sick

commit 7ecf401609eb89626e79c80bd037e529e5f33511
parent f25a0ec2408627875aea874ec4384e1cc0ad0d2e
Author: z3bra <willyatmailoodotorg>
Date:   Sun May 15 19:37:43 +12000

check() verifies the signature of the message

Diffstat:
sick.c
 | 
28
++++++++++++++++++++++++++++
1 file changed, 28 insertions(+), 0 deletions(-)
diff --git a/sick.c b/sick.c
@@ -23,6 +23,7 @@ static size_t extractmsg(unsigned char *msg[], char *buf);
 static size_t extractsig(unsigned char *sig[], char *buf);
 static int createkeypair(const char *);
 static int sign(FILE *fp, FILE *key);
+static int check(FILE *fp, FILE *key);
 
 static int verbose = 0;
 char *argv0;
@@ -203,6 +204,33 @@ sign(FILE *fp, FILE *key)
 	return 0;
 }
 
+static int
+check(FILE *fp, FILE *key)
+{
+	int ret = 0;
+	size_t len;
+	char *buf = NULL;
+	unsigned char *sig, *msg, pub[32];
+
+	if (fread(pub, 1, 32, key) < 32)
+		return -1;
+
+	len = bufferize(&buf, fp);
+	if (len == 0)
+		return -1;
+
+	if (extractsig(&sig, buf)) {
+		len = extractmsg(&msg, buf);
+		ret = ed25519_verify(sig, msg, len, pub);
+		free(msg);
+	}
+
+	free(buf);
+	free(sig);
+
+	return !ret;
+}
+
 int
 main(int argc, char *argv[])
 {