openssl_private_encrypt Encrypts data with private key &reftitle.description; boolopenssl_private_encrypt stringdata stringencrypted_data OpenSSLAsymmetricKeyOpenSSLCertificatearraystringprivate_key intpaddingOPENSSL_PKCS1_PADDING openssl_private_encrypt encrypts data with private private_key and stores the result into encrypted_data. Encrypted data can be decrypted via openssl_public_decrypt. This function can be used e.g. to sign data (or its hash) to prove that it is not written by someone else. &reftitle.parameters; data encrypted_data private_key padding padding can be one of OPENSSL_PKCS1_PADDING, OPENSSL_NO_PADDING. &reftitle.returnvalues; &return.success; &reftitle.changelog; &Version; &Description; 8.0.0 private_key accepts an OpenSSLAsymmetricKey or OpenSSLCertificate instance now; previously, a &resource; of type OpenSSL key or OpenSSL X.509 was accepted. &reftitle.seealso; openssl_public_encrypt openssl_public_decrypt