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/types.h>
13 #include <sys/stat.h>
14 #include <fcntl.h>
15 #include <unistd.h>
16
17 #include <errno.h>
18 #include <stdio.h>
19 #include <stdlib.h>
20
21 #include "mdX.h"
22
23 char *
MDXEnd(MDX_CTX * ctx,char * buf)24 MDXEnd(MDX_CTX *ctx, char *buf)
25 {
26 int i;
27 unsigned char digest[LENGTH];
28 static const char hex[]="0123456789abcdef";
29
30 if (!buf)
31 buf = malloc(2*LENGTH + 1);
32 if (!buf)
33 return 0;
34 MDXFinal(digest, ctx);
35 for (i = 0; i < LENGTH; i++) {
36 buf[i+i] = hex[digest[i] >> 4];
37 buf[i+i+1] = hex[digest[i] & 0x0f];
38 }
39 buf[i+i] = '\0';
40 return buf;
41 }
42
43 char *
MDXFd(int fd,char * buf)44 MDXFd(int fd, char *buf)
45 {
46 return MDXFdChunk(fd, buf, 0, 0);
47 }
48
49 char *
MDXFdChunk(int fd,char * buf,off_t ofs,off_t len)50 MDXFdChunk(int fd, char *buf, off_t ofs, off_t len)
51 {
52 unsigned char buffer[16*1024];
53 MDX_CTX ctx;
54 struct stat stbuf;
55 int readrv, e;
56 off_t remain;
57
58 if (len < 0) {
59 errno = EINVAL;
60 return NULL;
61 }
62
63 MDXInit(&ctx);
64 if (ofs != 0) {
65 errno = 0;
66 if (lseek(fd, ofs, SEEK_SET) != ofs ||
67 (ofs == -1 && errno != 0)) {
68 readrv = -1;
69 goto error;
70 }
71 }
72 remain = len;
73 readrv = 0;
74 while (len == 0 || remain > 0) {
75 if (len == 0 || remain > sizeof(buffer))
76 readrv = read(fd, buffer, sizeof(buffer));
77 else
78 readrv = read(fd, buffer, remain);
79 if (readrv <= 0)
80 break;
81 MDXUpdate(&ctx, buffer, readrv);
82 remain -= readrv;
83 }
84 error:
85 if (readrv < 0)
86 return NULL;
87 return (MDXEnd(&ctx, buf));
88 }
89
90 char *
MDXFile(const char * filename,char * buf)91 MDXFile(const char *filename, char *buf)
92 {
93 return (MDXFileChunk(filename, buf, 0, 0));
94 }
95
96 char *
MDXFileChunk(const char * filename,char * buf,off_t ofs,off_t len)97 MDXFileChunk(const char *filename, char *buf, off_t ofs, off_t len)
98 {
99 char *ret;
100 int e, fd;
101
102 fd = open(filename, O_RDONLY);
103 if (fd < 0)
104 return NULL;
105 ret = MDXFdChunk(fd, buf, ofs, len);
106 e = errno;
107 close (fd);
108 errno = e;
109 return ret;
110 }
111
112 char *
MDXData(const void * data,unsigned int len,char * buf)113 MDXData (const void *data, unsigned int len, char *buf)
114 {
115 MDX_CTX ctx;
116
117 MDXInit(&ctx);
118 MDXUpdate(&ctx,data,len);
119 return (MDXEnd(&ctx, buf));
120 }
121
122 #ifdef WEAK_REFS
123 /* When building libmd, provide weak references. Note: this is not
124 activated in the context of compiling these sources for internal
125 use in libcrypt.
126 */
127 #undef MDXEnd
128 __weak_reference(_libmd_MDXEnd, MDXEnd);
129 #undef MDXFile
130 __weak_reference(_libmd_MDXFile, MDXFile);
131 #undef MDXFileChunk
132 __weak_reference(_libmd_MDXFileChunk, MDXFileChunk);
133 #undef MDXFd
134 __weak_reference(_libmd_MDXFd, MDXFd);
135 #undef MDXFdChunk
136 __weak_reference(_libmd_MDXFdChunk, MDXFdChunk);
137 #undef MDXData
138 __weak_reference(_libmd_MDXData, MDXData);
139 #endif
140