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

  private org.bouncycastle.asn1.ASN1OctetString witness;
    descriptor: Lorg/bouncycastle/asn1/ASN1OctetString;
    flags: (0x0002) ACC_PRIVATE

  private org.bouncycastle.asn1.ASN1OctetString challenge;
    descriptor: Lorg/bouncycastle/asn1/ASN1OctetString;
    flags: (0x0002) ACC_PRIVATE

  private void <init>(org.bouncycastle.asn1.ASN1Sequence);
    descriptor: (Lorg/bouncycastle/asn1/ASN1Sequence;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // org.bouncycastle.asn1.cmp.Challenge this
        start local 1 // org.bouncycastle.asn1.ASN1Sequence seq
         0: .line 18
            aload 0 /* this */
            invokespecial org.bouncycastle.asn1.ASN1Encodable.<init>:()V
         1: .line 20
            iconst_0
            istore 2 /* index */
        start local 2 // int index
         2: .line 22
            aload 1 /* seq */
            invokevirtual org.bouncycastle.asn1.ASN1Sequence.size:()I
            iconst_3
            if_icmpne 4
         3: .line 24
            aload 0 /* this */
            aload 1 /* seq */
            iload 2 /* index */
            iinc 2 /* index */ 1
            invokevirtual org.bouncycastle.asn1.ASN1Sequence.getObjectAt:(I)Lorg/bouncycastle/asn1/DEREncodable;
            invokestatic org.bouncycastle.asn1.x509.AlgorithmIdentifier.getInstance:(Ljava/lang/Object;)Lorg/bouncycastle/asn1/x509/AlgorithmIdentifier;
            putfield org.bouncycastle.asn1.cmp.Challenge.owf:Lorg/bouncycastle/asn1/x509/AlgorithmIdentifier;
         4: .line 27
      StackMap locals: org.bouncycastle.asn1.cmp.Challenge org.bouncycastle.asn1.ASN1Sequence int
      StackMap stack:
            aload 0 /* this */
            aload 1 /* seq */
            iload 2 /* index */
            iinc 2 /* index */ 1
            invokevirtual org.bouncycastle.asn1.ASN1Sequence.getObjectAt:(I)Lorg/bouncycastle/asn1/DEREncodable;
            invokestatic org.bouncycastle.asn1.ASN1OctetString.getInstance:(Ljava/lang/Object;)Lorg/bouncycastle/asn1/ASN1OctetString;
            putfield org.bouncycastle.asn1.cmp.Challenge.witness:Lorg/bouncycastle/asn1/ASN1OctetString;
         5: .line 28
            aload 0 /* this */
            aload 1 /* seq */
            iload 2 /* index */
            invokevirtual org.bouncycastle.asn1.ASN1Sequence.getObjectAt:(I)Lorg/bouncycastle/asn1/DEREncodable;
            invokestatic org.bouncycastle.asn1.ASN1OctetString.getInstance:(Ljava/lang/Object;)Lorg/bouncycastle/asn1/ASN1OctetString;
            putfield org.bouncycastle.asn1.cmp.Challenge.challenge:Lorg/bouncycastle/asn1/ASN1OctetString;
         6: .line 29
            return
        end local 2 // int index
        end local 1 // org.bouncycastle.asn1.ASN1Sequence seq
        end local 0 // org.bouncycastle.asn1.cmp.Challenge this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    7     0   this  Lorg/bouncycastle/asn1/cmp/Challenge;
            0    7     1    seq  Lorg/bouncycastle/asn1/ASN1Sequence;
            2    7     2  index  I
    MethodParameters:
      Name  Flags
      seq   

  public static org.bouncycastle.asn1.cmp.Challenge getInstance(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Lorg/bouncycastle/asn1/cmp/Challenge;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=5, locals=1, args_size=1
        start local 0 // java.lang.Object o
         0: .line 33
            aload 0 /* o */
            instanceof org.bouncycastle.asn1.cmp.Challenge
            ifeq 2
         1: .line 35
            aload 0 /* o */
            checkcast org.bouncycastle.asn1.cmp.Challenge
            areturn
         2: .line 38
      StackMap locals:
      StackMap stack:
            aload 0 /* o */
            instanceof org.bouncycastle.asn1.ASN1Sequence
            ifeq 4
         3: .line 40
            new org.bouncycastle.asn1.cmp.Challenge
            dup
            aload 0 /* o */
            checkcast org.bouncycastle.asn1.ASN1Sequence
            invokespecial org.bouncycastle.asn1.cmp.Challenge.<init>:(Lorg/bouncycastle/asn1/ASN1Sequence;)V
            areturn
         4: .line 43
      StackMap locals:
      StackMap stack:
            new java.lang.IllegalArgumentException
            dup
            new java.lang.StringBuilder
            dup
            ldc "Invalid object: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 0 /* o */
            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;
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
        end local 0 // java.lang.Object o
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0     o  Ljava/lang/Object;
    MethodParameters:
      Name  Flags
      o     

  public org.bouncycastle.asn1.x509.AlgorithmIdentifier getOwf();
    descriptor: ()Lorg/bouncycastle/asn1/x509/AlgorithmIdentifier;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.asn1.cmp.Challenge this
         0: .line 48
            aload 0 /* this */
            getfield org.bouncycastle.asn1.cmp.Challenge.owf:Lorg/bouncycastle/asn1/x509/AlgorithmIdentifier;
            areturn
        end local 0 // org.bouncycastle.asn1.cmp.Challenge this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/asn1/cmp/Challenge;

  public org.bouncycastle.asn1.DERObject toASN1Object();
    descriptor: ()Lorg/bouncycastle/asn1/DERObject;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=1
        start local 0 // org.bouncycastle.asn1.cmp.Challenge this
         0: .line 80
            new org.bouncycastle.asn1.ASN1EncodableVector
            dup
            invokespecial org.bouncycastle.asn1.ASN1EncodableVector.<init>:()V
            astore 1 /* v */
        start local 1 // org.bouncycastle.asn1.ASN1EncodableVector v
         1: .line 82
            aload 0 /* this */
            aload 1 /* v */
            aload 0 /* this */
            getfield org.bouncycastle.asn1.cmp.Challenge.owf:Lorg/bouncycastle/asn1/x509/AlgorithmIdentifier;
            invokevirtual org.bouncycastle.asn1.cmp.Challenge.addOptional:(Lorg/bouncycastle/asn1/ASN1EncodableVector;Lorg/bouncycastle/asn1/ASN1Encodable;)V
         2: .line 83
            aload 1 /* v */
            aload 0 /* this */
            getfield org.bouncycastle.asn1.cmp.Challenge.witness:Lorg/bouncycastle/asn1/ASN1OctetString;
            invokevirtual org.bouncycastle.asn1.ASN1EncodableVector.add:(Lorg/bouncycastle/asn1/DEREncodable;)V
         3: .line 84
            aload 1 /* v */
            aload 0 /* this */
            getfield org.bouncycastle.asn1.cmp.Challenge.challenge:Lorg/bouncycastle/asn1/ASN1OctetString;
            invokevirtual org.bouncycastle.asn1.ASN1EncodableVector.add:(Lorg/bouncycastle/asn1/DEREncodable;)V
         4: .line 86
            new org.bouncycastle.asn1.DERSequence
            dup
            aload 1 /* v */
            invokespecial org.bouncycastle.asn1.DERSequence.<init>:(Lorg/bouncycastle/asn1/ASN1EncodableVector;)V
            areturn
        end local 1 // org.bouncycastle.asn1.ASN1EncodableVector v
        end local 0 // org.bouncycastle.asn1.cmp.Challenge this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lorg/bouncycastle/asn1/cmp/Challenge;
            1    5     1     v  Lorg/bouncycastle/asn1/ASN1EncodableVector;

  private void addOptional(org.bouncycastle.asn1.ASN1EncodableVector, org.bouncycastle.asn1.ASN1Encodable);
    descriptor: (Lorg/bouncycastle/asn1/ASN1EncodableVector;Lorg/bouncycastle/asn1/ASN1Encodable;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // org.bouncycastle.asn1.cmp.Challenge this
        start local 1 // org.bouncycastle.asn1.ASN1EncodableVector v
        start local 2 // org.bouncycastle.asn1.ASN1Encodable obj
         0: .line 91
            aload 2 /* obj */
            ifnull 2
         1: .line 93
            aload 1 /* v */
            aload 2 /* obj */
            invokevirtual org.bouncycastle.asn1.ASN1EncodableVector.add:(Lorg/bouncycastle/asn1/DEREncodable;)V
         2: .line 95
      StackMap locals:
      StackMap stack:
            return
        end local 2 // org.bouncycastle.asn1.ASN1Encodable obj
        end local 1 // org.bouncycastle.asn1.ASN1EncodableVector v
        end local 0 // org.bouncycastle.asn1.cmp.Challenge this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/bouncycastle/asn1/cmp/Challenge;
            0    3     1     v  Lorg/bouncycastle/asn1/ASN1EncodableVector;
            0    3     2   obj  Lorg/bouncycastle/asn1/ASN1Encodable;
    MethodParameters:
      Name  Flags
      v     
      obj   
}
SourceFile: "Challenge.java"