http://www.jcraft.com/jsch/: JSch is a pure Java implementation of SSH2 (JCraft,Inc.) 
public class com.jcraft.jsch.DHEC521 extends com.jcraft.jsch.DHECN
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.jcraft.jsch.DHEC521
  super_class: com.jcraft.jsch.DHECN
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.jcraft.jsch.DHEC521 this
         0: .line 33
            aload 0 /* this */
            invokespecial com.jcraft.jsch.DHECN.<init>:()V
         1: .line 34
            aload 0 /* this */
            ldc "sha-512"
            putfield com.jcraft.jsch.DHEC521.sha_name:Ljava/lang/String;
         2: .line 35
            aload 0 /* this */
            sipush 521
            putfield com.jcraft.jsch.DHEC521.key_size:I
         3: .line 36
            return
        end local 0 // com.jcraft.jsch.DHEC521 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lcom/jcraft/jsch/DHEC521;
}
SourceFile: "DHEC521.java"