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- /*
- * Copyright 2005 - 2016 Zarafa and its licensors
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License, version 3,
- * as published by the Free Software Foundation.
- *
- * 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 Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- *
- */
- #include <kopano/platform.h>
- #include <string>
- #include <kopano/stringutil.h>
- #include <kopano/charset/convert.h>
- #include <cassert>
- #include "SymmetricCrypt.h"
- namespace KC {
- /**
- * Check if the provided password is crypted.
- *
- * Crypted passwords have the format "{N}:<crypted password>, with N being the encryption algorithm.
- * Currently only algorithm number 1 and 2 are supported:
- * 1: base64-of-XOR-A5 of windows-1252 encoded data
- * 2: base64-of-XOR-A5 of UTF-8 encoded data
- *
- * @param[in] strCrypted
- * The string to test.
- *
- * @return boolean
- * @retval true The provided string was encrypted.
- * @retval false The provided string was not encrypted.
- */
- bool SymmetricIsCrypted(const char *c)
- {
- return strncmp(c, "{1}:", 4) == 0 || strncmp(c, "{2}:", 4) == 0;
- }
- /**
- * Check if the provided password is crypted.
- *
- * Crypted passwords have the format "{N}:<crypted password>, with N being the encryption algorithm.
- * Currently only algorithm number 1 and 2 are supported:
- * 1: base64-of-XOR-A5 of windows-1252 encoded data
- * 2: base64-of-XOR-A5 of UTF-8 encoded data
- *
- * @param[in] strCrypted
- * The wide character string to test.
- *
- * @return boolean
- * @retval true The provided string was encrypted.
- * @retval false The provided string was not encrypted.
- */
- bool SymmetricIsCrypted(const wchar_t *c)
- {
- return wcsncmp(c, L"{1}:", 4) == 0 || wcsncmp(c, L"{2}:", 4) == 0;
- }
- /**
- * Decrypt the crypt data.
- *
- * Depending on the N value, the password is decrypted using algorithm 1 or 2.
- *
- * @param[in] ulAlg
- * The number selecting the algorithm. (1 or 2)
- * @param[in] strXORed
- * The binary data to decrypt.
- *
- * @return The decrypted password encoded in UTF-8.
- */
- static std::string SymmetricDecryptBlob(unsigned int ulAlg, const std::string &strXORed)
- {
- std::string strRaw = strXORed;
- size_t z = strRaw.size();
-
- assert(ulAlg == 1 || ulAlg == 2);
- for (unsigned int i = 0; i < z; ++i)
- strRaw[i] ^= 0xA5;
-
- // Check the encoding algorithm. If it equals 1, the raw data is windows-1252.
- // Otherwise, it must be 2, which means it is already UTF-8.
- if (ulAlg == 1)
- strRaw = convert_to<std::string>("UTF-8", strRaw, rawsize(strRaw), "WINDOWS-1252");
-
- return strRaw;
- }
- /**
- * Decrypt an encrypted password.
- *
- * Depending on the N value, the password is decrypted using algorithm 1 or 2.
- *
- * @param[in] strCrypted
- * The UTF-8 encoded encrypted password to decrypt.
- *
- * @return THe decrypted password encoded in UTF-8.
- */
- std::string SymmetricDecrypt(const char *strCrypted)
- {
- if (!SymmetricIsCrypted(strCrypted))
- return "";
- // Length has been guaranteed to be >=4.
- return SymmetricDecryptBlob(strCrypted[1] - '0',
- base64_decode(convert_to<std::string>(strCrypted + 4)));
- }
- /**
- * Decrypt an encrypted password.
- *
- * Depending on the N value, the password is decrypted using algorithm 1 or 2.
- *
- * @param[in] strCrypted
- * The wide character encrypted password to decrypt.
- *
- * @return THe decrypted password encoded in UTF-8.
- */
- std::string SymmetricDecrypt(const wchar_t *wstrCrypted)
- {
- if (!SymmetricIsCrypted(wstrCrypted))
- return "";
- // Length has been guaranteed to be >=4.
- return SymmetricDecryptBlob(wstrCrypted[1] - '0',
- base64_decode(convert_to<std::string>(wstrCrypted + 4)));
- }
- } /* namespace */
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