openssl_decrypt Decrypts data &reftitle.description; stringfalseopenssl_decrypt stringdata stringcipher_algo stringpassphrase intoptions0 stringiv"" stringtag"" stringaad"" Takes a raw or base64 encoded string and decrypts it using a given method and key. &reftitle.parameters; data The encrypted message to be decrypted. cipher_algo The cipher method. For a list of available cipher methods, use openssl_get_cipher_methods. passphrase The key. options options can be one of OPENSSL_RAW_DATA, OPENSSL_ZERO_PADDING. iv A non-NULL Initialization Vector. tag The authentication tag in AEAD cipher mode. If it is incorrect, the authentication fails and the function returns &false;. The length of the tag is not checked by the function. It is the caller's responsibility to ensure that the length of the tag matches the length of the tag retrieved when openssl_encrypt has been called. Otherwise the decryption may succeed if the given tag only matches the start of the proper tag. aad Additional authentication data. &reftitle.returnvalues; The decrypted string on success&return.falseforfailure;. &reftitle.errors; Emits an E_WARNING level error if an unknown cipher algorithm is passed via the cipher_algo parameter. Emits an E_WARNING level error if an empty value is passed in via the iv parameter. &reftitle.changelog; &Version; &Description; 7.1.0 The tag and aad parameters were added. &reftitle.seealso; openssl_encrypt