NewCipher / NewTripleDESCipher
block, err := des.NewCipher(key8) // DES
block3, err := des.NewTripleDESCipher(key24) // 3DES
_ = block; _ = block3
// Combine with cipher.BlockMode (CBC) or cipher.Stream (CTR) — never raw ECB.crypto/des
DES and triple-DES block ciphers. BROKEN for modern security. Use AES.