http://www.jcraft.com/jsch/: JSch is a pure Java implementation of SSH2 (JCraft,Inc.) 
class com.jcraft.jsch.UserAuthNone extends com.jcraft.jsch.UserAuth
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.jcraft.jsch.UserAuthNone
  super_class: com.jcraft.jsch.UserAuth
{
  private static final int SSH_MSG_SERVICE_ACCEPT;
    descriptor: I
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 6

  private java.lang.String methods;
    descriptor: Ljava/lang/String;
    flags: (0x0002) ACC_PRIVATE

  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.jcraft.jsch.UserAuthNone this
         0: .line 32
            aload 0 /* this */
            invokespecial com.jcraft.jsch.UserAuth.<init>:()V
         1: .line 34
            aload 0 /* this */
            aconst_null
            putfield com.jcraft.jsch.UserAuthNone.methods:Ljava/lang/String;
         2: .line 32
            return
        end local 0 // com.jcraft.jsch.UserAuthNone this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/jcraft/jsch/UserAuthNone;

  public boolean start(com.jcraft.jsch.Session);
    descriptor: (Lcom/jcraft/jsch/Session;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=7, args_size=2
        start local 0 // com.jcraft.jsch.UserAuthNone this
        start local 1 // com.jcraft.jsch.Session session
         0: .line 37
            aload 0 /* this */
            aload 1 /* session */
            invokespecial com.jcraft.jsch.UserAuth.start:(Lcom/jcraft/jsch/Session;)Z
            pop
         1: .line 43
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.packet:Lcom/jcraft/jsch/Packet;
            invokevirtual com.jcraft.jsch.Packet.reset:()V
         2: .line 44
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
            iconst_5
            invokevirtual com.jcraft.jsch.Buffer.putByte:(B)V
         3: .line 45
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
            ldc "ssh-userauth"
            invokestatic com.jcraft.jsch.Util.str2byte:(Ljava/lang/String;)[B
            invokevirtual com.jcraft.jsch.Buffer.putString:([B)V
         4: .line 46
            aload 1 /* session */
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.packet:Lcom/jcraft/jsch/Packet;
            invokevirtual com.jcraft.jsch.Session.write:(Lcom/jcraft/jsch/Packet;)V
         5: .line 48
            invokestatic com.jcraft.jsch.JSch.getLogger:()Lcom/jcraft/jsch/Logger;
            iconst_1
            invokeinterface com.jcraft.jsch.Logger.isEnabled:(I)Z
            ifeq 9
         6: .line 49
            invokestatic com.jcraft.jsch.JSch.getLogger:()Lcom/jcraft/jsch/Logger;
            iconst_1
         7: .line 50
            ldc "SSH_MSG_SERVICE_REQUEST sent"
         8: .line 49
            invokeinterface com.jcraft.jsch.Logger.log:(ILjava/lang/String;)V
         9: .line 56
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 1 /* session */
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
            invokevirtual com.jcraft.jsch.Session.read:(Lcom/jcraft/jsch/Buffer;)Lcom/jcraft/jsch/Buffer;
            putfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
        10: .line 57
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
            invokevirtual com.jcraft.jsch.Buffer.getCommand:()B
            istore 2 /* command */
        start local 2 // int command
        11: .line 59
            iload 2 /* command */
            bipush 6
            if_icmpne 12
            iconst_1
            goto 13
      StackMap locals: int
      StackMap stack:
        12: iconst_0
      StackMap locals:
      StackMap stack: int
        13: istore 3 /* result */
        start local 3 // boolean result
        14: .line 61
            invokestatic com.jcraft.jsch.JSch.getLogger:()Lcom/jcraft/jsch/Logger;
            iconst_1
            invokeinterface com.jcraft.jsch.Logger.isEnabled:(I)Z
            ifeq 18
        15: .line 62
            invokestatic com.jcraft.jsch.JSch.getLogger:()Lcom/jcraft/jsch/Logger;
            iconst_1
        16: .line 63
            ldc "SSH_MSG_SERVICE_ACCEPT received"
        17: .line 62
            invokeinterface com.jcraft.jsch.Logger.log:(ILjava/lang/String;)V
        18: .line 65
      StackMap locals: int
      StackMap stack:
            iload 3 /* result */
            ifne 20
        19: .line 66
            iconst_0
            ireturn
        20: .line 68
      StackMap locals:
      StackMap stack:
            aconst_null
            astore 4 /* _username */
        start local 4 // byte[] _username
        21: .line 69
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.username:Ljava/lang/String;
            invokestatic com.jcraft.jsch.Util.str2byte:(Ljava/lang/String;)[B
            astore 4 /* _username */
        22: .line 76
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.packet:Lcom/jcraft/jsch/Packet;
            invokevirtual com.jcraft.jsch.Packet.reset:()V
        23: .line 77
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
            bipush 50
            invokevirtual com.jcraft.jsch.Buffer.putByte:(B)V
        24: .line 78
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
            aload 4 /* _username */
            invokevirtual com.jcraft.jsch.Buffer.putString:([B)V
        25: .line 79
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
            ldc "ssh-connection"
            invokestatic com.jcraft.jsch.Util.str2byte:(Ljava/lang/String;)[B
            invokevirtual com.jcraft.jsch.Buffer.putString:([B)V
        26: .line 80
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
            ldc "none"
            invokestatic com.jcraft.jsch.Util.str2byte:(Ljava/lang/String;)[B
            invokevirtual com.jcraft.jsch.Buffer.putString:([B)V
        27: .line 81
            aload 1 /* session */
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.packet:Lcom/jcraft/jsch/Packet;
            invokevirtual com.jcraft.jsch.Session.write:(Lcom/jcraft/jsch/Packet;)V
        28: .line 85
      StackMap locals: byte[]
      StackMap stack:
            aload 0 /* this */
            aload 1 /* session */
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
            invokevirtual com.jcraft.jsch.Session.read:(Lcom/jcraft/jsch/Buffer;)Lcom/jcraft/jsch/Buffer;
            putfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
        29: .line 86
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
            invokevirtual com.jcraft.jsch.Buffer.getCommand:()B
            sipush 255
            iand
            istore 2 /* command */
        30: .line 88
            iload 2 /* command */
            bipush 52
            if_icmpne 32
        31: .line 89
            iconst_1
            ireturn
        32: .line 91
      StackMap locals:
      StackMap stack:
            iload 2 /* command */
            bipush 53
            if_icmpne 42
        33: .line 92
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
            invokevirtual com.jcraft.jsch.Buffer.getInt:()I
            pop
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
            invokevirtual com.jcraft.jsch.Buffer.getByte:()I
            pop
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
            invokevirtual com.jcraft.jsch.Buffer.getByte:()I
            pop
        34: .line 93
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
            invokevirtual com.jcraft.jsch.Buffer.getString:()[B
            astore 5 /* _message */
        start local 5 // byte[] _message
        35: .line 94
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
            invokevirtual com.jcraft.jsch.Buffer.getString:()[B
            pop
        36: .line 95
            aload 5 /* _message */
            invokestatic com.jcraft.jsch.Util.byte2str:([B)Ljava/lang/String;
            astore 6 /* message */
        start local 6 // java.lang.String message
        37: .line 96
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.userinfo:Lcom/jcraft/jsch/UserInfo;
            ifnull 28
        38: .line 98
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.userinfo:Lcom/jcraft/jsch/UserInfo;
            aload 6 /* message */
            invokeinterface com.jcraft.jsch.UserInfo.showMessage:(Ljava/lang/String;)V
        39: .line 99
            goto 28
        40: .line 100
      StackMap locals: com.jcraft.jsch.UserAuthNone com.jcraft.jsch.Session int int byte[] byte[] java.lang.String
      StackMap stack: java.lang.RuntimeException
            pop
        41: .line 103
            goto 28
        end local 6 // java.lang.String message
        end local 5 // byte[] _message
        42: .line 105
      StackMap locals:
      StackMap stack:
            iload 2 /* command */
            bipush 51
            if_icmpne 48
        43: .line 106
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
            invokevirtual com.jcraft.jsch.Buffer.getInt:()I
            pop
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
            invokevirtual com.jcraft.jsch.Buffer.getByte:()I
            pop
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
            invokevirtual com.jcraft.jsch.Buffer.getByte:()I
            pop
        44: .line 107
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
            invokevirtual com.jcraft.jsch.Buffer.getString:()[B
            astore 5 /* foo */
        start local 5 // byte[] foo
        45: .line 108
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.buf:Lcom/jcraft/jsch/Buffer;
            invokevirtual com.jcraft.jsch.Buffer.getByte:()I
            pop
        46: .line 109
            aload 0 /* this */
            aload 5 /* foo */
            invokestatic com.jcraft.jsch.Util.byte2str:([B)Ljava/lang/String;
            putfield com.jcraft.jsch.UserAuthNone.methods:Ljava/lang/String;
        47: .line 116
            goto 49
        end local 5 // byte[] foo
        48: .line 120
      StackMap locals:
      StackMap stack:
            new com.jcraft.jsch.JSchException
            dup
            new java.lang.StringBuilder
            dup
            ldc "USERAUTH fail ("
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            iload 2 /* command */
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
            ldc ")"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial com.jcraft.jsch.JSchException.<init>:(Ljava/lang/String;)V
            athrow
        49: .line 124
      StackMap locals:
      StackMap stack:
            iconst_0
            ireturn
        end local 4 // byte[] _username
        end local 3 // boolean result
        end local 2 // int command
        end local 1 // com.jcraft.jsch.Session session
        end local 0 // com.jcraft.jsch.UserAuthNone this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0   50     0       this  Lcom/jcraft/jsch/UserAuthNone;
            0   50     1    session  Lcom/jcraft/jsch/Session;
           11   50     2    command  I
           14   50     3     result  Z
           21   50     4  _username  [B
           35   42     5   _message  [B
           37   42     6    message  Ljava/lang/String;
           45   48     5        foo  [B
      Exception table:
        from    to  target  type
          38    39      40  Class java.lang.RuntimeException
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
         Name  Flags
      session  

  java.lang.String getMethods();
    descriptor: ()Ljava/lang/String;
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.jcraft.jsch.UserAuthNone this
         0: .line 127
            aload 0 /* this */
            getfield com.jcraft.jsch.UserAuthNone.methods:Ljava/lang/String;
            areturn
        end local 0 // com.jcraft.jsch.UserAuthNone this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/jcraft/jsch/UserAuthNone;
}
SourceFile: "UserAuthNone.java"