1 files changed, 343 insertions, 0 deletions
diff --git a/arch/x86/crypto/blowfish_glue.c b/arch/x86/crypto/blowfish_glue.c
new file mode 100644
index 000000000..019c64c13
--- /dev/null
+++ b/arch/x86/crypto/blowfish_glue.c
@@ -0,0 +1,343 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Glue Code for assembler optimized version of Blowfish
+ *
+ * Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
+ *
+ * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
+ *   Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
+ */
+
+#include <crypto/algapi.h>
+#include <crypto/blowfish.h>
+#include <crypto/internal/skcipher.h>
+#include <linux/crypto.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/types.h>
+
+/* 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 (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 (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 blowfish_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 blowfish_fini(void)
+{
+	crypto_unregister_alg(&bf_cipher_alg);
+	crypto_unregister_skciphers(bf_skcipher_algs,
+				    ARRAY_SIZE(bf_skcipher_algs));
+}
+
+module_init(blowfish_init);
+module_exit(blowfish_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Blowfish Cipher Algorithm, asm optimized");
+MODULE_ALIAS_CRYPTO("blowfish");
+MODULE_ALIAS_CRYPTO("blowfish-asm");