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.bc.AESUtil
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.bouncycastle.operator.bc.AESUtil
  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.bc.AESUtil this
         0: .line 8
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.bouncycastle.operator.bc.AESUtil this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/operator/bc/AESUtil;

  static org.bouncycastle.asn1.x509.AlgorithmIdentifier determineKeyEncAlg(org.bouncycastle.crypto.params.KeyParameter);
    descriptor: (Lorg/bouncycastle/crypto/params/KeyParameter;)Lorg/bouncycastle/asn1/x509/AlgorithmIdentifier;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=3, locals=3, args_size=1
        start local 0 // org.bouncycastle.crypto.params.KeyParameter key
         0: .line 12
            aload 0 /* key */
            invokevirtual org.bouncycastle.crypto.params.KeyParameter.getKey:()[B
            arraylength
            bipush 8
            imul
            istore 1 /* length */
        start local 1 // int length
         1: .line 15
            iload 1 /* length */
            sipush 128
            if_icmpne 4
         2: .line 17
            getstatic org.bouncycastle.asn1.nist.NISTObjectIdentifiers.id_aes128_wrap:Lorg/bouncycastle/asn1/ASN1ObjectIdentifier;
            astore 2 /* wrapOid */
        start local 2 // org.bouncycastle.asn1.ASN1ObjectIdentifier wrapOid
         3: .line 18
            goto 11
        end local 2 // org.bouncycastle.asn1.ASN1ObjectIdentifier wrapOid
         4: .line 19
      StackMap locals: int
      StackMap stack:
            iload 1 /* length */
            sipush 192
            if_icmpne 7
         5: .line 21
            getstatic org.bouncycastle.asn1.nist.NISTObjectIdentifiers.id_aes192_wrap:Lorg/bouncycastle/asn1/ASN1ObjectIdentifier;
            astore 2 /* wrapOid */
        start local 2 // org.bouncycastle.asn1.ASN1ObjectIdentifier wrapOid
         6: .line 22
            goto 11
        end local 2 // org.bouncycastle.asn1.ASN1ObjectIdentifier wrapOid
         7: .line 23
      StackMap locals:
      StackMap stack:
            iload 1 /* length */
            sipush 256
            if_icmpne 10
         8: .line 25
            getstatic org.bouncycastle.asn1.nist.NISTObjectIdentifiers.id_aes256_wrap:Lorg/bouncycastle/asn1/ASN1ObjectIdentifier;
            astore 2 /* wrapOid */
        start local 2 // org.bouncycastle.asn1.ASN1ObjectIdentifier wrapOid
         9: .line 26
            goto 11
        end local 2 // org.bouncycastle.asn1.ASN1ObjectIdentifier wrapOid
        10: .line 29
      StackMap locals:
      StackMap stack:
            new java.lang.IllegalArgumentException
            dup
            ldc "illegal keysize in AES"
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
        start local 2 // org.bouncycastle.asn1.ASN1ObjectIdentifier wrapOid
        11: .line 32
      StackMap locals: org.bouncycastle.asn1.ASN1ObjectIdentifier
      StackMap stack:
            new org.bouncycastle.asn1.x509.AlgorithmIdentifier
            dup
            aload 2 /* wrapOid */
            invokespecial org.bouncycastle.asn1.x509.AlgorithmIdentifier.<init>:(Lorg/bouncycastle/asn1/ASN1ObjectIdentifier;)V
            areturn
        end local 2 // org.bouncycastle.asn1.ASN1ObjectIdentifier wrapOid
        end local 1 // int length
        end local 0 // org.bouncycastle.crypto.params.KeyParameter key
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0   12     0      key  Lorg/bouncycastle/crypto/params/KeyParameter;
            1   12     1   length  I
            3    4     2  wrapOid  Lorg/bouncycastle/asn1/ASN1ObjectIdentifier;
            6    7     2  wrapOid  Lorg/bouncycastle/asn1/ASN1ObjectIdentifier;
            9   10     2  wrapOid  Lorg/bouncycastle/asn1/ASN1ObjectIdentifier;
           11   12     2  wrapOid  Lorg/bouncycastle/asn1/ASN1ObjectIdentifier;
    MethodParameters:
      Name  Flags
      key   
}
SourceFile: "AESUtil.java"