geheim

var (
	ErrKey    = errors.New("geheim: empty key")
	ErrHeader = errors.New("geheim: malformed header")
	ErrSign   = errors.New("geheim: signature verification failed")

	ErrCipher = fmt.Errorf("geheim: invalid %s (%s)", CipherDesc, CipherString)
	ErrMode   = fmt.Errorf("geheim: invalid %s (%s)", ModeDesc, ModeString)
	ErrKDF    = fmt.Errorf("geheim: invalid %s (%s)", KDFDesc, KDFString)
	ErrMAC    = fmt.Errorf("geheim: invalid %s (%s)", MACDesc, MACString)
	ErrMD     = fmt.Errorf("geheim: invalid %s (%s)", MDDesc, MDString)
	ErrSec    = fmt.Errorf("geheim: invalid %s (%d~%d)", SecDesc, MinSec, MaxSec)
)

var (
	MetaSize   = int64(binary.Size(meta))
	HeaderSize = int64(binary.Size(header))
	Overhead   = MetaSize + HeaderSize
)

var CipherNames = map[Cipher]string{
	AES_256:  "AES-256",
	ChaCha20: "ChaCha20",
}

var CipherString = getOptionString(ciphers[:], CipherNames)

var KDFNames = map[KDF]string{
	HKDF:     "HKDF",
	Argon2id: "Argon2id",
	Scrypt:   "Scrypt",
}

var KDFString = getOptionString(kdfs[:], KDFNames)

var MACNames = map[MAC]string{
	HMAC: "HMAC",
}

var MACString = getOptionString(macs[:], MACNames)

var MDNames = map[MD]string{
	SHA3_224:    "SHA3-224",
	SHA3_256:    "SHA3-256",
	SHA3_384:    "SHA3-384",
	SHA3_512:    "SHA3-512",
	SHA_224:     "SHA-224",
	SHA_256:     "SHA-256",
	SHA_384:     "SHA-384",
	SHA_512:     "SHA-512",
	SHA_512_224: "SHA-512/224",
	SHA_512_256: "SHA-512/256",
	BLAKE2b_256: "BLAKE2b-256",
	BLAKE2b_384: "BLAKE2b-384",
	BLAKE2b_512: "BLAKE2b-512",
}

var MDString = getOptionString(mds[:], MDNames)

var ModeNames = map[Mode]string{
	CTR: "CTR",
	CFB: "CFB",
	OFB: "OFB",
}

var ModeString = getOptionString(modes[:], ModeNames)