1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Glue Code for the AVX assembler implementation of the Cast6 Cipher 4 * 5 * Copyright (C) 2012 Johannes Goetzfried 6 * <Johannes.Goetzfried@informatik.stud.uni-erlangen.de> 7 * 8 * Copyright © 2013 Jussi Kivilinna <jussi.kivilinna@iki.fi> 9 */ 10 11 #include <linux/module.h> 12 #include <linux/types.h> 13 #include <linux/crypto.h> 14 #include <linux/err.h> 15 #include <crypto/algapi.h> 16 #include <crypto/cast6.h> 17 #include <crypto/internal/simd.h> 18 19 #include "ecb_cbc_helpers.h" 20 21 #define CAST6_PARALLEL_BLOCKS 8 22 23 asmlinkage void cast6_ecb_enc_8way(const void *ctx, u8 *dst, const u8 *src); 24 asmlinkage void cast6_ecb_dec_8way(const void *ctx, u8 *dst, const u8 *src); 25 26 asmlinkage void cast6_cbc_dec_8way(const void *ctx, u8 *dst, const u8 *src); 27 28 static int cast6_setkey_skcipher(struct crypto_skcipher *tfm, 29 const u8 *key, unsigned int keylen) 30 { 31 return cast6_setkey(&tfm->base, key, keylen); 32 } 33 34 static int ecb_encrypt(struct skcipher_request *req) 35 { 36 ECB_WALK_START(req, CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS); 37 ECB_BLOCK(CAST6_PARALLEL_BLOCKS, cast6_ecb_enc_8way); 38 ECB_BLOCK(1, __cast6_encrypt); 39 ECB_WALK_END(); 40 } 41 42 static int ecb_decrypt(struct skcipher_request *req) 43 { 44 ECB_WALK_START(req, CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS); 45 ECB_BLOCK(CAST6_PARALLEL_BLOCKS, cast6_ecb_dec_8way); 46 ECB_BLOCK(1, __cast6_decrypt); 47 ECB_WALK_END(); 48 } 49 50 static int cbc_encrypt(struct skcipher_request *req) 51 { 52 CBC_WALK_START(req, CAST6_BLOCK_SIZE, -1); 53 CBC_ENC_BLOCK(__cast6_encrypt); 54 CBC_WALK_END(); 55 } 56 57 static int cbc_decrypt(struct skcipher_request *req) 58 { 59 CBC_WALK_START(req, CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS); 60 CBC_DEC_BLOCK(CAST6_PARALLEL_BLOCKS, cast6_cbc_dec_8way); 61 CBC_DEC_BLOCK(1, __cast6_decrypt); 62 CBC_WALK_END(); 63 } 64 65 static struct skcipher_alg cast6_algs[] = { 66 { 67 .base.cra_name = "__ecb(cast6)", 68 .base.cra_driver_name = "__ecb-cast6-avx", 69 .base.cra_priority = 200, 70 .base.cra_flags = CRYPTO_ALG_INTERNAL, 71 .base.cra_blocksize = CAST6_BLOCK_SIZE, 72 .base.cra_ctxsize = sizeof(struct cast6_ctx), 73 .base.cra_module = THIS_MODULE, 74 .min_keysize = CAST6_MIN_KEY_SIZE, 75 .max_keysize = CAST6_MAX_KEY_SIZE, 76 .setkey = cast6_setkey_skcipher, 77 .encrypt = ecb_encrypt, 78 .decrypt = ecb_decrypt, 79 }, { 80 .base.cra_name = "__cbc(cast6)", 81 .base.cra_driver_name = "__cbc-cast6-avx", 82 .base.cra_priority = 200, 83 .base.cra_flags = CRYPTO_ALG_INTERNAL, 84 .base.cra_blocksize = CAST6_BLOCK_SIZE, 85 .base.cra_ctxsize = sizeof(struct cast6_ctx), 86 .base.cra_module = THIS_MODULE, 87 .min_keysize = CAST6_MIN_KEY_SIZE, 88 .max_keysize = CAST6_MAX_KEY_SIZE, 89 .ivsize = CAST6_BLOCK_SIZE, 90 .setkey = cast6_setkey_skcipher, 91 .encrypt = cbc_encrypt, 92 .decrypt = cbc_decrypt, 93 }, 94 }; 95 96 static struct simd_skcipher_alg *cast6_simd_algs[ARRAY_SIZE(cast6_algs)]; 97 98 static int __init cast6_init(void) 99 { 100 const char *feature_name; 101 102 if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, 103 &feature_name)) { 104 pr_info("CPU feature '%s' is not supported.\n", feature_name); 105 return -ENODEV; 106 } 107 108 return simd_register_skciphers_compat(cast6_algs, 109 ARRAY_SIZE(cast6_algs), 110 cast6_simd_algs); 111 } 112 113 static void __exit cast6_exit(void) 114 { 115 simd_unregister_skciphers(cast6_algs, ARRAY_SIZE(cast6_algs), 116 cast6_simd_algs); 117 } 118 119 module_init(cast6_init); 120 module_exit(cast6_exit); 121 122 MODULE_DESCRIPTION("Cast6 Cipher Algorithm, AVX optimized"); 123 MODULE_LICENSE("GPL"); 124 MODULE_ALIAS_CRYPTO("cast6"); 125