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diff --git a/nucleus/library/crypto/rsa_crypto.h b/nucleus/library/crypto/rsa_crypto.h
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+++ b/nucleus/library/crypto/rsa_crypto.h
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+#ifndef RSA_CRYPTO_CLASS
+#define RSA_CRYPTO_CLASS
+
+/*****************************************************************************\
+*                                                                             *
+*  Name   : RSA public key encryption                                         *
+*  Author : Chris Koeritz                                                     *
+*                                                                             *
+*******************************************************************************
+* Copyright (c) 2005-$now By Author.  This program is free software; you can  *
+* redistribute it and/or modify it under the terms of the GNU General Public  *
+* License as published by the Free Software Foundation; either version 2 of   *
+* the License or (at your option) any later version.  This is online at:      *
+*     http://www.fsf.org/copyleft/gpl.html                                    *
+* Please send any updates to: fred@gruntose.com                               *
+\*****************************************************************************/
+
+#include <basis/byte_array.h>
+#include <basis/contracts.h>
+
+// forward.
+struct rsa_st;
+
+namespace crypto {
+
+//! Supports public key encryption and decryption.
+/*!
+  This class uses the OpenSSL package's support for RSA encryption.
+*/
+
+class rsa_crypto : public virtual basis::nameable
+{
+public:
+  rsa_crypto(int key_size);
+    //!< constructs using a randomized private key of the "key_size".
+    /*!< the "key_size" must be at least 1024 bits for acceptable security.
+    smaller keys are considered insecure. */
+
+  rsa_crypto(const basis::byte_array &key);
+    //!< constructs with the specified "key" as our private key.
+    /*!< the "key" is used for encryption rather than generating a random one.
+    the key is only valid if it was created with this class.  also, if the key
+    is a public key, then only the public_encryption and public_decryption
+    methods will be available. */
+
+  rsa_crypto(rsa_st *key);
+    //!< starts with a pre-existing "key" in the low-level form.
+
+  rsa_crypto(const rsa_crypto &to_copy);
+
+  virtual ~rsa_crypto();
+
+  const rsa_crypto &operator = (const rsa_crypto &to_copy);
+
+  DEFINE_CLASS_NAME("rsa_crypto");
+
+  bool set_key(basis::byte_array &key);
+    //!< resets this object's key to "key".
+    /*!< the key is only valid if this class created it.  note: the "key"
+    is destructively consumed during the set method; do not pass in your
+    only copy. */
+
+  bool set_key(rsa_st *key);
+    //!< sets our new "key".
+    /*!< this must be a valid key created via the RSA algorithms. */
+
+  bool check_key(rsa_st *key);
+    //!< checks the RSA "key" provided for validity.
+
+  bool public_encrypt(const basis::byte_array &source, basis::byte_array &target) const;
+    //!< encrypts "source" using our public key and stores it in "target".
+    /*!< public_encrypt and private_decrypt are a pair.  an untrusted user can
+    encrypt with the public key and only the possessor of the private key
+    should be able to decrypt it. */
+  bool private_decrypt(const basis::byte_array &source, basis::byte_array &target) const;
+    //!< decrypts "source" using our private key and stores it in "target".
+
+  bool private_encrypt(const basis::byte_array &source, basis::byte_array &target) const;
+    //!< encrypts "source" using our private key and stores it in "target".
+    /*!< private_encrypt and public_decrypt are also a pair.  the trusted
+    user with the private key can create encrypted chunks that anyone with
+    the public key can decrypt. */
+  bool public_decrypt(const basis::byte_array &source, basis::byte_array &target) const;
+    //!< decrypts "source" using our public key and stores it in "target".
+
+  bool public_key(basis::byte_array &pubkey) const;
+    //!< makes a copy of the public key held here.
+  bool private_key(basis::byte_array &privkey) const;
+    //!< makes a copy of the private key held here.
+    /*!< the private key should never be exposed to anyone else. */
+
+  static rsa_st *generate_key(int key_size);
+    //!< creates a random RSA key using the lower-level openssl methods.
+
+private:
+  rsa_st *_key;  //!< our internal key.
+};
+
+} //namespace.
+
+#endif
+