1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Glue Code for SSE2 assembler versions of Serpent Cipher 4 * 5 * Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi> 6 * 7 * Glue code based on aesni-intel_glue.c by: 8 * Copyright (C) 2008, Intel Corp. 9 * Author: Huang Ying <ying.huang@intel.com> 10 * 11 * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by: 12 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> 13 * CTR part based on code (crypto/ctr.c) by: 14 * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com> 15 */ 16 17 #include <linux/module.h> 18 #include <linux/types.h> 19 #include <linux/crypto.h> 20 #include <linux/err.h> 21 #include <crypto/algapi.h> 22 #include <crypto/b128ops.h> 23 #include <crypto/internal/simd.h> 24 #include <crypto/serpent.h> 25 #include <asm/crypto/serpent-sse2.h> 26 #include <asm/crypto/glue_helper.h> 27 28 static int serpent_setkey_skcipher(struct crypto_skcipher *tfm, 29 const u8 *key, unsigned int keylen) 30 { 31 return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen); 32 } 33 34 static void serpent_decrypt_cbc_xway(void *ctx, u128 *dst, const u128 *src) 35 { 36 u128 ivs[SERPENT_PARALLEL_BLOCKS - 1]; 37 unsigned int j; 38 39 for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++) 40 ivs[j] = src[j]; 41 42 serpent_dec_blk_xway(ctx, (u8 *)dst, (u8 *)src); 43 44 for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++) 45 u128_xor(dst + (j + 1), dst + (j + 1), ivs + j); 46 } 47 48 static void serpent_crypt_ctr(void *ctx, u128 *dst, const u128 *src, le128 *iv) 49 { 50 be128 ctrblk; 51 52 le128_to_be128(&ctrblk, iv); 53 le128_inc(iv); 54 55 __serpent_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk); 56 u128_xor(dst, src, (u128 *)&ctrblk); 57 } 58 59 static void serpent_crypt_ctr_xway(void *ctx, u128 *dst, const u128 *src, 60 le128 *iv) 61 { 62 be128 ctrblks[SERPENT_PARALLEL_BLOCKS]; 63 unsigned int i; 64 65 for (i = 0; i < SERPENT_PARALLEL_BLOCKS; i++) { 66 if (dst != src) 67 dst[i] = src[i]; 68 69 le128_to_be128(&ctrblks[i], iv); 70 le128_inc(iv); 71 } 72 73 serpent_enc_blk_xway_xor(ctx, (u8 *)dst, (u8 *)ctrblks); 74 } 75 76 static const struct common_glue_ctx serpent_enc = { 77 .num_funcs = 2, 78 .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS, 79 80 .funcs = { { 81 .num_blocks = SERPENT_PARALLEL_BLOCKS, 82 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_enc_blk_xway) } 83 }, { 84 .num_blocks = 1, 85 .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_encrypt) } 86 } } 87 }; 88 89 static const struct common_glue_ctx serpent_ctr = { 90 .num_funcs = 2, 91 .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS, 92 93 .funcs = { { 94 .num_blocks = SERPENT_PARALLEL_BLOCKS, 95 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr_xway) } 96 }, { 97 .num_blocks = 1, 98 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr) } 99 } } 100 }; 101 102 static const struct common_glue_ctx serpent_dec = { 103 .num_funcs = 2, 104 .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS, 105 106 .funcs = { { 107 .num_blocks = SERPENT_PARALLEL_BLOCKS, 108 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_dec_blk_xway) } 109 }, { 110 .num_blocks = 1, 111 .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_decrypt) } 112 } } 113 }; 114 115 static const struct common_glue_ctx serpent_dec_cbc = { 116 .num_funcs = 2, 117 .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS, 118 119 .funcs = { { 120 .num_blocks = SERPENT_PARALLEL_BLOCKS, 121 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_decrypt_cbc_xway) } 122 }, { 123 .num_blocks = 1, 124 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__serpent_decrypt) } 125 } } 126 }; 127 128 static int ecb_encrypt(struct skcipher_request *req) 129 { 130 return glue_ecb_req_128bit(&serpent_enc, req); 131 } 132 133 static int ecb_decrypt(struct skcipher_request *req) 134 { 135 return glue_ecb_req_128bit(&serpent_dec, req); 136 } 137 138 static int cbc_encrypt(struct skcipher_request *req) 139 { 140 return glue_cbc_encrypt_req_128bit(GLUE_FUNC_CAST(__serpent_encrypt), 141 req); 142 } 143 144 static int cbc_decrypt(struct skcipher_request *req) 145 { 146 return glue_cbc_decrypt_req_128bit(&serpent_dec_cbc, req); 147 } 148 149 static int ctr_crypt(struct skcipher_request *req) 150 { 151 return glue_ctr_req_128bit(&serpent_ctr, req); 152 } 153 154 static struct skcipher_alg serpent_algs[] = { 155 { 156 .base.cra_name = "__ecb(serpent)", 157 .base.cra_driver_name = "__ecb-serpent-sse2", 158 .base.cra_priority = 400, 159 .base.cra_flags = CRYPTO_ALG_INTERNAL, 160 .base.cra_blocksize = SERPENT_BLOCK_SIZE, 161 .base.cra_ctxsize = sizeof(struct serpent_ctx), 162 .base.cra_module = THIS_MODULE, 163 .min_keysize = SERPENT_MIN_KEY_SIZE, 164 .max_keysize = SERPENT_MAX_KEY_SIZE, 165 .setkey = serpent_setkey_skcipher, 166 .encrypt = ecb_encrypt, 167 .decrypt = ecb_decrypt, 168 }, { 169 .base.cra_name = "__cbc(serpent)", 170 .base.cra_driver_name = "__cbc-serpent-sse2", 171 .base.cra_priority = 400, 172 .base.cra_flags = CRYPTO_ALG_INTERNAL, 173 .base.cra_blocksize = SERPENT_BLOCK_SIZE, 174 .base.cra_ctxsize = sizeof(struct serpent_ctx), 175 .base.cra_module = THIS_MODULE, 176 .min_keysize = SERPENT_MIN_KEY_SIZE, 177 .max_keysize = SERPENT_MAX_KEY_SIZE, 178 .ivsize = SERPENT_BLOCK_SIZE, 179 .setkey = serpent_setkey_skcipher, 180 .encrypt = cbc_encrypt, 181 .decrypt = cbc_decrypt, 182 }, { 183 .base.cra_name = "__ctr(serpent)", 184 .base.cra_driver_name = "__ctr-serpent-sse2", 185 .base.cra_priority = 400, 186 .base.cra_flags = CRYPTO_ALG_INTERNAL, 187 .base.cra_blocksize = 1, 188 .base.cra_ctxsize = sizeof(struct serpent_ctx), 189 .base.cra_module = THIS_MODULE, 190 .min_keysize = SERPENT_MIN_KEY_SIZE, 191 .max_keysize = SERPENT_MAX_KEY_SIZE, 192 .ivsize = SERPENT_BLOCK_SIZE, 193 .chunksize = SERPENT_BLOCK_SIZE, 194 .setkey = serpent_setkey_skcipher, 195 .encrypt = ctr_crypt, 196 .decrypt = ctr_crypt, 197 }, 198 }; 199 200 static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)]; 201 202 static int __init serpent_sse2_init(void) 203 { 204 if (!boot_cpu_has(X86_FEATURE_XMM2)) { 205 printk(KERN_INFO "SSE2 instructions are not detected.\n"); 206 return -ENODEV; 207 } 208 209 return simd_register_skciphers_compat(serpent_algs, 210 ARRAY_SIZE(serpent_algs), 211 serpent_simd_algs); 212 } 213 214 static void __exit serpent_sse2_exit(void) 215 { 216 simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs), 217 serpent_simd_algs); 218 } 219 220 module_init(serpent_sse2_init); 221 module_exit(serpent_sse2_exit); 222 223 MODULE_DESCRIPTION("Serpent Cipher Algorithm, SSE2 optimized"); 224 MODULE_LICENSE("GPL"); 225 MODULE_ALIAS_CRYPTO("serpent"); 226