Hi all! This is just my first post in this mailing list!
I've just discover cryptodev-linux because I'm trying to use the crypto
hardware that I've
in a DM8148 demoboard from TI. I would like to implement a 'md5sum' replace
using
the hardware. At the moment I can verify the hardware it's working because the
OpenSSL
is using it for the digest.
I can do
openssl dgst -md5 <file>
I would like to extract this functionality in a little tool like md5sum in
order to compute
the md5 hash for a file. In the examples directory I can find the sha.c example
but it's
working in a limited buffer. I've implement the next but I only get the md5
digest from
the last block. Is it any way to do the hash from several blocks and
'accumulate' the
md5 digest to get the final correct one?
Thanks!
---
Based on sha.c
/*
* Demo on how to use /dev/crypto device for ciphering.
*
* Placed under public domain.
*
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <crypto/cryptodev.h>
#include "md5.h"
#define MD5_DIGEST_BLOCKSIZE 64
int md5_ctx_init(struct cryptodev_ctx* ctx, int cfd, const uint8_t *key,
unsigned int key_size)
{
memset(ctx, 0, sizeof(*ctx));
ctx->cfd = cfd;
if (key == NULL)
ctx->sess.mac = CRYPTO_MD5;
else {
ctx->sess.mac = CRYPTO_MD5_HMAC;
ctx->sess.mackeylen = key_size;
ctx->sess.mackey = (void*)key;
}
if (ioctl(ctx->cfd, CIOCGSESSION, &ctx->sess)) {
perror("ioctl(CIOCGSESSION)");
return -1;
}
return 0;
}
void md5_ctx_deinit(struct cryptodev_ctx* ctx)
{
if (ioctl(ctx->cfd, CIOCFSESSION, &ctx->sess.ses)) {
perror("ioctl(CIOCFSESSION)");
}
}
int md5_hash(struct cryptodev_ctx* ctx, const void* text, size_t size, void*
digest)
{
struct crypt_op cryp;
void* p;
/* check text and ciphertext alignment */
if (ctx->alignmask) {
p = (void*)(((unsigned long)text + ctx->alignmask) &
~ctx->alignmask);
if (text != p) {
fprintf(stderr, "text is not aligned\n");
return -1;
}
}
memset(&cryp, 0, sizeof(cryp));
/* Encrypt data.in to data.encrypted */
cryp.ses = ctx->sess.ses;
cryp.len = size;
cryp.src = (void*)text;
cryp.mac = digest;
if (ioctl(ctx->cfd, CIOCCRYPT, &cryp)) {
perror("ioctl(CIOCCRYPT)");
return -1;
}
return 0;
}
int main( int argc, char **argv )
{
int cfd = -1;
int i, fd;
struct cryptodev_ctx ctx;
uint8_t digest[16];
uint8_t block[MD5_DIGEST_BLOCKSIZE];
size_t nread;
/* Check args */
if (argc < 2) {
printf("Usage: %s <filename>\n", argv[0]);
return 1;
}
/* Open file to hash */
fd = open(argv[1], O_RDONLY, 0);
if (fd < 0) {
printf("open(%s)", argv[1]);
return 1;
}
/* Open the crypto device */
cfd = open("/dev/crypto", O_RDWR, 0);
if (cfd < 0) {
perror("open(/dev/crypto)");
return 1;
}
/* Set close-on-exec (not really neede here) */
if (fcntl(cfd, F_SETFD, 1) == -1) {
perror("fcntl(F_SETFD)");
return 1;
}
md5_ctx_init(&ctx, cfd, NULL, 0);
do {
nread = read(fd, &block, MD5_DIGEST_BLOCKSIZE);
if (nread < 0) {
perror("read()");
return 1;
}
if (nread > 0) {
// TODO: Only last block md5!! How can I propagate it
to next op???
printf("block size: %d\n", nread);
md5_hash(&ctx, block, nread, digest);
}
} while (nread > 0);
md5_ctx_deinit(&ctx);
/* Print digest */
for (i = 0; i < 16; i++) {
printf("%02x", digest[i]);
}
printf(" %s\n", argv[1]);
/* Close the original descriptor */
if (close(cfd)) {
perror("close(cfd)");
return 1;
}
close(fd);
return 0;
}
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