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Diffstat (limited to 'example2.c')
| -rw-r--r-- | example2.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/example2.c b/example2.c new file mode 100644 index 0000000..d4c49f0 --- /dev/null +++ b/example2.c @@ -0,0 +1,182 @@ +/* + * Demo on how to use OpenBSD /dev/crypto device. + * + * Author: Michal Ludvig <michal@logix.cz> + * http://www.logix.cz/michal + * + * Note: by default OpenBSD doesn't allow using + * /dev/crypto if there is no hardware accelerator + * for a given algorithm. To change this you'll have to + * set cryptodevallowsoft=1 in + * /usr/src/sys/crypto/cryptodev.c and rebuild your kernel. + */ +#include <stdio.h> +#include <string.h> +#include <unistd.h> +#include <fcntl.h> + +#include <sys/ioctl.h> +//#include <crypto/cryptodev.h> +#include "cryptodev.h" + +#define DATA_SIZE 4096 +#define BLOCK_SIZE 16 +#define KEY_SIZE 16 + +static int +test_crypto(int cfd) +{ + struct { + uint8_t in[DATA_SIZE], + encrypted[DATA_SIZE], + decrypted[DATA_SIZE], + iv[BLOCK_SIZE], + key[KEY_SIZE]; + } data; + struct session_op sess; + struct crypt_op cryp; + uint8_t mac[HASH_MAX_LEN]; + uint8_t oldmac[HASH_MAX_LEN]; + uint8_t def_out[] = "\x75\x0c\x78\x3e\x6a\xb0\xb5\x03\xea\xa8\x6e\x31\x0a\x5d\xb7\x38"; + int i; + + memset(&sess, 0, sizeof(sess)); + memset(&cryp, 0, sizeof(cryp)); + + /* Use the garbage that is on the stack :-) */ + /* memset(&data, 0, sizeof(data)); */ + + /* Get crypto session for AES128 */ + sess.cipher = 0; + sess.mac = CRYPTO_SHA1_HMAC; + sess.mackeylen = 4; + sess.mackey = (uint8_t*)"Jefe"; + if (ioctl(cfd, CIOCGSESSION, &sess)) { + perror("ioctl(CIOCGSESSION)"); + return 1; + } + + memset(mac, 0, sizeof(mac)); + + cryp.ses = sess.ses; + cryp.len = sizeof("what do ya want for nothing?")-1; + cryp.src = "what do ya want for nothing?"; + cryp.mac = mac; + cryp.op = COP_ENCRYPT; + if (ioctl(cfd, CIOCCRYPT, &cryp)) { + perror("ioctl(CIOCCRYPT)"); + return 1; + } + + if (memcmp(mac, def_out, sizeof(mac))!=0) { + printf("mac: "); + for (i=0;i<SHA1_HASH_LEN;i++) { + printf("%.2x", (uint8_t)mac[i]); + } + puts("\n"); + fprintf(stderr, "HMAC test 1: failed\n"); + } else { + fprintf(stderr, "HMAC test 1: passed\n"); + } +return 0; + sess.cipher = CRYPTO_AES_CBC; + sess.mac = CRYPTO_SHA1_HMAC; + sess.keylen = KEY_SIZE; + sess.key = data.key; + sess.mackeylen = 16; + sess.mackey = (uint8_t*)"\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"; + if (ioctl(cfd, CIOCGSESSION, &sess)) { + perror("ioctl(CIOCGSESSION)"); + return 1; + } + + /* Encrypt data.in to data.encrypted */ + cryp.ses = sess.ses; + cryp.len = sizeof(data.in); + cryp.src = data.in; + cryp.dst = data.encrypted; + cryp.iv = data.iv; + cryp.mac = mac; + cryp.op = COP_ENCRYPT; + if (ioctl(cfd, CIOCCRYPT, &cryp)) { + perror("ioctl(CIOCCRYPT)"); + return 1; + } + + memcpy(oldmac, mac, sizeof(mac)); + + /* Decrypt data.encrypted to data.decrypted */ + cryp.src = data.encrypted; + cryp.dst = data.decrypted; + cryp.op = COP_DECRYPT; + if (ioctl(cfd, CIOCCRYPT, &cryp)) { + perror("ioctl(CIOCCRYPT)"); + return 1; + } + + /* Verify the result */ + if (memcmp(data.in, data.decrypted, sizeof(data.in)) != 0) { + fprintf(stderr, + "FAIL: Decrypted data are different from the input data.\n"); + return 1; + } else + printf("Crypt Test: passed\n"); + + if (memcmp(mac, oldmac, sizeof(mac)) != 0) { + fprintf(stderr, + "FAIL: Hash in decrypted data different than in encrypted.\n"); + return 1; + } else + printf("HMAC Test 2: passed\n"); + + /* Finish crypto session */ + if (ioctl(cfd, CIOCFSESSION, &sess.ses)) { + perror("ioctl(CIOCFSESSION)"); + return 1; + } + + return 0; +} + +int +main() +{ + int fd = -1, cfd = -1; + + /* Open the crypto device */ + fd = open("/dev/crypto", O_RDWR, 0); + if (fd < 0) { + perror("open(/dev/crypto)"); + return 1; + } + + /* Clone file descriptor */ + if (ioctl(fd, CRIOGET, &cfd)) { + perror("ioctl(CRIOGET)"); + 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_crypto(cfd)) + return 1; + + /* Close cloned descriptor */ + if (close(cfd)) { + perror("close(cfd)"); + return 1; + } + + /* Close the original descriptor */ + if (close(fd)) { + perror("close(fd)"); + return 1; + } + + return 0; +} |