drivers/staging/skein/threefishApi.c

   1
   2
   3 #include <linux/string.h>
   4 #include <threefishApi.h>
   5
   6 void threefish_set_key(struct threefish_key *key_ctx,
   7                        enum threefish_size state_size,
   8                        u64 *key_data, u64 *tweak)
   9 {
  10         int key_words = state_size / 64;
  11         int i;
  12         u64 parity = KEY_SCHEDULE_CONST;
  13
  14         key_ctx->tweak[0] = tweak[0];
  15         key_ctx->tweak[1] = tweak[1];
  16         key_ctx->tweak[2] = tweak[0] ^ tweak[1];
  17
  18         for (i = 0; i < key_words; i++) {
  19                 key_ctx->key[i] = key_data[i];
  20                 parity ^= key_data[i];
  21         }
  22         key_ctx->key[i] = parity;
  23         key_ctx->state_size = state_size;
  24 }
  25
  26 void threefish_encrypt_block_bytes(struct threefish_key *key_ctx, u8 *in,
  27                                    u8 *out)
  28 {
  29         u64 plain[SKEIN_MAX_STATE_WORDS];        /* max number of words*/
  30         u64 cipher[SKEIN_MAX_STATE_WORDS];
  31
  32         skein_get64_lsb_first(plain, in, key_ctx->state_size / 64);
  33         threefish_encrypt_block_words(key_ctx, plain, cipher);
  34         skein_put64_lsb_first(out, cipher, key_ctx->state_size / 8);
  35 }
  36
  37 void threefish_encrypt_block_words(struct threefish_key *key_ctx, u64 *in,
  38                                    u64 *out)
  39 {
  40         switch (key_ctx->state_size) {
  41         case THREEFISH_256:
  42                 threefish_encrypt_256(key_ctx, in, out);
  43                 break;
  44         case THREEFISH_512:
  45                 threefish_encrypt_512(key_ctx, in, out);
  46                 break;
  47         case THREEFISH_1024:
  48                 threefish_encrypt_1024(key_ctx, in, out);
  49                 break;
  50         }
  51 }
  52
  53 void threefish_decrypt_block_bytes(struct threefish_key *key_ctx, u8 *in,
  54                                    u8 *out)
  55 {
  56         u64 plain[SKEIN_MAX_STATE_WORDS];        /* max number of words*/
  57         u64 cipher[SKEIN_MAX_STATE_WORDS];
  58
  59         skein_get64_lsb_first(cipher, in, key_ctx->state_size / 64);
  60         threefish_decrypt_block_words(key_ctx, cipher, plain);
  61         skein_put64_lsb_first(out, plain, key_ctx->state_size / 8);
  62 }
  63
  64 void threefish_decrypt_block_words(struct threefish_key *key_ctx, u64 *in,
  65                                    u64 *out)
  66 {
  67         switch (key_ctx->state_size) {
  68         case THREEFISH_256:
  69                 threefish_decrypt_256(key_ctx, in, out);
  70                 break;
  71         case THREEFISH_512:
  72                 threefish_decrypt_512(key_ctx, in, out);
  73                 break;
  74         case THREEFISH_1024:
  75                 threefish_decrypt_1024(key_ctx, in, out);
  76                 break;
  77         }
  78 }
  79