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 18 #include "ecb_cbc_helpers.h" 19 20 #define CAST6_PARALLEL_BLOCKS 8 21 22 asmlinkage void cast6_ecb_enc_8way(const void *ctx, u8 *dst, const u8 *src); 23 asmlinkage void cast6_ecb_dec_8way(const void *ctx, u8 *dst, const u8 *src); 24 25 asmlinkage void cast6_cbc_dec_8way(const void *ctx, u8 *dst, const u8 *src); 26 27 static int cast6_setkey_skcipher(struct crypto_skcipher *tfm, 28 const u8 *key, unsigned int keylen) 29 { 30 return cast6_setkey(&tfm->base, key, keylen); 31 } 32 33 static int ecb_encrypt(struct skcipher_request *req) 34 { 35 ECB_WALK_START(req, CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS); 36 ECB_BLOCK(CAST6_PARALLEL_BLOCKS, cast6_ecb_enc_8way); 37 ECB_BLOCK(1, __cast6_encrypt); 38 ECB_WALK_END(); 39 } 40 41 static int ecb_decrypt(struct skcipher_request *req) 42 { 43 ECB_WALK_START(req, CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS); 44 ECB_BLOCK(CAST6_PARALLEL_BLOCKS, cast6_ecb_dec_8way); 45 ECB_BLOCK(1, __cast6_decrypt); 46 ECB_WALK_END(); 47 } 48 49 static int cbc_encrypt(struct skcipher_request *req) 50 { 51 CBC_WALK_START(req, CAST6_BLOCK_SIZE, -1); 52 CBC_ENC_BLOCK(__cast6_encrypt); 53 CBC_WALK_END(); 54 } 55 56 static int cbc_decrypt(struct skcipher_request *req) 57 { 58 CBC_WALK_START(req, CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS); 59 CBC_DEC_BLOCK(CAST6_PARALLEL_BLOCKS, cast6_cbc_dec_8way); 60 CBC_DEC_BLOCK(1, __cast6_decrypt); 61 CBC_WALK_END(); 62 } 63 64 static struct skcipher_alg cast6_algs[] = { 65 { 66 .base.cra_name = "ecb(cast6)", 67 .base.cra_driver_name = "ecb-cast6-avx", 68 .base.cra_priority = 200, 69 .base.cra_blocksize = CAST6_BLOCK_SIZE, 70 .base.cra_ctxsize = sizeof(struct cast6_ctx), 71 .base.cra_module = THIS_MODULE, 72 .min_keysize = CAST6_MIN_KEY_SIZE, 73 .max_keysize = CAST6_MAX_KEY_SIZE, 74 .setkey = cast6_setkey_skcipher, 75 .encrypt = ecb_encrypt, 76 .decrypt = ecb_decrypt, 77 }, { 78 .base.cra_name = "cbc(cast6)", 79 .base.cra_driver_name = "cbc-cast6-avx", 80 .base.cra_priority = 200, 81 .base.cra_blocksize = CAST6_BLOCK_SIZE, 82 .base.cra_ctxsize = sizeof(struct cast6_ctx), 83 .base.cra_module = THIS_MODULE, 84 .min_keysize = CAST6_MIN_KEY_SIZE, 85 .max_keysize = CAST6_MAX_KEY_SIZE, 86 .ivsize = CAST6_BLOCK_SIZE, 87 .setkey = cast6_setkey_skcipher, 88 .encrypt = cbc_encrypt, 89 .decrypt = cbc_decrypt, 90 }, 91 }; 92 93 static int __init cast6_init(void) 94 { 95 const char *feature_name; 96 97 if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, 98 &feature_name)) { 99 pr_info("CPU feature '%s' is not supported.\n", feature_name); 100 return -ENODEV; 101 } 102 103 return crypto_register_skciphers(cast6_algs, ARRAY_SIZE(cast6_algs)); 104 } 105 106 static void __exit cast6_exit(void) 107 { 108 crypto_unregister_skciphers(cast6_algs, ARRAY_SIZE(cast6_algs)); 109 } 110 111 module_init(cast6_init); 112 module_exit(cast6_exit); 113 114 MODULE_DESCRIPTION("Cast6 Cipher Algorithm, AVX optimized"); 115 MODULE_LICENSE("GPL"); 116 MODULE_ALIAS_CRYPTO("cast6"); 117