package crypto import ( "bytes" "encoding/hex" "testing" ) // test vectors from http://cr.yp.to/mac/poly1305-20050329.pdf var poly1305Tests = []struct { msg []byte r []byte k []byte nonce []byte mac []byte }{ { []byte("\xf3\xf6"), []byte("\x85\x1f\xc4\x0c\x34\x67\xac\x0b\xe0\x5c\xc2\x04\x04\xf3\xf7\x00"), []byte("\xec\x07\x4c\x83\x55\x80\x74\x17\x01\x42\x5b\x62\x32\x35\xad\xd6"), []byte("\xfb\x44\x73\x50\xc4\xe8\x68\xc5\x2a\xc3\x27\x5c\xf9\xd4\x32\x7e"), []byte("\xf4\xc6\x33\xc3\x04\x4f\xc1\x45\xf8\x4f\x33\x5c\xb8\x19\x53\xde"), }, { []byte(""), []byte("\xa0\xf3\x08\x00\x00\xf4\x64\x00\xd0\xc7\xe9\x07\x6c\x83\x44\x03"), []byte("\x75\xde\xaa\x25\xc0\x9f\x20\x8e\x1d\xc4\xce\x6b\x5c\xad\x3f\xbf"), []byte("\x61\xee\x09\x21\x8d\x29\xb0\xaa\xed\x7e\x15\x4a\x2c\x55\x09\xcc"), []byte("\xdd\x3f\xab\x22\x51\xf1\x1a\xc7\x59\xf0\x88\x71\x29\xcc\x2e\xe7"), }, { []byte("\x66\x3c\xea\x19\x0f\xfb\x83\xd8\x95\x93\xf3\xf4\x76\xb6\xbc\x24\xd7\xe6\x79\x10\x7e\xa2\x6a\xdb\x8c\xaf\x66\x52\xd0\x65\x61\x36"), []byte("\x48\x44\x3d\x0b\xb0\xd2\x11\x09\xc8\x9a\x10\x0b\x5c\xe2\xc2\x08"), []byte("\x6a\xcb\x5f\x61\xa7\x17\x6d\xd3\x20\xc5\xc1\xeb\x2e\xdc\xdc\x74"), []byte("\xae\x21\x2a\x55\x39\x97\x29\x59\x5d\xea\x45\x8b\xc6\x21\xff\x0e"), []byte("\x0e\xe1\xc1\x6b\xb7\x3f\x0f\x4f\xd1\x98\x81\x75\x3c\x01\xcd\xbe"), }, { []byte("\xab\x08\x12\x72\x4a\x7f\x1e\x34\x27\x42\xcb\xed\x37\x4d\x94\xd1\x36\xc6\xb8\x79\x5d\x45\xb3\x81\x98\x30\xf2\xc0\x44\x91\xfa\xf0\x99\x0c\x62\xe4\x8b\x80\x18\xb2\xc3\xe4\xa0\xfa\x31\x34\xcb\x67\xfa\x83\xe1\x58\xc9\x94\xd9\x61\xc4\xcb\x21\x09\x5c\x1b\xf9"), []byte("\x12\x97\x6a\x08\xc4\x42\x6d\x0c\xe8\xa8\x24\x07\xc4\xf4\x82\x07"), []byte("\xe1\xa5\x66\x8a\x4d\x5b\x66\xa5\xf6\x8c\xc5\x42\x4e\xd5\x98\x2d"), []byte("\x9a\xe8\x31\xe7\x43\x97\x8d\x3a\x23\x52\x7c\x71\x28\x14\x9e\x3a"), []byte("\x51\x54\xad\x0d\x2c\xb2\x6e\x01\x27\x4f\xc5\x11\x48\x49\x1f\x1b"), }, } func TestPoly1305(t *testing.T) { for _, test := range poly1305Tests { key := &MACKey{} copy(key.K[:], test.k) copy(key.R[:], test.r) mac := poly1305MAC(test.msg, test.nonce, key) if !bytes.Equal(mac, test.mac) { t.Fatalf("wrong mac calculated, want: %02x, got: %02x", test.mac, mac) } if !poly1305Verify(test.msg, test.nonce, key, test.mac) { t.Fatalf("mac does not verify: mac: %02x", test.mac) } } } var testValues = []struct { ekey EncryptionKey skey MACKey ciphertext []byte plaintext []byte }{ { ekey: decodeArray32("303e8687b1d7db18421bdc6bb8588ccadac4d59ee87b8ff70c44e635790cafef"), skey: MACKey{ K: decodeArray16("ef4d8824cb80b2bcc5fbff8a9b12a42c"), R: decodeArray16("cc8d4b948ee0ebfe1d415de921d10353"), }, ciphertext: decodeHex("69fb41c62d12def4593bd71757138606338f621aeaeb39da0fe4f99233f8037a54ea63338a813bcf3f75d8c3cc75dddf8750"), plaintext: []byte("Dies ist ein Test!"), }, } func decodeArray16(s string) (dst [16]byte) { data := decodeHex(s) if len(data) != 16 { panic("data has wrong length") } copy(dst[:], data) return } func decodeArray32(s string) (dst [32]byte) { data := decodeHex(s) if len(data) != 32 { panic("data has wrong length") } copy(dst[:], data) return } // decodeHex decodes the string s and panics on error. func decodeHex(s string) []byte { d, err := hex.DecodeString(s) if err != nil { panic(err) } return d } func TestCrypto(t *testing.T) { msg := make([]byte, 0, 8*1024*1024) // use 8MiB for now for _, tv := range testValues { // test encryption k := &Key{ EncryptionKey: tv.ekey, MACKey: tv.skey, } msg, err := k.Encrypt(msg, tv.plaintext) if err != nil { t.Fatal(err) } // decrypt message buf := make([]byte, len(tv.plaintext)) n, err := k.Decrypt(buf, msg) if err != nil { t.Fatal(err) } buf = buf[:n] // change mac, this must fail msg[len(msg)-8] ^= 0x23 if _, err = k.Decrypt(buf, msg); err != ErrUnauthenticated { t.Fatal("wrong MAC value not detected") } // reset mac msg[len(msg)-8] ^= 0x23 // tamper with message, this must fail msg[16+5] ^= 0x85 if _, err = k.Decrypt(buf, msg); err != ErrUnauthenticated { t.Fatal("tampered message not detected") } // test decryption p := make([]byte, len(tv.ciphertext)) n, err = k.Decrypt(p, tv.ciphertext) if err != nil { t.Fatal(err) } p = p[:n] if !bytes.Equal(p, tv.plaintext) { t.Fatalf("wrong plaintext: expected %q but got %q\n", tv.plaintext, p) } } }