code review 5755054: go.crypto/ssh: add support for diffie-hellman-group1-sha1.

ssh/server.go

 // Copyright 2011 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 package ssh
 
 import (
         "bytes"
         "crypto"
         "crypto/rand"
@@ skipping 254 matching lines @@
                 }
         }
 
         var H, K []byte
         var hashFunc crypto.Hash
         switch kexAlgo {
         case kexAlgoDH14SHA1:
                 hashFunc = crypto.SHA1
                 dhGroup14Once.Do(initDHGroup14)
                 H, K, err = s.kexDH(dhGroup14, hashFunc, &magics, hostKeyAlgo)
+        case keyAlgoDH1SHA1:
+                hashFunc = crypto.SHA1
+                dhGroup1Once.Do(initDHGroup1)
+                H, K, err = s.kexDH(dhGroup1, hashFunc, &magics, hostKeyAlgo)
         default:
                 err = errors.New("ssh: unexpected key exchange algorithm " + kexAlgo)
         }
         if err != nil {
                 return err
         }
 
         if err = s.writePacket([]byte{msgNewKeys}); err != nil {
                 return err
         }
@@ skipping 354 matching lines @@
 func Listen(network, addr string, config *ServerConfig) (*Listener, error) {
         l, err := net.Listen(network, addr)
         if err != nil {
                 return nil, err
         }
         return &Listener{
                 l,
                 config,
         }, nil
 }