From e346b4eb971b273cbb088200d1eee41448a1bb08 Mon Sep 17 00:00:00 2001
From: Louis Burda <quent.burda@gmail.com>
Date: Mon, 31 May 2021 20:24:08 +0200
Subject: fix checker do_auth, add hashing to revhash for comparing

---
 checker/src/checker.py     |  2 +-
 checker/src/revhash/main.c | 50 ++++++++++++++++++++++++++++++++++++++--------
 2 files changed, 43 insertions(+), 9 deletions(-)

(limited to 'checker/src')

diff --git a/checker/src/checker.py b/checker/src/checker.py
index 9fd02a9..2cf53a7 100644
--- a/checker/src/checker.py
+++ b/checker/src/checker.py
@@ -69,7 +69,7 @@ class STLDoctorChecker(BaseChecker):
 
     def do_auth(self, conn, authstr):
         conn.write("auth\n")
-        conn.write(authstr + b"\n")
+        conn.write(authstr + "\n")
         resp = conn.recvuntil(self.prompt)
         authstr = ensure_bytes(authstr)
         assert_in(b"Success!", resp, f"Login with pass {authstr} failed");
diff --git a/checker/src/revhash/main.c b/checker/src/revhash/main.c
index f872e33..0c35ce4 100644
--- a/checker/src/revhash/main.c
+++ b/checker/src/revhash/main.c
@@ -4,22 +4,42 @@
 #include <stdint.h>
 
 #define MAXITER   256 * 100
+#define MHASHLEN  40
 #define MAX(x,y)  ((x) > (y) ? (x) : (y))
 #define MIN(x,y)  ((x) < (y) ? (x) : (y))
 
 int
-main(int argc, const char **argv)
+hash()
 {
-	const char *hashstr;
-	char c, hexbuf[3] = { 0 }, *end, *buf;
-	int i, k, v, maxlen, sum, *hash, sublen, aftersum;
+	static char buf[MHASHLEN + 1];
+	char str[256];
+	int i, k, v;
+	char c, *bp;
+	size_t len;
 
-	if (argc < 2) {
-		fprintf(stderr, "USAGE: revhash <hash>\n");
+	if (!fgets(str, sizeof(str), stdin))
 		return EXIT_FAILURE;
-	}
 
-	hashstr = argv[1];
+	len = strlen(str) -1;
+	if (len <= 0) return EXIT_FAILURE;
+
+	for (v = 0, i = 0; i < len; i++) v += str[i];
+
+	srand(v);
+	for (bp = buf, i = 0; i < MHASHLEN / 2; i++)
+		bp += sprintf(bp, "%02x", str[i % len] ^ (rand() % 256));
+
+	printf("%s\n", buf);
+
+	return EXIT_SUCCESS;
+}
+
+int
+revhash(const char *hashstr)
+{
+	char c, hexbuf[3] = { 0 }, *end, *buf;
+	int i, k, v, maxlen, sum, *hash, sublen, aftersum;
+
 	if (strlen(hashstr) % 2 != 0)
 		goto invalid;
 
@@ -78,3 +98,17 @@ invalid:
 	fprintf(stderr, "Invalid hash string!\n");
 	return EXIT_FAILURE;
 }
+
+int
+main(int argc, const char **argv)
+{
+	if (argc < 2) {
+		fprintf(stderr, "USAGE: revhash <hash>\n");
+		return EXIT_FAILURE;
+	}
+
+	if (!strcmp(argv[1], "hash"))
+		return hash();
+	else
+		return revhash(argv[1]);
+}
-- 
cgit v1.2.3-71-gd317