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.crmf.POPOPrivKey extends org.bouncycastle.asn1.ASN1Encodable implements org.bouncycastle.asn1.ASN1Choice
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.bouncycastle.asn1.crmf.POPOPrivKey
  super_class: org.bouncycastle.asn1.ASN1Encodable
{
  public static final int thisMessage;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 0

  public static final int subsequentMessage;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 1

  public static final int dhMAC;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 2

  public static final int agreeMAC;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 3

  public static final int encryptedKey;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 4

  private int tagNo;
    descriptor: I
    flags: (0x0002) ACC_PRIVATE

  private org.bouncycastle.asn1.ASN1Encodable obj;
    descriptor: Lorg/bouncycastle/asn1/ASN1Encodable;
    flags: (0x0002) ACC_PRIVATE

  private void <init>(org.bouncycastle.asn1.ASN1TaggedObject);
    descriptor: (Lorg/bouncycastle/asn1/ASN1TaggedObject;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.bouncycastle.asn1.crmf.POPOPrivKey this
        start local 1 // org.bouncycastle.asn1.ASN1TaggedObject obj
         0: .line 25
            aload 0 /* this */
            invokespecial org.bouncycastle.asn1.ASN1Encodable.<init>:()V
         1: .line 27
            aload 0 /* this */
            aload 1 /* obj */
            invokevirtual org.bouncycastle.asn1.ASN1TaggedObject.getTagNo:()I
            putfield org.bouncycastle.asn1.crmf.POPOPrivKey.tagNo:I
         2: .line 29
            aload 0 /* this */
            getfield org.bouncycastle.asn1.crmf.POPOPrivKey.tagNo:I
            tableswitch { // 0 - 4
                    0: 3
                    1: 5
                    2: 7
                    3: 9
                    4: 11
              default: 13
          }
         3: .line 32
      StackMap locals: org.bouncycastle.asn1.crmf.POPOPrivKey org.bouncycastle.asn1.ASN1TaggedObject
      StackMap stack:
            aload 0 /* this */
            aload 1 /* obj */
            iconst_0
            invokestatic org.bouncycastle.asn1.DERBitString.getInstance:(Lorg/bouncycastle/asn1/ASN1TaggedObject;Z)Lorg/bouncycastle/asn1/DERBitString;
            putfield org.bouncycastle.asn1.crmf.POPOPrivKey.obj:Lorg/bouncycastle/asn1/ASN1Encodable;
         4: .line 33
            goto 14
         5: .line 35
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 1 /* obj */
            iconst_0
            invokestatic org.bouncycastle.asn1.DERInteger.getInstance:(Lorg/bouncycastle/asn1/ASN1TaggedObject;Z)Lorg/bouncycastle/asn1/DERInteger;
            invokevirtual org.bouncycastle.asn1.DERInteger.getValue:()Ljava/math/BigInteger;
            invokevirtual java.math.BigInteger.intValue:()I
            invokestatic org.bouncycastle.asn1.crmf.SubsequentMessage.valueOf:(I)Lorg/bouncycastle/asn1/crmf/SubsequentMessage;
            putfield org.bouncycastle.asn1.crmf.POPOPrivKey.obj:Lorg/bouncycastle/asn1/ASN1Encodable;
         6: .line 36
            goto 14
         7: .line 38
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 1 /* obj */
            iconst_0
            invokestatic org.bouncycastle.asn1.DERBitString.getInstance:(Lorg/bouncycastle/asn1/ASN1TaggedObject;Z)Lorg/bouncycastle/asn1/DERBitString;
            putfield org.bouncycastle.asn1.crmf.POPOPrivKey.obj:Lorg/bouncycastle/asn1/ASN1Encodable;
         8: .line 39
            goto 14
         9: .line 41
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 1 /* obj */
            iconst_0
            invokestatic org.bouncycastle.asn1.crmf.PKMACValue.getInstance:(Lorg/bouncycastle/asn1/ASN1TaggedObject;Z)Lorg/bouncycastle/asn1/crmf/PKMACValue;
            putfield org.bouncycastle.asn1.crmf.POPOPrivKey.obj:Lorg/bouncycastle/asn1/ASN1Encodable;
        10: .line 42
            goto 14
        11: .line 44
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 1 /* obj */
            iconst_0
            invokestatic org.bouncycastle.asn1.cms.EnvelopedData.getInstance:(Lorg/bouncycastle/asn1/ASN1TaggedObject;Z)Lorg/bouncycastle/asn1/cms/EnvelopedData;
            putfield org.bouncycastle.asn1.crmf.POPOPrivKey.obj:Lorg/bouncycastle/asn1/ASN1Encodable;
        12: .line 45
            goto 14
        13: .line 47
      StackMap locals:
      StackMap stack:
            new java.lang.IllegalArgumentException
            dup
            ldc "unknown tag in POPOPrivKey"
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
        14: .line 49
      StackMap locals:
      StackMap stack:
            return
        end local 1 // org.bouncycastle.asn1.ASN1TaggedObject obj
        end local 0 // org.bouncycastle.asn1.crmf.POPOPrivKey this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0   15     0  this  Lorg/bouncycastle/asn1/crmf/POPOPrivKey;
            0   15     1   obj  Lorg/bouncycastle/asn1/ASN1TaggedObject;
    MethodParameters:
      Name  Flags
      obj   

  public static org.bouncycastle.asn1.crmf.POPOPrivKey getInstance(org.bouncycastle.asn1.ASN1TaggedObject, boolean);
    descriptor: (Lorg/bouncycastle/asn1/ASN1TaggedObject;Z)Lorg/bouncycastle/asn1/crmf/POPOPrivKey;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.bouncycastle.asn1.ASN1TaggedObject tagged
        start local 1 // boolean isExplicit
         0: .line 53
            new org.bouncycastle.asn1.crmf.POPOPrivKey
            dup
            aload 0 /* tagged */
            invokevirtual org.bouncycastle.asn1.ASN1TaggedObject.getObject:()Lorg/bouncycastle/asn1/DERObject;
            invokestatic org.bouncycastle.asn1.ASN1TaggedObject.getInstance:(Ljava/lang/Object;)Lorg/bouncycastle/asn1/ASN1TaggedObject;
            invokespecial org.bouncycastle.asn1.crmf.POPOPrivKey.<init>:(Lorg/bouncycastle/asn1/ASN1TaggedObject;)V
            areturn
        end local 1 // boolean isExplicit
        end local 0 // org.bouncycastle.asn1.ASN1TaggedObject tagged
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    1     0      tagged  Lorg/bouncycastle/asn1/ASN1TaggedObject;
            0    1     1  isExplicit  Z
    MethodParameters:
            Name  Flags
      tagged      
      isExplicit  

  public void <init>(org.bouncycastle.asn1.crmf.SubsequentMessage);
    descriptor: (Lorg/bouncycastle/asn1/crmf/SubsequentMessage;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.bouncycastle.asn1.crmf.POPOPrivKey this
        start local 1 // org.bouncycastle.asn1.crmf.SubsequentMessage msg
         0: .line 56
            aload 0 /* this */
            invokespecial org.bouncycastle.asn1.ASN1Encodable.<init>:()V
         1: .line 58
            aload 0 /* this */
            iconst_1
            putfield org.bouncycastle.asn1.crmf.POPOPrivKey.tagNo:I
         2: .line 59
            aload 0 /* this */
            aload 1 /* msg */
            putfield org.bouncycastle.asn1.crmf.POPOPrivKey.obj:Lorg/bouncycastle/asn1/ASN1Encodable;
         3: .line 60
            return
        end local 1 // org.bouncycastle.asn1.crmf.SubsequentMessage msg
        end local 0 // org.bouncycastle.asn1.crmf.POPOPrivKey this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lorg/bouncycastle/asn1/crmf/POPOPrivKey;
            0    4     1   msg  Lorg/bouncycastle/asn1/crmf/SubsequentMessage;
    MethodParameters:
      Name  Flags
      msg   

  public int getType();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.asn1.crmf.POPOPrivKey this
         0: .line 64
            aload 0 /* this */
            getfield org.bouncycastle.asn1.crmf.POPOPrivKey.tagNo:I
            ireturn
        end local 0 // org.bouncycastle.asn1.crmf.POPOPrivKey this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/asn1/crmf/POPOPrivKey;

  public org.bouncycastle.asn1.ASN1Encodable getValue();
    descriptor: ()Lorg/bouncycastle/asn1/ASN1Encodable;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.asn1.crmf.POPOPrivKey this
         0: .line 69
            aload 0 /* this */
            getfield org.bouncycastle.asn1.crmf.POPOPrivKey.obj:Lorg/bouncycastle/asn1/ASN1Encodable;
            areturn
        end local 0 // org.bouncycastle.asn1.crmf.POPOPrivKey this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/asn1/crmf/POPOPrivKey;

  public org.bouncycastle.asn1.DERObject toASN1Object();
    descriptor: ()Lorg/bouncycastle/asn1/DERObject;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=1, args_size=1
        start local 0 // org.bouncycastle.asn1.crmf.POPOPrivKey this
         0: .line 87
            new org.bouncycastle.asn1.DERTaggedObject
            dup
            iconst_0
            aload 0 /* this */
            getfield org.bouncycastle.asn1.crmf.POPOPrivKey.tagNo:I
            aload 0 /* this */
            getfield org.bouncycastle.asn1.crmf.POPOPrivKey.obj:Lorg/bouncycastle/asn1/ASN1Encodable;
            invokespecial org.bouncycastle.asn1.DERTaggedObject.<init>:(ZILorg/bouncycastle/asn1/DEREncodable;)V
            areturn
        end local 0 // org.bouncycastle.asn1.crmf.POPOPrivKey this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/asn1/crmf/POPOPrivKey;
}
SourceFile: "POPOPrivKey.java"