diff --git a/core/cipher.go b/core/cipher.go
index 0246451a..10ea83c2 100644
--- a/core/cipher.go
+++ b/core/cipher.go
@@ -32,10 +32,10 @@ var aeadList = map[string]struct {
 	KeySize int
 	New     func([]byte) (shadowaead.Cipher, error)
 }{
-	"aes-128-gcm":            {16, shadowaead.AESGCM},
-	"aes-192-gcm":            {24, shadowaead.AESGCM},
-	"aes-256-gcm":            {32, shadowaead.AESGCM},
-	"chacha20-ietf-poly1305": {32, shadowaead.Chacha20IETFPoly1305},
+	"AEAD_AES_128_GCM":       {16, shadowaead.AESGCM},
+	"AEAD_AES_192_GCM":       {24, shadowaead.AESGCM},
+	"AEAD_AES_256_GCM":       {32, shadowaead.AESGCM},
+	"AEAD_CHACHA20_POLY1305": {32, shadowaead.Chacha20Poly1305},
 }
 
 // List of stream ciphers: key size in bytes and constructor
@@ -43,13 +43,13 @@ var streamList = map[string]struct {
 	KeySize int
 	New     func(key []byte) (shadowstream.Cipher, error)
 }{
-	"aes-128-ctr":   {16, shadowstream.AESCTR},
-	"aes-192-ctr":   {24, shadowstream.AESCTR},
-	"aes-256-ctr":   {32, shadowstream.AESCTR},
-	"aes-128-cfb":   {16, shadowstream.AESCFB},
-	"aes-192-cfb":   {24, shadowstream.AESCFB},
-	"aes-256-cfb":   {32, shadowstream.AESCFB},
-	"chacha20-ietf": {32, shadowstream.Chacha20IETF},
+	"AES-128-CTR":   {16, shadowstream.AESCTR},
+	"AES-192-CTR":   {24, shadowstream.AESCTR},
+	"AES-256-CTR":   {32, shadowstream.AESCTR},
+	"AES-128-CFB":   {16, shadowstream.AESCFB},
+	"AES-192-CFB":   {24, shadowstream.AESCFB},
+	"AES-256-CFB":   {32, shadowstream.AESCFB},
+	"CHACHA20-IETF": {32, shadowstream.Chacha20IETF},
 }
 
 // ListCipher returns a list of available cipher names sorted alphabetically.
@@ -67,10 +67,19 @@ func ListCipher() []string {
 
 // PickCipher returns a Cipher of the given name. Derive key from password if given key is empty.
 func PickCipher(name string, key []byte, password string) (Cipher, error) {
-	name = strings.ToLower(name)
+	name = strings.ToUpper(name)
 
-	if name == "dummy" {
+	switch name {
+	case "DUMMY":
 		return &dummy{}, nil
+	case "CHACHA20-IETF-POLY1305":
+		name = "AEAD_CHACHA20_POLY1305"
+	case "AES-128-GCM":
+		name = "AEAD_AES_128_GCM"
+	case "AES-196-GCM":
+		name = "AEAD_AES_196_GCM"
+	case "AES-256-GCM":
+		name = "AEAD_AES_256_GCM"
 	}
 
 	if choice, ok := aeadList[name]; ok {
diff --git a/main.go b/main.go
index ec6efbb9..3ae8b845 100644
--- a/main.go
+++ b/main.go
@@ -45,7 +45,7 @@ func main() {
 	}
 
 	flag.BoolVar(&config.Verbose, "verbose", false, "verbose mode")
-	flag.StringVar(&flags.Cipher, "cipher", "chacha20-ietf-poly1305", "available ciphers: "+strings.Join(core.ListCipher(), " "))
+	flag.StringVar(&flags.Cipher, "cipher", "AEAD_CHACHA20_POLY1305", "available ciphers: "+strings.Join(core.ListCipher(), " "))
 	flag.StringVar(&flags.Key, "key", "", "base64url-encoded key (derive from password if empty)")
 	flag.IntVar(&flags.Keygen, "keygen", 0, "generate a base64url-encoded random key of given length in byte")
 	flag.StringVar(&flags.Password, "password", "", "password")
diff --git a/shadowaead/cipher.go b/shadowaead/cipher.go
index a8112ae1..952d5b27 100644
--- a/shadowaead/cipher.go
+++ b/shadowaead/cipher.go
@@ -74,9 +74,9 @@ func AESGCM(psk []byte) (Cipher, error) {
 	return &metaCipher{psk: psk, makeAEAD: aesGCM}, nil
 }
 
-// Chacha20IETFPoly1305 creates a new Cipher with a pre-shared key. len(psk)
+// Chacha20Poly1305 creates a new Cipher with a pre-shared key. len(psk)
 // must be 32.
-func Chacha20IETFPoly1305(psk []byte) (Cipher, error) {
+func Chacha20Poly1305(psk []byte) (Cipher, error) {
 	if len(psk) != chacha20poly1305.KeySize {
 		return nil, KeySizeError(chacha20poly1305.KeySize)
 	}