VMAC stands for "Variable Message Authentication Code." It is a method for generating a message authentication code, a type of cryptographic checksum, that ensures the integrity and authenticity of a message. VMAC is designed to provide security against various cryptographic attacks while offering high performance. It uses a block cipher to process variable-length messages and produce a fixed-size authentication tag. This tag can be used to verify that the message has not been altered and comes from a legitimate sender.
package main
import (
"crypto/aes"
"fmt"
"log"
"github.com/pedroalbanese/vmac"
)
func main() {
// Example using the AES block cipher
key := []byte("0000000000000000")
nonce := []byte("00000000000000")
message := []byte("The quick brown fox jumps over the lazy dog.")
block, err := aes.NewCipher(key)
if err != nil {
log.Fatal(err)
}
// Create a new VMAC using the AES block cipher
mac, err := vmac.New(block, key, nonce, 16) // 16 is the VMAC size in bytes
if err != nil {
log.Fatal(err)
}
// Write the message to the VMAC
_, _ = mac.Write(message)
// Calculate the VMAC
calculatedVMAC := mac.Sum()
// Display the calculated VMAC
fmt.Printf("VMAC: %x\n", calculatedVMAC)
}Shamelessly taken from:
https://github.com/nicksnyder/vmac.go