[hackers] [sbase] checksum tools: implement -c || Hiltjo Posthuma

From: <git_AT_suckless.org>
Date: Sun, 23 Mar 2014 19:02:44 +0100

commit 04f32f4d9aae63f80f5aa9b771190f47593bf62e
Author: Hiltjo Posthuma <hiltjo_AT_codemadness.org>
Date: Sun Mar 23 12:18:38 2014 +0100

    checksum tools: implement -c
    
    Signed-off-by: Hiltjo Posthuma <hiltjo_AT_codemadness.org>

diff --git a/crypt.h b/crypt.h
index 7242cdf..1855d37 100644
--- a/crypt.h
+++ b/crypt.h
_AT_@ -6,6 +6,7 @@ struct crypt_ops {
         void *s;
 };
 
+int cryptcheck(char *, int, char **, struct crypt_ops *, uint8_t *, size_t);
 int cryptmain(int, char **, struct crypt_ops *, uint8_t *, size_t);
 int cryptsum(struct crypt_ops *, FILE *, const char *, uint8_t *);
 void mdprint(const uint8_t *, const char *, size_t);
diff --git a/md5sum.c b/md5sum.c
index b51ca4e..19babd6 100644
--- a/md5sum.c
+++ b/md5sum.c
_AT_@ -24,13 +24,17 @@ int
 main(int argc, char *argv[])
 {
         uint8_t md[MD5_DIGEST_LENGTH];
+ char *checkfile = NULL;
 
         ARGBEGIN {
         case 'c':
- eprintf("not implemented
");
+ checkfile = EARGF(usage());
+ break;
         default:
                 usage();
         } ARGEND;
 
+ if(checkfile)
+ return cryptcheck(checkfile, argc, argv, &md5_ops, md, sizeof(md));
         return cryptmain(argc, argv, &md5_ops, md, sizeof(md));
 }
diff --git a/sha1sum.c b/sha1sum.c
index 14bda3f..48fe7c5 100644
--- a/sha1sum.c
+++ b/sha1sum.c
_AT_@ -24,13 +24,16 @@ int
 main(int argc, char *argv[])
 {
         uint8_t md[SHA1_DIGEST_LENGTH];
+ char *checkfile = NULL;
 
         ARGBEGIN {
         case 'c':
- eprintf("not implemented
");
+ checkfile = EARGF(usage());
         default:
                 usage();
         } ARGEND;
 
+ if(checkfile)
+ return cryptcheck(checkfile, argc, argv, &sha1_ops, md, sizeof(md));
         return cryptmain(argc, argv, &sha1_ops, md, sizeof(md));
 }
diff --git a/sha256sum.c b/sha256sum.c
index 957182e..8f9ed1f 100644
--- a/sha256sum.c
+++ b/sha256sum.c
_AT_@ -24,13 +24,16 @@ int
 main(int argc, char *argv[])
 {
         uint8_t md[SHA256_DIGEST_LENGTH];
+ char *checkfile = NULL;
 
         ARGBEGIN {
         case 'c':
- eprintf("not implemented
");
+ checkfile = EARGF(usage());
         default:
                 usage();
         } ARGEND;
 
+ if(checkfile)
+ return cryptcheck(checkfile, argc, argv, &sha256_ops, md, sizeof(md));
         return cryptmain(argc, argv, &sha256_ops, md, sizeof(md));
 }
diff --git a/sha512sum.c b/sha512sum.c
index 79bec11..97ffaca 100644
--- a/sha512sum.c
+++ b/sha512sum.c
_AT_@ -24,13 +24,16 @@ int
 main(int argc, char *argv[])
 {
         uint8_t md[SHA512_DIGEST_LENGTH];
+ char *checkfile = NULL;
 
         ARGBEGIN {
         case 'c':
- eprintf("not implemented
");
+ checkfile = EARGF(usage());
         default:
                 usage();
         } ARGEND;
 
+ if(checkfile)
+ return cryptcheck(checkfile, argc, argv, &sha512_ops, md, sizeof(md));
         return cryptmain(argc, argv, &sha512_ops, md, sizeof(md));
 }
diff --git a/util/crypt.c b/util/crypt.c
index 1c797a4..7048659 100644
--- a/util/crypt.c
+++ b/util/crypt.c
_AT_@ -2,9 +2,96 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
+#include <string.h>
 #include "../util.h"
+#include "../text.h"
 #include "../crypt.h"
 
+static int
+hexdec(int c) {
+ if(c >= '0' && c <= '9')
+ return c - '0';
+ else if(c >= 'A' && c <= 'F')
+ return c - 'A' + 10;
+ else if(c >= 'a' && c <= 'f')
+ return c - 'a' + 10;
+ return -1; /* unknown character */
+}
+
+static int
+mdcheckline(const char *s, uint8_t *md, size_t sz) {
+ size_t i;
+ int b1, b2;
+
+ for(i = 0; i < sz; i++) {
+ if(!*s || (b1 = hexdec(*s++)) < 0)
+ return -1; /* invalid format */
+ if(!*s || (b2 = hexdec(*s++)) < 0)
+ return -1; /* invalid format */
+ if((uint8_t)((b1 << 4) | b2) != md[i])
+ return 0; /* value mismatch */
+ }
+ return (i == sz) ? 1 : 0;
+}
+
+int
+cryptcheck(char *sumfile, int argc, char *argv[],
+ struct crypt_ops *ops, uint8_t *md, size_t sz)
+{
+ FILE *cfp, *fp;
+ char *buf = NULL, *line, *file, *p;
+ int r, nonmatch = 0, formatsucks = 0, noread = 0, ret = EXIT_SUCCESS;
+ size_t bufsiz = 0;
+
+ if(!(cfp = fopen(sumfile, "r")))
+ eprintf("fopen %s:", sumfile);
+
+ while((line = afgets(&buf, &bufsiz, cfp))) {
+ if(!(file = strstr(line, " "))) {
+ formatsucks++;
+ continue;
+ }
+ if((file - line) / 2 != sz) {
+ formatsucks++; /* checksum length mismatch */
+ continue;
+ }
+ *file = '
Received on Sun Mar 23 2014 - 19:02:44 CET