Httpauth digest response (#944)

* httpauth: http digest challenge response using RFC 7616
  + definition of response struct using char* to save the parameters
  + added decoding for new fields in http digest challenge struct
  + response calculation supports qop: none, auth, auth-int
  + supported hash algorithm: MD5, SHA1, SHA265 and -sess variants

* httpauth: test cases for http digest response calculation and printing

* httpauth: fix mentioned review points

* httpauth: remove SHA1 support

* httpauth: save cnonce and nc as uint32_t in struct.

* httpauth: change loop counter to size_t

* httpauth: remove unused enum

* README: update RFC list, add RFC 7616 - HTTP Digest Access Authentication

README.md

@@ -218,6 +218,7 @@ legend:
 * [RFC 6455](https://tools.ietf.org/html/rfc6455) - The WebSocket Protocol
 * [RFC 7159](https://tools.ietf.org/html/rfc7159) - JavaScript Object Notation (JSON)
 * [RFC 7350](https://tools.ietf.org/html/rfc7350) - DTLS as Transport for STUN
+* [RFC 7616](https://tools.ietf.org/html/rfc7616) - HTTP Digest Access Authentication
 * [RFC 7714](https://tools.ietf.org/html/rfc7714) - AES-GCM Authenticated Encryption in SRTP
 
 

include/re_httpauth.h

@@ -35,6 +35,28 @@ struct httpauth_digest_chall {
 	struct pl userhash;
 };
 
+struct httpauth_digest_enc_resp {
+	char *realm;
+	char *nonce;
+	char *opaque;
+	char *algorithm;
+	char *qop;
+
+	/* response specific */
+	char *response;
+	char *username;
+	char *username_star;
+	char *uri;
+	uint32_t cnonce;
+	uint32_t nc;
+
+	/* optional */
+	char *charset;
+	bool userhash;
+	void (*hashh)(const uint8_t *, size_t, uint8_t *);
+	size_t hash_length;
+};
+
 /** HTTP Digest response */
 struct httpauth_digest_resp {
 	struct pl realm;
@@ -81,6 +103,21 @@ int httpauth_digest_response_encode(const struct httpauth_digest_resp *resp,
 				  struct mbuf *mb);
 
 
+int httpauth_digest_response_print(struct re_printf *pf,
+	const struct httpauth_digest_enc_resp *resp);
+int httpauth_digest_response_set_cnonce(struct httpauth_digest_enc_resp *resp,
+	const struct httpauth_digest_chall *chall, const struct pl *method,
+	const char *user,	const char *passwd, const char *entitybody,
+	const uint32_t cnonce, const uint32_t nc_);
+int httpauth_digest_response(struct httpauth_digest_enc_resp **presp,
+	const struct httpauth_digest_chall *chall, const struct pl *method,
+	const char *uri, const char *user, const char *passwd, const char *qop,
+	const char *entitybody);
+int httpauth_digest_response_full(struct httpauth_digest_enc_resp **presp,
+	const struct httpauth_digest_chall *chall, const struct pl *method,
+	const char *uri, const char *user, const char *passwd, const char *qop,
+	const char *entitybody, const char *charset, const bool userhash);
+
 int httpauth_digest_chall_req_print(struct re_printf *pf,
 	const struct httpauth_digest_chall_req *req);
 int httpauth_digest_chall_request(struct httpauth_digest_chall_req **preq,