lib/threshold.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <unistd.h>
   4 #include <fcntl.h>
   5 #include <sys/ioctl.h>
   6 #include <crypto/cryptodev.h>
   7 #include <openssl/aes.h>
   8 #include <openssl/engine.h>
   9 #include <openssl/hmac.h>
  10 #include <openssl/evp.h>
  11 #include "hash.h"
  12 #include "threshold.h"
  13
  14 void sha_hash(void* text, int size, void* digest)
  15 {
  16 SHA_CTX ctx;
  17
  18         SHA_Init(&ctx);
  19
  20         SHA_Update(&ctx, text, size);
  21
  22         SHA_Final(digest, &ctx);
  23 }
  24
  25 void aes_sha_combo(void* ctx, void* plaintext, void* ciphertext, int size, void* tag)
  26 {
  27 uint8_t iv[16];
  28 AES_KEY* key = ctx;
  29 HMAC_CTX hctx;
  30 unsigned int rlen = 20;
  31
  32         HMAC_CTX_init(&hctx);
  33         HMAC_Init_ex(&hctx, iv, 16, EVP_sha1(), NULL);
  34
  35         HMAC_Update(&hctx, plaintext, size);
  36
  37         HMAC_Final(&hctx, tag, &rlen);
  38         HMAC_CTX_cleanup(&hctx);
  39
  40         AES_cbc_encrypt(plaintext, ciphertext, size, key, iv, 1);
  41 }
  42
  43 int get_sha1_threshold()
  44 {
  45         return hash_test(CRYPTO_SHA1, sha_hash);
  46 }
  47
  48 int get_aes_sha1_threshold()
  49 {
  50 AES_KEY key;
  51 uint8_t ukey[16];
  52
  53         ENGINE_load_builtin_engines();
  54         ENGINE_register_all_complete();
  55
  56         memset(ukey, 0xaf, sizeof(ukey));
  57         AES_set_encrypt_key(ukey, 16*8, &key);
  58
  59         return aead_test(CRYPTO_AES_CBC, CRYPTO_SHA1, ukey, 16, &key, aes_sha_combo);
  60 }
  61