563 lines
16 KiB
C
563 lines
16 KiB
C
/*
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* Glue Code for x86_64/AVX2 assembler optimized version of Serpent
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*
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* Copyright © 2012-2013 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/crypto.h>
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#include <linux/err.h>
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#include <crypto/ablk_helper.h>
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#include <crypto/algapi.h>
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#include <crypto/ctr.h>
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#include <crypto/lrw.h>
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#include <crypto/xts.h>
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#include <crypto/serpent.h>
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#include <asm/xcr.h>
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#include <asm/xsave.h>
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#include <asm/crypto/serpent-avx.h>
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#include <asm/crypto/glue_helper.h>
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#define SERPENT_AVX2_PARALLEL_BLOCKS 16
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/* 16-way AVX2 parallel cipher functions */
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asmlinkage void serpent_ecb_enc_16way(struct serpent_ctx *ctx, u8 *dst,
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const u8 *src);
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asmlinkage void serpent_ecb_dec_16way(struct serpent_ctx *ctx, u8 *dst,
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const u8 *src);
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asmlinkage void serpent_cbc_dec_16way(void *ctx, u128 *dst, const u128 *src);
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asmlinkage void serpent_ctr_16way(void *ctx, u128 *dst, const u128 *src,
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le128 *iv);
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asmlinkage void serpent_xts_enc_16way(struct serpent_ctx *ctx, u8 *dst,
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const u8 *src, le128 *iv);
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asmlinkage void serpent_xts_dec_16way(struct serpent_ctx *ctx, u8 *dst,
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const u8 *src, le128 *iv);
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static const struct common_glue_ctx serpent_enc = {
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.num_funcs = 3,
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.fpu_blocks_limit = 8,
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.funcs = { {
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.num_blocks = 16,
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.fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_enc_16way) }
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}, {
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.num_blocks = 8,
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.fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_enc_8way_avx) }
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}, {
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.num_blocks = 1,
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.fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_encrypt) }
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} }
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};
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static const struct common_glue_ctx serpent_ctr = {
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.num_funcs = 3,
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.fpu_blocks_limit = 8,
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.funcs = { {
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.num_blocks = 16,
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.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_ctr_16way) }
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}, {
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.num_blocks = 8,
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.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_ctr_8way_avx) }
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}, {
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.num_blocks = 1,
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.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(__serpent_crypt_ctr) }
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} }
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};
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static const struct common_glue_ctx serpent_enc_xts = {
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.num_funcs = 3,
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.fpu_blocks_limit = 8,
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.funcs = { {
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.num_blocks = 16,
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.fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc_16way) }
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}, {
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.num_blocks = 8,
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.fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc_8way_avx) }
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}, {
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.num_blocks = 1,
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.fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc) }
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} }
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};
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static const struct common_glue_ctx serpent_dec = {
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.num_funcs = 3,
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.fpu_blocks_limit = 8,
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.funcs = { {
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.num_blocks = 16,
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.fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_dec_16way) }
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}, {
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.num_blocks = 8,
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.fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_dec_8way_avx) }
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}, {
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.num_blocks = 1,
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.fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_decrypt) }
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} }
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};
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static const struct common_glue_ctx serpent_dec_cbc = {
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.num_funcs = 3,
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.fpu_blocks_limit = 8,
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.funcs = { {
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.num_blocks = 16,
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.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_cbc_dec_16way) }
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}, {
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.num_blocks = 8,
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.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_cbc_dec_8way_avx) }
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}, {
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.num_blocks = 1,
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.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__serpent_decrypt) }
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} }
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};
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static const struct common_glue_ctx serpent_dec_xts = {
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.num_funcs = 3,
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.fpu_blocks_limit = 8,
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.funcs = { {
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.num_blocks = 16,
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.fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec_16way) }
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}, {
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.num_blocks = 8,
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.fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec_8way_avx) }
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}, {
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.num_blocks = 1,
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.fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec) }
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} }
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};
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static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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return glue_ecb_crypt_128bit(&serpent_enc, desc, dst, src, nbytes);
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}
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static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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return glue_ecb_crypt_128bit(&serpent_dec, desc, dst, src, nbytes);
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}
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static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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return glue_cbc_encrypt_128bit(GLUE_FUNC_CAST(__serpent_encrypt), desc,
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dst, src, nbytes);
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}
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static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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return glue_cbc_decrypt_128bit(&serpent_dec_cbc, desc, dst, src,
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nbytes);
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}
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static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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return glue_ctr_crypt_128bit(&serpent_ctr, desc, dst, src, nbytes);
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}
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static inline bool serpent_fpu_begin(bool fpu_enabled, unsigned int nbytes)
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{
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/* since reusing AVX functions, starts using FPU at 8 parallel blocks */
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return glue_fpu_begin(SERPENT_BLOCK_SIZE, 8, NULL, fpu_enabled, nbytes);
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}
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static inline void serpent_fpu_end(bool fpu_enabled)
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{
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glue_fpu_end(fpu_enabled);
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}
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struct crypt_priv {
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struct serpent_ctx *ctx;
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bool fpu_enabled;
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};
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static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
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{
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const unsigned int bsize = SERPENT_BLOCK_SIZE;
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struct crypt_priv *ctx = priv;
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int i;
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ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes);
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if (nbytes >= SERPENT_AVX2_PARALLEL_BLOCKS * bsize) {
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serpent_ecb_enc_16way(ctx->ctx, srcdst, srcdst);
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srcdst += bsize * SERPENT_AVX2_PARALLEL_BLOCKS;
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nbytes -= bsize * SERPENT_AVX2_PARALLEL_BLOCKS;
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}
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while (nbytes >= SERPENT_PARALLEL_BLOCKS * bsize) {
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serpent_ecb_enc_8way_avx(ctx->ctx, srcdst, srcdst);
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srcdst += bsize * SERPENT_PARALLEL_BLOCKS;
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nbytes -= bsize * SERPENT_PARALLEL_BLOCKS;
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}
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for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
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__serpent_encrypt(ctx->ctx, srcdst, srcdst);
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}
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static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
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{
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const unsigned int bsize = SERPENT_BLOCK_SIZE;
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struct crypt_priv *ctx = priv;
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int i;
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ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes);
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if (nbytes >= SERPENT_AVX2_PARALLEL_BLOCKS * bsize) {
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serpent_ecb_dec_16way(ctx->ctx, srcdst, srcdst);
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srcdst += bsize * SERPENT_AVX2_PARALLEL_BLOCKS;
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nbytes -= bsize * SERPENT_AVX2_PARALLEL_BLOCKS;
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}
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while (nbytes >= SERPENT_PARALLEL_BLOCKS * bsize) {
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serpent_ecb_dec_8way_avx(ctx->ctx, srcdst, srcdst);
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srcdst += bsize * SERPENT_PARALLEL_BLOCKS;
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nbytes -= bsize * SERPENT_PARALLEL_BLOCKS;
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}
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for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
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__serpent_decrypt(ctx->ctx, srcdst, srcdst);
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}
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static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct serpent_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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be128 buf[SERPENT_AVX2_PARALLEL_BLOCKS];
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struct crypt_priv crypt_ctx = {
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.ctx = &ctx->serpent_ctx,
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.fpu_enabled = false,
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};
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struct lrw_crypt_req req = {
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.tbuf = buf,
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.tbuflen = sizeof(buf),
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.table_ctx = &ctx->lrw_table,
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.crypt_ctx = &crypt_ctx,
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.crypt_fn = encrypt_callback,
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};
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int ret;
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desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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ret = lrw_crypt(desc, dst, src, nbytes, &req);
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serpent_fpu_end(crypt_ctx.fpu_enabled);
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return ret;
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}
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static int lrw_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct serpent_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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be128 buf[SERPENT_AVX2_PARALLEL_BLOCKS];
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struct crypt_priv crypt_ctx = {
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.ctx = &ctx->serpent_ctx,
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.fpu_enabled = false,
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};
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struct lrw_crypt_req req = {
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.tbuf = buf,
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.tbuflen = sizeof(buf),
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.table_ctx = &ctx->lrw_table,
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.crypt_ctx = &crypt_ctx,
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.crypt_fn = decrypt_callback,
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};
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int ret;
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desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
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ret = lrw_crypt(desc, dst, src, nbytes, &req);
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serpent_fpu_end(crypt_ctx.fpu_enabled);
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return ret;
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}
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static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct serpent_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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return glue_xts_crypt_128bit(&serpent_enc_xts, desc, dst, src, nbytes,
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XTS_TWEAK_CAST(__serpent_encrypt),
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&ctx->tweak_ctx, &ctx->crypt_ctx);
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}
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static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct serpent_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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return glue_xts_crypt_128bit(&serpent_dec_xts, desc, dst, src, nbytes,
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XTS_TWEAK_CAST(__serpent_encrypt),
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&ctx->tweak_ctx, &ctx->crypt_ctx);
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}
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static struct crypto_alg srp_algs[10] = { {
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.cra_name = "__ecb-serpent-avx2",
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.cra_driver_name = "__driver-ecb-serpent-avx2",
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.cra_priority = 0,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = SERPENT_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct serpent_ctx),
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.cra_alignmask = 0,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(srp_algs[0].cra_list),
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.cra_u = {
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.blkcipher = {
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.min_keysize = SERPENT_MIN_KEY_SIZE,
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.max_keysize = SERPENT_MAX_KEY_SIZE,
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.setkey = serpent_setkey,
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.encrypt = ecb_encrypt,
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.decrypt = ecb_decrypt,
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},
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},
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}, {
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.cra_name = "__cbc-serpent-avx2",
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.cra_driver_name = "__driver-cbc-serpent-avx2",
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.cra_priority = 0,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = SERPENT_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct serpent_ctx),
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.cra_alignmask = 0,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(srp_algs[1].cra_list),
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.cra_u = {
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.blkcipher = {
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.min_keysize = SERPENT_MIN_KEY_SIZE,
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.max_keysize = SERPENT_MAX_KEY_SIZE,
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.setkey = serpent_setkey,
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.encrypt = cbc_encrypt,
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.decrypt = cbc_decrypt,
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},
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},
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}, {
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.cra_name = "__ctr-serpent-avx2",
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.cra_driver_name = "__driver-ctr-serpent-avx2",
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.cra_priority = 0,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = 1,
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.cra_ctxsize = sizeof(struct serpent_ctx),
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.cra_alignmask = 0,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(srp_algs[2].cra_list),
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.cra_u = {
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.blkcipher = {
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.min_keysize = SERPENT_MIN_KEY_SIZE,
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.max_keysize = SERPENT_MAX_KEY_SIZE,
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.ivsize = SERPENT_BLOCK_SIZE,
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.setkey = serpent_setkey,
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.encrypt = ctr_crypt,
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.decrypt = ctr_crypt,
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},
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},
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}, {
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.cra_name = "__lrw-serpent-avx2",
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.cra_driver_name = "__driver-lrw-serpent-avx2",
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.cra_priority = 0,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = SERPENT_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct serpent_lrw_ctx),
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.cra_alignmask = 0,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(srp_algs[3].cra_list),
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.cra_exit = lrw_serpent_exit_tfm,
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.cra_u = {
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.blkcipher = {
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.min_keysize = SERPENT_MIN_KEY_SIZE +
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SERPENT_BLOCK_SIZE,
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.max_keysize = SERPENT_MAX_KEY_SIZE +
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SERPENT_BLOCK_SIZE,
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.ivsize = SERPENT_BLOCK_SIZE,
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.setkey = lrw_serpent_setkey,
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.encrypt = lrw_encrypt,
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.decrypt = lrw_decrypt,
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},
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},
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}, {
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.cra_name = "__xts-serpent-avx2",
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.cra_driver_name = "__driver-xts-serpent-avx2",
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.cra_priority = 0,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = SERPENT_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct serpent_xts_ctx),
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.cra_alignmask = 0,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(srp_algs[4].cra_list),
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.cra_u = {
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.blkcipher = {
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.min_keysize = SERPENT_MIN_KEY_SIZE * 2,
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.max_keysize = SERPENT_MAX_KEY_SIZE * 2,
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.ivsize = SERPENT_BLOCK_SIZE,
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.setkey = xts_serpent_setkey,
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.encrypt = xts_encrypt,
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.decrypt = xts_decrypt,
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},
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},
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}, {
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.cra_name = "ecb(serpent)",
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.cra_driver_name = "ecb-serpent-avx2",
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.cra_priority = 600,
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.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
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.cra_blocksize = SERPENT_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct async_helper_ctx),
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.cra_alignmask = 0,
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.cra_type = &crypto_ablkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(srp_algs[5].cra_list),
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.cra_init = ablk_init,
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.cra_exit = ablk_exit,
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.cra_u = {
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.ablkcipher = {
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.min_keysize = SERPENT_MIN_KEY_SIZE,
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.max_keysize = SERPENT_MAX_KEY_SIZE,
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.setkey = ablk_set_key,
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.encrypt = ablk_encrypt,
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.decrypt = ablk_decrypt,
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},
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},
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}, {
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.cra_name = "cbc(serpent)",
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.cra_driver_name = "cbc-serpent-avx2",
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.cra_priority = 600,
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.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
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.cra_blocksize = SERPENT_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct async_helper_ctx),
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.cra_alignmask = 0,
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|
.cra_type = &crypto_ablkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_list = LIST_HEAD_INIT(srp_algs[6].cra_list),
|
|
.cra_init = ablk_init,
|
|
.cra_exit = ablk_exit,
|
|
.cra_u = {
|
|
.ablkcipher = {
|
|
.min_keysize = SERPENT_MIN_KEY_SIZE,
|
|
.max_keysize = SERPENT_MAX_KEY_SIZE,
|
|
.ivsize = SERPENT_BLOCK_SIZE,
|
|
.setkey = ablk_set_key,
|
|
.encrypt = __ablk_encrypt,
|
|
.decrypt = ablk_decrypt,
|
|
},
|
|
},
|
|
}, {
|
|
.cra_name = "ctr(serpent)",
|
|
.cra_driver_name = "ctr-serpent-avx2",
|
|
.cra_priority = 600,
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
|
|
.cra_blocksize = 1,
|
|
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_ablkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_list = LIST_HEAD_INIT(srp_algs[7].cra_list),
|
|
.cra_init = ablk_init,
|
|
.cra_exit = ablk_exit,
|
|
.cra_u = {
|
|
.ablkcipher = {
|
|
.min_keysize = SERPENT_MIN_KEY_SIZE,
|
|
.max_keysize = SERPENT_MAX_KEY_SIZE,
|
|
.ivsize = SERPENT_BLOCK_SIZE,
|
|
.setkey = ablk_set_key,
|
|
.encrypt = ablk_encrypt,
|
|
.decrypt = ablk_encrypt,
|
|
.geniv = "chainiv",
|
|
},
|
|
},
|
|
}, {
|
|
.cra_name = "lrw(serpent)",
|
|
.cra_driver_name = "lrw-serpent-avx2",
|
|
.cra_priority = 600,
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
|
|
.cra_blocksize = SERPENT_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_ablkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_list = LIST_HEAD_INIT(srp_algs[8].cra_list),
|
|
.cra_init = ablk_init,
|
|
.cra_exit = ablk_exit,
|
|
.cra_u = {
|
|
.ablkcipher = {
|
|
.min_keysize = SERPENT_MIN_KEY_SIZE +
|
|
SERPENT_BLOCK_SIZE,
|
|
.max_keysize = SERPENT_MAX_KEY_SIZE +
|
|
SERPENT_BLOCK_SIZE,
|
|
.ivsize = SERPENT_BLOCK_SIZE,
|
|
.setkey = ablk_set_key,
|
|
.encrypt = ablk_encrypt,
|
|
.decrypt = ablk_decrypt,
|
|
},
|
|
},
|
|
}, {
|
|
.cra_name = "xts(serpent)",
|
|
.cra_driver_name = "xts-serpent-avx2",
|
|
.cra_priority = 600,
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
|
|
.cra_blocksize = SERPENT_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct async_helper_ctx),
|
|
.cra_alignmask = 0,
|
|
.cra_type = &crypto_ablkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_list = LIST_HEAD_INIT(srp_algs[9].cra_list),
|
|
.cra_init = ablk_init,
|
|
.cra_exit = ablk_exit,
|
|
.cra_u = {
|
|
.ablkcipher = {
|
|
.min_keysize = SERPENT_MIN_KEY_SIZE * 2,
|
|
.max_keysize = SERPENT_MAX_KEY_SIZE * 2,
|
|
.ivsize = SERPENT_BLOCK_SIZE,
|
|
.setkey = ablk_set_key,
|
|
.encrypt = ablk_encrypt,
|
|
.decrypt = ablk_decrypt,
|
|
},
|
|
},
|
|
} };
|
|
|
|
static int __init init(void)
|
|
{
|
|
u64 xcr0;
|
|
|
|
if (!cpu_has_avx2 || !cpu_has_osxsave) {
|
|
pr_info("AVX2 instructions are not detected.\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
|
|
if ((xcr0 & (XSTATE_SSE | XSTATE_YMM)) != (XSTATE_SSE | XSTATE_YMM)) {
|
|
pr_info("AVX detected but unusable.\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
return crypto_register_algs(srp_algs, ARRAY_SIZE(srp_algs));
|
|
}
|
|
|
|
static void __exit fini(void)
|
|
{
|
|
crypto_unregister_algs(srp_algs, ARRAY_SIZE(srp_algs));
|
|
}
|
|
|
|
module_init(init);
|
|
module_exit(fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Serpent Cipher Algorithm, AVX2 optimized");
|
|
MODULE_ALIAS("serpent");
|
|
MODULE_ALIAS("serpent-asm");
|