Exemple #1
0
        /// <summary>
        /// Converts a plain <paramref name="message"/> to a ciphertext
        /// which can be decrypted with the corresponding <see cref="PrivateKey"
        /// />.
        /// </summary>
        /// <param name="message">A binary data to be encrypted.</param>
        /// <returns>
        /// A ciphertext that was encrypted from the <paramref name="message"/>
        /// and can be decrypted with the corresponding <see cref="PrivateKey"
        /// />. (Although the word &#x201c;ciphertext&#x201d; has the word
        /// &#x201c;text&#x201d;, a returned ciphertext is not a Unicode
        /// <see cref="string"/>, but a <see cref="byte"/> array.)
        /// </returns>
        /// <seealso cref="PrivateKey.Decrypt(byte[])"/>
        public byte[] Encrypt(byte[] message)
        {
            PrivateKey disposablePrivateKey = new PrivateKey();

            byte[] aesKey = disposablePrivateKey.ExchangeKey(this);
            var    aes    = new Aesgcm(aesKey);

            return(aes.Encrypt(
                       message,
                       disposablePrivateKey.PublicKey.Format(true)
                       ));
        }
Exemple #2
0
        public byte[] Decrypt(byte[] ciphertext)
        {
            PublicKey pubKey = new PublicKey(ciphertext.Take(33).ToArray());

            byte[] aesKey = ExchangeKey(pubKey);
            var    aes    = new Aesgcm(aesKey);

            // FIXME: This merely returns null when the given ciphertext is
            // invalid (which means it is not encrypted with the corresponding
            // public key for the most part).  This should become to throw
            // an appropriate exception instead and also reflected to docs
            // comment (to add <exception> tag) as well.
            return(aes.Decrypt(ciphertext, 33));
        }