use the new crypto/tls QUIC Transport (#3860)

internal/handshake/cipher_suite.go

@@ -0,0 +1,104 @@
+package handshake
+
+import (
+	"crypto"
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/tls"
+	"fmt"
+
+	"golang.org/x/crypto/chacha20poly1305"
+)
+
+// These cipher suite implementations are copied from the standard library crypto/tls package.
+
+const aeadNonceLength = 12
+
+type cipherSuite struct {
+	ID     uint16
+	Hash   crypto.Hash
+	KeyLen int
+	AEAD   func(key, nonceMask []byte) cipher.AEAD
+}
+
+func (s cipherSuite) IVLen() int { return aeadNonceLength }
+
+func getCipherSuite(id uint16) *cipherSuite {
+	switch id {
+	case tls.TLS_AES_128_GCM_SHA256:
+		return &cipherSuite{ID: tls.TLS_AES_128_GCM_SHA256, Hash: crypto.SHA256, KeyLen: 16, AEAD: aeadAESGCMTLS13}
+	case tls.TLS_CHACHA20_POLY1305_SHA256:
+		return &cipherSuite{ID: tls.TLS_CHACHA20_POLY1305_SHA256, Hash: crypto.SHA256, KeyLen: 32, AEAD: aeadChaCha20Poly1305}
+	case tls.TLS_AES_256_GCM_SHA384:
+		return &cipherSuite{ID: tls.TLS_AES_256_GCM_SHA384, Hash: crypto.SHA256, KeyLen: 32, AEAD: aeadAESGCMTLS13}
+	default:
+		panic(fmt.Sprintf("unknown cypher suite: %d", id))
+	}
+}
+
+func aeadAESGCMTLS13(key, nonceMask []byte) cipher.AEAD {
+	if len(nonceMask) != aeadNonceLength {
+		panic("tls: internal error: wrong nonce length")
+	}
+	aes, err := aes.NewCipher(key)
+	if err != nil {
+		panic(err)
+	}
+	aead, err := cipher.NewGCM(aes)
+	if err != nil {
+		panic(err)
+	}
+
+	ret := &xorNonceAEAD{aead: aead}
+	copy(ret.nonceMask[:], nonceMask)
+	return ret
+}
+
+func aeadChaCha20Poly1305(key, nonceMask []byte) cipher.AEAD {
+	if len(nonceMask) != aeadNonceLength {
+		panic("tls: internal error: wrong nonce length")
+	}
+	aead, err := chacha20poly1305.New(key)
+	if err != nil {
+		panic(err)
+	}
+
+	ret := &xorNonceAEAD{aead: aead}
+	copy(ret.nonceMask[:], nonceMask)
+	return ret
+}
+
+// xorNonceAEAD wraps an AEAD by XORing in a fixed pattern to the nonce
+// before each call.
+type xorNonceAEAD struct {
+	nonceMask [aeadNonceLength]byte
+	aead      cipher.AEAD
+}
+
+func (f *xorNonceAEAD) NonceSize() int        { return 8 } // 64-bit sequence number
+func (f *xorNonceAEAD) Overhead() int         { return f.aead.Overhead() }
+func (f *xorNonceAEAD) explicitNonceLen() int { return 0 }
+
+func (f *xorNonceAEAD) Seal(out, nonce, plaintext, additionalData []byte) []byte {
+	for i, b := range nonce {
+		f.nonceMask[4+i] ^= b
+	}
+	result := f.aead.Seal(out, f.nonceMask[:], plaintext, additionalData)
+	for i, b := range nonce {
+		f.nonceMask[4+i] ^= b
+	}
+
+	return result
+}
+
+func (f *xorNonceAEAD) Open(out, nonce, ciphertext, additionalData []byte) ([]byte, error) {
+	for i, b := range nonce {
+		f.nonceMask[4+i] ^= b
+	}
+	result, err := f.aead.Open(out, f.nonceMask[:], ciphertext, additionalData)
+	for i, b := range nonce {
+		f.nonceMask[4+i] ^= b
+	}
+
+	return result, err
+}