1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Glue Code for the AVX assembler implementation of the Cast5 Cipher 4 * 5 * Copyright (C) 2012 Johannes Goetzfried 6 * <Johannes.Goetzfried@informatik.stud.uni-erlangen.de> 7 */ 8 9 #include <crypto/algapi.h> 10 #include <crypto/cast5.h> 11 #include <linux/crypto.h> 12 #include <linux/err.h> 13 #include <linux/module.h> 14 #include <linux/types.h> 15 16 #include "ecb_cbc_helpers.h" 17 18 #define CAST5_PARALLEL_BLOCKS 16 19 20 asmlinkage void cast5_ecb_enc_16way(struct cast5_ctx *ctx, u8 *dst, 21 const u8 *src); 22 asmlinkage void cast5_ecb_dec_16way(struct cast5_ctx *ctx, u8 *dst, 23 const u8 *src); 24 asmlinkage void cast5_cbc_dec_16way(struct cast5_ctx *ctx, u8 *dst, 25 const u8 *src); 26 27 static int cast5_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key, 28 unsigned int keylen) 29 { 30 return cast5_setkey(&tfm->base, key, keylen); 31 } 32 33 static int ecb_encrypt(struct skcipher_request *req) 34 { 35 ECB_WALK_START(req, CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS); 36 ECB_BLOCK(CAST5_PARALLEL_BLOCKS, cast5_ecb_enc_16way); 37 ECB_BLOCK(1, __cast5_encrypt); 38 ECB_WALK_END(); 39 } 40 41 static int ecb_decrypt(struct skcipher_request *req) 42 { 43 ECB_WALK_START(req, CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS); 44 ECB_BLOCK(CAST5_PARALLEL_BLOCKS, cast5_ecb_dec_16way); 45 ECB_BLOCK(1, __cast5_decrypt); 46 ECB_WALK_END(); 47 } 48 49 static int cbc_encrypt(struct skcipher_request *req) 50 { 51 CBC_WALK_START(req, CAST5_BLOCK_SIZE, -1); 52 CBC_ENC_BLOCK(__cast5_encrypt); 53 CBC_WALK_END(); 54 } 55 56 static int cbc_decrypt(struct skcipher_request *req) 57 { 58 CBC_WALK_START(req, CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS); 59 CBC_DEC_BLOCK(CAST5_PARALLEL_BLOCKS, cast5_cbc_dec_16way); 60 CBC_DEC_BLOCK(1, __cast5_decrypt); 61 CBC_WALK_END(); 62 } 63 64 static struct skcipher_alg cast5_algs[] = { 65 { 66 .base.cra_name = "ecb(cast5)", 67 .base.cra_driver_name = "ecb-cast5-avx", 68 .base.cra_priority = 200, 69 .base.cra_blocksize = CAST5_BLOCK_SIZE, 70 .base.cra_ctxsize = sizeof(struct cast5_ctx), 71 .base.cra_module = THIS_MODULE, 72 .min_keysize = CAST5_MIN_KEY_SIZE, 73 .max_keysize = CAST5_MAX_KEY_SIZE, 74 .setkey = cast5_setkey_skcipher, 75 .encrypt = ecb_encrypt, 76 .decrypt = ecb_decrypt, 77 }, { 78 .base.cra_name = "cbc(cast5)", 79 .base.cra_driver_name = "cbc-cast5-avx", 80 .base.cra_priority = 200, 81 .base.cra_blocksize = CAST5_BLOCK_SIZE, 82 .base.cra_ctxsize = sizeof(struct cast5_ctx), 83 .base.cra_module = THIS_MODULE, 84 .min_keysize = CAST5_MIN_KEY_SIZE, 85 .max_keysize = CAST5_MAX_KEY_SIZE, 86 .ivsize = CAST5_BLOCK_SIZE, 87 .setkey = cast5_setkey_skcipher, 88 .encrypt = cbc_encrypt, 89 .decrypt = cbc_decrypt, 90 } 91 }; 92 93 static int __init cast5_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(cast5_algs, 104 ARRAY_SIZE(cast5_algs)); 105 } 106 107 static void __exit cast5_exit(void) 108 { 109 crypto_unregister_skciphers(cast5_algs, ARRAY_SIZE(cast5_algs)); 110 } 111 112 module_init(cast5_init); 113 module_exit(cast5_exit); 114 115 MODULE_DESCRIPTION("Cast5 Cipher Algorithm, AVX optimized"); 116 MODULE_LICENSE("GPL"); 117 MODULE_ALIAS_CRYPTO("cast5"); 118