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Fix bug (wrong value computed) when reading file from stdin, implement

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This commit is contained in:
Glenn L McGrath 2003-06-07 17:06:28 +00:00
parent 7aa62cf173
commit 138d71bc35
1 changed files with 42 additions and 40 deletions
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70
coreutils/sha1sum.c
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@ -4,7 +4,7 @@
* shasum fixed with reference to coreutils and the nist fip180-1 document
* which is incorrect, in section 5
* - ft(B,C,D) = (B AND C) OR ((NOT B) AND D) ( 0 <= t <= 19)
* + ft(B,C,D) = (D XOR (B AND (C XOR S))) ( 0 <= t <= 19)
* + ft(B,C,D) = (D XOR (B AND (C XOR D))) ( 0 <= t <= 19)
*
* Copyright (C) 1999 Scott G. Miller
* Copyright (C) 2003 Glenn L. McGrath
@ -112,7 +112,7 @@ static void sha_hash(unsigned int *data, int *hash)
hash[4] += e;
}
static void sha1sum_stream(FILE * fd, unsigned int *hashval)
static void sha1sum_stream(FILE *fd, unsigned int *hashval)
{
RESERVE_CONFIG_BUFFER(buffer, 64);
int length = 0;
@ -128,11 +128,6 @@ static void sha1sum_stream(FILE * fd, unsigned int *hashval)
length += c;
if (feof(fd) || ferror(fd)) {
int i;
/* If reading from stdin we need to get rid of a tailing character */
if (fd == stdin) {
c--;
length--;
}
for (i = c; i < 61; i++) {
if (i == c) {
buffer[i] = 0x80;
@ -153,34 +148,37 @@ static void sha1sum_stream(FILE * fd, unsigned int *hashval)
return;
}
static void print_hash(unsigned short hash_length, unsigned int *hash_val, char *filename)
static void print_hash(unsigned int *hash_value, unsigned char hash_length, unsigned char *filename)
{
int x;
unsigned char x;
for (x = 0; x < hash_length; x++) {
printf("%08x", hash_val[x]);
printf("%08x", hash_value[x]);
}
if (filename != NULL) {
putchar(' ');
putchar(' ');
puts(filename);
}
putchar('\n');
}
#define FLAG_SILENT 1
#define FLAG_CHECK 2
#define FLAG_WARN 3
/* This should become a common function used by sha1sum and md5sum,
* it needs extra functionality first
*/
extern int authenticate(const int argc, char **argv, void (*hash_ptr)(FILE *stream, unsigned int *hashval), const unsigned short hash_length)
extern int authenticate(int argc, char **argv, void (*hash_ptr)(FILE *stream, unsigned int *hashval), const unsigned char hash_length)
{
unsigned int hash_value[hash_length];
unsigned char flags = 0;
int opt;
unsigned int *hashval;
while ((opt = getopt(argc, argv, "sc:w")) != -1) {
switch (opt) {
#if 0
case 's': /* Dont output anything, status code shows success */
flags |= FLAG_SILENT;
break;
#if 0
case 'c': /* Check a list of checksums against stored values */
break;
case 'w': /* Warn of bad formatting when checking files */
@ -191,34 +189,38 @@ extern int authenticate(const int argc, char **argv, void (*hash_ptr)(FILE *stre
}
}
hashval = xmalloc(hash_length * sizeof(unsigned int));
if (argc == optind) {
hash_ptr(stdin, hashval);
print_hash(hash_length, hashval, NULL);
argv[argc] = "-";
}
while (optind < argc) {
FILE *stream;
unsigned char *file_ptr = argv[optind];
if ((file_ptr[0] == '-') && (file_ptr[1] == '\0')) {
stream = stdin;
} else {
int i;
for (i = optind; i < argc; i++) {
if (!strcmp(argv[i], "-")) {
hash_ptr(stdin, hashval);
print_hash(hash_length, hashval, NULL);
} else {
FILE *stream = bb_xfopen(argv[i], "r");
hash_ptr(stream, hashval);
fclose(stream);
print_hash(hash_length, hashval, argv[i]);
stream = bb_wfopen(file_ptr, "r");
if (stream == NULL) {
return(EXIT_FAILURE);
}
}
hash_ptr(stream, hash_value);
if (!flags & FLAG_SILENT) {
print_hash(hash_value, hash_length, file_ptr);
}
free(hashval);
if (fclose(stream) == EOF) {
bb_perror_msg_and_die("Couldnt close file %s", file_ptr);
}
return 0;
optind++;
}
return(EXIT_SUCCESS);
}
extern int sha1sum_main(int argc, char **argv)
{
/* sha1 length is 5 nibbles */
return (authenticate(argc, argv, sha1sum_stream, 5));
}