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.operator.jcajce.OperatorUtils
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.bouncycastle.operator.jcajce.OperatorUtils
  super_class: java.lang.Object
{
  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.operator.jcajce.OperatorUtils this
         0: .line 9
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.bouncycastle.operator.jcajce.OperatorUtils this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/operator/jcajce/OperatorUtils;

  static java.security.Key getJceKey(org.bouncycastle.operator.GenericKey);
    descriptor: (Lorg/bouncycastle/operator/GenericKey;)Ljava/security/Key;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=4, locals=1, args_size=1
        start local 0 // org.bouncycastle.operator.GenericKey key
         0: .line 13
            aload 0 /* key */
            invokevirtual org.bouncycastle.operator.GenericKey.getRepresentation:()Ljava/lang/Object;
            instanceof java.security.Key
            ifeq 2
         1: .line 15
            aload 0 /* key */
            invokevirtual org.bouncycastle.operator.GenericKey.getRepresentation:()Ljava/lang/Object;
            checkcast java.security.Key
            areturn
         2: .line 18
      StackMap locals:
      StackMap stack:
            aload 0 /* key */
            invokevirtual org.bouncycastle.operator.GenericKey.getRepresentation:()Ljava/lang/Object;
            instanceof byte[]
            ifeq 4
         3: .line 20
            new javax.crypto.spec.SecretKeySpec
            dup
            aload 0 /* key */
            invokevirtual org.bouncycastle.operator.GenericKey.getRepresentation:()Ljava/lang/Object;
            checkcast byte[]
            ldc "ENC"
            invokespecial javax.crypto.spec.SecretKeySpec.<init>:([BLjava/lang/String;)V
            areturn
         4: .line 23
      StackMap locals:
      StackMap stack:
            new java.lang.IllegalArgumentException
            dup
            ldc "unknown generic key type"
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
        end local 0 // org.bouncycastle.operator.GenericKey key
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0   key  Lorg/bouncycastle/operator/GenericKey;
    MethodParameters:
      Name  Flags
      key   
}
SourceFile: "OperatorUtils.java"