http://www.bouncycastle.org/java.html: The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5. 
public class org.bouncycastle.jce.spec.ECPrivateKeySpec extends org.bouncycastle.jce.spec.ECKeySpec
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.bouncycastle.jce.spec.ECPrivateKeySpec
  super_class: org.bouncycastle.jce.spec.ECKeySpec
{
  private java.math.BigInteger d;
    descriptor: Ljava/math/BigInteger;
    flags: (0x0002) ACC_PRIVATE

  public void <init>(java.math.BigInteger, org.bouncycastle.jce.spec.ECParameterSpec);
    descriptor: (Ljava/math/BigInteger;Lorg/bouncycastle/jce/spec/ECParameterSpec;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // org.bouncycastle.jce.spec.ECPrivateKeySpec this
        start local 1 // java.math.BigInteger d
        start local 2 // org.bouncycastle.jce.spec.ECParameterSpec spec
         0: .line 23
            aload 0 /* this */
            aload 2 /* spec */
            invokespecial org.bouncycastle.jce.spec.ECKeySpec.<init>:(Lorg/bouncycastle/jce/spec/ECParameterSpec;)V
         1: .line 25
            aload 0 /* this */
            aload 1 /* d */
            putfield org.bouncycastle.jce.spec.ECPrivateKeySpec.d:Ljava/math/BigInteger;
         2: .line 26
            return
        end local 2 // org.bouncycastle.jce.spec.ECParameterSpec spec
        end local 1 // java.math.BigInteger d
        end local 0 // org.bouncycastle.jce.spec.ECPrivateKeySpec this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/bouncycastle/jce/spec/ECPrivateKeySpec;
            0    3     1     d  Ljava/math/BigInteger;
            0    3     2  spec  Lorg/bouncycastle/jce/spec/ECParameterSpec;
    MethodParameters:
      Name  Flags
      d     
      spec  

  public java.math.BigInteger getD();
    descriptor: ()Ljava/math/BigInteger;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.jce.spec.ECPrivateKeySpec this
         0: .line 33
            aload 0 /* this */
            getfield org.bouncycastle.jce.spec.ECPrivateKeySpec.d:Ljava/math/BigInteger;
            areturn
        end local 0 // org.bouncycastle.jce.spec.ECPrivateKeySpec this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/jce/spec/ECPrivateKeySpec;
}
SourceFile: "ECPrivateKeySpec.java"