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Diffstat (limited to 'src/sw/hash.c')
| -rw-r--r-- | src/sw/hash.c | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/src/sw/hash.c b/src/sw/hash.c new file mode 100644 index 0000000..2314fe4 --- /dev/null +++ b/src/sw/hash.c @@ -0,0 +1,310 @@ +/* + * 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> + +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 32-bit words */ +#define SHA1_BLOCK_LEN 16 +#define SHA1_DIGEST_LEN 5 +#define SHA256_BLOCK_LEN 16 +#define SHA256_DIGEST_LEN 8 +#define SHA512_BLOCK_LEN 32 +#define SHA512_224_DIGEST_LEN 7 +#define SHA512_256_DIGEST_LEN 8 +#define SHA384_DIGEST_LEN 12 +#define SHA512_DIGEST_LEN 16 + +/* ---------------- algorithm lookup code ---------------- */ + +struct ctrl { + char *name; + int i2c_addr; + int block_len; + int 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", 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 ---------------- */ + +/* return number of digest bytes read */ +int hash(char *dev, char *algo, char *file, uint8_t *digest) +{ + uint8_t block[SHA512_BLOCK_LEN * 4]; + 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; + + if (debug) printf("hash(dev=%s, algo=%s, file=%s, digest=%p)\n", dev, algo, file, digest); + + ctrl = find_algo(algo); + if (ctrl == NULL) + return -1; + addr = ctrl->i2c_addr; + blen = ctrl->block_len * 4; + dlen = ctrl->digest_len * 4; + + if (debug) printf("algorithm %s, device addr %02x\n", ctrl->name, ctrl->i2c_addr); + + 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 != blen) { + if (nread < 0) { + /* read error */ + perror("read"); + goto out; + } + else if (nread == 0) { + /* EOF */ + break; + } + else { + /* partial read - pad the block with 0 */ + while (nread < blen) { + block[nread++] = 0; + } + } + } + if (debug) { + printf("write ["); + for (i = 0; i < blen; ++i) + printf(" %02x", block[i]); + printf(" ]\n"); + } + if (write(i2c_fd, block, blen) != blen) { + perror("i2c write failed"); + 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; +} |