Predefined Constants

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- Purpose checking flags »

- PHP Manual
- OpenSSL
- Predefined Constants

# Predefined Constants

## Table of Contents

- Purpose checking flags
- Padding flags for asymmetric encryption
- Key types
- PKCS7 Flags/Constants
- CMS Flags/Constants
- Signature Algorithms
- Ciphers
- Version constants
- Server Name Indication constants
- Other Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.