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#include <linux/string.h>
#include <skein.h>
#include <threefishApi.h>
/***************************** Skein_256 ******************************/
void skein_256_process_block(struct skein_256_ctx *ctx, const u8 *blk_ptr,
size_t blk_cnt, size_t byte_cnt_add)
{
struct threefish_key key;
u64 tweak[2];
int i;
u64 w[SKEIN_256_STATE_WORDS]; /* local copy of input block */
u64 words[3];
Skein_assert(blk_cnt != 0); /* never call with blk_cnt == 0! */
tweak[0] = ctx->h.T[0];
tweak[1] = ctx->h.T[1];
do {
u64 carry = byte_cnt_add;
words[0] = tweak[0] & 0xffffffffL;
words[1] = ((tweak[0] >> 32) & 0xffffffffL);
words[2] = (tweak[1] & 0xffffffffL);
for (i = 0; i < 3; i++) {
carry += words[i];
words[i] = carry;
carry >>= 32;
}
tweak[0] = words[0] & 0xffffffffL;
tweak[0] |= (words[1] & 0xffffffffL) << 32;
tweak[1] |= words[2] & 0xffffffffL;
threefish_set_key(&key, THREEFISH_256, ctx->X, tweak);
/* get input block in little-endian format */
Skein_Get64_LSB_First(w, blk_ptr, SKEIN_256_STATE_WORDS);
threefish_encrypt_block_words(&key, w, ctx->X);
blk_ptr += SKEIN_256_BLOCK_BYTES;
/* do the final "feedforward" xor, update ctx chaining vars */
ctx->X[0] = ctx->X[0] ^ w[0];
ctx->X[1] = ctx->X[1] ^ w[1];
ctx->X[2] = ctx->X[2] ^ w[2];
ctx->X[3] = ctx->X[3] ^ w[3];
tweak[1] &= ~SKEIN_T1_FLAG_FIRST;
} while (--blk_cnt);
ctx->h.T[0] = tweak[0];
ctx->h.T[1] = tweak[1];
}
void skein_512_process_block(struct skein_512_ctx *ctx, const u8 *blk_ptr,
size_t blk_cnt, size_t byte_cnt_add)
{
struct threefish_key key;
u64 tweak[2];
int i;
u64 words[3];
u64 w[SKEIN_512_STATE_WORDS]; /* local copy of input block */
Skein_assert(blk_cnt != 0); /* never call with blk_cnt == 0! */
tweak[0] = ctx->h.T[0];
tweak[1] = ctx->h.T[1];
do {
u64 carry = byte_cnt_add;
words[0] = tweak[0] & 0xffffffffL;
words[1] = ((tweak[0] >> 32) & 0xffffffffL);
words[2] = (tweak[1] & 0xffffffffL);
for (i = 0; i < 3; i++) {
carry += words[i];
words[i] = carry;
carry >>= 32;
}
tweak[0] = words[0] & 0xffffffffL;
tweak[0] |= (words[1] & 0xffffffffL) << 32;
tweak[1] |= words[2] & 0xffffffffL;
threefish_set_key(&key, THREEFISH_512, ctx->X, tweak);
/* get input block in little-endian format */
Skein_Get64_LSB_First(w, blk_ptr, SKEIN_512_STATE_WORDS);
threefish_encrypt_block_words(&key, w, ctx->X);
blk_ptr += SKEIN_512_BLOCK_BYTES;
/* do the final "feedforward" xor, update ctx chaining vars */
ctx->X[0] = ctx->X[0] ^ w[0];
ctx->X[1] = ctx->X[1] ^ w[1];
ctx->X[2] = ctx->X[2] ^ w[2];
ctx->X[3] = ctx->X[3] ^ w[3];
ctx->X[4] = ctx->X[4] ^ w[4];
ctx->X[5] = ctx->X[5] ^ w[5];
ctx->X[6] = ctx->X[6] ^ w[6];
ctx->X[7] = ctx->X[7] ^ w[7];
tweak[1] &= ~SKEIN_T1_FLAG_FIRST;
} while (--blk_cnt);
ctx->h.T[0] = tweak[0];
ctx->h.T[1] = tweak[1];
}
void skein_1024_process_block(struct skein_1024_ctx *ctx, const u8 *blk_ptr,
size_t blk_cnt, size_t byte_cnt_add)
{
struct threefish_key key;
u64 tweak[2];
int i;
u64 words[3];
u64 w[SKEIN1024_STATE_WORDS]; /* local copy of input block */
Skein_assert(blk_cnt != 0); /* never call with blk_cnt == 0! */
tweak[0] = ctx->h.T[0];
tweak[1] = ctx->h.T[1];
do {
u64 carry = byte_cnt_add;
words[0] = tweak[0] & 0xffffffffL;
words[1] = ((tweak[0] >> 32) & 0xffffffffL);
words[2] = (tweak[1] & 0xffffffffL);
for (i = 0; i < 3; i++) {
carry += words[i];
words[i] = carry;
carry >>= 32;
}
tweak[0] = words[0] & 0xffffffffL;
tweak[0] |= (words[1] & 0xffffffffL) << 32;
tweak[1] |= words[2] & 0xffffffffL;
threefish_set_key(&key, THREEFISH_1024, ctx->X, tweak);
/* get input block in little-endian format */
Skein_Get64_LSB_First(w, blk_ptr, SKEIN1024_STATE_WORDS);
threefish_encrypt_block_words(&key, w, ctx->X);
blk_ptr += SKEIN1024_BLOCK_BYTES;
/* do the final "feedforward" xor, update ctx chaining vars */
ctx->X[0] = ctx->X[0] ^ w[0];
ctx->X[1] = ctx->X[1] ^ w[1];
ctx->X[2] = ctx->X[2] ^ w[2];
ctx->X[3] = ctx->X[3] ^ w[3];
ctx->X[4] = ctx->X[4] ^ w[4];
ctx->X[5] = ctx->X[5] ^ w[5];
ctx->X[6] = ctx->X[6] ^ w[6];
ctx->X[7] = ctx->X[7] ^ w[7];
ctx->X[8] = ctx->X[8] ^ w[8];
ctx->X[9] = ctx->X[9] ^ w[9];
ctx->X[10] = ctx->X[10] ^ w[10];
ctx->X[11] = ctx->X[11] ^ w[11];
ctx->X[12] = ctx->X[12] ^ w[12];
ctx->X[13] = ctx->X[13] ^ w[13];
ctx->X[14] = ctx->X[14] ^ w[14];
ctx->X[15] = ctx->X[15] ^ w[15];
tweak[1] &= ~SKEIN_T1_FLAG_FIRST;
} while (--blk_cnt);
ctx->h.T[0] = tweak[0];
ctx->h.T[1] = tweak[1];
}
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