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. 
class org.bouncycastle.jce.provider.RSAUtil
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.bouncycastle.jce.provider.RSAUtil
  super_class: java.lang.Object
{
  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.jce.provider.RSAUtil this
         0: .line 17
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.bouncycastle.jce.provider.RSAUtil this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/jce/provider/RSAUtil;

  static boolean isRsaOid(org.bouncycastle.asn1.DERObjectIdentifier);
    descriptor: (Lorg/bouncycastle/asn1/DERObjectIdentifier;)Z
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.bouncycastle.asn1.DERObjectIdentifier algOid
         0: .line 22
            aload 0 /* algOid */
            getstatic org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers.rsaEncryption:Lorg/bouncycastle/asn1/ASN1ObjectIdentifier;
            invokevirtual org.bouncycastle.asn1.DERObjectIdentifier.equals:(Ljava/lang/Object;)Z
            ifne 5
         1: .line 23
            aload 0 /* algOid */
            getstatic org.bouncycastle.asn1.x509.X509ObjectIdentifiers.id_ea_rsa:Lorg/bouncycastle/asn1/ASN1ObjectIdentifier;
            invokevirtual org.bouncycastle.asn1.DERObjectIdentifier.equals:(Ljava/lang/Object;)Z
            ifne 5
         2: .line 24
            aload 0 /* algOid */
            getstatic org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers.id_RSASSA_PSS:Lorg/bouncycastle/asn1/ASN1ObjectIdentifier;
            invokevirtual org.bouncycastle.asn1.DERObjectIdentifier.equals:(Ljava/lang/Object;)Z
            ifne 5
         3: .line 25
            aload 0 /* algOid */
            getstatic org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers.id_RSAES_OAEP:Lorg/bouncycastle/asn1/ASN1ObjectIdentifier;
            invokevirtual org.bouncycastle.asn1.DERObjectIdentifier.equals:(Ljava/lang/Object;)Z
            ifne 5
         4: .line 22
            iconst_0
            ireturn
      StackMap locals:
      StackMap stack:
         5: iconst_1
            ireturn
        end local 0 // org.bouncycastle.asn1.DERObjectIdentifier algOid
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    6     0  algOid  Lorg/bouncycastle/asn1/DERObjectIdentifier;
    MethodParameters:
        Name  Flags
      algOid  

  static org.bouncycastle.crypto.params.RSAKeyParameters generatePublicKeyParameter(java.security.interfaces.RSAPublicKey);
    descriptor: (Ljava/security/interfaces/RSAPublicKey;)Lorg/bouncycastle/crypto/params/RSAKeyParameters;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=5, locals=1, args_size=1
        start local 0 // java.security.interfaces.RSAPublicKey key
         0: .line 31
            new org.bouncycastle.crypto.params.RSAKeyParameters
            dup
            iconst_0
            aload 0 /* key */
            invokeinterface java.security.interfaces.RSAPublicKey.getModulus:()Ljava/math/BigInteger;
            aload 0 /* key */
            invokeinterface java.security.interfaces.RSAPublicKey.getPublicExponent:()Ljava/math/BigInteger;
            invokespecial org.bouncycastle.crypto.params.RSAKeyParameters.<init>:(ZLjava/math/BigInteger;Ljava/math/BigInteger;)V
            areturn
        end local 0 // java.security.interfaces.RSAPublicKey key
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0   key  Ljava/security/interfaces/RSAPublicKey;
    MethodParameters:
      Name  Flags
      key   

  static org.bouncycastle.crypto.params.RSAKeyParameters generatePrivateKeyParameter(java.security.interfaces.RSAPrivateKey);
    descriptor: (Ljava/security/interfaces/RSAPrivateKey;)Lorg/bouncycastle/crypto/params/RSAKeyParameters;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=10, locals=2, args_size=1
        start local 0 // java.security.interfaces.RSAPrivateKey key
         0: .line 38
            aload 0 /* key */
            instanceof java.security.interfaces.RSAPrivateCrtKey
            ifeq 6
         1: .line 40
            aload 0 /* key */
            checkcast java.security.interfaces.RSAPrivateCrtKey
            astore 1 /* k */
        start local 1 // java.security.interfaces.RSAPrivateCrtKey k
         2: .line 42
            new org.bouncycastle.crypto.params.RSAPrivateCrtKeyParameters
            dup
            aload 1 /* k */
            invokeinterface java.security.interfaces.RSAPrivateCrtKey.getModulus:()Ljava/math/BigInteger;
         3: .line 43
            aload 1 /* k */
            invokeinterface java.security.interfaces.RSAPrivateCrtKey.getPublicExponent:()Ljava/math/BigInteger;
            aload 1 /* k */
            invokeinterface java.security.interfaces.RSAPrivateCrtKey.getPrivateExponent:()Ljava/math/BigInteger;
         4: .line 44
            aload 1 /* k */
            invokeinterface java.security.interfaces.RSAPrivateCrtKey.getPrimeP:()Ljava/math/BigInteger;
            aload 1 /* k */
            invokeinterface java.security.interfaces.RSAPrivateCrtKey.getPrimeQ:()Ljava/math/BigInteger;
            aload 1 /* k */
            invokeinterface java.security.interfaces.RSAPrivateCrtKey.getPrimeExponentP:()Ljava/math/BigInteger;
            aload 1 /* k */
            invokeinterface java.security.interfaces.RSAPrivateCrtKey.getPrimeExponentQ:()Ljava/math/BigInteger;
            aload 1 /* k */
            invokeinterface java.security.interfaces.RSAPrivateCrtKey.getCrtCoefficient:()Ljava/math/BigInteger;
         5: .line 42
            invokespecial org.bouncycastle.crypto.params.RSAPrivateCrtKeyParameters.<init>:(Ljava/math/BigInteger;Ljava/math/BigInteger;Ljava/math/BigInteger;Ljava/math/BigInteger;Ljava/math/BigInteger;Ljava/math/BigInteger;Ljava/math/BigInteger;Ljava/math/BigInteger;)V
            areturn
        end local 1 // java.security.interfaces.RSAPrivateCrtKey k
         6: .line 48
      StackMap locals:
      StackMap stack:
            aload 0 /* key */
            astore 1 /* k */
        start local 1 // java.security.interfaces.RSAPrivateKey k
         7: .line 50
            new org.bouncycastle.crypto.params.RSAKeyParameters
            dup
            iconst_1
            aload 1 /* k */
            invokeinterface java.security.interfaces.RSAPrivateKey.getModulus:()Ljava/math/BigInteger;
            aload 1 /* k */
            invokeinterface java.security.interfaces.RSAPrivateKey.getPrivateExponent:()Ljava/math/BigInteger;
            invokespecial org.bouncycastle.crypto.params.RSAKeyParameters.<init>:(ZLjava/math/BigInteger;Ljava/math/BigInteger;)V
            areturn
        end local 1 // java.security.interfaces.RSAPrivateKey k
        end local 0 // java.security.interfaces.RSAPrivateKey key
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    8     0   key  Ljava/security/interfaces/RSAPrivateKey;
            2    6     1     k  Ljava/security/interfaces/RSAPrivateCrtKey;
            7    8     1     k  Ljava/security/interfaces/RSAPrivateKey;
    MethodParameters:
      Name  Flags
      key   
}
SourceFile: "RSAUtil.java"