aboutsummaryrefslogtreecommitdiff
path: root/coreutils/md5_sha1_sum.c
blob: 014ecefd0df24821d04d43284f18348871de0c00 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
/* vi: set sw=4 ts=4: */
/*
 *  Copyright (C) 2003 Glenn L. McGrath
 *  Copyright (C) 2003-2004 Erik Andersen
 *
 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
 */

#include "busybox.h"

typedef enum { HASH_SHA1, HASH_MD5 } hash_algo_t;

#define FLAG_SILENT	1
#define FLAG_CHECK	2
#define FLAG_WARN	4

/* This might be useful elsewhere */
static unsigned char *hash_bin_to_hex(unsigned char *hash_value,
				unsigned hash_length)
{
	/* xzalloc zero-terminates */
	char *hex_value = xzalloc((hash_length * 2) + 1);
	bin2hex(hex_value, (char*)hash_value, hash_length);
	return hex_value;
}

static uint8_t *hash_file(const char *filename, hash_algo_t hash_algo)
{
	int src_fd, hash_len, count;
	union _ctx_ {
		sha1_ctx_t sha1;
		md5_ctx_t md5;
	} context;
	uint8_t *hash_value = NULL;
	RESERVE_CONFIG_UBUFFER(in_buf, 4096);
	void (*update)(const void*, size_t, void*);
	void (*final)(void*, void*);

	src_fd = STDIN_FILENO;
	if (NOT_LONE_DASH(filename)) {
		src_fd = open(filename, O_RDONLY);
		if (src_fd < 0) {
			bb_perror_msg("%s", filename);
			return NULL;
		}
	}

	/* figure specific hash algorithims */
	if (ENABLE_MD5SUM && hash_algo==HASH_MD5) {
		md5_begin(&context.md5);
		update = (void (*)(const void*, size_t, void*))md5_hash;
		final = (void (*)(void*, void*))md5_end;
		hash_len = 16;
	} else if (ENABLE_SHA1SUM && hash_algo==HASH_SHA1) {
		sha1_begin(&context.sha1);
		update = (void (*)(const void*, size_t, void*))sha1_hash;
		final = (void (*)(void*, void*))sha1_end;
		hash_len = 20;
	} else {
		bb_error_msg_and_die("algorithm not supported");
	}

	while (0 < (count = safe_read(src_fd, in_buf, 4096))) {
		update(in_buf, count, &context);
	}

	if (count == 0) {
		final(in_buf, &context);
		hash_value = hash_bin_to_hex(in_buf, hash_len);
	}

	RELEASE_CONFIG_BUFFER(in_buf);

	if (src_fd != STDIN_FILENO) {
		close(src_fd);
	}

	return hash_value;
}

int md5_sha1_sum_main(int argc, char **argv)
{
	int return_value = EXIT_SUCCESS;
	uint8_t *hash_value;
	unsigned flags;
	hash_algo_t hash_algo = ENABLE_MD5SUM
		? (ENABLE_SHA1SUM ? (**argv=='m' ? HASH_MD5 : HASH_SHA1) : HASH_MD5)
		: HASH_SHA1;

	if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK)
		flags = getopt32(argc, argv, "scw");
	else optind = 1;

	if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && !(flags & FLAG_CHECK)) {
		if (flags & FLAG_SILENT) {
			bb_error_msg_and_die
				("-%c is meaningful only when verifying checksums", 's');
		} else if (flags & FLAG_WARN) {
			bb_error_msg_and_die
				("-%c is meaningful only when verifying checksums", 'w');
		}
	}

	if (argc == optind) {
		argv[argc++] = "-";
	}

	if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && (flags & FLAG_CHECK)) {
		FILE *pre_computed_stream;
		int count_total = 0;
		int count_failed = 0;
		char *file_ptr = argv[optind];
		char *line;

		if (optind + 1 != argc) {
			bb_error_msg_and_die
				("only one argument may be specified when using -c");
		}

		pre_computed_stream = stdin;
		if (NOT_LONE_DASH(file_ptr)) {
			pre_computed_stream = xfopen(file_ptr, "r");
		}

		while ((line = xmalloc_getline(pre_computed_stream)) != NULL) {
			char *filename_ptr;

			count_total++;
			filename_ptr = strstr(line, "  ");
			/* handle format for binary checksums */
			if (filename_ptr == NULL) {
				filename_ptr = strstr(line, " *");
			}
			if (filename_ptr == NULL) {
				if (flags & FLAG_WARN) {
					bb_error_msg("invalid format");
				}
				count_failed++;
				return_value = EXIT_FAILURE;
				free(line);
				continue;
			}
			*filename_ptr = '\0';
			filename_ptr += 2;

			hash_value = hash_file(filename_ptr, hash_algo);

			if (hash_value && (strcmp((char*)hash_value, line) == 0)) {
				if (!(flags & FLAG_SILENT))
					printf("%s: OK\n", filename_ptr);
			} else {
				if (!(flags & FLAG_SILENT))
					printf("%s: FAILED\n", filename_ptr);
				count_failed++;
				return_value = EXIT_FAILURE;
			}
			/* possible free(NULL) */
			free(hash_value);
			free(line);
		}
		if (count_failed && !(flags & FLAG_SILENT)) {
			bb_error_msg("WARNING: %d of %d computed checksums did NOT match",
						 count_failed, count_total);
		}
		/*
		if (fclose_if_not_stdin(pre_computed_stream) == EOF) {
			bb_perror_msg_and_die("cannot close file %s", file_ptr);
		}
		*/
	} else {
		while (optind < argc) {
			char *file_ptr = argv[optind++];

			hash_value = hash_file(file_ptr, hash_algo);
			if (hash_value == NULL) {
				return_value = EXIT_FAILURE;
			} else {
				printf("%s  %s\n", hash_value, file_ptr);
				free(hash_value);
			}
		}
	}
	return return_value;
}