Fix digest credentials for proxy in windows

src/transports/winhttp.c

@@ -70,6 +70,7 @@ typedef enum {
 	GIT_WINHTTP_AUTH_BASIC = 1,
 	GIT_WINHTTP_AUTH_NTLM = 2,
 	GIT_WINHTTP_AUTH_NEGOTIATE = 4,
+	GIT_WINHTTP_AUTH_DIGEST = 8,
 } winhttp_authmechanism_t;
 
 typedef struct {
@@ -131,8 +132,13 @@ done:
 	return error;
 }
 
-static int apply_userpass_credential_proxy(HINTERNET request, git_cred *cred)
+static int apply_userpass_credential_proxy(HINTERNET request, git_cred *cred, int mechanisms)
 {
+	if (GIT_WINHTTP_AUTH_DIGEST & mechanisms) {
+		return _apply_userpass_credential(request, WINHTTP_AUTH_TARGET_PROXY,
+			WINHTTP_AUTH_SCHEME_DIGEST, cred);
+	}
+
 	return _apply_userpass_credential(request, WINHTTP_AUTH_TARGET_PROXY,
 		WINHTTP_AUTH_SCHEME_BASIC, cred);
 }
@@ -451,7 +457,7 @@ static int winhttp_stream_connect(winhttp_stream *s)
 
 		if (t->proxy_cred) {
 			if (t->proxy_cred->credtype == GIT_CREDTYPE_USERPASS_PLAINTEXT) {
-				if ((error = apply_userpass_credential_proxy(s->request, t->proxy_cred)) < 0)
+				if ((error = apply_userpass_credential_proxy(s->request, t->proxy_cred, t->auth_mechanisms)) < 0)
 					goto on_error;
 			}
 		}
@@ -612,6 +618,11 @@ static int parse_unauthorized_response(
 		*allowed_mechanisms |= GIT_WINHTTP_AUTH_BASIC;
 	}
 
+	if (WINHTTP_AUTH_SCHEME_DIGEST & supported) {
+		*allowed_types |= GIT_CREDTYPE_USERPASS_PLAINTEXT;
+		*allowed_mechanisms |= GIT_WINHTTP_AUTH_DIGEST;
+	}
+
 	return 0;
 }