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// Package: Crypto-PAn 1.0
// File: crypto.cpp
// Last Update: Aug 8, 2005
// Author: Jinliang Fan, David Stott (stott@lucent.com)
#include <string.h>
#include <stdlib.h>
#include "crypto.h"
#include <openssl/bio.h>
#include <openssl/err.h>
#include <iostream>
static BIO* bio_err = NULL;
static int Ciphersloaded = 0;
static BIO*
init_bio_err()
{
if (bio_err == NULL && (bio_err=BIO_new(BIO_s_file())) != NULL) {
BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);
ERR_load_crypto_strings();
}
return bio_err;
}
void
bio_err_print_errors()
{
init_bio_err();
ERR_print_errors( bio_err );
}
/**
* initializes ciphernames (i.e., calls OpenSSL_add_all_ciphers), if needed
*/
static void
init_ciphernames()
{
if ( Ciphersloaded == 0 ) {
OpenSSL_add_all_ciphers();
Ciphersloaded = 1;
}
}
Crypto::Crypto()
{
initialized = 0;
dir = 1;
if ( bio_err == NULL ) {
init_bio_err();
}
}
Crypto::Crypto( const char* _ciphername, const unsigned char* _key, const unsigned char* _iv )
{
initialized = 0;
dir = 1;
if ( SetCipher( _ciphername ) ) {
return;
}
SetKey( _key );
SetIV( _iv );
}
Crypto::~Crypto()
{
delete key;
key = NULL;
delete iv;
iv = NULL;
EVP_CIPHER_CTX_cleanup( &ctx );
}
int
Crypto::SetCipher( const char* _ciphername )
{
ciphername = strdup(_ciphername);
init_ciphernames();
/* finds cipher structure matching session key's ciphername */
if ( (cipher = EVP_get_cipherbyname( ciphername )) == NULL ) {
std::cerr << "Crypto::SetCipher(): Unable to understand cipher "<< ciphername << std::endl;
return -1;
}
initialized = 0;
return 0;
}
// void
// Crypto::Initialize()
// {
// if ( initialized == 0 ) {
// EVP_CIPHER_CTX_init( ctx );
// if ( EVP_CipherInit_ex( ctx, cipher, NULL, key, iv, dir ) != 1 ) {
// std::cerr << "Crypto::Initialize(): Error on EVP_CipherInit_ex" << std::endl;
// return;
// }
// initialized = 1;
// }
// }
void
Crypto::SetDir( int _dir )
{
dir = _dir;
}
void
Crypto::SetKey( const unsigned char* _key )
{
if ( _key != NULL ) {
key = new unsigned char[GetKeyLength()];
memcpy( key, _key, GetKeyLength() );
}
}
void
Crypto::SetIV( const unsigned char* _iv )
{
if ( _iv != NULL ) {
iv = new unsigned char[GetIVLength()];
memcpy( iv, _iv, GetIVLength() );
}
}
int
Crypto::EncryptInit(void)
{
EVP_CIPHER_CTX_init( &ctx );
if ( EVP_CipherInit_ex( &ctx, cipher, NULL, key, iv, dir ) != 1 ) {
std::cerr << "Crypto::Initialize(): Error on EVP_CipherInit_ex" << std::endl;
return -1;
}
initialized = 1;
return 0;
}
int
Crypto::EncryptUpdate( unsigned char *out, int &outl, const unsigned char *in, int inl )
{
if ( EVP_CipherUpdate( &ctx, out, &outl, in, inl ) == 0 ) {
std::cerr << "Crypto::CipherUpdate() failed" << std::endl;
return -1;
}
return 0;
}
int
Crypto::EncryptFinal( unsigned char *out, int &outl )
{
if ( EVP_CipherFinal_ex( &ctx, out, &outl ) == 0 ) {
std::cerr << "Crypto::EncryptFinal() failed" << std::endl;
return -1;
}
return 0;
}
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