crypto, only KeySize 32 is supported

[epcim]

What happened:

Can you explain why only key size = 32B is supported?
One would expect it will be at-least variable, thus can be override.

https://github.com/blend/go-sdk/blob/master/crypto/local_transit.go#L21

• the validation if len(decoded) != DefaultKeySize

// ParseKey parses a key from a string.
func ParseKey(key string) ([]byte, error) {
	decoded, err := hex.DecodeString(key)
	if err != nil {
		return nil, ex.New(err)
	}
	if len(decoded) != DefaultKeySize {
		return nil, ex.New("parse key; invalid key length")
	}
	return decoded, nil
}

[epcim]

// The key should be 16 bytes (AES-128), 24 bytes (AES-192) or 32 bytes (AES-256)