http://www.jcraft.com/jsch/: JSch is a pure Java implementation of SSH2 (JCraft,Inc.) 
public class com.jcraft.jsch.jce.SignatureECDSA521 extends com.jcraft.jsch.jce.SignatureECDSAN
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.jcraft.jsch.jce.SignatureECDSA521
  super_class: com.jcraft.jsch.jce.SignatureECDSAN
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.jcraft.jsch.jce.SignatureECDSA521 this
         0: .line 37
            aload 0 /* this */
            invokespecial com.jcraft.jsch.jce.SignatureECDSAN.<init>:()V
            return
        end local 0 // com.jcraft.jsch.jce.SignatureECDSA521 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/jcraft/jsch/jce/SignatureECDSA521;

  java.lang.String getName();
    descriptor: ()Ljava/lang/String;
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.jcraft.jsch.jce.SignatureECDSA521 this
         0: .line 39
            ldc "ecdsa-sha2-nistp521"
            areturn
        end local 0 // com.jcraft.jsch.jce.SignatureECDSA521 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/jcraft/jsch/jce/SignatureECDSA521;
}
SourceFile: "SignatureECDSA521.java"