1 /*- mdXhl.c
2 * SPDX-License-Identifier: Beerware
3 *
4 * ----------------------------------------------------------------------------
5 * "THE BEER-WARE LICENSE" (Revision 42):
6 * <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
7 * can do whatever you want with this stuff. If we meet some day, and you think
8 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
9 * ----------------------------------------------------------------------------
10 */
11
12 #include <sys/cdefs.h>
13 #include <sys/types.h>
14 #include <sys/stat.h>
15 #include <fcntl.h>
16 #include <unistd.h>
17
18 #include <errno.h>
19 #include <stdio.h>
20 #include <stdlib.h>
21
22 #include "mdX.h"
23
24 char *
MDXEnd(MDX_CTX * ctx,char * buf)25 MDXEnd(MDX_CTX *ctx, char *buf)
26 {
27 int i;
28 unsigned char digest[LENGTH];
29 static const char hex[]="0123456789abcdef";
30
31 if (!buf)
32 buf = malloc(2*LENGTH + 1);
33 if (!buf)
34 return 0;
35 MDXFinal(digest, ctx);
36 for (i = 0; i < LENGTH; i++) {
37 buf[i+i] = hex[digest[i] >> 4];
38 buf[i+i+1] = hex[digest[i] & 0x0f];
39 }
40 buf[i+i] = '\0';
41 return buf;
42 }
43
44 char *
MDXFd(int fd,char * buf)45 MDXFd(int fd, char *buf)
46 {
47 return MDXFdChunk(fd, buf, 0, 0);
48 }
49
50 char *
MDXFdChunk(int fd,char * buf,off_t ofs,off_t len)51 MDXFdChunk(int fd, char *buf, off_t ofs, off_t len)
52 {
53 unsigned char buffer[16*1024];
54 MDX_CTX ctx;
55 struct stat stbuf;
56 int readrv, e;
57 off_t remain;
58
59 if (len < 0) {
60 errno = EINVAL;
61 return NULL;
62 }
63
64 MDXInit(&ctx);
65 if (ofs != 0) {
66 errno = 0;
67 if (lseek(fd, ofs, SEEK_SET) != ofs ||
68 (ofs == -1 && errno != 0)) {
69 readrv = -1;
70 goto error;
71 }
72 }
73 remain = len;
74 readrv = 0;
75 while (len == 0 || remain > 0) {
76 if (len == 0 || remain > sizeof(buffer))
77 readrv = read(fd, buffer, sizeof(buffer));
78 else
79 readrv = read(fd, buffer, remain);
80 if (readrv <= 0)
81 break;
82 MDXUpdate(&ctx, buffer, readrv);
83 remain -= readrv;
84 }
85 error:
86 if (readrv < 0)
87 return NULL;
88 return (MDXEnd(&ctx, buf));
89 }
90
91 char *
MDXFile(const char * filename,char * buf)92 MDXFile(const char *filename, char *buf)
93 {
94 return (MDXFileChunk(filename, buf, 0, 0));
95 }
96
97 char *
MDXFileChunk(const char * filename,char * buf,off_t ofs,off_t len)98 MDXFileChunk(const char *filename, char *buf, off_t ofs, off_t len)
99 {
100 char *ret;
101 int e, fd;
102
103 fd = open(filename, O_RDONLY);
104 if (fd < 0)
105 return NULL;
106 ret = MDXFdChunk(fd, buf, ofs, len);
107 e = errno;
108 close (fd);
109 errno = e;
110 return ret;
111 }
112
113 char *
MDXData(const void * data,unsigned int len,char * buf)114 MDXData (const void *data, unsigned int len, char *buf)
115 {
116 MDX_CTX ctx;
117
118 MDXInit(&ctx);
119 MDXUpdate(&ctx,data,len);
120 return (MDXEnd(&ctx, buf));
121 }
122
123 #ifdef WEAK_REFS
124 /* When building libmd, provide weak references. Note: this is not
125 activated in the context of compiling these sources for internal
126 use in libcrypt.
127 */
128 #undef MDXEnd
129 __weak_reference(_libmd_MDXEnd, MDXEnd);
130 #undef MDXFile
131 __weak_reference(_libmd_MDXFile, MDXFile);
132 #undef MDXFileChunk
133 __weak_reference(_libmd_MDXFileChunk, MDXFileChunk);
134 #undef MDXData
135 __weak_reference(_libmd_MDXData, MDXData);
136 #endif
137