use the mint default cookie protector to encrypt and decrypt cookies

internal/crypto/source_address_token.go

@@ -1,76 +0,0 @@
-package crypto
-
-import (
-	"crypto/aes"
-	"crypto/cipher"
-	"crypto/rand"
-	"crypto/sha256"
-	"fmt"
-	"io"
-
-	"golang.org/x/crypto/hkdf"
-)
-
-// StkSource is used to create and verify source address tokens
-type StkSource interface {
-	// NewToken creates a new token
-	NewToken([]byte) ([]byte, error)
-	// DecodeToken decodes a token
-	DecodeToken([]byte) ([]byte, error)
-}
-
-type stkSource struct {
-	aead cipher.AEAD
-}
-
-const stkKeySize = 16
-
-// Chrome currently sets this to 12, but discusses changing it to 16. We start
-// at 16 :)
-const stkNonceSize = 16
-
-// NewStkSource creates a source for source address tokens
-func NewStkSource() (StkSource, error) {
-	secret := make([]byte, 32)
-	if _, err := rand.Read(secret); err != nil {
-		return nil, err
-	}
-	key, err := deriveKey(secret)
-	if err != nil {
-		return nil, err
-	}
-	c, err := aes.NewCipher(key)
-	if err != nil {
-		return nil, err
-	}
-	aead, err := cipher.NewGCMWithNonceSize(c, stkNonceSize)
-	if err != nil {
-		return nil, err
-	}
-	return &stkSource{aead: aead}, nil
-}
-
-func (s *stkSource) NewToken(data []byte) ([]byte, error) {
-	nonce := make([]byte, stkNonceSize)
-	if _, err := rand.Read(nonce); err != nil {
-		return nil, err
-	}
-	return s.aead.Seal(nonce, nonce, data, nil), nil
-}
-
-func (s *stkSource) DecodeToken(p []byte) ([]byte, error) {
-	if len(p) < stkNonceSize {
-		return nil, fmt.Errorf("STK too short: %d", len(p))
-	}
-	nonce := p[:stkNonceSize]
-	return s.aead.Open(nil, nonce, p[stkNonceSize:], nil)
-}
-
-func deriveKey(secret []byte) ([]byte, error) {
-	r := hkdf.New(sha256.New, secret, nil, []byte("QUIC source address token key"))
-	key := make([]byte, stkKeySize)
-	if _, err := io.ReadFull(r, key); err != nil {
-		return nil, err
-	}
-	return key, nil
-}

internal/crypto/source_address_token_test.go

@@ -1,41 +0,0 @@
-package crypto
-
-import (
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-)
-
-var _ = Describe("Source Address Tokens", func() {
-	It("should generate the encryption key", func() {
-		Expect(deriveKey([]byte("TESTING"))).To(Equal([]byte{0xee, 0x71, 0x18, 0x9, 0xfd, 0xb8, 0x9a, 0x79, 0x19, 0xfc, 0x5e, 0x1a, 0x97, 0x20, 0xb2, 0x6}))
-	})
-
-	Context("tokens", func() {
-		var source *stkSource
-
-		BeforeEach(func() {
-			sourceI, err := NewStkSource()
-			source = sourceI.(*stkSource)
-			Expect(err).NotTo(HaveOccurred())
-		})
-
-		It("serializes", func() {
-			token, err := source.NewToken([]byte("foobar"))
-			Expect(err).ToNot(HaveOccurred())
-			data, err := source.DecodeToken(token)
-			Expect(err).ToNot(HaveOccurred())
-			Expect(data).To(Equal([]byte("foobar")))
-		})
-
-		It("rejects invalid tokens", func() {
-			_, err := source.DecodeToken([]byte("invalid source address token"))
-			Expect(err).To(HaveOccurred())
-			Expect(err.Error()).To(ContainSubstring("message authentication failed"))
-		})
-
-		It("rejects tokens of wrong size", func() {
-			_, err := source.DecodeToken(nil)
-			Expect(err).To(MatchError("STK too short: 0"))
-		})
-	})
-})