// SPDX-License-Identifier: GPL-2.0-or-later /* * Glue Code for assembler optimized version of Blowfish * * Copyright (c) 2011 Jussi Kivilinna * * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by: * Copyright (c) 2006 Herbert Xu */ #include #include #include #include #include #include #include /* regular block cipher functions */ asmlinkage void __blowfish_enc_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src, bool xor); asmlinkage void blowfish_dec_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src); /* 4-way parallel cipher functions */ asmlinkage void __blowfish_enc_blk_4way(struct bf_ctx *ctx, u8 *dst, const u8 *src, bool xor); asmlinkage void blowfish_dec_blk_4way(struct bf_ctx *ctx, u8 *dst, const u8 *src); static inline void blowfish_enc_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src) { __blowfish_enc_blk(ctx, dst, src, false); } static inline void blowfish_enc_blk_4way(struct bf_ctx *ctx, u8 *dst, const u8 *src) { __blowfish_enc_blk_4way(ctx, dst, src, false); } static void blowfish_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) { blowfish_enc_blk(crypto_tfm_ctx(tfm), dst, src); } static void blowfish_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) { blowfish_dec_blk(crypto_tfm_ctx(tfm), dst, src); } static int blowfish_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key, unsigned int keylen) { return blowfish_setkey(&tfm->base, key, keylen); } static int ecb_crypt(struct skcipher_request *req, void (*fn)(struct bf_ctx *, u8 *, const u8 *), void (*fn_4way)(struct bf_ctx *, u8 *, const u8 *)) { unsigned int bsize = BF_BLOCK_SIZE; struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); struct bf_ctx *ctx = crypto_skcipher_ctx(tfm); struct skcipher_walk walk; unsigned int nbytes; int err; err = skcipher_walk_virt(&walk, req, false); while ((nbytes = walk.nbytes)) { u8 *wsrc = walk.src.virt.addr; u8 *wdst = walk.dst.virt.addr; /* Process four block batch */ if (nbytes >= bsize * 4) { do { fn_4way(ctx, wdst, wsrc); wsrc += bsize * 4; wdst += bsize * 4; nbytes -= bsize * 4; } while (nbytes >= bsize * 4); if (nbytes < bsize) goto done; } /* Handle leftovers */ do { fn(ctx, wdst, wsrc); wsrc += bsize; wdst += bsize; nbytes -= bsize; } while (nbytes >= bsize); done: err = skcipher_walk_done(&walk, nbytes); } return err; } static int ecb_encrypt(struct skcipher_request *req) { return ecb_crypt(req, blowfish_enc_blk, blowfish_enc_blk_4way); } static int ecb_decrypt(struct skcipher_request *req) { return ecb_crypt(req, blowfish_dec_blk, blowfish_dec_blk_4way); } static unsigned int __cbc_encrypt(struct bf_ctx *ctx, struct skcipher_walk *walk) { unsigned int bsize = BF_BLOCK_SIZE; unsigned int nbytes = walk->nbytes; u64 *src = (u64 *)walk->src.virt.addr; u64 *dst = (u64 *)walk->dst.virt.addr; u64 *iv = (u64 *)walk->iv; do { *dst = *src ^ *iv; blowfish_enc_blk(ctx, (u8 *)dst, (u8 *)dst); iv = dst; src += 1; dst += 1; nbytes -= bsize; } while (nbytes >= bsize); *(u64 *)walk->iv = *iv; return nbytes; } static int cbc_encrypt(struct skcipher_request *req) { struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); struct bf_ctx *ctx = crypto_skcipher_ctx(tfm); struct skcipher_walk walk; unsigned int nbytes; int err; err = skcipher_walk_virt(&walk, req, false); while ((nbytes = walk.nbytes)) { nbytes = __cbc_encrypt(ctx, &walk); err = skcipher_walk_done(&walk, nbytes); } return err; } static unsigned int __cbc_decrypt(struct bf_ctx *ctx, struct skcipher_walk *walk) { unsigned int bsize = BF_BLOCK_SIZE; unsigned int nbytes = walk->nbytes; u64 *src = (u64 *)walk->src.virt.addr; u64 *dst = (u64 *)walk->dst.virt.addr; u64 ivs[4 - 1]; u64 last_iv; /* Start of the last block. */ src += nbytes / bsize - 1; dst += nbytes / bsize - 1; last_iv = *src; /* Process four block batch */ if (nbytes >= bsize * 4) { do { nbytes -= bsize * 4 - bsize; src -= 4 - 1; dst -= 4 - 1; ivs[0] = src[0]; ivs[1] = src[1]; ivs[2] = src[2]; blowfish_dec_blk_4way(ctx, (u8 *)dst, (u8 *)src); dst[1] ^= ivs[0]; dst[2] ^= ivs[1]; dst[3] ^= ivs[2]; nbytes -= bsize; if (nbytes < bsize) goto done; *dst ^= *(src - 1); src -= 1; dst -= 1; } while (nbytes >= bsize * 4); } /* Handle leftovers */ for (;;) { blowfish_dec_blk(ctx, (u8 *)dst, (u8 *)src); nbytes -= bsize; if (nbytes < bsize) break; *dst ^= *(src - 1); src -= 1; dst -= 1; } done: *dst ^= *(u64 *)walk->iv; *(u64 *)walk->iv = last_iv; return nbytes; } static int cbc_decrypt(struct skcipher_request *req) { struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); struct bf_ctx *ctx = crypto_skcipher_ctx(tfm); struct skcipher_walk walk; unsigned int nbytes; int err; err = skcipher_walk_virt(&walk, req, false); while ((nbytes = walk.nbytes)) { nbytes = __cbc_decrypt(ctx, &walk); err = skcipher_walk_done(&walk, nbytes); } return err; } static struct crypto_alg bf_cipher_alg = { .cra_name = "blowfish", .cra_driver_name = "blowfish-asm", .cra_priority = 200, .cra_flags = CRYPTO_ALG_TYPE_CIPHER, .cra_blocksize = BF_BLOCK_SIZE, .cra_ctxsize = sizeof(struct bf_ctx), .cra_alignmask = 0, .cra_module = THIS_MODULE, .cra_u = { .cipher = { .cia_min_keysize = BF_MIN_KEY_SIZE, .cia_max_keysize = BF_MAX_KEY_SIZE, .cia_setkey = blowfish_setkey, .cia_encrypt = blowfish_encrypt, .cia_decrypt = blowfish_decrypt, } } }; static struct skcipher_alg bf_skcipher_algs[] = { { .base.cra_name = "ecb(blowfish)", .base.cra_driver_name = "ecb-blowfish-asm", .base.cra_priority = 300, .base.cra_blocksize = BF_BLOCK_SIZE, .base.cra_ctxsize = sizeof(struct bf_ctx), .base.cra_module = THIS_MODULE, .min_keysize = BF_MIN_KEY_SIZE, .max_keysize = BF_MAX_KEY_SIZE, .setkey = blowfish_setkey_skcipher, .encrypt = ecb_encrypt, .decrypt = ecb_decrypt, }, { .base.cra_name = "cbc(blowfish)", .base.cra_driver_name = "cbc-blowfish-asm", .base.cra_priority = 300, .base.cra_blocksize = BF_BLOCK_SIZE, .base.cra_ctxsize = sizeof(struct bf_ctx), .base.cra_module = THIS_MODULE, .min_keysize = BF_MIN_KEY_SIZE, .max_keysize = BF_MAX_KEY_SIZE, .ivsize = BF_BLOCK_SIZE, .setkey = blowfish_setkey_skcipher, .encrypt = cbc_encrypt, .decrypt = cbc_decrypt, }, }; static bool is_blacklisted_cpu(void) { if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL) return false; if (boot_cpu_data.x86 == 0x0f) { /* * On Pentium 4, blowfish-x86_64 is slower than generic C * implementation because use of 64bit rotates (which are really * slow on P4). Therefore blacklist P4s. */ return true; } return false; } static int force; module_param(force, int, 0); MODULE_PARM_DESC(force, "Force module load, ignore CPU blacklist"); static int __init init(void) { int err; if (!force && is_blacklisted_cpu()) { printk(KERN_INFO "blowfish-x86_64: performance on this CPU " "would be suboptimal: disabling " "blowfish-x86_64.\n"); return -ENODEV; } err = crypto_register_alg(&bf_cipher_alg); if (err) return err; err = crypto_register_skciphers(bf_skcipher_algs, ARRAY_SIZE(bf_skcipher_algs)); if (err) crypto_unregister_alg(&bf_cipher_alg); return err; } static void __exit fini(void) { crypto_unregister_alg(&bf_cipher_alg); crypto_unregister_skciphers(bf_skcipher_algs, ARRAY_SIZE(bf_skcipher_algs)); } module_init(init); module_exit(fini); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Blowfish Cipher Algorithm, asm optimized"); MODULE_ALIAS_CRYPTO("blowfish"); MODULE_ALIAS_CRYPTO("blowfish-asm");