diff options
Diffstat (limited to 'src/protocol/internal/fqterm_ssh_des.cpp')
| -rw-r--r-- | src/protocol/internal/fqterm_ssh_des.cpp | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/src/protocol/internal/fqterm_ssh_des.cpp b/src/protocol/internal/fqterm_ssh_des.cpp new file mode 100644 index 0000000..603b6fe --- /dev/null +++ b/src/protocol/internal/fqterm_ssh_des.cpp @@ -0,0 +1,180 @@ +/*************************************************************************** + * fqterm, a terminal emulator for both BBS and *nix. * + * Copyright (C) 2008 fqterm development group. * + * * + * 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 program is distributed in the hope that it will be useful, * + * but WITHOUT ANY WARRANTY; without even the implied warranty of * + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * + * GNU General Public License for more details. * + * * + * You should have received a copy of the GNU General Public License * + * along with this program; if not, write to the * + * Free Software Foundation, Inc., * + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * + ***************************************************************************/ + +#include <memory.h> +#include <openssl/des.h> +#include <openssl/objects.h> +#include <openssl/evp.h> + +#include "fqterm_ssh_const.h" +#include "fqterm_ssh_des.h" +#include "fqterm_trace.h" + +namespace FQTerm { + +#define DES_ENCRYPT 1 +#define DES_DECRYPT 0 + +//============================================================================== +//FQTermSSH1DES3 +//============================================================================== + +FQTermSSH1DES3::FQTermSSH1DES3() { + d_name = "des3-cbc"; + + memset(d_IV1, 0, sizeof(d_IV1)); + memset(d_IV2, 0, sizeof(d_IV2)); + memset(d_IV3, 0, sizeof(d_IV3)); +} + +int FQTermSSH1DES3::blockSize() const { + return 8; +} + +void FQTermSSH1DES3::decrypt(const u_char *source, u_char *dest, int len) { + DES_ncbc_encrypt(source, dest, len, &d_key3, &d_IV3, DES_DECRYPT); + DES_ncbc_encrypt(dest, dest, len, &d_key2, &d_IV2, DES_ENCRYPT); + DES_ncbc_encrypt(dest, dest, len, &d_key1, &d_IV1, DES_DECRYPT); +} + +void FQTermSSH1DES3::encrypt(const u_char *source, u_char *dest, int len) { + DES_ncbc_encrypt(source, dest, len, &d_key1, &d_IV1, DES_ENCRYPT); + DES_ncbc_encrypt(dest, dest, len, &d_key2, &d_IV2, DES_DECRYPT); + DES_ncbc_encrypt(dest, dest, len, &d_key3, &d_IV3, DES_ENCRYPT); +} + +int FQTermSSH1DES3::getKeySize() const { + return 3*DES_KEY_SZ; +} + +int FQTermSSH1DES3::getIVSize() const { + return 0; +} + +void FQTermSSH1DES3::setIV(const u_char *data) { + memset(d_IV1, 0, sizeof(d_IV1)); + memset(d_IV2, 0, sizeof(d_IV2)); + memset(d_IV3, 0, sizeof(d_IV3)); +} + +void FQTermSSH1DES3::setKey(const u_char *data) { + DES_cblock key; + memset(key, 0, sizeof(key)); + memcpy(key, data, sizeof(key)); + DES_set_key(&key, &d_key1); + data += 8; + memset(key, 0, sizeof(key)); + memcpy(key, data, sizeof(key)); + DES_set_key(&key, &d_key2); + data += 8; + memset(key, 0, sizeof(key)); + memcpy(key, data, sizeof(key)); + DES_set_key(&key, &d_key3); +} + + +//================================================== +// TripleDES-CBC +//================================================== + +FQTermSSH2TripleDESCBC::FQTermSSH2TripleDESCBC() { + d_name = "des3-cbc"; + ctx_ = NULL; +} + +FQTermSSH2TripleDESCBC::~FQTermSSH2TripleDESCBC() { + if (ctx_ != NULL) { + EVP_CIPHER_CTX_cleanup(ctx_); + delete ctx_; + } +} + + +int FQTermSSH2TripleDESCBC::blockSize() const { + return 8; +} + +int FQTermSSH2TripleDESCBC::getKeySize() const { + return 24; +} + +int FQTermSSH2TripleDESCBC::getIVSize() const { + return 8; +} + +void FQTermSSH2TripleDESCBC::setIV(const u_char *data) { + memcpy(IV_, data, getIVSize()); +} + +void FQTermSSH2TripleDESCBC::setKey(const u_char *data) { + memcpy(key_, data, getKeySize()); +} + +void FQTermSSH2TripleDESCBC::encrypt(const u_char *source, u_char *dest, int len) { + FQ_TRACE("3DES_CBC", 9) << "Start encrypting"; + FQ_TRACE("3DES_CBC", 9) << "data len:" << len; + FQ_TRACE("3DES_CBC", 9) << "Source: \n" << dumpHexString << std::string((char *)source, len); + + int ret = 0; + if (ctx_ == NULL) { + // Lazy initialization. + ctx_ = new EVP_CIPHER_CTX; + EVP_CIPHER_CTX_init(ctx_); + ret = EVP_CipherInit(ctx_, EVP_des_ede3_cbc(), key_, IV_, 1); + FQ_VERIFY(ret == 1); + } + + ret = EVP_Cipher(ctx_, dest, source, len); + + FQ_VERIFY(ret == 1); + + FQ_TRACE("3DES_CBC", 9) << "Dest: \n" << dumpHexString << std::string((char *)dest, len); + + FQ_TRACE("3DES_CBC", 9) << "IV:\n" << dumpHexString << std::string((char *)IV_, getIVSize()); + FQ_TRACE("3DES_CBC", 9) << "key:\n" << dumpHexString << std::string((char *)key_, getKeySize()); + +} + +void FQTermSSH2TripleDESCBC::decrypt(const u_char *source, u_char *dest, int len) { + FQ_TRACE("3DES_CBC", 9) << "Start dencrypting"; + FQ_TRACE("3DES_CBC", 9) << "data len:" << len; + FQ_TRACE("3DES_CBC", 9) << "Source: \n" << dumpHexString << std::string((char *)source, len); + + int ret = 0; + if (ctx_ == NULL) { + // Lazy initialization. + ctx_ = new EVP_CIPHER_CTX; + EVP_CIPHER_CTX_init(ctx_); + ret = EVP_CipherInit(ctx_, EVP_des_ede3_cbc(), key_, IV_, 0); + FQ_VERIFY(ret == 1); + } + + ret = EVP_Cipher(ctx_, dest, source, len); + + FQ_VERIFY(ret == 1); + + FQ_TRACE("3DES_CBC", 9) << "Dest: \n" << dumpHexString << std::string((char *)dest, len); + + FQ_TRACE("3DES_CBC", 9) << "IV:\n" << dumpHexString << std::string((char *)IV_, getIVSize()); + FQ_TRACE("3DES_CBC", 9) << "key:\n" << dumpHexString << std::string((char *)key_, getKeySize()); +} + + +} // namespace FQTerm |