Added CAVEATS section

[openssl-gost/engine.git] / gost12sum.c

diff --git a/gost12sum.c b/gost12sum.c
index f59bc05e4c2f1e43f080e34f7f2b10f28a7662cb..887eb1c0984d422a9c48efa5ef6e84863ad544f0 100644 (file)
--- a/gost12sum.c
+++ b/gost12sum.c
@@ -34,17 +34,18 @@ int hash_file(gost_hash_ctx * ctx, char *filename, char *sum, int mode);
 int hash_stream(gost_hash_ctx * ctx, int fd, char *sum);
 int get_line(FILE *f, char *hash, char *filename, int verbose);
 
-void help()
+void help(const char *progname)
 {
     fprintf(stderr, "Calculates GOST R 34.11-2012 hash function\n\n");
-    fprintf(stderr, "gostsum12 [-bvl] [-c [file]]| [files]|-x\n"
+    fprintf(stderr, "%s [-bvl] [-c [file]]| [files]|-x\n"
             "\t-c check message digests (default is generate)\n"
             "\t-v verbose, print file names when checking\n"
             "\t-b read files in binary mode\n"
             "\t-l use 512 bit hash (default 256 bit)\n"
             "\t-x read filenames from stdin rather than from arguments \n"
             "The input for -c should be the list of message digests and file names\n"
-            "that is printed on stdout by this program when it generates digests.\n");
+                  "that is printed on stdout by this program when it generates"
+                  "digests.\n", progname);
     exit(3);
 }
 
@@ -107,7 +108,7 @@ int main(int argc, char **argv)
             break;
         default:
             fprintf(stderr, "invalid option %c", optopt);
-            help();
+            help(argv[0]);
         }
     }
     if (check_file) {
@@ -214,19 +215,19 @@ int hash_file(gost_hash_ctx * ctx, char *filename, char *sum, int mode)
 int hash_stream(gost_hash_ctx * ctx, int fd, char *sum)
 {
     unsigned char buffer[BUF_SIZE];
-    unsigned char reverted_buffer[BUF_SIZE];
     ssize_t bytes;
+               size_t i;
 
     start_hash12(ctx);
     while ((bytes = read(fd, buffer, BUF_SIZE)) > 0) {
-        hash12_block(ctx, reverted_buffer, bytes);
+        hash12_block(ctx, buffer, bytes);
     }
     if (bytes < 0) {
         return 0;
     }
     finish_hash12(ctx, buffer);
-    for (size_t i = 0; i < (hashsize / 8); i++) {
-        sprintf(sum + 2 * i, "%02x", buffer[i]);
+    for (i = 0; i < (hashsize / 8); i++) {
+        sprintf(sum + 2 * i, "%02x", buffer[hashsize/8-1-i]);
     }
     return 1;
 }