| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Glue Code for AVX assembler version of Twofish Cipher |
| * |
| * Copyright (C) 2012 Johannes Goetzfried |
| * <Johannes.Goetzfried@informatik.stud.uni-erlangen.de> |
| * |
| * Copyright © 2013 Jussi Kivilinna <jussi.kivilinna@iki.fi> |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/crypto.h> |
| #include <linux/err.h> |
| #include <crypto/algapi.h> |
| #include <crypto/internal/simd.h> |
| #include <crypto/twofish.h> |
| #include <crypto/xts.h> |
| #include <asm/crypto/glue_helper.h> |
| #include <asm/crypto/twofish.h> |
| |
| #define TWOFISH_PARALLEL_BLOCKS 8 |
| |
| /* 8-way parallel cipher functions */ |
| asmlinkage void twofish_ecb_enc_8way(struct twofish_ctx *ctx, u8 *dst, |
| const u8 *src); |
| asmlinkage void twofish_ecb_dec_8way(struct twofish_ctx *ctx, u8 *dst, |
| const u8 *src); |
| |
| asmlinkage void twofish_cbc_dec_8way(struct twofish_ctx *ctx, u8 *dst, |
| const u8 *src); |
| asmlinkage void twofish_ctr_8way(struct twofish_ctx *ctx, u8 *dst, |
| const u8 *src, le128 *iv); |
| |
| asmlinkage void twofish_xts_enc_8way(struct twofish_ctx *ctx, u8 *dst, |
| const u8 *src, le128 *iv); |
| asmlinkage void twofish_xts_dec_8way(struct twofish_ctx *ctx, u8 *dst, |
| const u8 *src, le128 *iv); |
| |
| static int twofish_setkey_skcipher(struct crypto_skcipher *tfm, |
| const u8 *key, unsigned int keylen) |
| { |
| return twofish_setkey(&tfm->base, key, keylen); |
| } |
| |
| static inline void twofish_enc_blk_3way(struct twofish_ctx *ctx, u8 *dst, |
| const u8 *src) |
| { |
| __twofish_enc_blk_3way(ctx, dst, src, false); |
| } |
| |
| static void twofish_xts_enc(void *ctx, u128 *dst, const u128 *src, le128 *iv) |
| { |
| glue_xts_crypt_128bit_one(ctx, dst, src, iv, |
| GLUE_FUNC_CAST(twofish_enc_blk)); |
| } |
| |
| static void twofish_xts_dec(void *ctx, u128 *dst, const u128 *src, le128 *iv) |
| { |
| glue_xts_crypt_128bit_one(ctx, dst, src, iv, |
| GLUE_FUNC_CAST(twofish_dec_blk)); |
| } |
| |
| struct twofish_xts_ctx { |
| struct twofish_ctx tweak_ctx; |
| struct twofish_ctx crypt_ctx; |
| }; |
| |
| static int xts_twofish_setkey(struct crypto_skcipher *tfm, const u8 *key, |
| unsigned int keylen) |
| { |
| struct twofish_xts_ctx *ctx = crypto_skcipher_ctx(tfm); |
| u32 *flags = &tfm->base.crt_flags; |
| int err; |
| |
| err = xts_verify_key(tfm, key, keylen); |
| if (err) |
| return err; |
| |
| /* first half of xts-key is for crypt */ |
| err = __twofish_setkey(&ctx->crypt_ctx, key, keylen / 2, flags); |
| if (err) |
| return err; |
| |
| /* second half of xts-key is for tweak */ |
| return __twofish_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2, |
| flags); |
| } |
| |
| static const struct common_glue_ctx twofish_enc = { |
| .num_funcs = 3, |
| .fpu_blocks_limit = TWOFISH_PARALLEL_BLOCKS, |
| |
| .funcs = { { |
| .num_blocks = TWOFISH_PARALLEL_BLOCKS, |
| .fn_u = { .ecb = GLUE_FUNC_CAST(twofish_ecb_enc_8way) } |
| }, { |
| .num_blocks = 3, |
| .fn_u = { .ecb = GLUE_FUNC_CAST(twofish_enc_blk_3way) } |
| }, { |
| .num_blocks = 1, |
| .fn_u = { .ecb = GLUE_FUNC_CAST(twofish_enc_blk) } |
| } } |
| }; |
| |
| static const struct common_glue_ctx twofish_ctr = { |
| .num_funcs = 3, |
| .fpu_blocks_limit = TWOFISH_PARALLEL_BLOCKS, |
| |
| .funcs = { { |
| .num_blocks = TWOFISH_PARALLEL_BLOCKS, |
| .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(twofish_ctr_8way) } |
| }, { |
| .num_blocks = 3, |
| .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(twofish_enc_blk_ctr_3way) } |
| }, { |
| .num_blocks = 1, |
| .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(twofish_enc_blk_ctr) } |
| } } |
| }; |
| |
| static const struct common_glue_ctx twofish_enc_xts = { |
| .num_funcs = 2, |
| .fpu_blocks_limit = TWOFISH_PARALLEL_BLOCKS, |
| |
| .funcs = { { |
| .num_blocks = TWOFISH_PARALLEL_BLOCKS, |
| .fn_u = { .xts = GLUE_XTS_FUNC_CAST(twofish_xts_enc_8way) } |
| }, { |
| .num_blocks = 1, |
| .fn_u = { .xts = GLUE_XTS_FUNC_CAST(twofish_xts_enc) } |
| } } |
| }; |
| |
| static const struct common_glue_ctx twofish_dec = { |
| .num_funcs = 3, |
| .fpu_blocks_limit = TWOFISH_PARALLEL_BLOCKS, |
| |
| .funcs = { { |
| .num_blocks = TWOFISH_PARALLEL_BLOCKS, |
| .fn_u = { .ecb = GLUE_FUNC_CAST(twofish_ecb_dec_8way) } |
| }, { |
| .num_blocks = 3, |
| .fn_u = { .ecb = GLUE_FUNC_CAST(twofish_dec_blk_3way) } |
| }, { |
| .num_blocks = 1, |
| .fn_u = { .ecb = GLUE_FUNC_CAST(twofish_dec_blk) } |
| } } |
| }; |
| |
| static const struct common_glue_ctx twofish_dec_cbc = { |
| .num_funcs = 3, |
| .fpu_blocks_limit = TWOFISH_PARALLEL_BLOCKS, |
| |
| .funcs = { { |
| .num_blocks = TWOFISH_PARALLEL_BLOCKS, |
| .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(twofish_cbc_dec_8way) } |
| }, { |
| .num_blocks = 3, |
| .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(twofish_dec_blk_cbc_3way) } |
| }, { |
| .num_blocks = 1, |
| .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(twofish_dec_blk) } |
| } } |
| }; |
| |
| static const struct common_glue_ctx twofish_dec_xts = { |
| .num_funcs = 2, |
| .fpu_blocks_limit = TWOFISH_PARALLEL_BLOCKS, |
| |
| .funcs = { { |
| .num_blocks = TWOFISH_PARALLEL_BLOCKS, |
| .fn_u = { .xts = GLUE_XTS_FUNC_CAST(twofish_xts_dec_8way) } |
| }, { |
| .num_blocks = 1, |
| .fn_u = { .xts = GLUE_XTS_FUNC_CAST(twofish_xts_dec) } |
| } } |
| }; |
| |
| static int ecb_encrypt(struct skcipher_request *req) |
| { |
| return glue_ecb_req_128bit(&twofish_enc, req); |
| } |
| |
| static int ecb_decrypt(struct skcipher_request *req) |
| { |
| return glue_ecb_req_128bit(&twofish_dec, req); |
| } |
| |
| static int cbc_encrypt(struct skcipher_request *req) |
| { |
| return glue_cbc_encrypt_req_128bit(GLUE_FUNC_CAST(twofish_enc_blk), |
| req); |
| } |
| |
| static int cbc_decrypt(struct skcipher_request *req) |
| { |
| return glue_cbc_decrypt_req_128bit(&twofish_dec_cbc, req); |
| } |
| |
| static int ctr_crypt(struct skcipher_request *req) |
| { |
| return glue_ctr_req_128bit(&twofish_ctr, req); |
| } |
| |
| static int xts_encrypt(struct skcipher_request *req) |
| { |
| struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
| struct twofish_xts_ctx *ctx = crypto_skcipher_ctx(tfm); |
| |
| return glue_xts_req_128bit(&twofish_enc_xts, req, |
| XTS_TWEAK_CAST(twofish_enc_blk), |
| &ctx->tweak_ctx, &ctx->crypt_ctx, false); |
| } |
| |
| static int xts_decrypt(struct skcipher_request *req) |
| { |
| struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
| struct twofish_xts_ctx *ctx = crypto_skcipher_ctx(tfm); |
| |
| return glue_xts_req_128bit(&twofish_dec_xts, req, |
| XTS_TWEAK_CAST(twofish_enc_blk), |
| &ctx->tweak_ctx, &ctx->crypt_ctx, true); |
| } |
| |
| static struct skcipher_alg twofish_algs[] = { |
| { |
| .base.cra_name = "__ecb(twofish)", |
| .base.cra_driver_name = "__ecb-twofish-avx", |
| .base.cra_priority = 400, |
| .base.cra_flags = CRYPTO_ALG_INTERNAL, |
| .base.cra_blocksize = TF_BLOCK_SIZE, |
| .base.cra_ctxsize = sizeof(struct twofish_ctx), |
| .base.cra_module = THIS_MODULE, |
| .min_keysize = TF_MIN_KEY_SIZE, |
| .max_keysize = TF_MAX_KEY_SIZE, |
| .setkey = twofish_setkey_skcipher, |
| .encrypt = ecb_encrypt, |
| .decrypt = ecb_decrypt, |
| }, { |
| .base.cra_name = "__cbc(twofish)", |
| .base.cra_driver_name = "__cbc-twofish-avx", |
| .base.cra_priority = 400, |
| .base.cra_flags = CRYPTO_ALG_INTERNAL, |
| .base.cra_blocksize = TF_BLOCK_SIZE, |
| .base.cra_ctxsize = sizeof(struct twofish_ctx), |
| .base.cra_module = THIS_MODULE, |
| .min_keysize = TF_MIN_KEY_SIZE, |
| .max_keysize = TF_MAX_KEY_SIZE, |
| .ivsize = TF_BLOCK_SIZE, |
| .setkey = twofish_setkey_skcipher, |
| .encrypt = cbc_encrypt, |
| .decrypt = cbc_decrypt, |
| }, { |
| .base.cra_name = "__ctr(twofish)", |
| .base.cra_driver_name = "__ctr-twofish-avx", |
| .base.cra_priority = 400, |
| .base.cra_flags = CRYPTO_ALG_INTERNAL, |
| .base.cra_blocksize = 1, |
| .base.cra_ctxsize = sizeof(struct twofish_ctx), |
| .base.cra_module = THIS_MODULE, |
| .min_keysize = TF_MIN_KEY_SIZE, |
| .max_keysize = TF_MAX_KEY_SIZE, |
| .ivsize = TF_BLOCK_SIZE, |
| .chunksize = TF_BLOCK_SIZE, |
| .setkey = twofish_setkey_skcipher, |
| .encrypt = ctr_crypt, |
| .decrypt = ctr_crypt, |
| }, { |
| .base.cra_name = "__xts(twofish)", |
| .base.cra_driver_name = "__xts-twofish-avx", |
| .base.cra_priority = 400, |
| .base.cra_flags = CRYPTO_ALG_INTERNAL, |
| .base.cra_blocksize = TF_BLOCK_SIZE, |
| .base.cra_ctxsize = sizeof(struct twofish_xts_ctx), |
| .base.cra_module = THIS_MODULE, |
| .min_keysize = 2 * TF_MIN_KEY_SIZE, |
| .max_keysize = 2 * TF_MAX_KEY_SIZE, |
| .ivsize = TF_BLOCK_SIZE, |
| .setkey = xts_twofish_setkey, |
| .encrypt = xts_encrypt, |
| .decrypt = xts_decrypt, |
| }, |
| }; |
| |
| static struct simd_skcipher_alg *twofish_simd_algs[ARRAY_SIZE(twofish_algs)]; |
| |
| static int __init twofish_init(void) |
| { |
| const char *feature_name; |
| |
| if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, &feature_name)) { |
| pr_info("CPU feature '%s' is not supported.\n", feature_name); |
| return -ENODEV; |
| } |
| |
| return simd_register_skciphers_compat(twofish_algs, |
| ARRAY_SIZE(twofish_algs), |
| twofish_simd_algs); |
| } |
| |
| static void __exit twofish_exit(void) |
| { |
| simd_unregister_skciphers(twofish_algs, ARRAY_SIZE(twofish_algs), |
| twofish_simd_algs); |
| } |
| |
| module_init(twofish_init); |
| module_exit(twofish_exit); |
| |
| MODULE_DESCRIPTION("Twofish Cipher Algorithm, AVX optimized"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS_CRYPTO("twofish"); |
