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 <crypto/internal/simd.h> 12 #include <linux/crypto.h> 13 #include <linux/err.h> 14 #include <linux/module.h> 15 #include <linux/types.h> 16 17 #include "ecb_cbc_helpers.h" 18 19 #define CAST5_PARALLEL_BLOCKS 16 20 21 asmlinkage void cast5_ecb_enc_16way(struct cast5_ctx *ctx, u8 *dst, 22 const u8 *src); 23 asmlinkage void cast5_ecb_dec_16way(struct cast5_ctx *ctx, u8 *dst, 24 const u8 *src); 25 asmlinkage void cast5_cbc_dec_16way(struct cast5_ctx *ctx, u8 *dst, 26 const u8 *src); 27 28 static int cast5_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key, 29 unsigned int keylen) 30 { 31 return cast5_setkey(&tfm->base, key, keylen); 32 } 33 34 static int ecb_encrypt(struct skcipher_request *req) 35 { 36 ECB_WALK_START(req, CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS); 37 ECB_BLOCK(CAST5_PARALLEL_BLOCKS, cast5_ecb_enc_16way); 38 ECB_BLOCK(1, __cast5_encrypt); 39 ECB_WALK_END(); 40 } 41 42 static int ecb_decrypt(struct skcipher_request *req) 43 { 44 ECB_WALK_START(req, CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS); 45 ECB_BLOCK(CAST5_PARALLEL_BLOCKS, cast5_ecb_dec_16way); 46 ECB_BLOCK(1, __cast5_decrypt); 47 ECB_WALK_END(); 48 } 49 50 static int cbc_encrypt(struct skcipher_request *req) 51 { 52 CBC_WALK_START(req, CAST5_BLOCK_SIZE, -1); 53 CBC_ENC_BLOCK(__cast5_encrypt); 54 CBC_WALK_END(); 55 } 56 57 static int cbc_decrypt(struct skcipher_request *req) 58 { 59 CBC_WALK_START(req, CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS); 60 CBC_DEC_BLOCK(CAST5_PARALLEL_BLOCKS, cast5_cbc_dec_16way); 61 CBC_DEC_BLOCK(1, __cast5_decrypt); 62 CBC_WALK_END(); 63 } 64 65 static struct skcipher_alg cast5_algs[] = { 66 { 67 .base.cra_name = "__ecb(cast5)", 68 .base.cra_driver_name = "__ecb-cast5-avx", 69 .base.cra_priority = 200, 70 .base.cra_flags = CRYPTO_ALG_INTERNAL, 71 .base.cra_blocksize = CAST5_BLOCK_SIZE, 72 .base.cra_ctxsize = sizeof(struct cast5_ctx), 73 .base.cra_module = THIS_MODULE, 74 .min_keysize = CAST5_MIN_KEY_SIZE, 75 .max_keysize = CAST5_MAX_KEY_SIZE, 76 .setkey = cast5_setkey_skcipher, 77 .encrypt = ecb_encrypt, 78 .decrypt = ecb_decrypt, 79 }, { 80 .base.cra_name = "__cbc(cast5)", 81 .base.cra_driver_name = "__cbc-cast5-avx", 82 .base.cra_priority = 200, 83 .base.cra_flags = CRYPTO_ALG_INTERNAL, 84 .base.cra_blocksize = CAST5_BLOCK_SIZE, 85 .base.cra_ctxsize = sizeof(struct cast5_ctx), 86 .base.cra_module = THIS_MODULE, 87 .min_keysize = CAST5_MIN_KEY_SIZE, 88 .max_keysize = CAST5_MAX_KEY_SIZE, 89 .ivsize = CAST5_BLOCK_SIZE, 90 .setkey = cast5_setkey_skcipher, 91 .encrypt = cbc_encrypt, 92 .decrypt = cbc_decrypt, 93 } 94 }; 95 96 static struct simd_skcipher_alg *cast5_simd_algs[ARRAY_SIZE(cast5_algs)]; 97 98 static int __init cast5_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(cast5_algs, 109 ARRAY_SIZE(cast5_algs), 110 cast5_simd_algs); 111 } 112 113 static void __exit cast5_exit(void) 114 { 115 simd_unregister_skciphers(cast5_algs, ARRAY_SIZE(cast5_algs), 116 cast5_simd_algs); 117 } 118 119 module_init(cast5_init); 120 module_exit(cast5_exit); 121 122 MODULE_DESCRIPTION("Cast5 Cipher Algorithm, AVX optimized"); 123 MODULE_LICENSE("GPL"); 124 MODULE_ALIAS_CRYPTO("cast5"); 125