// 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(const void *ctx, u8 *dst, const u8 *src); asmlinkage void twofish_ecb_dec_8way(const void *ctx, u8 *dst, const u8 *src); asmlinkage void twofish_cbc_dec_8way(const void *ctx, u8 *dst, const u8 *src); asmlinkage void twofish_ctr_8way(const void *ctx, u8 *dst, const u8 *src, le128 *iv); asmlinkage void twofish_xts_enc_8way(const void *ctx, u8 *dst, const u8 *src, le128 *iv); asmlinkage void twofish_xts_dec_8way(const void *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(const void *ctx, u8 *dst, const u8 *src) { __twofish_enc_blk_3way(ctx, dst, src, false); } static void twofish_xts_enc(const void *ctx, u8 *dst, const u8 *src, le128 *iv) { glue_xts_crypt_128bit_one(ctx, dst, src, iv, twofish_enc_blk); } static void twofish_xts_dec(const void *ctx, u8 *dst, const u8 *src, le128 *iv) { glue_xts_crypt_128bit_one(ctx, dst, src, iv, 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); 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); if (err) return err; /* second half of xts-key is for tweak */ return __twofish_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2); } 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 = twofish_ecb_enc_8way } }, { .num_blocks = 3, .fn_u = { .ecb = twofish_enc_blk_3way } }, { .num_blocks = 1, .fn_u = { .ecb = 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 = twofish_ctr_8way } }, { .num_blocks = 3, .fn_u = { .ctr = twofish_enc_blk_ctr_3way } }, { .num_blocks = 1, .fn_u = { .ctr = 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 = twofish_xts_enc_8way } }, { .num_blocks = 1, .fn_u = { .xts = 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 = twofish_ecb_dec_8way } }, { .num_blocks = 3, .fn_u = { .ecb = twofish_dec_blk_3way } }, { .num_blocks = 1, .fn_u = { .ecb = 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 = twofish_cbc_dec_8way } }, { .num_blocks = 3, .fn_u = { .cbc = twofish_dec_blk_cbc_3way } }, { .num_blocks = 1, .fn_u = { .cbc = 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 = twofish_xts_dec_8way } }, { .num_blocks = 1, .fn_u = { .xts = 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(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, 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, 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");