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.asn1.sec.ECPrivateKeyStructure extends org.bouncycastle.asn1.ASN1Encodable
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.bouncycastle.asn1.sec.ECPrivateKeyStructure
  super_class: org.bouncycastle.asn1.ASN1Encodable
{
  private org.bouncycastle.asn1.ASN1Sequence seq;
    descriptor: Lorg/bouncycastle/asn1/ASN1Sequence;
    flags: (0x0002) ACC_PRIVATE

  public void <init>(org.bouncycastle.asn1.ASN1Sequence);
    descriptor: (Lorg/bouncycastle/asn1/ASN1Sequence;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.bouncycastle.asn1.sec.ECPrivateKeyStructure this
        start local 1 // org.bouncycastle.asn1.ASN1Sequence seq
         0: .line 29
            aload 0 /* this */
            invokespecial org.bouncycastle.asn1.ASN1Encodable.<init>:()V
         1: .line 32
            aload 0 /* this */
            aload 1 /* seq */
            putfield org.bouncycastle.asn1.sec.ECPrivateKeyStructure.seq:Lorg/bouncycastle/asn1/ASN1Sequence;
         2: .line 33
            return
        end local 1 // org.bouncycastle.asn1.ASN1Sequence seq
        end local 0 // org.bouncycastle.asn1.sec.ECPrivateKeyStructure this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/bouncycastle/asn1/sec/ECPrivateKeyStructure;
            0    3     1   seq  Lorg/bouncycastle/asn1/ASN1Sequence;
    MethodParameters:
      Name  Flags
      seq   

  public void <init>(java.math.BigInteger);
    descriptor: (Ljava/math/BigInteger;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=4, args_size=2
        start local 0 // org.bouncycastle.asn1.sec.ECPrivateKeyStructure this
        start local 1 // java.math.BigInteger key
         0: .line 35
            aload 0 /* this */
            invokespecial org.bouncycastle.asn1.ASN1Encodable.<init>:()V
         1: .line 38
            aload 1 /* key */
            invokestatic org.bouncycastle.util.BigIntegers.asUnsignedByteArray:(Ljava/math/BigInteger;)[B
            astore 2 /* bytes */
        start local 2 // byte[] bytes
         2: .line 40
            new org.bouncycastle.asn1.ASN1EncodableVector
            dup
            invokespecial org.bouncycastle.asn1.ASN1EncodableVector.<init>:()V
            astore 3 /* v */
        start local 3 // org.bouncycastle.asn1.ASN1EncodableVector v
         3: .line 42
            aload 3 /* v */
            new org.bouncycastle.asn1.DERInteger
            dup
            iconst_1
            invokespecial org.bouncycastle.asn1.DERInteger.<init>:(I)V
            invokevirtual org.bouncycastle.asn1.ASN1EncodableVector.add:(Lorg/bouncycastle/asn1/DEREncodable;)V
         4: .line 43
            aload 3 /* v */
            new org.bouncycastle.asn1.DEROctetString
            dup
            aload 2 /* bytes */
            invokespecial org.bouncycastle.asn1.DEROctetString.<init>:([B)V
            invokevirtual org.bouncycastle.asn1.ASN1EncodableVector.add:(Lorg/bouncycastle/asn1/DEREncodable;)V
         5: .line 45
            aload 0 /* this */
            new org.bouncycastle.asn1.DERSequence
            dup
            aload 3 /* v */
            invokespecial org.bouncycastle.asn1.DERSequence.<init>:(Lorg/bouncycastle/asn1/ASN1EncodableVector;)V
            putfield org.bouncycastle.asn1.sec.ECPrivateKeyStructure.seq:Lorg/bouncycastle/asn1/ASN1Sequence;
         6: .line 46
            return
        end local 3 // org.bouncycastle.asn1.ASN1EncodableVector v
        end local 2 // byte[] bytes
        end local 1 // java.math.BigInteger key
        end local 0 // org.bouncycastle.asn1.sec.ECPrivateKeyStructure this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    7     0   this  Lorg/bouncycastle/asn1/sec/ECPrivateKeyStructure;
            0    7     1    key  Ljava/math/BigInteger;
            2    7     2  bytes  [B
            3    7     3      v  Lorg/bouncycastle/asn1/ASN1EncodableVector;
    MethodParameters:
      Name  Flags
      key   

  public void <init>(java.math.BigInteger, org.bouncycastle.asn1.ASN1Encodable);
    descriptor: (Ljava/math/BigInteger;Lorg/bouncycastle/asn1/ASN1Encodable;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=3, args_size=3
        start local 0 // org.bouncycastle.asn1.sec.ECPrivateKeyStructure this
        start local 1 // java.math.BigInteger key
        start local 2 // org.bouncycastle.asn1.ASN1Encodable parameters
         0: .line 52
            aload 0 /* this */
            aload 1 /* key */
            aconst_null
            aload 2 /* parameters */
            invokespecial org.bouncycastle.asn1.sec.ECPrivateKeyStructure.<init>:(Ljava/math/BigInteger;Lorg/bouncycastle/asn1/DERBitString;Lorg/bouncycastle/asn1/ASN1Encodable;)V
         1: .line 53
            return
        end local 2 // org.bouncycastle.asn1.ASN1Encodable parameters
        end local 1 // java.math.BigInteger key
        end local 0 // org.bouncycastle.asn1.sec.ECPrivateKeyStructure this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    2     0        this  Lorg/bouncycastle/asn1/sec/ECPrivateKeyStructure;
            0    2     1         key  Ljava/math/BigInteger;
            0    2     2  parameters  Lorg/bouncycastle/asn1/ASN1Encodable;
    MethodParameters:
            Name  Flags
      key         
      parameters  

  public void <init>(java.math.BigInteger, org.bouncycastle.asn1.DERBitString, org.bouncycastle.asn1.ASN1Encodable);
    descriptor: (Ljava/math/BigInteger;Lorg/bouncycastle/asn1/DERBitString;Lorg/bouncycastle/asn1/ASN1Encodable;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=6, locals=6, args_size=4
        start local 0 // org.bouncycastle.asn1.sec.ECPrivateKeyStructure this
        start local 1 // java.math.BigInteger key
        start local 2 // org.bouncycastle.asn1.DERBitString publicKey
        start local 3 // org.bouncycastle.asn1.ASN1Encodable parameters
         0: .line 55
            aload 0 /* this */
            invokespecial org.bouncycastle.asn1.ASN1Encodable.<init>:()V
         1: .line 60
            aload 1 /* key */
            invokestatic org.bouncycastle.util.BigIntegers.asUnsignedByteArray:(Ljava/math/BigInteger;)[B
            astore 4 /* bytes */
        start local 4 // byte[] bytes
         2: .line 62
            new org.bouncycastle.asn1.ASN1EncodableVector
            dup
            invokespecial org.bouncycastle.asn1.ASN1EncodableVector.<init>:()V
            astore 5 /* v */
        start local 5 // org.bouncycastle.asn1.ASN1EncodableVector v
         3: .line 64
            aload 5 /* v */
            new org.bouncycastle.asn1.DERInteger
            dup
            iconst_1
            invokespecial org.bouncycastle.asn1.DERInteger.<init>:(I)V
            invokevirtual org.bouncycastle.asn1.ASN1EncodableVector.add:(Lorg/bouncycastle/asn1/DEREncodable;)V
         4: .line 65
            aload 5 /* v */
            new org.bouncycastle.asn1.DEROctetString
            dup
            aload 4 /* bytes */
            invokespecial org.bouncycastle.asn1.DEROctetString.<init>:([B)V
            invokevirtual org.bouncycastle.asn1.ASN1EncodableVector.add:(Lorg/bouncycastle/asn1/DEREncodable;)V
         5: .line 67
            aload 3 /* parameters */
            ifnull 7
         6: .line 69
            aload 5 /* v */
            new org.bouncycastle.asn1.DERTaggedObject
            dup
            iconst_1
            iconst_0
            aload 3 /* parameters */
            invokespecial org.bouncycastle.asn1.DERTaggedObject.<init>:(ZILorg/bouncycastle/asn1/DEREncodable;)V
            invokevirtual org.bouncycastle.asn1.ASN1EncodableVector.add:(Lorg/bouncycastle/asn1/DEREncodable;)V
         7: .line 72
      StackMap locals: org.bouncycastle.asn1.sec.ECPrivateKeyStructure java.math.BigInteger org.bouncycastle.asn1.DERBitString org.bouncycastle.asn1.ASN1Encodable byte[] org.bouncycastle.asn1.ASN1EncodableVector
      StackMap stack:
            aload 2 /* publicKey */
            ifnull 9
         8: .line 74
            aload 5 /* v */
            new org.bouncycastle.asn1.DERTaggedObject
            dup
            iconst_1
            iconst_1
            aload 2 /* publicKey */
            invokespecial org.bouncycastle.asn1.DERTaggedObject.<init>:(ZILorg/bouncycastle/asn1/DEREncodable;)V
            invokevirtual org.bouncycastle.asn1.ASN1EncodableVector.add:(Lorg/bouncycastle/asn1/DEREncodable;)V
         9: .line 77
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            new org.bouncycastle.asn1.DERSequence
            dup
            aload 5 /* v */
            invokespecial org.bouncycastle.asn1.DERSequence.<init>:(Lorg/bouncycastle/asn1/ASN1EncodableVector;)V
            putfield org.bouncycastle.asn1.sec.ECPrivateKeyStructure.seq:Lorg/bouncycastle/asn1/ASN1Sequence;
        10: .line 78
            return
        end local 5 // org.bouncycastle.asn1.ASN1EncodableVector v
        end local 4 // byte[] bytes
        end local 3 // org.bouncycastle.asn1.ASN1Encodable parameters
        end local 2 // org.bouncycastle.asn1.DERBitString publicKey
        end local 1 // java.math.BigInteger key
        end local 0 // org.bouncycastle.asn1.sec.ECPrivateKeyStructure this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0   11     0        this  Lorg/bouncycastle/asn1/sec/ECPrivateKeyStructure;
            0   11     1         key  Ljava/math/BigInteger;
            0   11     2   publicKey  Lorg/bouncycastle/asn1/DERBitString;
            0   11     3  parameters  Lorg/bouncycastle/asn1/ASN1Encodable;
            2   11     4       bytes  [B
            3   11     5           v  Lorg/bouncycastle/asn1/ASN1EncodableVector;
    MethodParameters:
            Name  Flags
      key         
      publicKey   
      parameters  

  public java.math.BigInteger getKey();
    descriptor: ()Ljava/math/BigInteger;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=2, args_size=1
        start local 0 // org.bouncycastle.asn1.sec.ECPrivateKeyStructure this
         0: .line 82
            aload 0 /* this */
            getfield org.bouncycastle.asn1.sec.ECPrivateKeyStructure.seq:Lorg/bouncycastle/asn1/ASN1Sequence;
            iconst_1
            invokevirtual org.bouncycastle.asn1.ASN1Sequence.getObjectAt:(I)Lorg/bouncycastle/asn1/DEREncodable;
            checkcast org.bouncycastle.asn1.ASN1OctetString
            astore 1 /* octs */
        start local 1 // org.bouncycastle.asn1.ASN1OctetString octs
         1: .line 84
            new java.math.BigInteger
            dup
            iconst_1
            aload 1 /* octs */
            invokevirtual org.bouncycastle.asn1.ASN1OctetString.getOctets:()[B
            invokespecial java.math.BigInteger.<init>:(I[B)V
            areturn
        end local 1 // org.bouncycastle.asn1.ASN1OctetString octs
        end local 0 // org.bouncycastle.asn1.sec.ECPrivateKeyStructure this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/bouncycastle/asn1/sec/ECPrivateKeyStructure;
            1    2     1  octs  Lorg/bouncycastle/asn1/ASN1OctetString;

  public org.bouncycastle.asn1.DERBitString getPublicKey();
    descriptor: ()Lorg/bouncycastle/asn1/DERBitString;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.bouncycastle.asn1.sec.ECPrivateKeyStructure this
         0: .line 89
            aload 0 /* this */
            iconst_1
            invokevirtual org.bouncycastle.asn1.sec.ECPrivateKeyStructure.getObjectInTag:(I)Lorg/bouncycastle/asn1/ASN1Object;
            checkcast org.bouncycastle.asn1.DERBitString
            areturn
        end local 0 // org.bouncycastle.asn1.sec.ECPrivateKeyStructure this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/asn1/sec/ECPrivateKeyStructure;

  public org.bouncycastle.asn1.ASN1Object getParameters();
    descriptor: ()Lorg/bouncycastle/asn1/ASN1Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.bouncycastle.asn1.sec.ECPrivateKeyStructure this
         0: .line 94
            aload 0 /* this */
            iconst_0
            invokevirtual org.bouncycastle.asn1.sec.ECPrivateKeyStructure.getObjectInTag:(I)Lorg/bouncycastle/asn1/ASN1Object;
            areturn
        end local 0 // org.bouncycastle.asn1.sec.ECPrivateKeyStructure this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/asn1/sec/ECPrivateKeyStructure;

  private org.bouncycastle.asn1.ASN1Object getObjectInTag(int);
    descriptor: (I)Lorg/bouncycastle/asn1/ASN1Object;
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=5, args_size=2
        start local 0 // org.bouncycastle.asn1.sec.ECPrivateKeyStructure this
        start local 1 // int tagNo
         0: .line 99
            aload 0 /* this */
            getfield org.bouncycastle.asn1.sec.ECPrivateKeyStructure.seq:Lorg/bouncycastle/asn1/ASN1Sequence;
            invokevirtual org.bouncycastle.asn1.ASN1Sequence.getObjects:()Ljava/util/Enumeration;
            astore 2 /* e */
        start local 2 // java.util.Enumeration e
         1: .line 101
            goto 7
         2: .line 103
      StackMap locals: java.util.Enumeration
      StackMap stack:
            aload 2 /* e */
            invokeinterface java.util.Enumeration.nextElement:()Ljava/lang/Object;
            checkcast org.bouncycastle.asn1.DEREncodable
            astore 3 /* obj */
        start local 3 // org.bouncycastle.asn1.DEREncodable obj
         3: .line 105
            aload 3 /* obj */
            instanceof org.bouncycastle.asn1.ASN1TaggedObject
            ifeq 7
         4: .line 107
            aload 3 /* obj */
            checkcast org.bouncycastle.asn1.ASN1TaggedObject
            astore 4 /* tag */
        start local 4 // org.bouncycastle.asn1.ASN1TaggedObject tag
         5: .line 108
            aload 4 /* tag */
            invokevirtual org.bouncycastle.asn1.ASN1TaggedObject.getTagNo:()I
            iload 1 /* tagNo */
            if_icmpne 7
         6: .line 110
            aload 4 /* tag */
            invokevirtual org.bouncycastle.asn1.ASN1TaggedObject.getObject:()Lorg/bouncycastle/asn1/DERObject;
            invokeinterface org.bouncycastle.asn1.DEREncodable.getDERObject:()Lorg/bouncycastle/asn1/DERObject;
            checkcast org.bouncycastle.asn1.ASN1Object
            areturn
        end local 4 // org.bouncycastle.asn1.ASN1TaggedObject tag
        end local 3 // org.bouncycastle.asn1.DEREncodable obj
         7: .line 101
      StackMap locals:
      StackMap stack:
            aload 2 /* e */
            invokeinterface java.util.Enumeration.hasMoreElements:()Z
            ifne 2
         8: .line 114
            aconst_null
            areturn
        end local 2 // java.util.Enumeration e
        end local 1 // int tagNo
        end local 0 // org.bouncycastle.asn1.sec.ECPrivateKeyStructure this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    9     0   this  Lorg/bouncycastle/asn1/sec/ECPrivateKeyStructure;
            0    9     1  tagNo  I
            1    9     2      e  Ljava/util/Enumeration;
            3    7     3    obj  Lorg/bouncycastle/asn1/DEREncodable;
            5    7     4    tag  Lorg/bouncycastle/asn1/ASN1TaggedObject;
    MethodParameters:
       Name  Flags
      tagNo  

  public org.bouncycastle.asn1.DERObject toASN1Object();
    descriptor: ()Lorg/bouncycastle/asn1/DERObject;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.asn1.sec.ECPrivateKeyStructure this
         0: .line 126
            aload 0 /* this */
            getfield org.bouncycastle.asn1.sec.ECPrivateKeyStructure.seq:Lorg/bouncycastle/asn1/ASN1Sequence;
            areturn
        end local 0 // org.bouncycastle.asn1.sec.ECPrivateKeyStructure this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/asn1/sec/ECPrivateKeyStructure;
}
SourceFile: "ECPrivateKeyStructure.java"