forked from quic-go/quic-go
c068cbcb8f
The example server now reads the certificate and key data itself. Tests use the new testdata package, where the sample key & cert are stored. Fixes #24
86 lines
2.2 KiB
Go
86 lines
2.2 KiB
Go
package crypto
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import (
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"bytes"
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"compress/flate"
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"compress/zlib"
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"crypto"
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"crypto/rand"
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"crypto/rsa"
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"crypto/sha256"
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"crypto/tls"
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"crypto/x509"
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"errors"
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"github.com/lucas-clemente/quic-go/utils"
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)
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// rsaSigner stores a key and a certificate for the server proof
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type rsaSigner struct {
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key *rsa.PrivateKey
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cert *x509.Certificate
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}
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// NewRSASigner loads the key and cert from files
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func NewRSASigner(tlsConfig *tls.Config) (Signer, error) {
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if len(tlsConfig.Certificates) == 0 {
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return nil, errors.New("Expected at least one certificate in TLS config")
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}
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cert := tlsConfig.Certificates[0]
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x509Cert, err := x509.ParseCertificate(cert.Certificate[0])
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if err != nil {
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return nil, err
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}
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rsaKey, ok := cert.PrivateKey.(*rsa.PrivateKey)
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if !ok {
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return nil, errors.New("Only RSA private keys are supported for now")
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}
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return &rsaSigner{key: rsaKey, cert: x509Cert}, nil
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}
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// SignServerProof signs CHLO and server config for use in the server proof
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func (kd *rsaSigner) SignServerProof(chlo []byte, serverConfigData []byte) ([]byte, error) {
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hash := sha256.New()
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if len(chlo) > 0 {
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// Version >= 31
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hash.Write([]byte("QUIC CHLO and server config signature\x00"))
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chloHash := sha256.Sum256(chlo)
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hash.Write([]byte{32, 0, 0, 0})
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hash.Write(chloHash[:])
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} else {
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hash.Write([]byte("QUIC server config signature\x00"))
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}
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hash.Write(serverConfigData)
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return rsa.SignPSS(rand.Reader, kd.key, crypto.SHA256, hash.Sum(nil), &rsa.PSSOptions{SaltLength: 32})
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}
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// GetCertCompressed gets the certificate in the format described by the QUIC crypto doc
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func (kd *rsaSigner) GetCertCompressed() []byte {
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b := &bytes.Buffer{}
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b.WriteByte(1) // Entry type compressed
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b.WriteByte(0) // Entry type end_of_list
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utils.WriteUint32(b, uint32(len(kd.cert.Raw)+4))
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gz, err := zlib.NewWriterLevelDict(b, flate.BestCompression, certDictZlib)
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if err != nil {
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panic(err)
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}
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lenCert := len(kd.cert.Raw)
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gz.Write([]byte{
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byte(lenCert & 0xff),
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byte((lenCert >> 8) & 0xff),
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byte((lenCert >> 16) & 0xff),
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byte((lenCert >> 24) & 0xff),
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})
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gz.Write(kd.cert.Raw)
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gz.Close()
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return b.Bytes()
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}
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// GetCertUncompressed gets the certificate in DER
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func (kd *rsaSigner) GetCertUncompressed() []byte {
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return kd.cert.Raw
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}
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