Package org.bouncycastle.crypto.kems

Class RSAKeyEncapsulation

  • All Implemented Interfaces:
    KeyEncapsulation
    public class RSAKeyEncapsulation
extends java.lang.Object
implements KeyEncapsulation
    The RSA Key Encapsulation Mechanism (RSA-KEM) from ISO 18033-2.

    • Constructor Detail

      • RSAKeyEncapsulation

        public RSAKeyEncapsulation​(DerivationFunction kdf,
                           java.security.SecureRandom rnd)
        Set up the RSA-KEM.
        Parameters:
        kdf - the key derivation function to be used.
        rnd - the random source for the session key.

    • Method Detail

      • init

        public void init​(CipherParameters key)
          throws java.lang.IllegalArgumentException
        Initialise the RSA-KEM.
        Specified by:
        init in interface KeyEncapsulation
        Parameters:
        key - the recipient's public (for encryption) or private (for decryption) key.
        Throws:
        java.lang.IllegalArgumentException

      • encrypt

        public CipherParameters encrypt​(byte[] out,
                                int outOff,
                                int keyLen)
                         throws java.lang.IllegalArgumentException
        Generate and encapsulate a random session key.
        Specified by:
        encrypt in interface KeyEncapsulation
        Parameters:
        out - the output buffer for the encapsulated key.
        outOff - the offset for the output buffer.
        keyLen - the length of the random session key.
        Returns:
        the random session key.
        Throws:
        java.lang.IllegalArgumentException

      • encrypt

        public CipherParameters encrypt​(byte[] out,
                                int keyLen)
        Generate and encapsulate a random session key.
        Parameters:
        out - the output buffer for the encapsulated key.
        keyLen - the length of the random session key.
        Returns:
        the random session key.

      • decrypt

        public CipherParameters decrypt​(byte[] in,
                                int inOff,
                                int inLen,
                                int keyLen)
                         throws java.lang.IllegalArgumentException
        Decrypt an encapsulated session key.
        Specified by:
        decrypt in interface KeyEncapsulation
        Parameters:
        in - the input buffer for the encapsulated key.
        inOff - the offset for the input buffer.
        inLen - the length of the encapsulated key.
        keyLen - the length of the session key.
        Returns:
        the session key.
        Throws:
        java.lang.IllegalArgumentException

      • decrypt

        public CipherParameters decrypt​(byte[] in,
                                int keyLen)
        Decrypt an encapsulated session key.
        Parameters:
        in - the input buffer for the encapsulated key.
        keyLen - the length of the session key.
        Returns:
        the session key.

      • generateKey

        protected KeyParameter generateKey​(java.math.BigInteger n,
                                   java.math.BigInteger r,
                                   int keyLen)