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#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <openssl/md5.h>
static int usage()
{
fprintf(stderr,"md5 file ...\n");
return -1;
}
static int do_md5(const char *path)
{
unsigned int i;
int fd;
MD5_CTX md5_ctx;
unsigned char md5[MD5_DIGEST_LENGTH];
fd = open(path, O_RDONLY);
if (fd < 0) {
fprintf(stderr,"could not open %s, %s\n", path, strerror(errno));
return -1;
}
MD5_Init(&md5_ctx);
while (1) {
char buf[4096];
ssize_t rlen;
rlen = read(fd, buf, sizeof(buf));
if (rlen == 0)
break;
else if (rlen < 0) {
(void)close(fd);
fprintf(stderr,"could not read %s, %s\n", path, strerror(errno));
return -1;
}
MD5_Update(&md5_ctx, buf, rlen);
}
if (close(fd)) {
fprintf(stderr,"could not close %s, %s\n", path, strerror(errno));
return -1;
}
MD5_Final(md5, &md5_ctx);
for (i = 0; i < (int)sizeof(md5); i++)
printf("%02x", md5[i]);
printf(" %s\n", path);
return 0;
}
int md5_main(int argc, char *argv[])
{
int i, ret = 0;
if (argc < 2)
return usage();
/* loop over the file args */
for (i = 1; i < argc; i++) {
if (do_md5(argv[i]))
ret = 1;
}
return ret;
}
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