privatekey.h

MiniSip Client with DomainKeys Authentication, Sip, Audio communications, Echo Cancel

#ifndef PRIVATEKEY_H_
#define PRIVATEKEY_H_

#include <libmcrypto/config.h>
#include <libmutil/Exception.h>
#include <openssl/pem.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <libmcrypto/OpenSSLUtil.h>
#include <string>
#include <iostream>
#include <fstream>


/**
 * This class represents a private key (RSA).
 * The implementation of this class referes to the openssl library.
 */
class LIBMCRYPTO_API PrivateKey{
	public:
		/**
		 * The constructor creates a new private key by opening it from a file.
		 * @param file Filename (whole path)
		 * @param passwd Password for private key
		 */
		PrivateKey(std::string file, std::string passwd);

		/**
		 * Destructor of PrivateKey
		 */
		~PrivateKey();

		/**
		 * This method creates a signature for the given data.
		 * The signing process is implemented with the openssl functions.
		 * @param data byte_t array with the data
		 * @param dataLength Length of the data
		 * @param signature byte_t array in which the signature is stored
		 * @param signatureLength Length of the signature
		 * @return boolean value if the signing was successful
		 */
		bool sign(byte_t* data, unsigned int dataLength, byte_t* signature, unsigned int& signatureLength);
		
		/**
		 * Static method to check if a given private key is password protected.
		 * @param file Filename (whole path)
		 * @return boolean value if the key is protected by password
		 */
		static bool needsPasswd(std::string file);

	private:
		/**
		 * openssl private key
		 */
		EVP_PKEY * privateKey;
};

class LIBMCRYPTO_API PrivateKeyException : public Exception{
	public:
		/**
		 * PrivateKey exception representing an exception withing the private key.
		 * @param desc Description of the exception
		 */
		PrivateKeyException(const char *desc) : Exception(desc) {};
};

#endif /*PRIVATEKEY_H_*/