http://www.bouncycastle.org/java.html: The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.
  • The Legion of the Bouncy Castle Inc. 
class org.bouncycastle.cms.jcajce.DefaultJcaJceExtHelper extends org.bouncycastle.jcajce.util.DefaultJcaJceHelper implements org.bouncycastle.cms.jcajce.JcaJceExtHelper
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.bouncycastle.cms.jcajce.DefaultJcaJceExtHelper
  super_class: org.bouncycastle.jcajce.util.DefaultJcaJceHelper
{
  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.cms.jcajce.DefaultJcaJceExtHelper this
         0: .line 14
            aload 0 /* this */
            invokespecial org.bouncycastle.jcajce.util.DefaultJcaJceHelper.<init>:()V
            return
        end local 0 // org.bouncycastle.cms.jcajce.DefaultJcaJceExtHelper this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/cms/jcajce/DefaultJcaJceExtHelper;

  public org.bouncycastle.operator.jcajce.JceAsymmetricKeyUnwrapper createAsymmetricUnwrapper(org.bouncycastle.asn1.x509.AlgorithmIdentifier, java.security.PrivateKey);
    descriptor: (Lorg/bouncycastle/asn1/x509/AlgorithmIdentifier;Ljava/security/PrivateKey;)Lorg/bouncycastle/operator/jcajce/JceAsymmetricKeyUnwrapper;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=3, args_size=3
        start local 0 // org.bouncycastle.cms.jcajce.DefaultJcaJceExtHelper this
        start local 1 // org.bouncycastle.asn1.x509.AlgorithmIdentifier keyEncryptionAlgorithm
        start local 2 // java.security.PrivateKey keyEncryptionKey
         0: .line 20
            new org.bouncycastle.operator.jcajce.JceAsymmetricKeyUnwrapper
            dup
            aload 1 /* keyEncryptionAlgorithm */
            aload 2 /* keyEncryptionKey */
            invokespecial org.bouncycastle.operator.jcajce.JceAsymmetricKeyUnwrapper.<init>:(Lorg/bouncycastle/asn1/x509/AlgorithmIdentifier;Ljava/security/PrivateKey;)V
            areturn
        end local 2 // java.security.PrivateKey keyEncryptionKey
        end local 1 // org.bouncycastle.asn1.x509.AlgorithmIdentifier keyEncryptionAlgorithm
        end local 0 // org.bouncycastle.cms.jcajce.DefaultJcaJceExtHelper this
      LocalVariableTable:
        Start  End  Slot                    Name  Signature
            0    1     0                    this  Lorg/bouncycastle/cms/jcajce/DefaultJcaJceExtHelper;
            0    1     1  keyEncryptionAlgorithm  Lorg/bouncycastle/asn1/x509/AlgorithmIdentifier;
            0    1     2        keyEncryptionKey  Ljava/security/PrivateKey;
    MethodParameters:
                        Name  Flags
      keyEncryptionAlgorithm  
      keyEncryptionKey        

  public org.bouncycastle.operator.jcajce.JceKTSKeyUnwrapper createAsymmetricUnwrapper(org.bouncycastle.asn1.x509.AlgorithmIdentifier, java.security.PrivateKey, byte[], byte[]);
    descriptor: (Lorg/bouncycastle/asn1/x509/AlgorithmIdentifier;Ljava/security/PrivateKey;[B[B)Lorg/bouncycastle/operator/jcajce/JceKTSKeyUnwrapper;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=6, locals=5, args_size=5
        start local 0 // org.bouncycastle.cms.jcajce.DefaultJcaJceExtHelper this
        start local 1 // org.bouncycastle.asn1.x509.AlgorithmIdentifier keyEncryptionAlgorithm
        start local 2 // java.security.PrivateKey keyEncryptionKey
        start local 3 // byte[] partyUInfo
        start local 4 // byte[] partyVInfo
         0: .line 25
            new org.bouncycastle.operator.jcajce.JceKTSKeyUnwrapper
            dup
            aload 1 /* keyEncryptionAlgorithm */
            aload 2 /* keyEncryptionKey */
            aload 3 /* partyUInfo */
            aload 4 /* partyVInfo */
            invokespecial org.bouncycastle.operator.jcajce.JceKTSKeyUnwrapper.<init>:(Lorg/bouncycastle/asn1/x509/AlgorithmIdentifier;Ljava/security/PrivateKey;[B[B)V
            areturn
        end local 4 // byte[] partyVInfo
        end local 3 // byte[] partyUInfo
        end local 2 // java.security.PrivateKey keyEncryptionKey
        end local 1 // org.bouncycastle.asn1.x509.AlgorithmIdentifier keyEncryptionAlgorithm
        end local 0 // org.bouncycastle.cms.jcajce.DefaultJcaJceExtHelper this
      LocalVariableTable:
        Start  End  Slot                    Name  Signature
            0    1     0                    this  Lorg/bouncycastle/cms/jcajce/DefaultJcaJceExtHelper;
            0    1     1  keyEncryptionAlgorithm  Lorg/bouncycastle/asn1/x509/AlgorithmIdentifier;
            0    1     2        keyEncryptionKey  Ljava/security/PrivateKey;
            0    1     3              partyUInfo  [B
            0    1     4              partyVInfo  [B
    MethodParameters:
                        Name  Flags
      keyEncryptionAlgorithm  
      keyEncryptionKey        
      partyUInfo              
      partyVInfo              

  public org.bouncycastle.operator.SymmetricKeyUnwrapper createSymmetricUnwrapper(org.bouncycastle.asn1.x509.AlgorithmIdentifier, javax.crypto.SecretKey);
    descriptor: (Lorg/bouncycastle/asn1/x509/AlgorithmIdentifier;Ljavax/crypto/SecretKey;)Lorg/bouncycastle/operator/SymmetricKeyUnwrapper;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=3, args_size=3
        start local 0 // org.bouncycastle.cms.jcajce.DefaultJcaJceExtHelper this
        start local 1 // org.bouncycastle.asn1.x509.AlgorithmIdentifier keyEncryptionAlgorithm
        start local 2 // javax.crypto.SecretKey keyEncryptionKey
         0: .line 30
            new org.bouncycastle.operator.jcajce.JceSymmetricKeyUnwrapper
            dup
            aload 1 /* keyEncryptionAlgorithm */
            aload 2 /* keyEncryptionKey */
            invokespecial org.bouncycastle.operator.jcajce.JceSymmetricKeyUnwrapper.<init>:(Lorg/bouncycastle/asn1/x509/AlgorithmIdentifier;Ljavax/crypto/SecretKey;)V
            areturn
        end local 2 // javax.crypto.SecretKey keyEncryptionKey
        end local 1 // org.bouncycastle.asn1.x509.AlgorithmIdentifier keyEncryptionAlgorithm
        end local 0 // org.bouncycastle.cms.jcajce.DefaultJcaJceExtHelper this
      LocalVariableTable:
        Start  End  Slot                    Name  Signature
            0    1     0                    this  Lorg/bouncycastle/cms/jcajce/DefaultJcaJceExtHelper;
            0    1     1  keyEncryptionAlgorithm  Lorg/bouncycastle/asn1/x509/AlgorithmIdentifier;
            0    1     2        keyEncryptionKey  Ljavax/crypto/SecretKey;
    MethodParameters:
                        Name  Flags
      keyEncryptionAlgorithm  
      keyEncryptionKey        
}
SourceFile: "DefaultJcaJceExtHelper.java"