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// cryptopasta - basic cryptography examples
//
// Written in 2015 by George Tankersley <george.tankersley@gmail.com>
//
// To the extent possible under law, the author(s) have dedicated all copyright
// and related and neighboring rights to this software to the public domain
// worldwide. This software is distributed without any warranty.
//
// You should have received a copy of the CC0 Public Domain Dedication along
// with this software. If not, see // <http://creativecommons.org/publicdomain/zero/1.0/>.
package cryptopasta
import (
"bytes"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"encoding/hex"
"testing"
)
// https://groups.google.com/d/msg/sci.crypt/OolWgsgQD-8/jHciyWkaL0gJ
var hmacTests = []struct {
key string
data string
digest string
}{
{
key: "0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b",
data: "4869205468657265", // "Hi There"
digest: "9f9126c3d9c3c330d760425ca8a217e31feae31bfe70196ff81642b868402eab",
},
{
key: "4a656665", // "Jefe"
data: "7768617420646f2079612077616e7420666f72206e6f7468696e673f", // "what do ya want for nothing?"
digest: "6df7b24630d5ccb2ee335407081a87188c221489768fa2020513b2d593359456",
},
}
func TestHMAC(t *testing.T) {
for idx, tt := range hmacTests {
keySlice, _ := hex.DecodeString(tt.key)
dataBytes, _ := hex.DecodeString(tt.data)
expectedDigest, _ := hex.DecodeString(tt.digest)
keyBytes := &[32]byte{}
copy(keyBytes[:], keySlice)
macDigest := GenerateHMAC(dataBytes, keyBytes)
if !bytes.Equal(macDigest, expectedDigest) {
t.Errorf("test %d generated unexpected mac", idx)
}
}
}
func TestSign(t *testing.T) {
message := []byte("Hello, world!")
key, err := NewSigningKey()
if err != nil {
t.Error(err)
return
}
signature, err := Sign(message, key)
if err != nil {
t.Error(err)
return
}
if !Verify(message, signature, &key.PublicKey) {
t.Error("signature was not correct")
return
}
message[0] ^= 0xff
if Verify(message, signature, &key.PublicKey) {
t.Error("signature was good for altered message")
}
}
func TestSignWithP384(t *testing.T) {
message := []byte("Hello, world!")
key, err := ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
if err != nil {
t.Error(err)
return
}
signature, err := Sign(message, key)
if err != nil {
t.Error(err)
return
}
if !Verify(message, signature, &key.PublicKey) {
t.Error("signature was not correct")
return
}
message[0] ^= 0xff
if Verify(message, signature, &key.PublicKey) {
t.Error("signature was good for altered message")
}
}
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