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 to JDK 1.8.
  • The Legion of the Bouncy Castle Inc. 
public class org.bouncycastle.jcajce.spec.UserKeyingMaterialSpec implements java.security.spec.AlgorithmParameterSpec
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.bouncycastle.jcajce.spec.UserKeyingMaterialSpec
  super_class: java.lang.Object
{
  private final byte[] userKeyingMaterial;
    descriptor: [B
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  public void <init>(byte[]);
    descriptor: ([B)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.bouncycastle.jcajce.spec.UserKeyingMaterialSpec this
        start local 1 // byte[] userKeyingMaterial
         0: .line 12
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 14
            aload 0 /* this */
            aload 1 /* userKeyingMaterial */
            invokestatic org.bouncycastle.util.Arrays.clone:([B)[B
            putfield org.bouncycastle.jcajce.spec.UserKeyingMaterialSpec.userKeyingMaterial:[B
         2: .line 15
            return
        end local 1 // byte[] userKeyingMaterial
        end local 0 // org.bouncycastle.jcajce.spec.UserKeyingMaterialSpec this
      LocalVariableTable:
        Start  End  Slot                Name  Signature
            0    3     0                this  Lorg/bouncycastle/jcajce/spec/UserKeyingMaterialSpec;
            0    3     1  userKeyingMaterial  [B
    MethodParameters:
                    Name  Flags
      userKeyingMaterial  

  public byte[] getUserKeyingMaterial();
    descriptor: ()[B
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.jcajce.spec.UserKeyingMaterialSpec this
         0: .line 19
            aload 0 /* this */
            getfield org.bouncycastle.jcajce.spec.UserKeyingMaterialSpec.userKeyingMaterial:[B
            invokestatic org.bouncycastle.util.Arrays.clone:([B)[B
            areturn
        end local 0 // org.bouncycastle.jcajce.spec.UserKeyingMaterialSpec this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/jcajce/spec/UserKeyingMaterialSpec;
}
SourceFile: "UserKeyingMaterialSpec.java"