syntax = "proto2"; package legacy_pb; enum KeyType { UNKNOWN_PUBLIC_KEY_TYPE = 0; NIST256p = 1; NIST384p = 2; SECP256k1 = 3; } message Certificate { enum Version { UNKNOWN_VERSION = 0; _0_0_1 = 1; } required Version version = 1; required KeyType keyType = 2; required bytes publicKey = 4; }