X-Git-Url: http://git.silcnet.org/gitweb/?a=blobdiff_plain;f=lib%2Fsilcske%2Fpayload.c;h=9bf2aa862e9346096871103aa27c50fa43c6941d;hb=a818c5b5411bbc4436d1c5f011236985c96bb787;hp=c5163358d17b37fb556e9319f2d33973afb9aac2;hpb=318d79b391bf6288e3e28c840217a7097f3d0392;p=silc.git

diff --git a/lib/silcske/payload.c b/lib/silcske/payload.c
index c5163358..9bf2aa86 100644
--- a/lib/silcske/payload.c
+++ b/lib/silcske/payload.c
@@ -2,9 +2,9 @@
 
   payload.c
 
-  Author: Pekka Riikonen <priikone@poseidon.pspt.fi>
+  Author: Pekka Riikonen <priikone@silcnet.org>
 
-  Copyright (C) 2000 Pekka Riikonen
+  Copyright (C) 2000 - 2001 Pekka Riikonen
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,36 +17,9 @@
   GNU General Public License for more details.
 
 */
-/* XXX TODO: This is not optimized version and should be optimized! 
-   Use *_ALLOC buffer formatting in payload decodings! */
-/*
- * $Id$
- * $Log$
- * Revision 1.5  2000/07/19 07:04:37  priikone
- * 	Added version detection support to SKE. Minor bugfixes.
- *
- * Revision 1.4  2000/07/10 05:34:22  priikone
- * 	Added mp binary encoding as protocols defines.
- *
- * Revision 1.3  2000/07/07 06:46:43  priikone
- * 	Removed ske_verify_public_key function as it is not needed
- * 	anymore. Added support to the public key verification as callback
- * 	function. Other minor changes and bug fixes.
- *
- * Revision 1.2  2000/07/05 06:05:15  priikone
- * 	Global cosmetic change.
- *
- * Revision 1.1.1.1  2000/06/27 11:36:56  priikone
- * 	Imported from internal CVS/Added Log headers.
- *
- *
- */
+/* $Id$ */
 
 #include "silcincludes.h"
-#include "payload_internal.h"
-
-/* Temporary buffer used in payload decoding */
-unsigned char buf[16384];
 
 /* Encodes Key Exchange Start Payload into a SILC Buffer to be sent
    to the other end. */
@@ -56,43 +29,49 @@ SilcSKEStatus silc_ske_payload_start_encode(SilcSKE ske,
 					    SilcBuffer *return_buffer)
 {
   SilcBuffer buf;
+  int ret;
 
   SILC_LOG_DEBUG(("Encoding KE Start Payload"));
 
   if (!payload)
     return SILC_SKE_STATUS_ERROR;
 
-  /* Allocate channel payload buffer. */
   buf = silc_buffer_alloc(payload->len);
-
-  silc_buffer_pull_tail(buf, payload->len);
+  silc_buffer_pull_tail(buf, SILC_BUFFER_END(buf));
 
   /* Encode the payload */
-  silc_buffer_format(buf,
-		     SILC_STR_UI_CHAR(0),        /* RESERVED field */
-		     SILC_STR_UI_CHAR(payload->flags),
-		     SILC_STR_UI_SHORT(payload->len),
-		     SILC_STR_UI_XNSTRING(payload->cookie, 
-					  payload->cookie_len),
-		     SILC_STR_UI_SHORT(payload->version_len),
-		     SILC_STR_UI_XNSTRING(payload->version, 
-					  payload->version_len),
-		     SILC_STR_UI_SHORT(payload->ke_grp_len),
-		     SILC_STR_UI_XNSTRING(payload->ke_grp_list,
-					  payload->ke_grp_len),
-		     SILC_STR_UI_SHORT(payload->pkcs_alg_len),
-		     SILC_STR_UI_XNSTRING(payload->pkcs_alg_list,
-					  payload->pkcs_alg_len),
-		     SILC_STR_UI_SHORT(payload->enc_alg_len),
-		     SILC_STR_UI_XNSTRING(payload->enc_alg_list,
-					  payload->enc_alg_len),
-		     SILC_STR_UI_SHORT(payload->hash_alg_len),
-		     SILC_STR_UI_XNSTRING(payload->hash_alg_list,
-					  payload->hash_alg_len),
-		     SILC_STR_UI_SHORT(payload->comp_alg_len),
-		     SILC_STR_UI_XNSTRING(payload->comp_alg_list,
-					  payload->comp_alg_len),
-		     SILC_STR_END);
+  ret = silc_buffer_format(buf,
+			   SILC_STR_UI_CHAR(0),        /* RESERVED field */
+			   SILC_STR_UI_CHAR(payload->flags),
+			   SILC_STR_UI_SHORT(payload->len),
+			   SILC_STR_UI_XNSTRING(payload->cookie, 
+						payload->cookie_len),
+			   SILC_STR_UI_SHORT(payload->version_len),
+			   SILC_STR_UI_XNSTRING(payload->version, 
+						payload->version_len),
+			   SILC_STR_UI_SHORT(payload->ke_grp_len),
+			   SILC_STR_UI_XNSTRING(payload->ke_grp_list,
+						payload->ke_grp_len),
+			   SILC_STR_UI_SHORT(payload->pkcs_alg_len),
+			   SILC_STR_UI_XNSTRING(payload->pkcs_alg_list,
+						payload->pkcs_alg_len),
+			   SILC_STR_UI_SHORT(payload->enc_alg_len),
+			   SILC_STR_UI_XNSTRING(payload->enc_alg_list,
+						payload->enc_alg_len),
+			   SILC_STR_UI_SHORT(payload->hash_alg_len),
+			   SILC_STR_UI_XNSTRING(payload->hash_alg_list,
+						payload->hash_alg_len),
+			   SILC_STR_UI_SHORT(payload->hmac_alg_len),
+			   SILC_STR_UI_XNSTRING(payload->hmac_alg_list,
+						payload->hmac_alg_len),
+			   SILC_STR_UI_SHORT(payload->comp_alg_len),
+			   SILC_STR_UI_XNSTRING(payload->comp_alg_list,
+						payload->comp_alg_len),
+			   SILC_STR_END);
+  if (ret == -1) {
+    silc_buffer_free(buf);
+    return SILC_SKE_STATUS_ERROR;
+  }
 
   /* Return the encoded buffer */
   *return_buffer = buf;
@@ -113,142 +92,55 @@ silc_ske_payload_start_decode(SilcSKE ske,
   SilcSKEStartPayload *payload;
   SilcSKEStatus status = SILC_SKE_STATUS_ERROR;
   unsigned char tmp;
-  int len, len2;
+  int ret;
 
   SILC_LOG_DEBUG(("Decoding Key Exchange Start Payload"));
 
   SILC_LOG_HEXDUMP(("KE Start Payload"), buffer->data, buffer->len);
 
   payload = silc_calloc(1, sizeof(*payload));
-  memset(buf, 0, sizeof(buf));
-
-  /* Parse the entire payload */
-  silc_buffer_unformat(buffer,
-		       SILC_STR_UI_CHAR(&tmp),     /* RESERVED Field */
-		       SILC_STR_UI_CHAR(&payload->flags),
-		       SILC_STR_UI_SHORT(&payload->len),
-		       SILC_STR_UI_XNSTRING(&buf, SILC_SKE_COOKIE_LEN),
-		       SILC_STR_UI16_NSTRING_ALLOC(&payload->version,
-						   &payload->version_len),
-		       SILC_STR_UI_SHORT(&payload->ke_grp_len),
-		       SILC_STR_END);
-
-  if (tmp != 0) {
-    SILC_LOG_DEBUG(("Bad reserved field"));
-    status = SILC_SKE_STATUS_BAD_RESERVED_FIELD;
-    goto err;
-  }
-
-  if (payload->len != buffer->len) {
-    SILC_LOG_DEBUG(("Bad payload length"));
-    status = SILC_SKE_STATUS_BAD_PAYLOAD_LENGTH;
-    goto err;
-  }
-
-  if (payload->ke_grp_len < 1) {
-    SILC_LOG_DEBUG(("Bad payload length"));
-    status = SILC_SKE_STATUS_BAD_PAYLOAD_LENGTH;
-    goto err;
-  }
-
-  len2 = len = 1 + 1 + 2 + SILC_SKE_COOKIE_LEN + 2 + payload->version_len + 2;
-  silc_buffer_pull(buffer, len);
-
-  /* Copy cookie from payload */
-  payload->cookie = silc_calloc(SILC_SKE_COOKIE_LEN, 
-				sizeof(unsigned char));
   payload->cookie_len = SILC_SKE_COOKIE_LEN;
-  memcpy(payload->cookie, buf, SILC_SKE_COOKIE_LEN);
-  memset(buf, 0, sizeof(buf));
 
-  silc_buffer_unformat(buffer,
-		       SILC_STR_UI_XNSTRING(&buf, payload->ke_grp_len),
-		       SILC_STR_UI_SHORT(&payload->pkcs_alg_len),
-		       SILC_STR_END);
-
-  if (payload->pkcs_alg_len < 1) {
-    SILC_LOG_DEBUG(("Bad payload length"));
-    status = SILC_SKE_STATUS_BAD_PAYLOAD_LENGTH;
+  /* Parse start of the payload */
+  ret = 
+    silc_buffer_unformat(buffer,
+			 SILC_STR_UI_CHAR(&tmp),     /* RESERVED Field */
+			 SILC_STR_UI_CHAR(&payload->flags),
+			 SILC_STR_UI_SHORT(&payload->len),
+			 SILC_STR_UI_XNSTRING_ALLOC(&payload->cookie, 
+						    payload->cookie_len),
+			 SILC_STR_UI16_NSTRING_ALLOC(&payload->version,
+						     &payload->version_len),
+			 SILC_STR_UI16_NSTRING_ALLOC(&payload->ke_grp_list,
+						     &payload->ke_grp_len),
+			 SILC_STR_UI16_NSTRING_ALLOC(&payload->pkcs_alg_list,
+						     &payload->pkcs_alg_len),
+			 SILC_STR_UI16_NSTRING_ALLOC(&payload->enc_alg_list,
+						     &payload->enc_alg_len),
+			 SILC_STR_UI16_NSTRING_ALLOC(&payload->hash_alg_list,
+						     &payload->hash_alg_len),
+			 SILC_STR_UI16_NSTRING_ALLOC(&payload->hmac_alg_list,
+						     &payload->hmac_alg_len),
+			 SILC_STR_UI16_NSTRING_ALLOC(&payload->comp_alg_list,
+						     &payload->comp_alg_len),
+			 SILC_STR_END);
+  if (ret == -1) {
+    status = SILC_SKE_STATUS_ERROR;
     goto err;
   }
 
-  len2 += len = payload->ke_grp_len + 2;
-  silc_buffer_pull(buffer, len);
-
-  /* Copy KE groups from payload */
-  payload->ke_grp_list = silc_calloc(payload->ke_grp_len + 1, 
-				     sizeof(unsigned char));
-  memcpy(payload->ke_grp_list, buf, payload->ke_grp_len);
-  memset(buf, 0, sizeof(buf));
-
-  silc_buffer_unformat(buffer,
-		       SILC_STR_UI_XNSTRING(&buf, payload->pkcs_alg_len),
-		       SILC_STR_UI_SHORT(&payload->enc_alg_len),
-		       SILC_STR_END);
-
-  if (payload->enc_alg_len < 1) {
-    SILC_LOG_DEBUG(("Bad payload length"));
-    status = SILC_SKE_STATUS_BAD_PAYLOAD_LENGTH;
+  if (tmp != 0) {
+    SILC_LOG_DEBUG(("Bad reserved field"));
+    status = SILC_SKE_STATUS_BAD_RESERVED_FIELD;
     goto err;
   }
 
-  len2 += len = payload->pkcs_alg_len + 2;
-  silc_buffer_pull(buffer, len);
-
-  /* Copy PKCS algs from payload */
-  payload->pkcs_alg_list = silc_calloc(payload->pkcs_alg_len + 1, 
-				       sizeof(unsigned char));
-  memcpy(payload->pkcs_alg_list, buf, payload->pkcs_alg_len);
-  memset(buf, 0, sizeof(buf));
-
-  silc_buffer_unformat(buffer,
-		       SILC_STR_UI_XNSTRING(&buf, payload->enc_alg_len),
-		       SILC_STR_UI_SHORT(&payload->hash_alg_len),
-		       SILC_STR_END);
-
-  if (payload->hash_alg_len < 1) {
+  if (payload->len != buffer->len) {
     SILC_LOG_DEBUG(("Bad payload length"));
     status = SILC_SKE_STATUS_BAD_PAYLOAD_LENGTH;
     goto err;
   }
 
-  len2 += len = payload->enc_alg_len + 2;
-  silc_buffer_pull(buffer, len);
-
-  /* Copy encryption algs from payload */
-  payload->enc_alg_list = silc_calloc(payload->enc_alg_len + 1, 
-				      sizeof(unsigned char));
-  memcpy(payload->enc_alg_list, buf, payload->enc_alg_len);
-  memset(buf, 0, sizeof(buf));
-
-  silc_buffer_unformat(buffer,
-		       SILC_STR_UI_XNSTRING(&buf, payload->hash_alg_len),
-		       SILC_STR_UI_SHORT(&payload->comp_alg_len),
-		       SILC_STR_END);
-
-  len2 += len = payload->hash_alg_len + 2;
-  silc_buffer_pull(buffer, len);
-
-  /* Copy hash algs from payload */
-  payload->hash_alg_list = silc_calloc(payload->hash_alg_len + 1, 
-				       sizeof(unsigned char));
-  memcpy(payload->hash_alg_list, buf, payload->hash_alg_len);
-  memset(buf, 0, sizeof(buf));
-
-  if (payload->comp_alg_len) {
-    silc_buffer_unformat(buffer,
-			 SILC_STR_UI_XNSTRING(&buf, payload->comp_alg_len),
-			 SILC_STR_END);
-
-    /* Copy compression algs from payload */
-    payload->comp_alg_list = silc_calloc(payload->comp_alg_len + 1, 
-					 sizeof(unsigned char));
-    memcpy(payload->comp_alg_list, buf, payload->comp_alg_len);
-    memset(buf, 0, sizeof(buf));
-  }
-
-  silc_buffer_push(buffer, len2);
-
   /* Return the payload */
   *return_payload = payload;
 
@@ -257,6 +149,7 @@ silc_ske_payload_start_decode(SilcSKE ske,
  err:
   silc_ske_payload_start_free(payload);
 
+  ske->status = status;
   return status;
 }
 
@@ -265,245 +158,147 @@ silc_ske_payload_start_decode(SilcSKE ske,
 void silc_ske_payload_start_free(SilcSKEStartPayload *payload)
 {
   if (payload) {
-    if (payload->cookie)
-      silc_free(payload->cookie);
-    if (payload->version)
-      silc_free(payload->version);
-    if (payload->ke_grp_list)
-      silc_free(payload->ke_grp_list);
-    if (payload->pkcs_alg_list)
-      silc_free(payload->pkcs_alg_list);
-    if (payload->enc_alg_list)
-      silc_free(payload->enc_alg_list);
-    if (payload->hash_alg_list)
-      silc_free(payload->hash_alg_list);
-    if (payload->comp_alg_list)
-      silc_free(payload->comp_alg_list);
+    silc_free(payload->cookie);
+    silc_free(payload->version);
+    silc_free(payload->ke_grp_list);
+    silc_free(payload->pkcs_alg_list);
+    silc_free(payload->enc_alg_list);
+    silc_free(payload->hash_alg_list);
+    silc_free(payload->hmac_alg_list);
+    silc_free(payload->comp_alg_list);
     silc_free(payload);
   }
 }
 
-/* Encodes Key Exchange 1 Payload into a SILC Buffer to be sent
-   to the other end. */
+/* Encodes Key Exchange Payload into a SILC Buffer to be sent to the other
+   end. */
 
-SilcSKEStatus silc_ske_payload_one_encode(SilcSKE ske,
-					  SilcSKEOnePayload *payload,
-					  SilcBuffer *return_buffer)
+SilcSKEStatus silc_ske_payload_ke_encode(SilcSKE ske,
+					 SilcSKEKEPayload *payload,
+					 SilcBuffer *return_buffer)
 {
   SilcBuffer buf;
-  unsigned char *e_str;
-  unsigned int e_len;
+  unsigned char *x_str;
+  SilcUInt32 x_len;
+  int ret;
 
-  SILC_LOG_DEBUG(("Encoding KE 1 Payload"));
+  SILC_LOG_DEBUG(("Encoding KE Payload"));
 
   if (!payload)
     return SILC_SKE_STATUS_ERROR;
 
-  /* Encode the integer into binary data */
-  e_str = silc_mp_mp2bin(&payload->e, &e_len);
-  if (!e_str)
+  if (ske->start_payload && 
+      ske->start_payload->flags & SILC_SKE_SP_FLAG_MUTUAL &&
+      !payload->sign_data) {
+    SILC_LOG_DEBUG(("Signature data is missing"));
     return SILC_SKE_STATUS_ERROR;
+  }
+
+  /* Encode the integer into binary data */
+  x_str = silc_mp_mp2bin(&payload->x, 0, &x_len);
 
   /* Allocate channel payload buffer. The length of the buffer
-     is 2 + e. */
-  buf = silc_buffer_alloc(e_len + 2 + payload->pk_len + 2 + 2);
+     is 4 + public key + 2 + x + 2 + signature. */
+  buf = silc_buffer_alloc(4 + payload->pk_len + 2 + x_len + 
+			  2 + payload->sign_len);
   silc_buffer_pull_tail(buf, SILC_BUFFER_END(buf));
 
   /* Encode the payload */
-  silc_buffer_format(buf, 
-		     SILC_STR_UI_SHORT(payload->pk_len),
-		     SILC_STR_UI_SHORT(payload->pk_type),
-		     SILC_STR_UI_XNSTRING(payload->pk_data, 
-					  payload->pk_len),
-		     SILC_STR_UI_SHORT(e_len),
-		     SILC_STR_UI_XNSTRING(e_str, e_len),
-		     SILC_STR_END);
+  ret = silc_buffer_format(buf, 
+			   SILC_STR_UI_SHORT(payload->pk_len),
+			   SILC_STR_UI_SHORT(payload->pk_type),
+			   SILC_STR_UI_XNSTRING(payload->pk_data, 
+						payload->pk_len),
+			   SILC_STR_UI_SHORT(x_len),
+			   SILC_STR_UI_XNSTRING(x_str, x_len),
+			   SILC_STR_UI_SHORT(payload->sign_len),
+			   SILC_STR_UI_XNSTRING(payload->sign_data, 
+						payload->sign_len),
+			   SILC_STR_END);
+  if (ret == -1) {
+    memset(x_str, 'F', x_len);
+    silc_free(x_str);
+    silc_buffer_free(buf);
+    return SILC_SKE_STATUS_ERROR;
+  }
 
   /* Return encoded buffer */
   *return_buffer = buf;
 
-  memset(e_str, 'F', e_len);
-  silc_free(e_str);
+  SILC_LOG_HEXDUMP(("KE Payload"), buf->data, buf->len);
+
+  memset(x_str, 'F', x_len);
+  silc_free(x_str);
 
   return SILC_SKE_STATUS_OK;
 }
 
-/* Parses the Key Exchange 1 Payload. Parsed data is returned
-   to allocated payload structure. */
+/* Parses the Key Exchange Payload. Parsed data is returned to allocated
+   payload structure. */
 
-SilcSKEStatus silc_ske_payload_one_decode(SilcSKE ske,
-					  SilcBuffer buffer,
-					  SilcSKEOnePayload **return_payload)
+SilcSKEStatus silc_ske_payload_ke_decode(SilcSKE ske,
+					 SilcBuffer buffer,
+					 SilcSKEKEPayload **return_payload)
 {
-  SilcSKEOnePayload *payload;
   SilcSKEStatus status = SILC_SKE_STATUS_ERROR;
-  unsigned char *e;
-  unsigned short e_len;
+  SilcSKEKEPayload *payload;
+  unsigned char *x = NULL;
+  SilcUInt16 x_len;
+  SilcUInt32 tot_len = 0, len2;
+  int ret;
 
-  SILC_LOG_DEBUG(("Decoding Key Exchange 1 Payload"));
+  SILC_LOG_DEBUG(("Decoding Key Exchange Payload"));
 
-  SILC_LOG_HEXDUMP(("KE 1 Payload"), buffer->data, buffer->len);
+  SILC_LOG_HEXDUMP(("KE Payload"), buffer->data, buffer->len);
 
   payload = silc_calloc(1, sizeof(*payload));
 
-  silc_buffer_unformat(buffer,
-		       SILC_STR_UI_SHORT(&payload->pk_len),
-		       SILC_STR_UI_SHORT(&payload->pk_type),
-		       SILC_STR_END);
-		       
-  if (payload->pk_len < 5) {
-    status = SILC_SKE_STATUS_BAD_PAYLOAD;
-    goto err;
-  }
-
-  silc_buffer_pull(buffer, 2 + 2);
-  silc_buffer_unformat(buffer,
-		       SILC_STR_UI_XNSTRING_ALLOC(&payload->pk_data,
-						  payload->pk_len),
-		       SILC_STR_UI16_NSTRING_ALLOC(&e, &e_len),
-		       SILC_STR_END);
+  len2 = buffer->len;
 
-  if (e_len < 3) {
-    status = SILC_SKE_STATUS_BAD_PAYLOAD;
+  /* Parse start of the payload */
+  ret = silc_buffer_unformat(buffer,
+			     SILC_STR_UI_SHORT(&payload->pk_len),
+			     SILC_STR_UI_SHORT(&payload->pk_type),
+			     SILC_STR_END);
+  if (ret == -1) {
+    status = SILC_SKE_STATUS_ERROR;
     goto err;
   }
 
-  silc_buffer_push(buffer, 2 + 2);
-
-  if (payload->pk_len + 2 + 2 + 2 + e_len != buffer->len) {
+  if (payload->pk_type == 0) {
     status = SILC_SKE_STATUS_BAD_PAYLOAD;
     goto err;
   }
 
-  /* Decode the HEX string to integer */
-  silc_mp_init(&payload->e);
-  silc_mp_bin2mp(e, e_len, &payload->e);
-  memset(e, 0, sizeof(e_len));
-  silc_free(e);
-
-  /* Return the payload */
-  *return_payload = payload;
-
-  return SILC_SKE_STATUS_OK;
-
- err:
-  silc_free(payload);
-  return status;
-}
-
-/* Free's KE1 Payload */
-
-void silc_ske_payload_one_free(SilcSKEOnePayload *payload)
-{
-  if (payload) {
-    if (payload->pk_data)
-      silc_free(payload->pk_data);
-    silc_free(payload);
-  }
-}
-
-/* Encodes Key Exchange 2 Payload into a SILC Buffer to be sent
-   to the other end. */
-
-SilcSKEStatus silc_ske_payload_two_encode(SilcSKE ske,
-					  SilcSKETwoPayload *payload,
-					  SilcBuffer *return_buffer)
-{
-  SilcBuffer buf;
-  unsigned char *f_str;
-  unsigned int f_len;
-  unsigned int len;
-
-  SILC_LOG_DEBUG(("Encoding KE 2 Payload"));
-
-  if (!payload)
-    return SILC_SKE_STATUS_ERROR;
-
-  /* Encode the integer into HEX string */
-  f_str = silc_mp_mp2bin(&payload->f, &f_len);
-
-  /* Allocate channel payload buffer. The length of the buffer
-     is 2 + 2 + public key + 2 + f + 2 + signature. */
-  len = payload->pk_len + 2 + 2 + f_len + 2 + payload->sign_len + 2;
-  buf = silc_buffer_alloc(len);
-
-  silc_buffer_pull_tail(buf, len);
-
-  /* Encode the payload */
-  silc_buffer_format(buf, 
-		     SILC_STR_UI_SHORT(payload->pk_len),
-		     SILC_STR_UI_SHORT(payload->pk_type),
-		     SILC_STR_UI_XNSTRING(payload->pk_data, 
-					  payload->pk_len),
-		     SILC_STR_UI_SHORT(f_len),
-		     SILC_STR_UI_XNSTRING(f_str, f_len),
-		     SILC_STR_UI_SHORT(payload->sign_len),
-		     SILC_STR_UI_XNSTRING(payload->sign_data, 
-					  payload->sign_len),
-		     SILC_STR_END);
-
-  /* Return encoded buffer */
-  *return_buffer = buf;
-
-  memset(f_str, 'F', f_len);
-  silc_free(f_str);
-
-  return SILC_SKE_STATUS_OK;
-}
-
-/* Parses the Key Exchange 2 Payload. Parsed data is returned
-   to allocated payload structure. */
-
-SilcSKEStatus silc_ske_payload_two_decode(SilcSKE ske,
-					  SilcBuffer buffer,
-					  SilcSKETwoPayload **return_payload)
-{
-  SilcSKEStatus status = SILC_SKE_STATUS_ERROR;
-  SilcSKETwoPayload *payload;
-  unsigned char *f;
-  unsigned short f_len;
-  unsigned int tot_len = 0, len2;
-
-  SILC_LOG_DEBUG(("Decoding Key Exchange 2 Payload"));
-
-  SILC_LOG_HEXDUMP(("KE 2 Payload"), buffer->data, buffer->len);
-
-  payload = silc_calloc(1, sizeof(*payload));
-  memset(buf, 0, sizeof(buf));
-
-  len2 = buffer->len;
-
-  /* Parse the payload */
-  silc_buffer_unformat(buffer,
-		       SILC_STR_UI_SHORT(&payload->pk_len),
-		       SILC_STR_UI_SHORT(&payload->pk_type),
-		       SILC_STR_END);
+  tot_len += payload->pk_len + 4;
 
-  if (payload->pk_len < 5) {
-    status = SILC_SKE_STATUS_BAD_PAYLOAD;
+  /* Parse PK data and the signature */
+  silc_buffer_pull(buffer, 4);
+  ret = silc_buffer_unformat(buffer,
+			     SILC_STR_UI_XNSTRING_ALLOC(&payload->pk_data,
+							payload->pk_len),
+			     SILC_STR_UI16_NSTRING_ALLOC(&x, &x_len),
+			     SILC_STR_UI16_NSTRING_ALLOC(&payload->sign_data, 
+							 &payload->sign_len),
+			     SILC_STR_END);
+  if (ret == -1) {
+    status = SILC_SKE_STATUS_ERROR;
     goto err;
   }
 
-  tot_len += payload->pk_len + 4;
-
-  silc_buffer_pull(buffer, 4);
-  silc_buffer_unformat(buffer,
-		       SILC_STR_UI_XNSTRING_ALLOC(&payload->pk_data,
-						  payload->pk_len),
-		       SILC_STR_UI16_NSTRING_ALLOC(&f, &f_len),
-		       SILC_STR_UI16_NSTRING_ALLOC(&payload->sign_data, 
-						   &payload->sign_len),
-		       SILC_STR_END);
-
-  tot_len += f_len + 2;
+  tot_len += x_len + 2;
   tot_len += payload->sign_len + 2;
 
-  if (f_len < 3) {
+  if (x_len < 3) {
     status = SILC_SKE_STATUS_BAD_PAYLOAD;
     goto err;
   }
 
-  if (payload->sign_len < 3) {
+  if (ske->start_payload && 
+      (ske->start_payload->flags & SILC_SKE_SP_FLAG_MUTUAL) &&
+      (payload->sign_len < 3 || !payload->sign_data)) {
+    SILC_LOG_DEBUG(("The signature data is missing - both parties are "
+		    "required to do authentication"));
     status = SILC_SKE_STATUS_BAD_PAYLOAD;
     goto err;
   }
@@ -513,11 +308,11 @@ SilcSKEStatus silc_ske_payload_two_decode(SilcSKE ske,
     goto err;
   }
   
-  /* Decode the HEX string to integer */
-  silc_mp_init(&payload->f);
-  silc_mp_bin2mp(f, f_len, &payload->f);
-  memset(f, 0, sizeof(f_len));
-  silc_free(f);
+  /* Decode the binary data to integer */
+  silc_mp_init(&payload->x);
+  silc_mp_bin2mp(x, x_len, &payload->x);
+  memset(x, 0, sizeof(x_len));
+  silc_free(x);
 
   /* Return the payload */
   *return_payload = payload;
@@ -525,23 +320,22 @@ SilcSKEStatus silc_ske_payload_two_decode(SilcSKE ske,
   return SILC_SKE_STATUS_OK;
 
  err:
-  if (payload->pk_data)
-    silc_free(payload->pk_data);
-  if (payload->sign_data)
-    silc_free(payload->sign_data);
+  silc_free(payload->pk_data);
+  silc_free(payload->sign_data);
+  silc_free(x);
   silc_free(payload);
+  ske->status = status;
   return status;
 }
 
-/* Free's KE2 Payload */
+/* Free's KE Payload */
 
-void silc_ske_payload_two_free(SilcSKETwoPayload *payload)
+void silc_ske_payload_ke_free(SilcSKEKEPayload *payload)
 {
   if (payload) {
-    if (payload->pk_data)
-      silc_free(payload->pk_data);
-    if (payload->sign_data)
-      silc_free(payload->sign_data);
+    silc_free(payload->pk_data);
+    silc_mp_uninit(&payload->x);
+    silc_free(payload->sign_data);
     silc_free(payload);
   }
 }