drivers/staging/skein/threefish_api.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/string.h>
   3 #include "threefish_api.h"
   4
   5 void threefish_set_key(struct threefish_key *key_ctx,
   6                        enum threefish_size state_size,
   7                        u64 *key_data, u64 *tweak)
   8 {
   9         int key_words = state_size / 64;
  10         int i;
  11         u64 parity = KEY_SCHEDULE_CONST;
  12
  13         key_ctx->tweak[0] = tweak[0];
  14         key_ctx->tweak[1] = tweak[1];
  15         key_ctx->tweak[2] = tweak[0] ^ tweak[1];
  16
  17         for (i = 0; i < key_words; i++) {
  18                 key_ctx->key[i] = key_data[i];
  19                 parity ^= key_data[i];
  20         }
  21         key_ctx->key[i] = parity;
  22         key_ctx->state_size = state_size;
  23 }
  24
  25 void threefish_encrypt_block_bytes(struct threefish_key *key_ctx, u8 *in,
  26                                    u8 *out)
  27 {
  28         u64 plain[SKEIN_MAX_STATE_WORDS];        /* max number of words*/
  29         u64 cipher[SKEIN_MAX_STATE_WORDS];
  30
  31         skein_get64_lsb_first(plain, in, key_ctx->state_size / 64);
  32         threefish_encrypt_block_words(key_ctx, plain, cipher);
  33         skein_put64_lsb_first(out, cipher, key_ctx->state_size / 8);
  34 }
  35
  36 void threefish_encrypt_block_words(struct threefish_key *key_ctx, u64 *in,
  37                                    u64 *out)
  38 {
  39         switch (key_ctx->state_size) {
  40         case THREEFISH_256:
  41                 threefish_encrypt_256(key_ctx, in, out);
  42                 break;
  43         case THREEFISH_512:
  44                 threefish_encrypt_512(key_ctx, in, out);
  45                 break;
  46         case THREEFISH_1024:
  47                 threefish_encrypt_1024(key_ctx, in, out);
  48                 break;
  49         }
  50 }
  51
  52 void threefish_decrypt_block_bytes(struct threefish_key *key_ctx, u8 *in,
  53                                    u8 *out)
  54 {
  55         u64 plain[SKEIN_MAX_STATE_WORDS];        /* max number of words*/
  56         u64 cipher[SKEIN_MAX_STATE_WORDS];
  57
  58         skein_get64_lsb_first(cipher, in, key_ctx->state_size / 64);
  59         threefish_decrypt_block_words(key_ctx, cipher, plain);
  60         skein_put64_lsb_first(out, plain, key_ctx->state_size / 8);
  61 }
  62
  63 void threefish_decrypt_block_words(struct threefish_key *key_ctx, u64 *in,
  64                                    u64 *out)
  65 {
  66         switch (key_ctx->state_size) {
  67         case THREEFISH_256:
  68                 threefish_decrypt_256(key_ctx, in, out);
  69                 break;
  70         case THREEFISH_512:
  71                 threefish_decrypt_512(key_ctx, in, out);
  72                 break;
  73         case THREEFISH_1024:
  74                 threefish_decrypt_1024(key_ctx, in, out);
  75                 break;
  76         }
  77 }
  78