diff --git a/datatype.go b/datatype.go
index a94067b..81a87e6 100644
--- a/datatype.go
+++ b/datatype.go
@@ -1,10 +1,11 @@
 package envconf
 
 import (
+	"fmt"
 	"time"
 )
 
-type DataType int
+type DataType uint
 
 const (
 	TypeNone      DataType = iota
@@ -15,12 +16,16 @@ const (
 	TypeDirectory DataType = iota
 	TypeBool      DataType = iota
 	TypeHex       DataType = iota
-	TypeHex16     DataType = iota
-	TypeHex32     DataType = iota
-	TypeHex64     DataType = iota
-	TypeHex128    DataType = iota
 )
 
+func FixedHex(size uint) DataType {
+	return (DataType)(size<<16) | TypeHex
+}
+
+func (dtype DataType) typeAndSize() (DataType, uint) {
+	return (dtype & 0xffff), uint(dtype >> 16)
+}
+
 type cValue struct {
 	dtype   DataType
 	intval  int64
@@ -32,18 +37,24 @@ type cValue struct {
 }
 
 func (dtype DataType) parse(key string, str string) (ret cValue) {
-	info, ok := tInfo[dtype]
+	rdtype, size := dtype.typeAndSize()
+	info, ok := tInfo[rdtype]
 	if ok {
-		ret = info.parser(key, str)
+		ret = info.parser(key, str, size)
 		if len(ret.binval) == 0 {
 			ret.binval = make([]byte, 0, 0)
 		}
 	}
 	return
 }
+
 func (dtype DataType) String() string {
-	info, ok := tInfo[dtype]
+	rdtype, size := dtype.typeAndSize()
+	info, ok := tInfo[rdtype]
 	if ok {
+		if size > 0 {
+			return fmt.Sprintf("%s%d", info.name, size)
+		}
 		return info.name
 	}
 	return "invalid"
diff --git a/envconf.go b/envconf.go
index ba3f150..6e2a538 100644
--- a/envconf.go
+++ b/envconf.go
@@ -324,36 +324,8 @@ func (c *Config) GetInt(key string) int64 {
 
 // Returns the value of an environment variable.
 // If the variable is not defined as envconf.TypeHex the function will return []byte{}.
-func (c *Config) GetHex(key string) []byte {
-	val := c.getRaw(key, TypeHex)
-	return val.binval
-}
-
-// Returns the value of an environment variable.
-// If the variable is not defined as envconf.TypeHex16 the function will return []byte{}.
-func (c *Config) GetHex16(key string) []byte {
-	val := c.getRaw(key, TypeHex16)
-	return val.binval
-}
-
-// Returns the value of an environment variable.
-// If the variable is not defined as envconf.TypeHex32 the function will return []byte{}.
-func (c *Config) GetHex32(key string) []byte {
-	val := c.getRaw(key, TypeHex32)
-	return val.binval
-}
-
-// Returns the value of an environment variable.
-// If the variable is not defined as envconf.TypeHex64 the function will return []byte{}.
-func (c *Config) GetHex64(key string) []byte {
-	val := c.getRaw(key, TypeHex64)
-	return val.binval
-}
-
-// Returns the value of an environment variable.
-// If the variable is not defined as envconf.TypeHex128 the function will return []byte{}.
-func (c *Config) GetHex128(key string) []byte {
-	val := c.getRaw(key, TypeHex128)
+func (c *Config) GetHex(key string, size int) []byte {
+	val := c.getRaw(key, FixedHex(uint(size)))
 	return val.binval
 }
 
@@ -428,41 +400,9 @@ func (c *Config) GetMapBool(key string) (retval map[string]bool) {
 	return
 }
 
-func (c *Config) GetMapHex(key string) (retval map[string][]byte) {
+func (c *Config) GetMapHex(key string, size int) (retval map[string][]byte) {
 	retval = make(map[string][]byte)
-	for k, v := range c.getRawMap(key, TypeHex) {
-		retval[k] = v.binval
-	}
-	return
-}
-
-func (c *Config) GetMapHex16(key string) (retval map[string][]byte) {
-	retval = make(map[string][]byte)
-	for k, v := range c.getRawMap(key, TypeHex16) {
-		retval[k] = v.binval
-	}
-	return
-}
-
-func (c *Config) GetMapHex32(key string) (retval map[string][]byte) {
-	retval = make(map[string][]byte)
-	for k, v := range c.getRawMap(key, TypeHex32) {
-		retval[k] = v.binval
-	}
-	return
-}
-
-func (c *Config) GetMapHex64(key string) (retval map[string][]byte) {
-	retval = make(map[string][]byte)
-	for k, v := range c.getRawMap(key, TypeHex64) {
-		retval[k] = v.binval
-	}
-	return
-}
-
-func (c *Config) GetMapHex128(key string) (retval map[string][]byte) {
-	retval = make(map[string][]byte)
-	for k, v := range c.getRawMap(key, TypeHex128) {
+	for k, v := range c.getRawMap(key, FixedHex(uint(size))) {
 		retval[k] = v.binval
 	}
 	return
diff --git a/parsers.go b/parsers.go
index 4bf34f8..1680095 100644
--- a/parsers.go
+++ b/parsers.go
@@ -11,7 +11,7 @@ import (
 	"time"
 )
 
-func parseInt(key string, str string) (ret cValue) {
+func parseInt(key string, str string, _ uint) (ret cValue) {
 	val, err := strconv.ParseInt(str, 10, 64)
 	if err == nil {
 		ret.intval = val
@@ -21,7 +21,7 @@ func parseInt(key string, str string) (ret cValue) {
 	return
 }
 
-func parseMetric(key string, str string) (ret cValue) {
+func parseMetric(key string, str string, _ uint) (ret cValue) {
 	mod := int64(1)
 	str = strings.ToUpper(str)
 	if strings.HasSuffix(str, "K") {
@@ -46,7 +46,7 @@ func parseMetric(key string, str string) (ret cValue) {
 	return
 }
 
-func parseDuration(key string, str string) (ret cValue) {
+func parseDuration(key string, str string, _ uint) (ret cValue) {
 	val, err := time.ParseDuration(str)
 	if err == nil {
 		ret.durval = val
@@ -56,7 +56,7 @@ func parseDuration(key string, str string) (ret cValue) {
 	return
 }
 
-func parseBool(key string, str string) (ret cValue) {
+func parseBool(key string, str string, _ uint) (ret cValue) {
 	val, err := strconv.ParseBool(str)
 	if err == nil {
 		ret.boolval = val
@@ -66,57 +66,21 @@ func parseBool(key string, str string) (ret cValue) {
 	return
 }
 
-func parseHex(key string, str string) (ret cValue) {
+func parseHex(key string, str string, size uint) (ret cValue) {
 	val, err := hex.DecodeString(str)
-	if err == nil {
+	if err == nil && (size == 0 || size == uint(len(val))) {
 		ret.binval = val
 	} else {
-		ret.err = errors.New(fmt.Sprintf(`Environment variable "%s" is not of type hex.`, key))
+		if size == 0 {
+			ret.err = errors.New(fmt.Sprintf(`Environment variable "%s" is not of type hex.`, key))
+		} else {
+			ret.err = errors.New(fmt.Sprintf(`Environment variable "%s" is not of type hex%d.`, key, size))
+		}
 	}
 	return
 }
 
-func parseHex16(key string, str string) (ret cValue) {
-	val, err := hex.DecodeString(str)
-	if err == nil && len(val) == 16 {
-		ret.binval = val
-	} else {
-		ret.err = errors.New(fmt.Sprintf(`Environment variable "%s" is not of type hex16.`, key))
-	}
-	return
-}
-
-func parseHex32(key string, str string) (ret cValue) {
-	val, err := hex.DecodeString(str)
-	if err == nil && len(val) == 32 {
-		ret.binval = val
-	} else {
-		ret.err = errors.New(fmt.Sprintf(`Environment variable "%s" is not of type hex32.`, key))
-	}
-	return
-}
-
-func parseHex64(key string, str string) (ret cValue) {
-	val, err := hex.DecodeString(str)
-	if err == nil && len(val) == 64 {
-		ret.binval = val
-	} else {
-		ret.err = errors.New(fmt.Sprintf(`Environment variable "%s" is not of type hex64.`, key))
-	}
-	return
-}
-
-func parseHex128(key string, str string) (ret cValue) {
-	val, err := hex.DecodeString(str)
-	if err == nil && len(val) == 128 {
-		ret.binval = val
-	} else {
-		ret.err = errors.New(fmt.Sprintf(`Environment variable "%s" is not of type hex128.`, key))
-	}
-	return
-}
-
-func parseDirectory(_ string, str string) (ret cValue) {
+func parseDirectory(_ string, str string, _ uint) (ret cValue) {
 	wd, err := os.Getwd()
 	if err == nil {
 		if path.IsAbs(str) {
@@ -130,7 +94,7 @@ func parseDirectory(_ string, str string) (ret cValue) {
 	return
 }
 
-func parseString(_ string, str string) (ret cValue) {
+func parseString(_ string, str string, _ uint) (ret cValue) {
 	ret.strval = str
 	return
 }
diff --git a/typeinfo.go b/typeinfo.go
index bc8cde1..0648ce8 100644
--- a/typeinfo.go
+++ b/typeinfo.go
@@ -1,7 +1,7 @@
 package envconf
 
 type dataTypeInfo struct {
-	parser func(string, string) cValue
+	parser func(string, string, uint) cValue
 	name   string
 }
 
@@ -16,11 +16,6 @@ func init() {
 	var dirInfo dataTypeInfo
 	var hexInfo dataTypeInfo
 
-	var hexInfo16 dataTypeInfo
-	var hexInfo32 dataTypeInfo
-	var hexInfo64 dataTypeInfo
-	var hexInfo128 dataTypeInfo
-
 	var boolInfo dataTypeInfo
 
 	intInfo.name = "int"
@@ -38,11 +33,6 @@ func init() {
 	strInfo.parser = parseString
 
 	hexInfo.parser = parseHex
-	hexInfo16.parser = parseHex16
-	hexInfo32.parser = parseHex32
-	hexInfo64.parser = parseHex64
-	hexInfo128.parser = parseHex128
-
 	boolInfo.parser = parseBool
 
 	tInfo[TypeInt] = intInfo
@@ -51,11 +41,5 @@ func init() {
 	tInfo[TypeString] = strInfo
 	tInfo[TypeDirectory] = dirInfo
 	tInfo[TypeHex] = hexInfo
-
-	tInfo[TypeHex16] = hexInfo16
-	tInfo[TypeHex32] = hexInfo32
-	tInfo[TypeHex64] = hexInfo64
-	tInfo[TypeHex128] = hexInfo128
-
 	tInfo[TypeBool] = boolInfo
 }