Function to decrypt an aes encrypted and base64 encoded string

go-decryption.go

func decrypter(crypto string, keyString string) string {
	paddedKey := fmt.Sprintf("%-16s", keyString) // 16 bytes
	key := []byte(paddedKey)

	bc, err := aes.NewCipher(key)
	if err != nil {
		fmt.Println(err)
	}

	src, _ := hex.DecodeString(crypto)

	var dst = make([]byte, len(src)) // final output array

	blockSize := bc.BlockSize()   // size of one block
	loops := len(src) / blockSize // number of times to loop

	// loop thru and decrypt each block
	for i := 0; i < loops; i++ {
		start := i * blockSize
		end := (i * blockSize) + blockSize
		bc.Decrypt(dst[start:end], src[start:end])
	}

	return string(dst)
}