(PECL rnp >= 0.1.1)
rnp_locate_key — Search for the key
Note: only valid userids are checked while searching by userid.
ffi
The FFI object returned by rnp_ffi_create.
identifier_type
Identifier type string: "userid", "keyid", "fingerprint", "grip".
identifier
PGP User ID (name and email) for "userid" type, hexadecimal string that represents key id, fingerprint or key grip correspondingly.
Returns hexadecimal fingerprint of the key found on success 或者在失败时返回 false
.