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.x509.CertificatePair extends org.bouncycastle.asn1.ASN1Encodable
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.bouncycastle.asn1.x509.CertificatePair
  super_class: org.bouncycastle.asn1.ASN1Encodable
{
  private org.bouncycastle.asn1.x509.X509CertificateStructure forward;
    descriptor: Lorg/bouncycastle/asn1/x509/X509CertificateStructure;
    flags: (0x0002) ACC_PRIVATE

  private org.bouncycastle.asn1.x509.X509CertificateStructure reverse;
    descriptor: Lorg/bouncycastle/asn1/x509/X509CertificateStructure;
    flags: (0x0002) ACC_PRIVATE

  public static org.bouncycastle.asn1.x509.CertificatePair getInstance(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Lorg/bouncycastle/asn1/x509/CertificatePair;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=5, locals=1, args_size=1
        start local 0 // java.lang.Object obj
         0: .line 55
            aload 0 /* obj */
            ifnull 1
            aload 0 /* obj */
            instanceof org.bouncycastle.asn1.x509.CertificatePair
            ifeq 2
         1: .line 57
      StackMap locals:
      StackMap stack:
            aload 0 /* obj */
            checkcast org.bouncycastle.asn1.x509.CertificatePair
            areturn
         2: .line 60
      StackMap locals:
      StackMap stack:
            aload 0 /* obj */
            instanceof org.bouncycastle.asn1.ASN1Sequence
            ifeq 4
         3: .line 62
            new org.bouncycastle.asn1.x509.CertificatePair
            dup
            aload 0 /* obj */
            checkcast org.bouncycastle.asn1.ASN1Sequence
            invokespecial org.bouncycastle.asn1.x509.CertificatePair.<init>:(Lorg/bouncycastle/asn1/ASN1Sequence;)V
            areturn
         4: .line 65
      StackMap locals:
      StackMap stack:
            new java.lang.IllegalArgumentException
            dup
            new java.lang.StringBuilder
            dup
            ldc "illegal object in getInstance: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
         5: .line 66
            aload 0 /* obj */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
         6: .line 65
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
        end local 0 // java.lang.Object obj
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    7     0   obj  Ljava/lang/Object;
    MethodParameters:
      Name  Flags
      obj   

  private void <init>(org.bouncycastle.asn1.ASN1Sequence);
    descriptor: (Lorg/bouncycastle/asn1/ASN1Sequence;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=5, locals=4, args_size=2
        start local 0 // org.bouncycastle.asn1.x509.CertificatePair this
        start local 1 // org.bouncycastle.asn1.ASN1Sequence seq
         0: .line 83
            aload 0 /* this */
            invokespecial org.bouncycastle.asn1.ASN1Encodable.<init>:()V
         1: .line 85
            aload 1 /* seq */
            invokevirtual org.bouncycastle.asn1.ASN1Sequence.size:()I
            iconst_1
            if_icmpeq 5
            aload 1 /* seq */
            invokevirtual org.bouncycastle.asn1.ASN1Sequence.size:()I
            iconst_2
            if_icmpeq 5
         2: .line 87
            new java.lang.IllegalArgumentException
            dup
            new java.lang.StringBuilder
            dup
            ldc "Bad sequence size: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
         3: .line 88
            aload 1 /* seq */
            invokevirtual org.bouncycastle.asn1.ASN1Sequence.size:()I
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
         4: .line 87
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         5: .line 91
      StackMap locals: org.bouncycastle.asn1.x509.CertificatePair org.bouncycastle.asn1.ASN1Sequence
      StackMap stack:
            aload 1 /* seq */
            invokevirtual org.bouncycastle.asn1.ASN1Sequence.getObjects:()Ljava/util/Enumeration;
            astore 2 /* e */
        start local 2 // java.util.Enumeration e
         6: .line 93
            goto 17
         7: .line 95
      StackMap locals: java.util.Enumeration
      StackMap stack:
            aload 2 /* e */
            invokeinterface java.util.Enumeration.nextElement:()Ljava/lang/Object;
            invokestatic org.bouncycastle.asn1.ASN1TaggedObject.getInstance:(Ljava/lang/Object;)Lorg/bouncycastle/asn1/ASN1TaggedObject;
            astore 3 /* o */
        start local 3 // org.bouncycastle.asn1.ASN1TaggedObject o
         8: .line 96
            aload 3 /* o */
            invokevirtual org.bouncycastle.asn1.ASN1TaggedObject.getTagNo:()I
            ifne 11
         9: .line 98
            aload 0 /* this */
            aload 3 /* o */
            iconst_1
            invokestatic org.bouncycastle.asn1.x509.X509CertificateStructure.getInstance:(Lorg/bouncycastle/asn1/ASN1TaggedObject;Z)Lorg/bouncycastle/asn1/x509/X509CertificateStructure;
            putfield org.bouncycastle.asn1.x509.CertificatePair.forward:Lorg/bouncycastle/asn1/x509/X509CertificateStructure;
        10: .line 99
            goto 17
        11: .line 100
      StackMap locals: org.bouncycastle.asn1.ASN1TaggedObject
      StackMap stack:
            aload 3 /* o */
            invokevirtual org.bouncycastle.asn1.ASN1TaggedObject.getTagNo:()I
            iconst_1
            if_icmpne 14
        12: .line 102
            aload 0 /* this */
            aload 3 /* o */
            iconst_1
            invokestatic org.bouncycastle.asn1.x509.X509CertificateStructure.getInstance:(Lorg/bouncycastle/asn1/ASN1TaggedObject;Z)Lorg/bouncycastle/asn1/x509/X509CertificateStructure;
            putfield org.bouncycastle.asn1.x509.CertificatePair.reverse:Lorg/bouncycastle/asn1/x509/X509CertificateStructure;
        13: .line 103
            goto 17
        14: .line 106
      StackMap locals:
      StackMap stack:
            new java.lang.IllegalArgumentException
            dup
            new java.lang.StringBuilder
            dup
            ldc "Bad tag number: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
        15: .line 107
            aload 3 /* o */
            invokevirtual org.bouncycastle.asn1.ASN1TaggedObject.getTagNo:()I
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
        16: .line 106
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
        end local 3 // org.bouncycastle.asn1.ASN1TaggedObject o
        17: .line 93
      StackMap locals:
      StackMap stack:
            aload 2 /* e */
            invokeinterface java.util.Enumeration.hasMoreElements:()Z
            ifne 7
        18: .line 110
            return
        end local 2 // java.util.Enumeration e
        end local 1 // org.bouncycastle.asn1.ASN1Sequence seq
        end local 0 // org.bouncycastle.asn1.x509.CertificatePair this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0   19     0  this  Lorg/bouncycastle/asn1/x509/CertificatePair;
            0   19     1   seq  Lorg/bouncycastle/asn1/ASN1Sequence;
            6   19     2     e  Ljava/util/Enumeration;
            8   17     3     o  Lorg/bouncycastle/asn1/ASN1TaggedObject;
    MethodParameters:
      Name  Flags
      seq   

  public void <init>(org.bouncycastle.asn1.x509.X509CertificateStructure, org.bouncycastle.asn1.x509.X509CertificateStructure);
    descriptor: (Lorg/bouncycastle/asn1/x509/X509CertificateStructure;Lorg/bouncycastle/asn1/x509/X509CertificateStructure;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // org.bouncycastle.asn1.x509.CertificatePair this
        start local 1 // org.bouncycastle.asn1.x509.X509CertificateStructure forward
        start local 2 // org.bouncycastle.asn1.x509.X509CertificateStructure reverse
         0: .line 118
            aload 0 /* this */
            invokespecial org.bouncycastle.asn1.ASN1Encodable.<init>:()V
         1: .line 120
            aload 0 /* this */
            aload 1 /* forward */
            putfield org.bouncycastle.asn1.x509.CertificatePair.forward:Lorg/bouncycastle/asn1/x509/X509CertificateStructure;
         2: .line 121
            aload 0 /* this */
            aload 2 /* reverse */
            putfield org.bouncycastle.asn1.x509.CertificatePair.reverse:Lorg/bouncycastle/asn1/x509/X509CertificateStructure;
         3: .line 122
            return
        end local 2 // org.bouncycastle.asn1.x509.X509CertificateStructure reverse
        end local 1 // org.bouncycastle.asn1.x509.X509CertificateStructure forward
        end local 0 // org.bouncycastle.asn1.x509.CertificatePair this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    4     0     this  Lorg/bouncycastle/asn1/x509/CertificatePair;
            0    4     1  forward  Lorg/bouncycastle/asn1/x509/X509CertificateStructure;
            0    4     2  reverse  Lorg/bouncycastle/asn1/x509/X509CertificateStructure;
    MethodParameters:
         Name  Flags
      forward  
      reverse  

  public org.bouncycastle.asn1.DERObject toASN1Object();
    descriptor: ()Lorg/bouncycastle/asn1/DERObject;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=2, args_size=1
        start local 0 // org.bouncycastle.asn1.x509.CertificatePair this
         0: .line 140
            new org.bouncycastle.asn1.ASN1EncodableVector
            dup
            invokespecial org.bouncycastle.asn1.ASN1EncodableVector.<init>:()V
            astore 1 /* vec */
        start local 1 // org.bouncycastle.asn1.ASN1EncodableVector vec
         1: .line 142
            aload 0 /* this */
            getfield org.bouncycastle.asn1.x509.CertificatePair.forward:Lorg/bouncycastle/asn1/x509/X509CertificateStructure;
            ifnull 3
         2: .line 144
            aload 1 /* vec */
            new org.bouncycastle.asn1.DERTaggedObject
            dup
            iconst_0
            aload 0 /* this */
            getfield org.bouncycastle.asn1.x509.CertificatePair.forward:Lorg/bouncycastle/asn1/x509/X509CertificateStructure;
            invokespecial org.bouncycastle.asn1.DERTaggedObject.<init>:(ILorg/bouncycastle/asn1/DEREncodable;)V
            invokevirtual org.bouncycastle.asn1.ASN1EncodableVector.add:(Lorg/bouncycastle/asn1/DEREncodable;)V
         3: .line 146
      StackMap locals: org.bouncycastle.asn1.ASN1EncodableVector
      StackMap stack:
            aload 0 /* this */
            getfield org.bouncycastle.asn1.x509.CertificatePair.reverse:Lorg/bouncycastle/asn1/x509/X509CertificateStructure;
            ifnull 5
         4: .line 148
            aload 1 /* vec */
            new org.bouncycastle.asn1.DERTaggedObject
            dup
            iconst_1
            aload 0 /* this */
            getfield org.bouncycastle.asn1.x509.CertificatePair.reverse:Lorg/bouncycastle/asn1/x509/X509CertificateStructure;
            invokespecial org.bouncycastle.asn1.DERTaggedObject.<init>:(ILorg/bouncycastle/asn1/DEREncodable;)V
            invokevirtual org.bouncycastle.asn1.ASN1EncodableVector.add:(Lorg/bouncycastle/asn1/DEREncodable;)V
         5: .line 151
      StackMap locals:
      StackMap stack:
            new org.bouncycastle.asn1.DERSequence
            dup
            aload 1 /* vec */
            invokespecial org.bouncycastle.asn1.DERSequence.<init>:(Lorg/bouncycastle/asn1/ASN1EncodableVector;)V
            areturn
        end local 1 // org.bouncycastle.asn1.ASN1EncodableVector vec
        end local 0 // org.bouncycastle.asn1.x509.CertificatePair this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    6     0  this  Lorg/bouncycastle/asn1/x509/CertificatePair;
            1    6     1   vec  Lorg/bouncycastle/asn1/ASN1EncodableVector;

  public org.bouncycastle.asn1.x509.X509CertificateStructure getForward();
    descriptor: ()Lorg/bouncycastle/asn1/x509/X509CertificateStructure;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.asn1.x509.CertificatePair this
         0: .line 159
            aload 0 /* this */
            getfield org.bouncycastle.asn1.x509.CertificatePair.forward:Lorg/bouncycastle/asn1/x509/X509CertificateStructure;
            areturn
        end local 0 // org.bouncycastle.asn1.x509.CertificatePair this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/asn1/x509/CertificatePair;

  public org.bouncycastle.asn1.x509.X509CertificateStructure getReverse();
    descriptor: ()Lorg/bouncycastle/asn1/x509/X509CertificateStructure;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.asn1.x509.CertificatePair this
         0: .line 167
            aload 0 /* this */
            getfield org.bouncycastle.asn1.x509.CertificatePair.reverse:Lorg/bouncycastle/asn1/x509/X509CertificateStructure;
            areturn
        end local 0 // org.bouncycastle.asn1.x509.CertificatePair this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/asn1/x509/CertificatePair;
}
SourceFile: "CertificatePair.java"