282 lines
7.7 KiB
C
282 lines
7.7 KiB
C
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/*
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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/algapi.h>
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#include <crypto/internal/simd.h>
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#include <crypto/serpent.h>
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#include <crypto/xts.h>
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#include <asm/crypto/glue_helper.h>
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#include <asm/crypto/serpent-avx.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 int serpent_setkey_skcipher(struct crypto_skcipher *tfm,
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const u8 *key, unsigned int keylen)
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{
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return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen);
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}
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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 skcipher_request *req)
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{
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return glue_ecb_req_128bit(&serpent_enc, req);
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}
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static int ecb_decrypt(struct skcipher_request *req)
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{
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return glue_ecb_req_128bit(&serpent_dec, req);
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}
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static int cbc_encrypt(struct skcipher_request *req)
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{
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return glue_cbc_encrypt_req_128bit(GLUE_FUNC_CAST(__serpent_encrypt),
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req);
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}
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static int cbc_decrypt(struct skcipher_request *req)
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{
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return glue_cbc_decrypt_req_128bit(&serpent_dec_cbc, req);
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}
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static int ctr_crypt(struct skcipher_request *req)
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{
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return glue_ctr_req_128bit(&serpent_ctr, req);
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}
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static int xts_encrypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct serpent_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
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return glue_xts_req_128bit(&serpent_enc_xts, req,
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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 skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct serpent_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
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return glue_xts_req_128bit(&serpent_dec_xts, req,
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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 skcipher_alg serpent_algs[] = {
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{
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.base.cra_name = "__ecb(serpent)",
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.base.cra_driver_name = "__ecb-serpent-avx2",
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.base.cra_priority = 600,
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.base.cra_flags = CRYPTO_ALG_INTERNAL,
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.base.cra_blocksize = SERPENT_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct serpent_ctx),
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.base.cra_module = THIS_MODULE,
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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_skcipher,
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.encrypt = ecb_encrypt,
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.decrypt = ecb_decrypt,
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}, {
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.base.cra_name = "__cbc(serpent)",
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.base.cra_driver_name = "__cbc-serpent-avx2",
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.base.cra_priority = 600,
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.base.cra_flags = CRYPTO_ALG_INTERNAL,
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.base.cra_blocksize = SERPENT_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct serpent_ctx),
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.base.cra_module = THIS_MODULE,
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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_skcipher,
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.encrypt = cbc_encrypt,
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.decrypt = cbc_decrypt,
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}, {
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.base.cra_name = "__ctr(serpent)",
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.base.cra_driver_name = "__ctr-serpent-avx2",
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.base.cra_priority = 600,
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.base.cra_flags = CRYPTO_ALG_INTERNAL,
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.base.cra_blocksize = 1,
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.base.cra_ctxsize = sizeof(struct serpent_ctx),
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.base.cra_module = THIS_MODULE,
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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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.chunksize = SERPENT_BLOCK_SIZE,
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.setkey = serpent_setkey_skcipher,
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.encrypt = ctr_crypt,
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.decrypt = ctr_crypt,
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}, {
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.base.cra_name = "__xts(serpent)",
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.base.cra_driver_name = "__xts-serpent-avx2",
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.base.cra_priority = 600,
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.base.cra_flags = CRYPTO_ALG_INTERNAL,
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.base.cra_blocksize = SERPENT_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct serpent_xts_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = 2 * SERPENT_MIN_KEY_SIZE,
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.max_keysize = 2 * SERPENT_MAX_KEY_SIZE,
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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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static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)];
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static int __init init(void)
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{
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const char *feature_name;
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if (!boot_cpu_has(X86_FEATURE_AVX2) || !boot_cpu_has(X86_FEATURE_OSXSAVE)) {
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pr_info("AVX2 instructions are not detected.\n");
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return -ENODEV;
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}
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if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
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&feature_name)) {
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pr_info("CPU feature '%s' is not supported.\n", feature_name);
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return -ENODEV;
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}
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return simd_register_skciphers_compat(serpent_algs,
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ARRAY_SIZE(serpent_algs),
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serpent_simd_algs);
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}
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static void __exit fini(void)
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{
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simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs),
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serpent_simd_algs);
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}
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module_init(init);
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module_exit(fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Serpent Cipher Algorithm, AVX2 optimized");
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MODULE_ALIAS_CRYPTO("serpent");
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MODULE_ALIAS_CRYPTO("serpent-asm");
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