Package org.activecomponents.udp.asymciphers

Class RsaCipher

  • All Implemented Interfaces:
    IAsymCipher
    public class RsaCipher
extends java.lang.Object
implements IAsymCipher

    • Field Summary

      Fields 
      Modifier and Type Field Description
      protected org.bouncycastle.crypto.params.AsymmetricKeyParameter foreignpublic
      Public key of the communication partner.
      protected org.bouncycastle.crypto.AsymmetricCipherKeyPair keypair
      Keypair
      protected org.bouncycastle.crypto.AsymmetricBlockCipher oaeprsa
      OAEP engine.
      protected org.bouncycastle.crypto.Signer pssrsa
      PSS engine.

    • Constructor Summary

      Constructors 
      Constructor Description
      RsaCipher​(RsaKeyProvider kp)  
      RsaCipher​(org.bouncycastle.crypto.AsymmetricCipherKeyPair keypair)  

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      org.bouncycastle.crypto.params.AsymmetricKeyParameter byteArrayToKey​(byte[] enckey)
      Converts a key from binary form.
      byte[] decrypt​(byte[] ciphertext)
      Decrypts a message.
      byte[] decryptAndVerify​(byte[] ciphertext, boolean verifywithforeign)
      Decrypts a message and verifies the signature.
      byte[] encrypt​(byte[] plain, boolean foreign)
      Encrypts a message using a public key.
      byte[] keyToByteArray​(org.bouncycastle.crypto.params.AsymmetricKeyParameter key)
      Converts a key to binary form.
      static void main​(java.lang.String[] args)  
      boolean setForeign​(byte[] foreignpublic)
      Sets the public key of the communication partner.
      byte[] sign​(byte[] msg)
      Signs a message.
      byte[] signAndEncrypt​(byte[] msg, boolean encryptwithforeign)
      Signs a message and encrypts a message.
      byte[] verify​(byte[] msgwithsig, boolean foreign)
      Verifies a message.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • keypair

        protected org.bouncycastle.crypto.AsymmetricCipherKeyPair keypair
        Keypair

      • foreignpublic

        protected org.bouncycastle.crypto.params.AsymmetricKeyParameter foreignpublic
        Public key of the communication partner.

      • pssrsa

        protected org.bouncycastle.crypto.Signer pssrsa
        PSS engine.

      • oaeprsa

        protected org.bouncycastle.crypto.AsymmetricBlockCipher oaeprsa
        OAEP engine.

    • Constructor Detail

      • RsaCipher

        public RsaCipher​(org.bouncycastle.crypto.AsymmetricCipherKeyPair keypair)

    • Method Detail

      • main

        public static void main​(java.lang.String[] args)

      • setForeign

        public boolean setForeign​(byte[] foreignpublic)
        Sets the public key of the communication partner.
        Specified by:
        setForeign in interface IAsymCipher
        Parameters:
        foreignpublic - The public key.
        Returns:
        False, if the key was invalid.

      • encrypt

        public byte[] encrypt​(byte[] plain,
                      boolean foreign)
        Encrypts a message using a public key.
        Parameters:
        plain - The plain text.
        foreign - True, if the foreign public key should be used, false, if the innate one should be used.
        Returns:
        The cipher text.

      • decrypt

        public byte[] decrypt​(byte[] ciphertext)
        Decrypts a message.
        Parameters:
        ciphertext - The cipher text.
        Returns:
        The plain text or null if decryption failed.

      • sign

        public byte[] sign​(byte[] msg)
        Signs a message.
        Parameters:
        msg - The message.
        Returns:
        The message with signature.

      • verify

        public byte[] verify​(byte[] msgwithsig,
                     boolean foreign)
        Verifies a message.
        Parameters:
        msg - The message with signature.
        foreign - True, if the foreign public key should be used, false, if the innate one should be used.
        Returns:
        The message or null if the verification failed.

      • signAndEncrypt

        public byte[] signAndEncrypt​(byte[] msg,
                             boolean encryptwithforeign)
        Signs a message and encrypts a message.
        Specified by:
        signAndEncrypt in interface IAsymCipher
        Parameters:
        msg - The message.
        encryptwithforeign - True, if the foreign public key should be used for encryption, false, if the innate one should be used.
        Returns:
        The message with signature, encrypted.

      • decryptAndVerify

        public byte[] decryptAndVerify​(byte[] ciphertext,
                               boolean verifywithforeign)
        Decrypts a message and verifies the signature.
        Specified by:
        decryptAndVerify in interface IAsymCipher
        Parameters:
        msg - The signed and encrypted message.
        encryptwithforeign - True, if the foreign public key should be used for verification, false, if the innate one should be used.
        Returns:
        The message, null if verification failed.

      • keyToByteArray

        public byte[] keyToByteArray​(org.bouncycastle.crypto.params.AsymmetricKeyParameter key)
        Converts a key to binary form.
        Specified by:
        keyToByteArray in interface IAsymCipher
        Parameters:
        key - The key.
        Returns:
        The binary form of the key.

      • byteArrayToKey

        public org.bouncycastle.crypto.params.AsymmetricKeyParameter byteArrayToKey​(byte[] enckey)
        Converts a key from binary form.
        Specified by:
        byteArrayToKey in interface IAsymCipher
        Parameters:
        enckey - The encoded key.
        Returns:
        The key.