79 lines
2 KiB
C
79 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/string.h>
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#include "threefish_api.h"
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void threefish_set_key(struct threefish_key *key_ctx,
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enum threefish_size state_size,
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u64 *key_data, u64 *tweak)
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{
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int key_words = state_size / 64;
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int i;
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u64 parity = KEY_SCHEDULE_CONST;
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key_ctx->tweak[0] = tweak[0];
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key_ctx->tweak[1] = tweak[1];
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key_ctx->tweak[2] = tweak[0] ^ tweak[1];
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for (i = 0; i < key_words; i++) {
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key_ctx->key[i] = key_data[i];
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parity ^= key_data[i];
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}
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key_ctx->key[i] = parity;
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key_ctx->state_size = state_size;
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}
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void threefish_encrypt_block_bytes(struct threefish_key *key_ctx, u8 *in,
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u8 *out)
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{
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u64 plain[SKEIN_MAX_STATE_WORDS]; /* max number of words*/
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u64 cipher[SKEIN_MAX_STATE_WORDS];
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skein_get64_lsb_first(plain, in, key_ctx->state_size / 64);
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threefish_encrypt_block_words(key_ctx, plain, cipher);
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skein_put64_lsb_first(out, cipher, key_ctx->state_size / 8);
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}
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void threefish_encrypt_block_words(struct threefish_key *key_ctx, u64 *in,
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u64 *out)
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{
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switch (key_ctx->state_size) {
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case THREEFISH_256:
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threefish_encrypt_256(key_ctx, in, out);
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break;
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case THREEFISH_512:
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threefish_encrypt_512(key_ctx, in, out);
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break;
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case THREEFISH_1024:
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threefish_encrypt_1024(key_ctx, in, out);
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break;
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}
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}
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void threefish_decrypt_block_bytes(struct threefish_key *key_ctx, u8 *in,
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u8 *out)
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{
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u64 plain[SKEIN_MAX_STATE_WORDS]; /* max number of words*/
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u64 cipher[SKEIN_MAX_STATE_WORDS];
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skein_get64_lsb_first(cipher, in, key_ctx->state_size / 64);
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threefish_decrypt_block_words(key_ctx, cipher, plain);
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skein_put64_lsb_first(out, plain, key_ctx->state_size / 8);
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}
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void threefish_decrypt_block_words(struct threefish_key *key_ctx, u64 *in,
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u64 *out)
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{
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switch (key_ctx->state_size) {
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case THREEFISH_256:
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threefish_decrypt_256(key_ctx, in, out);
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break;
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case THREEFISH_512:
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threefish_decrypt_512(key_ctx, in, out);
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break;
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case THREEFISH_1024:
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threefish_decrypt_1024(key_ctx, in, out);
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break;
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}
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}
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