(PHP 5 >= 5.2.2, PHP 7) Exports a PKCS#12 Compatible Certificate Store File to variable.

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Free key resource

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Extract public key from certificate and prepare it for use

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Verify signature

(PHP 5 >= 5.2.2, PHP 7) Exports a PKCS#12 Compatible Certificate Store File

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Generate signature

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Return openSSL error message

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Encrypt an S/MIME message

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Generates a CSR

(PHP 5 >= 5.6.0, PHP 7) Exports a valid PEM formatted public key signed public key and challenge