Other Constants

If OPENSSL_RAW_DATA is set in the openssl_encrypt() or openssl_decrypt(), the returned data is returned as-is. When it is not specified, Base64 encoded data is returned to the caller.
By default encryption operations are padded using standard block padding and the padding is checked and removed when decrypting. If OPENSSL_ZERO_PADDING is set in the openssl_encrypt() or openssl_decrypt() options then no padding is performed, the total amount of data encrypted or decrypted must then be a multiple of the block size or an error will occur.
Indicates that encoding is S/MIME.
Indicates that encoding is DER (Distinguished Encoding Rules).
Indicates that encoding is PEM (Privacy-Enhanced Mail).
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