I have a windows application (Visual Studio is used) that uses Microsoft CryptoAPI. Now it is required to develop a Mac OS X application, that is capable to read data, encrypted by the WinApp, and encrypt data on Mac OS X, that will be decrypted by the WinApp. Encryption/decription in the WinApp initialized in the such way:
::CryptAcquireContext(&m_hCryptProv, NULL, MS_DEF_PROV, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT);
::CryptCreateHash(m_hCryptProv, CALG_MD5, 0, 0, &m_hCryptHash);
::CryptHashData(m_hCryptHash, pbtPSW, dwPSWLen, 0);
::CryptDeriveKey(m_hCryptProv, CALG_RC4, m_hCryptHash, 0, &m_hCryptKey);
And for encryption/decription the following is used:
::CryptEncrypt(m_hCryptKey, 0, TRUE, 0, pBuf, &dwCnt, dwLen);
::CryptDecrypt(m_hCryptKey, 0, TRUE, 0, pBuf, &dwCnt);
As I understand, I need to find a library that implements MD5 hashing plus RC4 encoding/decoding. It seems that there are a number of such libraries. For example: matrixSSL, OpenSSL. But using of the libraries for my puproses is not obvious (especially taking into account, that I am not familiar with Sequrity/Crypting APIs). Could somebody recommend a particular ciphering library? May be there are code examples for my task?
ADDITION:
It seems the main problem is that I need a portable analog of the ::CryptDeriveKey, that is compatible with Microsoft version (i.e. generates the same key). Does anybody know a such one? Or an algorithm of creating a key by the ::CryptDeriveKey?
I would recommend taking a look at the CyaSSL embedded SSL library. It supports the current standards up to TLS 1.2 and is very portable across operating systems. In particular, CyaSSL includes the CTaoCrypt cryptographic library which should let you perform the crypto operations you're looking for.
Some helpful documentation links for CyaSSL:
CTaoCrypt Usage Reference: http://yassl.com/yaSSL/Docs_CTaoCrypt_Usage_Reference.html
CyaSSL Docs Page: http://yassl.com/yaSSL/Docs.html
If you download CyaSSL, you'll find a Visual Studio project file to take a look at as well.
Regards,
Chris