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