Crypt_RC42: Encryption class for RC4 encryption for PHP 5
Crypt_RSA: Provides RSA-like key generation, encryption/decryption, signing and signature checking.
Users are strongly advised to migrate to phpseclib's Crypt_RSA; which is better maintained and less vulnerable to security issues.
Crypt_Xtea: A class that implements the Tiny Encryption Algorithm (TEA) (New Variant).
Crypt_XXTEA: An implementation of the XXTEA encryption algorithm. NOTICE: unregular default behavior.