/* * Glue Code for x86_64/AVX2 assembler optimized version of Serpent * * Copyright © 2012-2013 Jussi Kivilinna <jussi.kivilinna@mbnet.fi> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * */ #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/serpent.h> #include <crypto/xts.h> #include <asm/crypto/glue_helper.h> #include <asm/crypto/serpent-avx.h> #define SERPENT_AVX2_PARALLEL_BLOCKS 16 /* 16-way AVX2 parallel cipher functions */ asmlinkage void serpent_ecb_enc_16way(struct serpent_ctx *ctx, u8 *dst, const u8 *src); asmlinkage void serpent_ecb_dec_16way(struct serpent_ctx *ctx, u8 *dst, const u8 *src); asmlinkage void serpent_cbc_dec_16way(void *ctx, u128 *dst, const u128 *src); asmlinkage void serpent_ctr_16way(void *ctx, u128 *dst, const u128 *src, le128 *iv); asmlinkage void serpent_xts_enc_16way(struct serpent_ctx *ctx, u8 *dst, const u8 *src, le128 *iv); asmlinkage void serpent_xts_dec_16way(struct serpent_ctx *ctx, u8 *dst, const u8 *src, le128 *iv); static int serpent_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key, unsigned int keylen) { return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen); } static const struct common_glue_ctx serpent_enc = { .num_funcs = 3, .fpu_blocks_limit = 8, .funcs = { { .num_blocks = 16, .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_enc_16way) } }, { .num_blocks = 8, .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_enc_8way_avx) } }, { .num_blocks = 1, .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_encrypt) } } } }; static const struct common_glue_ctx serpent_ctr = { .num_funcs = 3, .fpu_blocks_limit = 8, .funcs = { { .num_blocks = 16, .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_ctr_16way) } }, { .num_blocks = 8, .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_ctr_8way_avx) } }, { .num_blocks = 1, .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(__serpent_crypt_ctr) } } } }; static const struct common_glue_ctx serpent_enc_xts = { .num_funcs = 3, .fpu_blocks_limit = 8, .funcs = { { .num_blocks = 16, .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc_16way) } }, { .num_blocks = 8, .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc_8way_avx) } }, { .num_blocks = 1, .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc) } } } }; static const struct common_glue_ctx serpent_dec = { .num_funcs = 3, .fpu_blocks_limit = 8, .funcs = { { .num_blocks = 16, .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_dec_16way) } }, { .num_blocks = 8, .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_dec_8way_avx) } }, { .num_blocks = 1, .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_decrypt) } } } }; static const struct common_glue_ctx serpent_dec_cbc = { .num_funcs = 3, .fpu_blocks_limit = 8, .funcs = { { .num_blocks = 16, .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_cbc_dec_16way) } }, { .num_blocks = 8, .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_cbc_dec_8way_avx) } }, { .num_blocks = 1, .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__serpent_decrypt) } } } }; static const struct common_glue_ctx serpent_dec_xts = { .num_funcs = 3, .fpu_blocks_limit = 8, .funcs = { { .num_blocks = 16, .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec_16way) } }, { .num_blocks = 8, .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec_8way_avx) } }, { .num_blocks = 1, .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec) } } } }; static int ecb_encrypt(struct skcipher_request *req) { return glue_ecb_req_128bit(&serpent_enc, req); } static int ecb_decrypt(struct skcipher_request *req) { return glue_ecb_req_128bit(&serpent_dec, req); } static int cbc_encrypt(struct skcipher_request *req) { return glue_cbc_encrypt_req_128bit(GLUE_FUNC_CAST(__serpent_encrypt), req); } static int cbc_decrypt(struct skcipher_request *req) { return glue_cbc_decrypt_req_128bit(&serpent_dec_cbc, req); } static int ctr_crypt(struct skcipher_request *req) { return glue_ctr_req_128bit(&serpent_ctr, req); } static int xts_encrypt(struct skcipher_request *req) { struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); struct serpent_xts_ctx *ctx = crypto_skcipher_ctx(tfm); return glue_xts_req_128bit(&serpent_enc_xts, req, XTS_TWEAK_CAST(__serpent_encrypt), &ctx->tweak_ctx, &ctx->crypt_ctx); } static int xts_decrypt(struct skcipher_request *req) { struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); struct serpent_xts_ctx *ctx = crypto_skcipher_ctx(tfm); return glue_xts_req_128bit(&serpent_dec_xts, req, XTS_TWEAK_CAST(__serpent_encrypt), &ctx->tweak_ctx, &ctx->crypt_ctx); } static struct skcipher_alg serpent_algs[] = { { .base.cra_name = "__ecb(serpent)", .base.cra_driver_name = "__ecb-serpent-avx2", .base.cra_priority = 600, .base.cra_flags = CRYPTO_ALG_INTERNAL, .base.cra_blocksize = SERPENT_BLOCK_SIZE, .base.cra_ctxsize = sizeof(struct serpent_ctx), .base.cra_module = THIS_MODULE, .min_keysize = SERPENT_MIN_KEY_SIZE, .max_keysize = SERPENT_MAX_KEY_SIZE, .setkey = serpent_setkey_skcipher, .encrypt = ecb_encrypt, .decrypt = ecb_decrypt, }, { .base.cra_name = "__cbc(serpent)", .base.cra_driver_name = "__cbc-serpent-avx2", .base.cra_priority = 600, .base.cra_flags = CRYPTO_ALG_INTERNAL, .base.cra_blocksize = SERPENT_BLOCK_SIZE, .base.cra_ctxsize = sizeof(struct serpent_ctx), .base.cra_module = THIS_MODULE, .min_keysize = SERPENT_MIN_KEY_SIZE, .max_keysize = SERPENT_MAX_KEY_SIZE, .ivsize = SERPENT_BLOCK_SIZE, .setkey = serpent_setkey_skcipher, .encrypt = cbc_encrypt, .decrypt = cbc_decrypt, }, { .base.cra_name = "__ctr(serpent)", .base.cra_driver_name = "__ctr-serpent-avx2", .base.cra_priority = 600, .base.cra_flags = CRYPTO_ALG_INTERNAL, .base.cra_blocksize = 1, .base.cra_ctxsize = sizeof(struct serpent_ctx), .base.cra_module = THIS_MODULE, .min_keysize = SERPENT_MIN_KEY_SIZE, .max_keysize = SERPENT_MAX_KEY_SIZE, .ivsize = SERPENT_BLOCK_SIZE, .chunksize = SERPENT_BLOCK_SIZE, .setkey = serpent_setkey_skcipher, .encrypt = ctr_crypt, .decrypt = ctr_crypt, }, { .base.cra_name = "__xts(serpent)", .base.cra_driver_name = "__xts-serpent-avx2", .base.cra_priority = 600, .base.cra_flags = CRYPTO_ALG_INTERNAL, .base.cra_blocksize = SERPENT_BLOCK_SIZE, .base.cra_ctxsize = sizeof(struct serpent_xts_ctx), .base.cra_module = THIS_MODULE, .min_keysize = 2 * SERPENT_MIN_KEY_SIZE, .max_keysize = 2 * SERPENT_MAX_KEY_SIZE, .ivsize = SERPENT_BLOCK_SIZE, .setkey = xts_serpent_setkey, .encrypt = xts_encrypt, .decrypt = xts_decrypt, }, }; static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)]; static int __init init(void) { const char *feature_name; if (!boot_cpu_has(X86_FEATURE_AVX2) || !boot_cpu_has(X86_FEATURE_OSXSAVE)) { pr_info("AVX2 instructions are not detected.\n"); return -ENODEV; } 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(serpent_algs, ARRAY_SIZE(serpent_algs), serpent_simd_algs); } static void __exit fini(void) { simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs), serpent_simd_algs); } module_init(init); module_exit(fini); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Serpent Cipher Algorithm, AVX2 optimized"); MODULE_ALIAS_CRYPTO("serpent"); MODULE_ALIAS_CRYPTO("serpent-asm");