkType == DH3K) {
+ DH* tmpCtx = static_cast<DH*>(ctx);
+
+ if (tmpCtx->pub_key != NULL) {
+ BN_free(tmpCtx->pub_key);
+ }
+ tmpCtx->pub_key = BN_bin2bn(pubKeyBytes, getDhSize(), NULL);
+ return DH_compute_key(secret, tmpCtx->pub_key, tmpCtx);
+ }
+ if (pkType == EC25 || pkType == EC38) {
+ uint8_t buffer[100];
+ int32_t ret;
+ int32_t len = getPubKeySize();
+
+ buffer[0] = POINT_CONVERSION_UNCOMPRESSED;
+ memcpy(buffer+1, pubKeyBytes, len);
+
+ EC_POINT* point = EC_POINT_new(EC_KEY_get0_group(static_cast<EC_KEY*>(ctx)));
+ EC_POINT_oct2point(EC_KEY_get0_group(static_cast<EC_KEY*>(ctx)),
+ point, buffer, len+1, NULL);
+ ret = ECDH_compute_key(secret, getDhSize(), point, static_cast<EC_KEY*>(ctx), NULL);
+ EC_POINT_free(point);
+ return ret;
+ }
+ return -1;
+}
+
+int32_t ZrtpDH::generatePublicKey()
+{
+ if (pkType == DH2K || pkType == DH3K)
+ return DH_generate_key(static_cast<DH*>(ctx));
+
+ if (pkType == EC25 || pkType == EC38)
+ return EC_KEY_generate_key(static_cast<EC_KEY*>(ctx));
+ return 0;
+}
+
+int32_t ZrtpDH::getDhSize() const
+{
+ if (pkType == DH2K || pkType == DH3K)
+ return DH_size(static_cast<DH*>(ctx));
+
+ if (pkType == EC25)
+ return 32;
+ if (pkType == EC38)
+ return 48;
+
+ return 0;
+}
+
+int32_t ZrtpDH::getPubKeySize() const
+{
+ if (pkType == DH2K || pkType == DH3K)
+ return BN_num_bytes(static_cast<DH*>(ctx)->pub_key);
+
+ if (pkType == EC25 || pkType == EC38)
+ return EC_POINT_point2oct(EC_KEY_get0_group(static_cast<EC_KEY*>(ctx)),
+ EC_KEY_get0_public_key(static_cast<EC_KEY*>(ctx)),
+ POINT_CONVERSION_UNCOMPRESSED, NULL, 0, NULL) - 1;
+ return 0;
+
+}
+
+int32_t ZrtpDH::getPubKeyBytes(uint8_t *buf) const
+{
+
+ if (pkType == DH2K || pkType == DH3K) {
+ // get len of pub_key, prepend with zeros to DH size
+ int32_t prepend = getDhSize() - getPubKeySize();
+ if (prepend > 0) {
+ memset(buf, 0, prepend);
+ }
+ return BN_bn2bin(static_cast<DH*>(ctx)->pub_key, buf + prepend);
+ }
+ if (pkType == EC25 || pkType == EC38) {
+ uint8_t buffer[100];
+
+ int len = EC_POINT_point2oct(EC_KEY_get0_group(static_cast<EC_KEY*>(ctx)),
+ EC_KEY_get0_public_key(static_cast<EC_KEY*>(ctx)),
+ POINT_CONVERSION_UNCOMPRESSED, buffer, 100, NULL);
+ memcpy(buf, buffer+1, len-1);
+ return len-1;
+ }
+ return 0;
+}
+
+int32_t ZrtpDH::checkPubKey(uint8_t *pubKeyBytes) const
+{
+ if (pkType == EC25 || pkType == EC38) {
+ uint8_t buffer[100];
+ int32_t ret;
+ int32_t len = getPubKeySize();
+
+ buffer[0] = POINT_CONVERSION_UNCOMPRESSED;
+ memcpy(buffer+1, pubKeyBytes, len);
+
+ EC_POINT* point = EC_POINT_new(EC_KEY_get0_group(static_cast<EC_KEY*>(ctx)));
+ EC_POINT_oct2point(EC_KEY_get0_group(static_cast<EC_KEY*>(ctx)),
+ point, buffer, len+1, NULL);
+ EC_KEY* chkKey = EC_KEY_new();
+ EC_KEY_set_group(chkKey, EC_KEY_get0_group(static_cast<EC_KEY*>(ctx)));
+ EC_KEY_set_public_key(chkKey, point);
+ ret = EC_KEY_check_key(chkKey);
+
+ EC_POINT_free(point);
+ EC_KEY_free(chkKey);
+
+ return ret;
+ }
+
+ BIGNUM* pubKeyOther = BN_bin2bn(pubKeyBytes, getDhSize(), NULL);
+
+ if (pkType == DH2K) {
+ if (BN_cmp(bnP2048MinusOne, pubKeyOther) == 0)
+ return 0;
+ }
+ else if (pkType == DH3K) {
+ if (BN_cmp(bnP3072MinusOne, pubKeyOther) == 0)
+ return 0;
+ }
+ else {
+// if (BN_cmp(bnP4096MinusOne, pubKeyOther) == 0)
+ return 0;
+ }
+ int one = BN_is_one(pubKeyOther);
+ if (one == 1)
+ return 0;
+
+ BN_free(pubKeyOther);
+ return 1;
+}
+
+const char* ZrtpDH::getDHtype()
+{
+ switch (pkType) {
+ case DH2K:
+ return dh2k;
+ break;
+ case DH3K:
+ return dh3k;
+ break;
+ case EC25:
+ return ec25;
+ break;
+ case EC38:
+ return ec38;
+ break;
+ }
+ return NULL;
+}
+
+/** EMACS **
+ * Local variables:
+ * mode: c++
+ * c-default-style: ellemtel
+ * c-basic-offset: 4
+ * End:
+ */
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-24 14:01:35 +0000