1 files changed, 509 insertions, 0 deletions

diff --git a/arch/x86/crypto/des3_ede_glue.c b/arch/x86/crypto/des3_ede_glue.c
new file mode 100644
index 000000000000..0e9c0668fe4e
--- /dev/null
+++ b/arch/x86/crypto/des3_ede_glue.c
@@ -0,0 +1,509 @@
+/*
+ * Glue Code for assembler optimized version of 3DES
+ *
+ * Copyright © 2014 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>
+ * CTR part based on code (crypto/ctr.c) by:
+ *   (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <asm/processor.h>
+#include <crypto/des.h>
+#include <linux/crypto.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <crypto/algapi.h>
+
+struct des3_ede_x86_ctx {
+	u32 enc_expkey[DES3_EDE_EXPKEY_WORDS];
+	u32 dec_expkey[DES3_EDE_EXPKEY_WORDS];
+};
+
+/* regular block cipher functions */
+asmlinkage void des3_ede_x86_64_crypt_blk(const u32 *expkey, u8 *dst,
+					  const u8 *src);
+
+/* 3-way parallel cipher functions */
+asmlinkage void des3_ede_x86_64_crypt_blk_3way(const u32 *expkey, u8 *dst,
+					       const u8 *src);
+
+static inline void des3_ede_enc_blk(struct des3_ede_x86_ctx *ctx, u8 *dst,
+				    const u8 *src)
+{
+	u32 *enc_ctx = ctx->enc_expkey;
+
+	des3_ede_x86_64_crypt_blk(enc_ctx, dst, src);
+}
+
+static inline void des3_ede_dec_blk(struct des3_ede_x86_ctx *ctx, u8 *dst,
+				    const u8 *src)
+{
+	u32 *dec_ctx = ctx->dec_expkey;
+
+	des3_ede_x86_64_crypt_blk(dec_ctx, dst, src);
+}
+
+static inline void des3_ede_enc_blk_3way(struct des3_ede_x86_ctx *ctx, u8 *dst,
+					 const u8 *src)
+{
+	u32 *enc_ctx = ctx->enc_expkey;
+
+	des3_ede_x86_64_crypt_blk_3way(enc_ctx, dst, src);
+}
+
+static inline void des3_ede_dec_blk_3way(struct des3_ede_x86_ctx *ctx, u8 *dst,
+					 const u8 *src)
+{
+	u32 *dec_ctx = ctx->dec_expkey;
+
+	des3_ede_x86_64_crypt_blk_3way(dec_ctx, dst, src);
+}
+
+static void des3_ede_x86_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+	des3_ede_enc_blk(crypto_tfm_ctx(tfm), dst, src);
+}
+
+static void des3_ede_x86_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+	des3_ede_dec_blk(crypto_tfm_ctx(tfm), dst, src);
+}
+
+static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk,
+		     const u32 *expkey)
+{
+	unsigned int bsize = DES3_EDE_BLOCK_SIZE;
+	unsigned int nbytes;
+	int err;
+
+	err = blkcipher_walk_virt(desc, walk);
+
+	while ((nbytes = walk->nbytes)) {
+		u8 *wsrc = walk->src.virt.addr;
+		u8 *wdst = walk->dst.virt.addr;
+
+		/* Process four block batch */
+		if (nbytes >= bsize * 3) {
+			do {
+				des3_ede_x86_64_crypt_blk_3way(expkey, wdst,
+							       wsrc);
+
+				wsrc += bsize * 3;
+				wdst += bsize * 3;
+				nbytes -= bsize * 3;
+			} while (nbytes >= bsize * 3);
+
+			if (nbytes < bsize)
+				goto done;
+		}
+
+		/* Handle leftovers */
+		do {
+			des3_ede_x86_64_crypt_blk(expkey, wdst, wsrc);
+
+			wsrc += bsize;
+			wdst += bsize;
+			nbytes -= bsize;
+		} while (nbytes >= bsize);
+
+done:
+		err = blkcipher_walk_done(desc, walk, nbytes);
+	}
+
+	return err;
+}
+
+static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+		       struct scatterlist *src, unsigned int nbytes)
+{
+	struct des3_ede_x86_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+	struct blkcipher_walk walk;
+
+	blkcipher_walk_init(&walk, dst, src, nbytes);
+	return ecb_crypt(desc, &walk, ctx->enc_expkey);
+}
+
+static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+		       struct scatterlist *src, unsigned int nbytes)
+{
+	struct des3_ede_x86_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+	struct blkcipher_walk walk;
+
+	blkcipher_walk_init(&walk, dst, src, nbytes);
+	return ecb_crypt(desc, &walk, ctx->dec_expkey);
+}
+
+static unsigned int __cbc_encrypt(struct blkcipher_desc *desc,
+				  struct blkcipher_walk *walk)
+{
+	struct des3_ede_x86_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+	unsigned int bsize = DES3_EDE_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;
+		des3_ede_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 blkcipher_desc *desc, struct scatterlist *dst,
+		       struct scatterlist *src, unsigned int nbytes)
+{
+	struct blkcipher_walk walk;
+	int err;
+
+	blkcipher_walk_init(&walk, dst, src, nbytes);
+	err = blkcipher_walk_virt(desc, &walk);
+
+	while ((nbytes = walk.nbytes)) {
+		nbytes = __cbc_encrypt(desc, &walk);
+		err = blkcipher_walk_done(desc, &walk, nbytes);
+	}
+
+	return err;
+}
+
+static unsigned int __cbc_decrypt(struct blkcipher_desc *desc,
+				  struct blkcipher_walk *walk)
+{
+	struct des3_ede_x86_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+	unsigned int bsize = DES3_EDE_BLOCK_SIZE;
+	unsigned int nbytes = walk->nbytes;
+	u64 *src = (u64 *)walk->src.virt.addr;
+	u64 *dst = (u64 *)walk->dst.virt.addr;
+	u64 ivs[3 - 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 * 3) {
+		do {
+			nbytes -= bsize * 3 - bsize;
+			src -= 3 - 1;
+			dst -= 3 - 1;
+
+			ivs[0] = src[0];
+			ivs[1] = src[1];
+
+			des3_ede_dec_blk_3way(ctx, (u8 *)dst, (u8 *)src);
+
+			dst[1] ^= ivs[0];
+			dst[2] ^= ivs[1];
+
+			nbytes -= bsize;
+			if (nbytes < bsize)
+				goto done;
+
+			*dst ^= *(src - 1);
+			src -= 1;
+			dst -= 1;
+		} while (nbytes >= bsize * 3);
+	}
+
+	/* Handle leftovers */
+	for (;;) {
+		des3_ede_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 blkcipher_desc *desc, struct scatterlist *dst,
+		       struct scatterlist *src, unsigned int nbytes)
+{
+	struct blkcipher_walk walk;
+	int err;
+
+	blkcipher_walk_init(&walk, dst, src, nbytes);
+	err = blkcipher_walk_virt(desc, &walk);
+
+	while ((nbytes = walk.nbytes)) {
+		nbytes = __cbc_decrypt(desc, &walk);
+		err = blkcipher_walk_done(desc, &walk, nbytes);
+	}
+
+	return err;
+}
+
+static void ctr_crypt_final(struct des3_ede_x86_ctx *ctx,
+			    struct blkcipher_walk *walk)
+{
+	u8 *ctrblk = walk->iv;
+	u8 keystream[DES3_EDE_BLOCK_SIZE];
+	u8 *src = walk->src.virt.addr;
+	u8 *dst = walk->dst.virt.addr;
+	unsigned int nbytes = walk->nbytes;
+
+	des3_ede_enc_blk(ctx, keystream, ctrblk);
+	crypto_xor(keystream, src, nbytes);
+	memcpy(dst, keystream, nbytes);
+
+	crypto_inc(ctrblk, DES3_EDE_BLOCK_SIZE);
+}
+
+static unsigned int __ctr_crypt(struct blkcipher_desc *desc,
+				struct blkcipher_walk *walk)
+{
+	struct des3_ede_x86_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+	unsigned int bsize = DES3_EDE_BLOCK_SIZE;
+	unsigned int nbytes = walk->nbytes;
+	__be64 *src = (__be64 *)walk->src.virt.addr;
+	__be64 *dst = (__be64 *)walk->dst.virt.addr;
+	u64 ctrblk = be64_to_cpu(*(__be64 *)walk->iv);
+	__be64 ctrblocks[3];
+
+	/* Process four block batch */
+	if (nbytes >= bsize * 3) {
+		do {
+			/* create ctrblks for parallel encrypt */
+			ctrblocks[0] = cpu_to_be64(ctrblk++);
+			ctrblocks[1] = cpu_to_be64(ctrblk++);
+			ctrblocks[2] = cpu_to_be64(ctrblk++);
+
+			des3_ede_enc_blk_3way(ctx, (u8 *)ctrblocks,
+					      (u8 *)ctrblocks);
+
+			dst[0] = src[0] ^ ctrblocks[0];
+			dst[1] = src[1] ^ ctrblocks[1];
+			dst[2] = src[2] ^ ctrblocks[2];
+
+			src += 3;
+			dst += 3;
+		} while ((nbytes -= bsize * 3) >= bsize * 3);
+
+		if (nbytes < bsize)
+			goto done;
+	}
+
+	/* Handle leftovers */
+	do {
+		ctrblocks[0] = cpu_to_be64(ctrblk++);
+
+		des3_ede_enc_blk(ctx, (u8 *)ctrblocks, (u8 *)ctrblocks);
+
+		dst[0] = src[0] ^ ctrblocks[0];
+
+		src += 1;
+		dst += 1;
+	} while ((nbytes -= bsize) >= bsize);
+
+done:
+	*(__be64 *)walk->iv = cpu_to_be64(ctrblk);
+	return nbytes;
+}
+
+static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+		     struct scatterlist *src, unsigned int nbytes)
+{
+	struct blkcipher_walk walk;
+	int err;
+
+	blkcipher_walk_init(&walk, dst, src, nbytes);
+	err = blkcipher_walk_virt_block(desc, &walk, DES3_EDE_BLOCK_SIZE);
+
+	while ((nbytes = walk.nbytes) >= DES3_EDE_BLOCK_SIZE) {
+		nbytes = __ctr_crypt(desc, &walk);
+		err = blkcipher_walk_done(desc, &walk, nbytes);
+	}
+
+	if (walk.nbytes) {
+		ctr_crypt_final(crypto_blkcipher_ctx(desc->tfm), &walk);
+		err = blkcipher_walk_done(desc, &walk, 0);
+	}
+
+	return err;
+}
+
+static int des3_ede_x86_setkey(struct crypto_tfm *tfm, const u8 *key,
+			       unsigned int keylen)
+{
+	struct des3_ede_x86_ctx *ctx = crypto_tfm_ctx(tfm);
+	u32 i, j, tmp;
+	int err;
+
+	/* Generate encryption context using generic implementation. */
+	err = __des3_ede_setkey(ctx->enc_expkey, &tfm->crt_flags, key, keylen);
+	if (err < 0)
+		return err;
+
+	/* Fix encryption context for this implementation and form decryption
+	 * context. */
+	j = DES3_EDE_EXPKEY_WORDS - 2;
+	for (i = 0; i < DES3_EDE_EXPKEY_WORDS; i += 2, j -= 2) {
+		tmp = ror32(ctx->enc_expkey[i + 1], 4);
+		ctx->enc_expkey[i + 1] = tmp;
+
+		ctx->dec_expkey[j + 0] = ctx->enc_expkey[i + 0];
+		ctx->dec_expkey[j + 1] = tmp;
+	}
+
+	return 0;
+}
+
+static struct crypto_alg des3_ede_algs[4] = { {
+	.cra_name		= "des3_ede",
+	.cra_driver_name	= "des3_ede-asm",
+	.cra_priority		= 200,
+	.cra_flags		= CRYPTO_ALG_TYPE_CIPHER,
+	.cra_blocksize		= DES3_EDE_BLOCK_SIZE,
+	.cra_ctxsize		= sizeof(struct des3_ede_x86_ctx),
+	.cra_alignmask		= 0,
+	.cra_module		= THIS_MODULE,
+	.cra_u = {
+		.cipher = {
+			.cia_min_keysize	= DES3_EDE_KEY_SIZE,
+			.cia_max_keysize	= DES3_EDE_KEY_SIZE,
+			.cia_setkey		= des3_ede_x86_setkey,
+			.cia_encrypt		= des3_ede_x86_encrypt,
+			.cia_decrypt		= des3_ede_x86_decrypt,
+		}
+	}
+}, {
+	.cra_name		= "ecb(des3_ede)",
+	.cra_driver_name	= "ecb-des3_ede-asm",
+	.cra_priority		= 300,
+	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER,
+	.cra_blocksize		= DES3_EDE_BLOCK_SIZE,
+	.cra_ctxsize		= sizeof(struct des3_ede_x86_ctx),
+	.cra_alignmask		= 0,
+	.cra_type		= &crypto_blkcipher_type,
+	.cra_module		= THIS_MODULE,
+	.cra_u = {
+		.blkcipher = {
+			.min_keysize	= DES3_EDE_KEY_SIZE,
+			.max_keysize	= DES3_EDE_KEY_SIZE,
+			.setkey		= des3_ede_x86_setkey,
+			.encrypt	= ecb_encrypt,
+			.decrypt	= ecb_decrypt,
+		},
+	},
+}, {
+	.cra_name		= "cbc(des3_ede)",
+	.cra_driver_name	= "cbc-des3_ede-asm",
+	.cra_priority		= 300,
+	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER,
+	.cra_blocksize		= DES3_EDE_BLOCK_SIZE,
+	.cra_ctxsize		= sizeof(struct des3_ede_x86_ctx),
+	.cra_alignmask		= 0,
+	.cra_type		= &crypto_blkcipher_type,
+	.cra_module		= THIS_MODULE,
+	.cra_u = {
+		.blkcipher = {
+			.min_keysize	= DES3_EDE_KEY_SIZE,
+			.max_keysize	= DES3_EDE_KEY_SIZE,
+			.ivsize		= DES3_EDE_BLOCK_SIZE,
+			.setkey		= des3_ede_x86_setkey,
+			.encrypt	= cbc_encrypt,
+			.decrypt	= cbc_decrypt,
+		},
+	},
+}, {
+	.cra_name		= "ctr(des3_ede)",
+	.cra_driver_name	= "ctr-des3_ede-asm",
+	.cra_priority		= 300,
+	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER,
+	.cra_blocksize		= 1,
+	.cra_ctxsize		= sizeof(struct des3_ede_x86_ctx),
+	.cra_alignmask		= 0,
+	.cra_type		= &crypto_blkcipher_type,
+	.cra_module		= THIS_MODULE,
+	.cra_u = {
+		.blkcipher = {
+			.min_keysize	= DES3_EDE_KEY_SIZE,
+			.max_keysize	= DES3_EDE_KEY_SIZE,
+			.ivsize		= DES3_EDE_BLOCK_SIZE,
+			.setkey		= des3_ede_x86_setkey,
+			.encrypt	= ctr_crypt,
+			.decrypt	= ctr_crypt,
+		},
+	},
+} };
+
+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, des3_ede-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 des3_ede_x86_init(void)
+{
+	if (!force && is_blacklisted_cpu()) {
+		pr_info("des3_ede-x86_64: performance on this CPU would be suboptimal: disabling des3_ede-x86_64.\n");
+		return -ENODEV;
+	}
+
+	return crypto_register_algs(des3_ede_algs, ARRAY_SIZE(des3_ede_algs));
+}
+
+static void __exit des3_ede_x86_fini(void)
+{
+	crypto_unregister_algs(des3_ede_algs, ARRAY_SIZE(des3_ede_algs));
+}
+
+module_init(des3_ede_x86_init);
+module_exit(des3_ede_x86_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Triple DES EDE Cipher Algorithm, asm optimized");
+MODULE_ALIAS("des3_ede");
+MODULE_ALIAS("des3_ede-asm");
+MODULE_ALIAS("des");
+MODULE_ALIAS("des-asm");
+MODULE_AUTHOR("Jussi Kivilinna <jussi.kivilinna@iki.fi>");