kernel/drivers/staging/skein/threefish_api.c

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