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/lib/classes/ -> encryption.php (source)
Differences Between: [Versions 311 and 403]
Class used to encrypt or decrypt data.
| Copyright: | 2020 The Open University |
| License: | http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later |
| File Size: | 323 lines (12 kb) |
| Included or required: | 0 times |
| Referenced: | 0 times |
| Includes or requires: | 0 files |
Defines 1 class
encryption:: (10 methods):
is_sodium_installed()
get_encryption_method()
create_key()
get_key_folder()
get_key_file()
key_exists()
get_key()
get_iv_length()
encrypt()
decrypt()
Class: encryption - X-Ref
Class used to encrypt or decrypt data.| is_sodium_installed() X-Ref |
| Checks if Sodium is installed. return: bool True if the Sodium extension is available |
| get_encryption_method() X-Ref |
| Gets the encryption method to use. We use the Sodium extension if it is installed, or otherwise, OpenSSL. return: string Current encryption method |
| create_key(?string $method = null, bool $chmod = true) X-Ref |
| Creates a key for the server. param: string|null $method Encryption method (only if you want to create a non-default key) param: bool $chmod If true, restricts the file access of the key |
| get_key_folder() X-Ref |
| Gets the folder used to store the secret key. return: string Folder path |
| get_key_file(?string $method = null) X-Ref |
| Gets the file path used to store the secret key. The filename contains the cipher method, so that if necessary to transition in future it would be possible to have multiple. param: string|null $method Encryption method (only if you want to get a non-default key) return: string Full path to file |
| key_exists(?string $method = null) X-Ref |
| Checks if there is a key file. param: string|null $method Encryption method (only if you want to check a non-default key) return: bool True if there is a key file |
| get_key(?string $method = null) X-Ref |
| Gets the current key, automatically creating it if there isn't one yet. param: string|null $method Encryption method (only if you want to get a non-default key) return: string The key (binary) |
| get_iv_length(string $method) X-Ref |
| Gets the length in bytes of the initial values data required. param: string $method Crypto method return: int Length in bytes |
| encrypt(string $data, ?string $method = null) X-Ref |
| Encrypts data using the server's key. Note there is a special case - the empty string is not encrypted. param: string $data Data to encrypt, or empty string for no data param: string|null $method Encryption method (only if you want to use a non-default method) return: string Encrypted data, or empty string for no data |
| decrypt(string $data) X-Ref |
| Decrypts data using the server's key. The decryption works with either supported method. param: string $data Data to decrypt return: string Decrypted data |
