Migrating from Mcrypt to OpenSSL in PHP 7.2
The upcoming PHP 7.2 release will mark the deprecation of the Mcrypt extension, prompting developers to embrace the more secure OpenSSL alternative. This article examines the transition, particularly focusing on the challenges involved in preserving AES 256 CBC encryption and IVs.
Compatibility Concerns
The primary obstacle in the migration is the incompatible encryption algorithms. Mcrypt employs the Rijndael-256 algorithm, while OpenSSL supports AES-256, which is a variant of Rijndael-128 with a 256-bit key. Hence, the encryption cannot be directly converted without re-encrypting all data.
Security Considerations
The Mcrypt code provided in the question exhibits several vulnerabilities, including:
OpenSSL automatically applies PKCS#5 padding, but it is strongly recommended to adopt a robust encryption library like defuse/php-encryption, which offers additional protection and simplifies the process.
Implementation
To migrate to OpenSSL, consider the following steps:
By addressing these compatibility and security aspects, developers can seamlessly transition from Mcrypt to OpenSSL, ensuring the integrity and confidentiality of their sensitive data in PHP 7.2 and beyond.
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