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添加 github.com/pion/dtls 代码
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bjdgyc
221
dtls-2.0.9/crypto.go
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221
dtls-2.0.9/crypto.go
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@@ -0,0 +1,221 @@
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package dtls
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import (
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"crypto"
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"crypto/ecdsa"
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"crypto/ed25519"
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"crypto/rand"
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"crypto/rsa"
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"crypto/sha256"
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"crypto/x509"
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"encoding/asn1"
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"encoding/binary"
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"math/big"
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"time"
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"github.com/pion/dtls/v2/pkg/crypto/elliptic"
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"github.com/pion/dtls/v2/pkg/crypto/hash"
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)
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type ecdsaSignature struct {
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R, S *big.Int
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}
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func valueKeyMessage(clientRandom, serverRandom, publicKey []byte, namedCurve elliptic.Curve) []byte {
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serverECDHParams := make([]byte, 4)
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serverECDHParams[0] = 3 // named curve
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binary.BigEndian.PutUint16(serverECDHParams[1:], uint16(namedCurve))
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serverECDHParams[3] = byte(len(publicKey))
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plaintext := []byte{}
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plaintext = append(plaintext, clientRandom...)
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plaintext = append(plaintext, serverRandom...)
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plaintext = append(plaintext, serverECDHParams...)
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plaintext = append(plaintext, publicKey...)
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return plaintext
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}
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// If the client provided a "signature_algorithms" extension, then all
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// certificates provided by the server MUST be signed by a
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// hash/signature algorithm pair that appears in that extension
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//
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// https://tools.ietf.org/html/rfc5246#section-7.4.2
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func generateKeySignature(clientRandom, serverRandom, publicKey []byte, namedCurve elliptic.Curve, privateKey crypto.PrivateKey, hashAlgorithm hash.Algorithm) ([]byte, error) {
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msg := valueKeyMessage(clientRandom, serverRandom, publicKey, namedCurve)
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switch p := privateKey.(type) {
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case ed25519.PrivateKey:
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// https://crypto.stackexchange.com/a/55483
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return p.Sign(rand.Reader, msg, crypto.Hash(0))
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case *ecdsa.PrivateKey:
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hashed := hashAlgorithm.Digest(msg)
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return p.Sign(rand.Reader, hashed, hashAlgorithm.CryptoHash())
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case *rsa.PrivateKey:
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hashed := hashAlgorithm.Digest(msg)
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return p.Sign(rand.Reader, hashed, hashAlgorithm.CryptoHash())
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}
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return nil, errKeySignatureGenerateUnimplemented
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}
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func verifyKeySignature(message, remoteKeySignature []byte, hashAlgorithm hash.Algorithm, rawCertificates [][]byte) error { //nolint:dupl
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if len(rawCertificates) == 0 {
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return errLengthMismatch
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}
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certificate, err := x509.ParseCertificate(rawCertificates[0])
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if err != nil {
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return err
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}
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switch p := certificate.PublicKey.(type) {
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case ed25519.PublicKey:
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if ok := ed25519.Verify(p, message, remoteKeySignature); !ok {
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return errKeySignatureMismatch
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}
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return nil
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case *ecdsa.PublicKey:
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ecdsaSig := &ecdsaSignature{}
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if _, err := asn1.Unmarshal(remoteKeySignature, ecdsaSig); err != nil {
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return err
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}
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if ecdsaSig.R.Sign() <= 0 || ecdsaSig.S.Sign() <= 0 {
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return errInvalidECDSASignature
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}
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hashed := hashAlgorithm.Digest(message)
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if !ecdsa.Verify(p, hashed, ecdsaSig.R, ecdsaSig.S) {
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return errKeySignatureMismatch
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}
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return nil
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case *rsa.PublicKey:
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switch certificate.SignatureAlgorithm {
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case x509.SHA1WithRSA, x509.SHA256WithRSA, x509.SHA384WithRSA, x509.SHA512WithRSA:
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hashed := hashAlgorithm.Digest(message)
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return rsa.VerifyPKCS1v15(p, hashAlgorithm.CryptoHash(), hashed, remoteKeySignature)
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default:
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return errKeySignatureVerifyUnimplemented
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}
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}
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return errKeySignatureVerifyUnimplemented
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}
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// If the server has sent a CertificateRequest message, the client MUST send the Certificate
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// message. The ClientKeyExchange message is now sent, and the content
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// of that message will depend on the public key algorithm selected
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// between the ClientHello and the ServerHello. If the client has sent
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// a certificate with signing ability, a digitally-signed
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// CertificateVerify message is sent to explicitly verify possession of
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// the private key in the certificate.
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// https://tools.ietf.org/html/rfc5246#section-7.3
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func generateCertificateVerify(handshakeBodies []byte, privateKey crypto.PrivateKey, hashAlgorithm hash.Algorithm) ([]byte, error) {
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h := sha256.New()
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if _, err := h.Write(handshakeBodies); err != nil {
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return nil, err
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}
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hashed := h.Sum(nil)
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switch p := privateKey.(type) {
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case ed25519.PrivateKey:
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// https://crypto.stackexchange.com/a/55483
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return p.Sign(rand.Reader, hashed, crypto.Hash(0))
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case *ecdsa.PrivateKey:
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return p.Sign(rand.Reader, hashed, hashAlgorithm.CryptoHash())
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case *rsa.PrivateKey:
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return p.Sign(rand.Reader, hashed, hashAlgorithm.CryptoHash())
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}
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return nil, errInvalidSignatureAlgorithm
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}
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func verifyCertificateVerify(handshakeBodies []byte, hashAlgorithm hash.Algorithm, remoteKeySignature []byte, rawCertificates [][]byte) error { //nolint:dupl
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if len(rawCertificates) == 0 {
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return errLengthMismatch
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}
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certificate, err := x509.ParseCertificate(rawCertificates[0])
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if err != nil {
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return err
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}
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switch p := certificate.PublicKey.(type) {
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case ed25519.PublicKey:
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if ok := ed25519.Verify(p, handshakeBodies, remoteKeySignature); !ok {
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return errKeySignatureMismatch
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}
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return nil
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case *ecdsa.PublicKey:
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ecdsaSig := &ecdsaSignature{}
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if _, err := asn1.Unmarshal(remoteKeySignature, ecdsaSig); err != nil {
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return err
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}
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if ecdsaSig.R.Sign() <= 0 || ecdsaSig.S.Sign() <= 0 {
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return errInvalidECDSASignature
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}
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hash := hashAlgorithm.Digest(handshakeBodies)
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if !ecdsa.Verify(p, hash, ecdsaSig.R, ecdsaSig.S) {
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return errKeySignatureMismatch
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}
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return nil
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case *rsa.PublicKey:
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switch certificate.SignatureAlgorithm {
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case x509.SHA1WithRSA, x509.SHA256WithRSA, x509.SHA384WithRSA, x509.SHA512WithRSA:
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hash := hashAlgorithm.Digest(handshakeBodies)
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return rsa.VerifyPKCS1v15(p, hashAlgorithm.CryptoHash(), hash, remoteKeySignature)
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default:
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return errKeySignatureVerifyUnimplemented
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}
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}
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return errKeySignatureVerifyUnimplemented
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}
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func loadCerts(rawCertificates [][]byte) ([]*x509.Certificate, error) {
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if len(rawCertificates) == 0 {
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return nil, errLengthMismatch
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}
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certs := make([]*x509.Certificate, 0, len(rawCertificates))
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for _, rawCert := range rawCertificates {
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cert, err := x509.ParseCertificate(rawCert)
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if err != nil {
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return nil, err
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}
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certs = append(certs, cert)
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}
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return certs, nil
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}
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func verifyClientCert(rawCertificates [][]byte, roots *x509.CertPool) (chains [][]*x509.Certificate, err error) {
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certificate, err := loadCerts(rawCertificates)
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if err != nil {
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return nil, err
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}
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intermediateCAPool := x509.NewCertPool()
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for _, cert := range certificate[1:] {
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intermediateCAPool.AddCert(cert)
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}
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opts := x509.VerifyOptions{
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Roots: roots,
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CurrentTime: time.Now(),
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Intermediates: intermediateCAPool,
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KeyUsages: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
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}
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return certificate[0].Verify(opts)
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}
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func verifyServerCert(rawCertificates [][]byte, roots *x509.CertPool, serverName string) (chains [][]*x509.Certificate, err error) {
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certificate, err := loadCerts(rawCertificates)
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if err != nil {
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return nil, err
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}
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intermediateCAPool := x509.NewCertPool()
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for _, cert := range certificate[1:] {
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intermediateCAPool.AddCert(cert)
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}
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opts := x509.VerifyOptions{
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Roots: roots,
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CurrentTime: time.Now(),
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DNSName: serverName,
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Intermediates: intermediateCAPool,
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}
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return certificate[0].Verify(opts)
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}
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