openssl_public_decrypt Decrypts data with public key boolopenssl_public_decrypt stringdata stringdecrypted mixedkey intpadding &warn.experimental.func; openssl_public_decrypt decrypts data that was previous encrypted via openssl_private_encrypt and stores the result into decrypted. key must be the public key corresponding that was used to encrypt the data. padding defaults to OPENSSL_PKCS1_PADDING, but can also be OPENSSL_NO_PADDING. &return.success; You can use this function e.g. to check if the message was written by the owner of the private key. See also openssl_private_encrypt and openssl_private_decrypt.