aboutsummaryrefslogtreecommitdiff
path: root/src/sw/hash.c
blob: f9bb3b88a1c6957aab1563b38b38139be2c7e40a (plain) (blame)
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
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
/* 
 * hash.c
 * ------
 * This program uses the coretest_hashes subsystem to produce a
 * cryptographic hash of a file or input stream. It is a generalization
 * of the hash_tester.c test program.
 * 
 * Author: Paul Selkirk
 * Copyright (c) 2014, SUNET
 * 
 * Redistribution and use in source and binary forms, with or 
 * without modification, are permitted provided that the following 
 * conditions are met: 
 * 
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 * 
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in 
 *    the documentation and/or other materials provided with the 
 *    distribution. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <unistd.h>
#include <time.h>
#include <sys/time.h>
#include <linux/i2c-dev.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <assert.h>

char *usage = 
"Usage: %s [-d] [-v] [-q] [-i I2C_device] [-a I2C_addr] [algorithm [file]]\n"
"algorithms: sha-1, sha-256, sha-512/224, sha-512/256, sha-384, sha-512\n";

/* I2C configuration */
#define I2C_dev  "/dev/i2c-2"

int debug = 0;
int verbose = 0;

/* block and digest lengths are number of bytes */
#define SHA1_BLOCK_LEN          512/8
#define SHA1_DIGEST_LEN         160/8
#define SHA256_BLOCK_LEN        512/8
#define SHA256_DIGEST_LEN       256/8
#define SHA512_BLOCK_LEN        1024/8
#define SHA512_224_DIGEST_LEN   224/8
#define SHA512_256_DIGEST_LEN   256/8
#define SHA384_DIGEST_LEN       384/8
#define SHA512_DIGEST_LEN       512/8

/* ---------------- algorithm lookup code ---------------- */

struct ctrl {
    char *name;
    uint8_t i2c_addr;
    uint8_t block_len;
    uint8_t digest_len;
} ctrl[] = {
    { "sha-1",       0x1e, SHA1_BLOCK_LEN,   SHA1_DIGEST_LEN },
    { "sha-256",     0x1f, SHA256_BLOCK_LEN, SHA256_DIGEST_LEN },
    { "sha-512/224", 0x20, SHA512_BLOCK_LEN, SHA512_224_DIGEST_LEN },
    { "sha-512/256", 0x21, SHA512_BLOCK_LEN, SHA512_256_DIGEST_LEN },
    { "sha-384",     0x22, SHA512_BLOCK_LEN, SHA384_DIGEST_LEN },
    { "sha-512",     0x23, SHA512_BLOCK_LEN, SHA512_DIGEST_LEN },
    { NULL, 0, 0, 0 }
};

/* return the control structure for the given algorithm */
struct ctrl *find_algo(char *algo)
{
    int i;

    for (i = 0; ctrl[i].name != NULL; ++i)
        if (strcmp(ctrl[i].name, algo) == 0)
            return &ctrl[i];

    fprintf(stderr, "algorithm \"%s\" not found\n\n", algo);
    fprintf(stderr, usage, "hash");
    return NULL;
}

/* ---------------- I2C low-level code ---------------- */

/* return file descriptor for i2c device */
int i2c_open(char *dev, int addr)
{
    int fd;

    fd = open(dev, O_RDWR);
    if (fd < 0) {
        fprintf(stderr, "Unable to open %s: ", dev);
        perror("");
        return -1;
    }

    if (ioctl(fd, I2C_SLAVE, addr) < 0) {
        fprintf(stderr, "Unable to set I2C slave device 0x%02x: ", addr);
        perror("");
        close(fd);
        return -1;
    }

    return fd;
}

void i2c_close(int ifd)
{
    close(ifd);
}

/* ---------------- hash ---------------- */

int transmit(uint8_t *block, uint8_t blen, int fd)
{
    int i;

    if (debug) {
        printf("write [");
        for (i = 0; i < blen; ++i)
            printf(" %02x", block[i]);
        printf(" ]\n");
    }

    if (write(fd, block, blen) != blen) {
        return 1;
    }

    return 0;
}

int pad_transmit(uint8_t *block, uint8_t flen, uint8_t blen, int fd, long long tlen)
{
    assert(flen < blen);

    block[flen++] = 0x80;
    memset(block + flen, 0, blen - flen);

    if (blen - flen < ((blen == 64) ? 8 : 16)) {
        if (transmit(block, blen, fd) != 0)
            return 1;
        memset(block, 0, blen);
    }

    /* properly the length is 128 bits for sha-512, but we can't
     * actually count above 64 bits
     */
    ((uint32_t *)block)[blen/4 - 2] = htonl((tlen >> 32) & 0xffff);
    ((uint32_t *)block)[blen/4 - 1] = htonl(tlen & 0xffff);

    return transmit(block, blen, fd);
}

/* return number of digest bytes read */
int hash(char *dev, char *algo, char *file, uint8_t *digest)
{
    uint8_t block[SHA512_BLOCK_LEN];
    struct ctrl *ctrl;
    int i2c_fd, in_fd = 0;
    int addr, blen, dlen;
    int nblk, nread;
    int i, ret = -1;
    struct timeval start, stop, difftime;

    ctrl = find_algo(algo);
    if (ctrl == NULL)
        return -1;
    addr = ctrl->i2c_addr;
    blen = ctrl->block_len;
    dlen = ctrl->digest_len;

    i2c_fd = i2c_open(dev, addr);
    if (i2c_fd < 0)
        return -1;

    if (strcmp(file, "-") != 0) {
        in_fd = open(file, O_RDONLY);
        if (in_fd < 0) {
            perror("open");
            goto out2;
        }
    }

    if (verbose) {
        if (gettimeofday(&start, NULL) < 0) {
            perror("gettimeofday");
            goto out;
        }
    }

    for (nblk = 0; ; ++nblk) {
        nread = read(in_fd, block, blen);
        if (nread < 0) {
            /* read error */
            perror("read");
            goto out;
        }
        else if (nread < blen) {
            /* partial read = last block */
            if (pad_transmit(block, nread, blen, i2c_fd,
                             (nblk * blen + nread) * 8) != 0)
                goto out;
            break;
        }
        else {
            /* full block read */
            if (transmit(block, blen, i2c_fd) != 0)
                goto out;
        }
    }

    for (i = 0; i < dlen; ++i) {
        /* read() on the i2c device only returns one byte at a time */
        if (read(i2c_fd, &digest[i], 1) != 1) {
            perror("i2c read failed");
            goto out;
        }
    }

    if (verbose) {
        if (gettimeofday(&stop, NULL) < 0) {
            perror("gettimeofday");
            goto out;
        }
        timersub(&stop, &start, &difftime);
        printf("%d blocks written in %d.%03d sec (%.3f blocks/sec)\n",
               nblk, (int)difftime.tv_sec, (int)difftime.tv_usec/1000,
               (float)nblk / ((float)difftime.tv_sec + ((float)difftime.tv_usec)/1000000));
    }

    ret = dlen;
out:
    if (in_fd != 0)
        close(in_fd);
out2:
    i2c_close(i2c_fd);
    return ret;
}

/* ---------------- main ---------------- */

int main(int argc, char *argv[])
{
    char *dev = I2C_dev;
    int addr = 0;
    int i, opt, quiet = 0;
    char *algo = "sha-1";
    char *file = "-";
    uint8_t digest[512/8];
    int dlen;

    while ((opt = getopt(argc, argv, "h?dvqi:a:")) != -1) {
        switch (opt) {
        case 'h':
        case '?':
            printf(usage, argv[0]);
            return 0;
        case 'd':
            debug = 1;
            break;
        case 'v':
            verbose = 1;
            break;
        case 'q':
            quiet = 1;
            break;
        case 'i':
            dev = optarg;
            break;
        case 'a':
            addr = (int)strtol(optarg, NULL, 0);
            if ((addr < 0x03) || (addr > 0x77)) {
                fprintf(stderr, "addr must be between 0x03 and 0x77\n");
                return 1;
            }
            break;
        default:
            fprintf(stderr, usage, argv[0]);
            return 1;
        }
    }

    if (optind < argc) {
        algo = argv[optind];
        ++optind;
    }
    else {
        if (!quiet)
            printf("defaulting to algorithm \"%s\"\n", algo);
    }

    if (optind < argc) {
        file = argv[optind];
        ++optind;
    }
    else {
        if (!quiet)
            printf("reading from stdin\n");
    }

    dlen = hash(dev, algo, file, digest);
    if (dlen < 0)
        return 1;

    for (i = 0; i < dlen; ++i) {
        printf("%02x", digest[i]);
        if (i % 16 == 15)
            printf("\n");
        else if (i % 4 == 3)
            printf(" ");
    }
    if (dlen % 16 != 0)
        printf("\n");

    return 0;
}