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changeset 595:2895626d864f

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Add diffie-hellman-group14-sha1 KEX method
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Feb 2011 12:42:42 +0000
parents a98a2138364a
children e001bd424f12
files common-algo.c common-kex.c sysoptions.h
diffstat 3 files changed, 45 insertions(+), 4 deletions(-) [+]
line wrap: on
line diff
--- a/common-algo.c	Wed Feb 23 15:50:30 2011 +0000
+++ b/common-algo.c	Thu Feb 24 12:42:42 2011 +0000
@@ -194,6 +194,7 @@
 
 algo_type sshkex[] = {
 	{"diffie-hellman-group1-sha1", DROPBEAR_KEX_DH_GROUP1, NULL, 1, NULL},
+	{"diffie-hellman-group14-sha1", DROPBEAR_KEX_DH_GROUP14, NULL, 1, NULL},
 	{NULL, 0, NULL, 0, NULL}
 };
 
--- a/common-kex.c	Wed Feb 23 15:50:30 2011 +0000
+++ b/common-kex.c	Thu Feb 24 12:42:42 2011 +0000
@@ -36,7 +36,8 @@
 #include "runopts.h"
 
 /* diffie-hellman-group1-sha1 value for p */
-static const unsigned char dh_p_val[] = {
+#define DH_P_1_LEN 128
+static const unsigned char dh_p_1[DH_P_1_LEN] = {
 	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,
@@ -48,8 +49,34 @@
 	0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11,
 	0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE6, 0x53, 0x81,
 	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
-#define DH_P_LEN sizeof(dh_p_val)
 
+/* diffie-hellman-group14-sha1 value for p */
+#define DH_P_14_LEN 256
+static const unsigned char dh_p_14[DH_P_14_LEN] = {
+	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};
+
+/* Same for group1 and group14 */
 static const int DH_G_VAL = 2;
 
 static void kexinitialise();
@@ -492,6 +519,18 @@
 	TRACE(("leave recv_msg_kexinit"))
 }
 
+static void load_dh_p(mp_int * dh_p)
+{
+	switch (ses.newkeys->algo_kex) {
+		case DROPBEAR_KEX_DH_GROUP1:
+			bytes_to_mp(dh_p, dh_p_1, DH_P_1_LEN);
+			break;
+		case DROPBEAR_KEX_DH_GROUP14:
+			bytes_to_mp(dh_p, dh_p_14, DH_P_14_LEN);
+			break;
+	}
+}
+
 /* Initialises and generate one side of the diffie-hellman key exchange values.
  * See the ietf-secsh-transport draft, section 6, for details */
 /* dh_pub and dh_priv MUST be already initialised */
@@ -506,7 +545,7 @@
 	m_mp_init_multi(&dh_g, &dh_p, &dh_q, NULL);
 
 	/* read the prime and generator*/
-	bytes_to_mp(&dh_p, (unsigned char*)dh_p_val, DH_P_LEN);
+	load_dh_p(&dh_p);
 	
 	if (mp_set_int(&dh_g, DH_G_VAL) != MP_OKAY) {
 		dropbear_exit("Diffie-Hellman error");
@@ -544,7 +583,7 @@
 
 	/* read the prime and generator*/
 	m_mp_init(&dh_p);
-	bytes_to_mp(&dh_p, dh_p_val, DH_P_LEN);
+	load_dh_p(&dh_p);
 
 	/* Check that dh_pub_them (dh_e or dh_f) is in the range [1, p-1] */
 	if (mp_cmp(dh_pub_them, &dh_p) != MP_LT 
--- a/sysoptions.h	Wed Feb 23 15:50:30 2011 +0000
+++ b/sysoptions.h	Thu Feb 24 12:42:42 2011 +0000
@@ -60,6 +60,7 @@
 
 /* various algorithm identifiers */
 #define DROPBEAR_KEX_DH_GROUP1 0
+#define DROPBEAR_KEX_DH_GROUP14 1
 
 #define DROPBEAR_SIGNKEY_ANY 0
 #define DROPBEAR_SIGNKEY_RSA 1