[GO] 解决：crypto/aes: invalid key size 14

// NewCipher creates and returns a new cipher.Block.
// The key argument should be the AES key,
// either 16, 24, or 32 bytes to select
// AES-128, AES-192, or AES-256.
func NewCipher(key []byte) (cipher.Block, error) {
    k := len(key)
    switch k {
    default:
        return nil, KeySizeError(k)
    case 16, 24, 32:
        break
    }
    return newCipher(key)
}