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aes.c
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aes.c
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/*
* 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 "aes.h"
#define KEY_SIZE 16
int aes_ctx_init(struct cryptodev_ctx* ctx, int cfd, const uint8_t *key, unsigned int key_size)
{
#ifdef CIOCGSESSINFO
struct session_info_op siop;
#endif
memset(ctx, 0, sizeof(*ctx));
ctx->cfd = cfd;
ctx->sess.cipher = CRYPTO_AES_CBC;
ctx->sess.keylen = key_size;
ctx->sess.key = (void*)key;
if (ioctl(ctx->cfd, CIOCGSESSION, &ctx->sess)) {
perror("ioctl(CIOCGSESSION)");
return -1;
}
#ifdef CIOCGSESSINFO
memset(&siop, 0, sizeof(siop));
siop.ses = ctx->sess.ses;
if (ioctl(ctx->cfd, CIOCGSESSINFO, &siop)) {
perror("ioctl(CIOCGSESSINFO)");
return -1;
}
printf("Got %s with driver %s\n",
siop.cipher_info.cra_name, siop.cipher_info.cra_driver_name);
if (!(siop.flags & SIOP_FLAG_KERNEL_DRIVER_ONLY)) {
printf("Note: This is not an accelerated cipher\n");
}
/*printf("Alignmask is %x\n", (unsigned int)siop.alignmask); */
ctx->alignmask = siop.alignmask;
#endif
return 0;
}
void aes_ctx_deinit(struct cryptodev_ctx* ctx)
{
if (ioctl(ctx->cfd, CIOCFSESSION, &ctx->sess.ses)) {
perror("ioctl(CIOCFSESSION)");
}
}
int
aes_encrypt(struct cryptodev_ctx* ctx, const void* iv, const void* plaintext, void* ciphertext, size_t size)
{
struct crypt_op cryp;
void* p;
/* check plaintext and ciphertext alignment */
if (ctx->alignmask) {
p = (void*)(((unsigned long)plaintext + ctx->alignmask) & ~ctx->alignmask);
if (plaintext != p) {
fprintf(stderr, "plaintext is not aligned\n");
return -1;
}
p = (void*)(((unsigned long)ciphertext + ctx->alignmask) & ~ctx->alignmask);
if (ciphertext != p) {
fprintf(stderr, "ciphertext 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*)plaintext;
cryp.dst = ciphertext;
cryp.iv = (void*)iv;
cryp.op = COP_ENCRYPT;
if (ioctl(ctx->cfd, CIOCCRYPT, &cryp)) {
perror("ioctl(CIOCCRYPT)");
return -1;
}
return 0;
}
int
aes_decrypt(struct cryptodev_ctx* ctx, const void* iv, const void* ciphertext, void* plaintext, size_t size)
{
struct crypt_op cryp;
void* p;
/* check plaintext and ciphertext alignment */
if (ctx->alignmask) {
p = (void*)(((unsigned long)plaintext + ctx->alignmask) & ~ctx->alignmask);
if (plaintext != p) {
fprintf(stderr, "plaintext is not aligned\n");
return -1;
}
p = (void*)(((unsigned long)ciphertext + ctx->alignmask) & ~ctx->alignmask);
if (ciphertext != p) {
fprintf(stderr, "ciphertext 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*)ciphertext;
cryp.dst = plaintext;
cryp.iv = (void*)iv;
cryp.op = COP_DECRYPT;
if (ioctl(ctx->cfd, CIOCCRYPT, &cryp)) {
perror("ioctl(CIOCCRYPT)");
return -1;
}
return 0;
}
static int test_aes(int cfd)
{
char plaintext1_raw[AES_BLOCK_SIZE + 63], *plaintext1;
char ciphertext1[AES_BLOCK_SIZE] = { 0xdf, 0x55, 0x6a, 0x33, 0x43, 0x8d, 0xb8, 0x7b, 0xc4, 0x1b, 0x17, 0x52, 0xc5, 0x5e, 0x5e, 0x49 };
char iv1[AES_BLOCK_SIZE];
uint8_t key1[KEY_SIZE] = { 0xff, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
char plaintext2_data[AES_BLOCK_SIZE] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x00 };
char plaintext2_raw[AES_BLOCK_SIZE + 63], *plaintext2;
char ciphertext2[AES_BLOCK_SIZE] = { 0xb7, 0x97, 0x2b, 0x39, 0x41, 0xc4, 0x4b, 0x90, 0xaf, 0xa7, 0xb2, 0x64, 0xbf, 0xba, 0x73, 0x87 };
char iv2[AES_BLOCK_SIZE];
uint8_t key2[KEY_SIZE];
struct cryptodev_ctx ctx;
aes_ctx_init(&ctx, cfd, key1, sizeof(key1));
if (ctx.alignmask)
plaintext1 = (char *)(((unsigned long)plaintext1_raw + ctx.alignmask) & ~ctx.alignmask);
else
plaintext1 = plaintext1_raw;
memset(plaintext1, 0x0, AES_BLOCK_SIZE);
memset(iv1, 0x0, sizeof(iv1));
aes_encrypt(&ctx, iv1, plaintext1, plaintext1, AES_BLOCK_SIZE);
/* Verify the result */
if (memcmp(plaintext1, ciphertext1, AES_BLOCK_SIZE) != 0) {
fprintf(stderr,
"FAIL: Decrypted data are different from the input data.\n");
return -1;
}
aes_ctx_deinit(&ctx);
/* Test 2 */
memset(key2, 0x0, sizeof(key2));
memset(iv2, 0x0, sizeof(iv2));
aes_ctx_init(&ctx, cfd, key2, sizeof(key2));
if (ctx.alignmask) {
plaintext2 = (char *)(((unsigned long)plaintext2_raw + ctx.alignmask) & ~ctx.alignmask);
} else {
plaintext2 = plaintext2_raw;
}
memcpy(plaintext2, plaintext2_data, AES_BLOCK_SIZE);
/* Encrypt data.in to data.encrypted */
aes_encrypt(&ctx, iv2, plaintext2, plaintext2, AES_BLOCK_SIZE);
/* Verify the result */
if (memcmp(plaintext2, ciphertext2, AES_BLOCK_SIZE) != 0) {
int i;
fprintf(stderr,
"FAIL: Decrypted data are different from the input data.\n");
printf("plaintext:");
for (i = 0; i < AES_BLOCK_SIZE; i++) {
printf("%02x ", plaintext2[i]);
}
printf("ciphertext:");
for (i = 0; i < AES_BLOCK_SIZE; i++) {
printf("%02x ", ciphertext2[i]);
}
printf("\n");
return 1;
}
aes_ctx_deinit(&ctx);
printf("AES Test passed\n");
return 0;
}
int
main()
{
int cfd = -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;
}
/* Run the test itself */
if (test_aes(cfd))
return 1;
/* Close the original descriptor */
if (close(cfd)) {
perror("close(cfd)");
return 1;
}
return 0;
}