(PECL rnp >= 0.1.1)
rnp_decrypt — Decrypt PGP message
Private keys used for decryption should be loaded into the FFI object before calling this function. If password encryption was used, then password provider should be set by calling rnp_ffi_set_pass_provider().
ffiinput
Decrypted message on success 或者在失败时返回 false.