1 #include <errno.h> 2 #include <fcntl.h> 3 #include <stdio.h> 4 #include <unistd.h> 5 #include <sys/stat.h> 6 #include <sys/types.h> 7 #include <openssl/md5.h> 8 9 static int usage() 10 { 11 fprintf(stderr,"md5 file ...\n"); 12 return -1; 13 } 14 15 static int do_md5(const char *path) 16 { 17 unsigned int i; 18 int fd; 19 MD5_CTX md5_ctx; 20 unsigned char md5[MD5_DIGEST_LENGTH]; 21 22 fd = open(path, O_RDONLY); 23 if (fd < 0) { 24 fprintf(stderr,"could not open %s, %s\n", path, strerror(errno)); 25 return -1; 26 } 27 28 MD5_Init(&md5_ctx); 29 30 while (1) { 31 char buf[4096]; 32 ssize_t rlen; 33 rlen = read(fd, buf, sizeof(buf)); 34 if (rlen == 0) 35 break; 36 else if (rlen < 0) { 37 (void)close(fd); 38 fprintf(stderr,"could not read %s, %s\n", path, strerror(errno)); 39 return -1; 40 } 41 MD5_Update(&md5_ctx, buf, rlen); 42 } 43 if (close(fd)) { 44 fprintf(stderr,"could not close %s, %s\n", path, strerror(errno)); 45 return -1; 46 } 47 48 MD5_Final(md5, &md5_ctx); 49 50 for (i = 0; i < (int)sizeof(md5); i++) 51 printf("%02x", md5[i]); 52 printf(" %s\n", path); 53 54 return 0; 55 } 56 57 int md5_main(int argc, char *argv[]) 58 { 59 int i, ret = 0; 60 61 if (argc < 2) 62 return usage(); 63 64 /* loop over the file args */ 65 for (i = 1; i < argc; i++) { 66 if (do_md5(argv[i])) 67 ret = 1; 68 } 69 70 return ret; 71 } 72
