ZF-12472: improve RSA functionality


This would break BC but phpseclib's Crypt_RSA seems much more feature packed then the RSA implementation in ZF. PEAR's own Crypt_RSA has deprecated itself in favor of phpseclib's implementation.

Among other features phpseclib's Crypt_RSA supports... more key formats, key conversion, PSS signing and OAEP encryption.


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