Crypto++ does not have an interface for encrypting with the private key.
This is not a useful cryptographic operation, since the public key is by
definition public and so anyone would be able to decrypt your message.
Perhaps what you're thinking is signing with the private key, in which
case you might want to look at the sample code for signing.
On Wed, Feb 12, 2003 at 11:19:21PM +0100, siegfried rohrendorf wrote:
> the sample-code in crypto++5.0 (test.cpp) nearly has
> all i need... but i want to encrypt a message using a
> private key (and decrypt with the public).
> how can i change this simple code-snippets to encrypt
> with private and decrypt with the public key?
> i am used somewhat used to c++, read the documentation
> and spent some days wiht the source, but.. (its really
> hardcode c++, looks to me if c++ was used to encrypt
> the code:).
>
> can someone help?
>
> yes: i know that this is not the common thing you are
> expected to do with rsa, but i need it in an
> environment where it definitly makes (would make if
> you can help me:) sense.
>
> string RSAEncryptString(const char *pubFilename, const
> char *seed, const
> char *message)
>
> {
> FileSource pubFile(pubFilename, true, new
> HexDecoder);
> RSAES_OAEP_SHA_Encryptor pub(pubFile);
>
> RandomPool randPool;
> randPool.Put((byte *)seed, strlen(seed));
>
> string result;
> StringSource(message, true, new
> PK_EncryptorFilter(randPool, pub, new
> HexEncoder(new StringSink(result))));
> return result;
> }
>
> string RSADecryptString(const char *privFilename,
> const char *ciphertext)
> {
> FileSource privFile(privFilename, true, new
> HexDecoder);
> RSAES_OAEP_SHA_Decryptor priv(privFile);
>
> string result;
> StringSource(ciphertext, true, new HexDecoder(new
> PK_DecryptorFilter(priv,
> new StringSink(result))));
> return result;
> }
>
>
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