examples/cipher.c

   1 /*
   2  * Demo on how to use /dev/crypto device for ciphering.
   3  *
   4  * Placed under public domain.
   5  *
   6  */
   7 #include <stdio.h>
   8 #include <string.h>
   9 #include <unistd.h>
  10 #include <fcntl.h>
  11
  12 #include <sys/ioctl.h>
  13 #include <crypto/cryptodev.h>
  14
  15 #define DATA_SIZE       4096
  16 #define BLOCK_SIZE      16
  17 #define KEY_SIZE        16
  18
  19 static int
  20 test_crypto(int cfd)
  21 {
  22         char plaintext[DATA_SIZE];
  23         char ciphertext[DATA_SIZE];
  24         char iv[BLOCK_SIZE];
  25         char key[KEY_SIZE];
  26
  27         struct session_op sess;
  28         struct crypt_op cryp;
  29
  30         memset(&sess, 0, sizeof(sess));
  31         memset(&cryp, 0, sizeof(cryp));
  32
  33         memset(plaintext, 0x15,  sizeof(plaintext));
  34         memset(key, 0x33,  sizeof(key));
  35         memset(iv, 0x03,  sizeof(iv));
  36
  37         /* Get crypto session for AES128 */
  38         sess.cipher = CRYPTO_AES_CBC;
  39         sess.keylen = KEY_SIZE;
  40         sess.key = key;
  41         if (ioctl(cfd, CIOCGSESSION, &sess)) {
  42                 perror("ioctl(CIOCGSESSION)");
  43                 return 1;
  44         }
  45
  46         /* Encrypt data.in to data.encrypted */
  47         cryp.ses = sess.ses;
  48         cryp.len = sizeof(plaintext);
  49         cryp.src = plaintext;
  50         cryp.dst = ciphertext;
  51         cryp.iv = iv;
  52         cryp.op = COP_ENCRYPT;
  53         if (ioctl(cfd, CIOCCRYPT, &cryp)) {
  54                 perror("ioctl(CIOCCRYPT)");
  55                 return 1;
  56         }
  57
  58         if (ioctl(cfd, CIOCGSESSION, &sess)) {
  59                 perror("ioctl(CIOCGSESSION)");
  60                 return 1;
  61         }
  62
  63         /* Decrypt data.encrypted to data.decrypted */
  64         cryp.ses = sess.ses;
  65         cryp.len = sizeof(plaintext);
  66         cryp.src = ciphertext;
  67         cryp.dst = ciphertext;
  68         cryp.iv = iv;
  69         cryp.op = COP_DECRYPT;
  70         if (ioctl(cfd, CIOCCRYPT, &cryp)) {
  71                 perror("ioctl(CIOCCRYPT)");
  72                 return 1;
  73         }
  74
  75         /* Verify the result */
  76         if (memcmp(plaintext, ciphertext, sizeof(plaintext)) != 0) {
  77                 fprintf(stderr,
  78                         "FAIL: Decrypted data are different from the input data.\n");
  79                 return 1;
  80         } else
  81                 printf("Test passed\n");
  82
  83         /* Finish crypto session */
  84         if (ioctl(cfd, CIOCFSESSION, &sess.ses)) {
  85                 perror("ioctl(CIOCFSESSION)");
  86                 return 1;
  87         }
  88
  89         return 0;
  90 }
  91
  92 static int test_aes(int cfd)
  93 {
  94         char plaintext1[BLOCK_SIZE];
  95         char ciphertext1[BLOCK_SIZE] = { 0xdf, 0x55, 0x6a, 0x33, 0x43, 0x8d, 0xb8, 0x7b, 0xc4, 0x1b, 0x17, 0x52, 0xc5, 0x5e, 0x5e, 0x49 };
  96         char iv1[BLOCK_SIZE];
  97         char key1[KEY_SIZE] = { 0xff, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
  98         char plaintext2[BLOCK_SIZE] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x00 };
  99         char ciphertext2[BLOCK_SIZE] = { 0xb7, 0x97, 0x2b, 0x39, 0x41, 0xc4, 0x4b, 0x90, 0xaf, 0xa7, 0xb2, 0x64, 0xbf, 0xba, 0x73, 0x87 };
 100         char iv2[BLOCK_SIZE];
 101         char key2[KEY_SIZE];
 102
 103         struct session_op sess;
 104         struct crypt_op cryp;
 105
 106         memset(&sess, 0, sizeof(sess));
 107         memset(&cryp, 0, sizeof(cryp));
 108
 109         memset(plaintext1, 0x0, sizeof(plaintext1));
 110         memset(iv1, 0x0, sizeof(iv1));
 111
 112         /* Get crypto session for AES128 */
 113         sess.cipher = CRYPTO_AES_CBC;
 114         sess.keylen = KEY_SIZE;
 115         sess.key = key1;
 116         if (ioctl(cfd, CIOCGSESSION, &sess)) {
 117                 perror("ioctl(CIOCGSESSION)");
 118                 return 1;
 119         }
 120
 121         /* Encrypt data.in to data.encrypted */
 122         cryp.ses = sess.ses;
 123         cryp.len = sizeof(plaintext1);
 124         cryp.src = plaintext1;
 125         cryp.dst = plaintext1;
 126         cryp.iv = iv1;
 127         cryp.op = COP_ENCRYPT;
 128         if (ioctl(cfd, CIOCCRYPT, &cryp)) {
 129                 perror("ioctl(CIOCCRYPT)");
 130                 return 1;
 131         }
 132
 133         /* Verify the result */
 134         if (memcmp(plaintext1, ciphertext1, sizeof(plaintext1)) != 0) {
 135                 fprintf(stderr,
 136                         "FAIL: Decrypted data are different from the input data.\n");
 137                 return 1;
 138         }
 139
 140         /* Test 2 */
 141
 142         memset(key2, 0x0, sizeof(key2));
 143         memset(iv2, 0x0, sizeof(iv2));
 144
 145         /* Get crypto session for AES128 */
 146         sess.cipher = CRYPTO_AES_CBC;
 147         sess.keylen = KEY_SIZE;
 148         sess.key = key2;
 149         if (ioctl(cfd, CIOCGSESSION, &sess)) {
 150                 perror("ioctl(CIOCGSESSION)");
 151                 return 1;
 152         }
 153
 154         /* Encrypt data.in to data.encrypted */
 155         cryp.ses = sess.ses;
 156         cryp.len = sizeof(plaintext2);
 157         cryp.src = plaintext2;
 158         cryp.dst = plaintext2;
 159         cryp.iv = iv2;
 160         cryp.op = COP_ENCRYPT;
 161         if (ioctl(cfd, CIOCCRYPT, &cryp)) {
 162                 perror("ioctl(CIOCCRYPT)");
 163                 return 1;
 164         }
 165
 166         /* Verify the result */
 167         if (memcmp(plaintext2, ciphertext2, sizeof(plaintext2)) != 0) {
 168                 fprintf(stderr,
 169                         "FAIL: Decrypted data are different from the input data.\n");
 170                 return 1;
 171         }
 172
 173         printf("AES Test passed\n");
 174
 175         /* Finish crypto session */
 176         if (ioctl(cfd, CIOCFSESSION, &sess.ses)) {
 177                 perror("ioctl(CIOCFSESSION)");
 178                 return 1;
 179         }
 180
 181         return 0;
 182 }
 183
 184 int
 185 main()
 186 {
 187         int fd = -1, cfd = -1;
 188
 189         /* Open the crypto device */
 190         fd = open("/dev/crypto", O_RDWR, 0);
 191         if (fd < 0) {
 192                 perror("open(/dev/crypto)");
 193                 return 1;
 194         }
 195
 196         /* Clone file descriptor */
 197         if (ioctl(fd, CRIOGET, &cfd)) {
 198                 perror("ioctl(CRIOGET)");
 199                 return 1;
 200         }
 201
 202         /* Set close-on-exec (not really neede here) */
 203         if (fcntl(cfd, F_SETFD, 1) == -1) {
 204                 perror("fcntl(F_SETFD)");
 205                 return 1;
 206         }
 207
 208         /* Run the test itself */
 209         if (test_aes(cfd))
 210                 return 1;
 211
 212         if (test_crypto(cfd))
 213                 return 1;
 214
 215         /* Close cloned descriptor */
 216         if (close(cfd)) {
 217                 perror("close(cfd)");
 218                 return 1;
 219         }
 220
 221         /* Close the original descriptor */
 222         if (close(fd)) {
 223                 perror("close(fd)");
 224                 return 1;
 225         }
 226
 227         return 0;
 228 }
 229