1 files changed, 107 insertions, 0 deletions
diff --git a/vendor/github.com/rsc/letsencrypt/vendor/github.com/xenolf/lego/acme/jws.go b/vendor/github.com/rsc/letsencrypt/vendor/github.com/xenolf/lego/acme/jws.go
new file mode 100644
index 000000000..8435d0cfc
--- /dev/null
+++ b/vendor/github.com/rsc/letsencrypt/vendor/github.com/xenolf/lego/acme/jws.go
@@ -0,0 +1,107 @@
+package acme
+
+import (
+	"bytes"
+	"crypto"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rsa"
+	"fmt"
+	"net/http"
+
+	"gopkg.in/square/go-jose.v1"
+)
+
+type jws struct {
+	directoryURL string
+	privKey      crypto.PrivateKey
+	nonces       []string
+}
+
+func keyAsJWK(key interface{}) *jose.JsonWebKey {
+	switch k := key.(type) {
+	case *ecdsa.PublicKey:
+		return &jose.JsonWebKey{Key: k, Algorithm: "EC"}
+	case *rsa.PublicKey:
+		return &jose.JsonWebKey{Key: k, Algorithm: "RSA"}
+
+	default:
+		return nil
+	}
+}
+
+// Posts a JWS signed message to the specified URL
+func (j *jws) post(url string, content []byte) (*http.Response, error) {
+	signedContent, err := j.signContent(content)
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := httpPost(url, "application/jose+json", bytes.NewBuffer([]byte(signedContent.FullSerialize())))
+	if err != nil {
+		return nil, err
+	}
+
+	j.getNonceFromResponse(resp)
+
+	return resp, err
+}
+
+func (j *jws) signContent(content []byte) (*jose.JsonWebSignature, error) {
+
+	var alg jose.SignatureAlgorithm
+	switch k := j.privKey.(type) {
+	case *rsa.PrivateKey:
+		alg = jose.RS256
+	case *ecdsa.PrivateKey:
+		if k.Curve == elliptic.P256() {
+			alg = jose.ES256
+		} else if k.Curve == elliptic.P384() {
+			alg = jose.ES384
+		}
+	}
+
+	signer, err := jose.NewSigner(alg, j.privKey)
+	if err != nil {
+		return nil, err
+	}
+	signer.SetNonceSource(j)
+
+	signed, err := signer.Sign(content)
+	if err != nil {
+		return nil, err
+	}
+	return signed, nil
+}
+
+func (j *jws) getNonceFromResponse(resp *http.Response) error {
+	nonce := resp.Header.Get("Replay-Nonce")
+	if nonce == "" {
+		return fmt.Errorf("Server did not respond with a proper nonce header.")
+	}
+
+	j.nonces = append(j.nonces, nonce)
+	return nil
+}
+
+func (j *jws) getNonce() error {
+	resp, err := httpHead(j.directoryURL)
+	if err != nil {
+		return err
+	}
+
+	return j.getNonceFromResponse(resp)
+}
+
+func (j *jws) Nonce() (string, error) {
+	nonce := ""
+	if len(j.nonces) == 0 {
+		err := j.getNonce()
+		if err != nil {
+			return nonce, err
+		}
+	}
+
+	nonce, j.nonces = j.nonces[len(j.nonces)-1], j.nonces[:len(j.nonces)-1]
+	return nonce, nil
+}