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-rw-r--r--arch/x86/crypto/glue_helper.c330
1 files changed, 330 insertions, 0 deletions
diff --git a/arch/x86/crypto/glue_helper.c b/arch/x86/crypto/glue_helper.c
new file mode 100644
index 000000000..a78ef99a9
--- /dev/null
+++ b/arch/x86/crypto/glue_helper.c
@@ -0,0 +1,330 @@
+/*
+ * Shared glue code for 128bit block ciphers
+ *
+ * Copyright © 2012-2013 Jussi Kivilinna <jussi.kivilinna@iki.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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ * USA
+ *
+ */
+
+#include <linux/module.h>
+#include <crypto/b128ops.h>
+#include <crypto/gf128mul.h>
+#include <crypto/internal/skcipher.h>
+#include <crypto/xts.h>
+#include <asm/crypto/glue_helper.h>
+
+int glue_ecb_req_128bit(const struct common_glue_ctx *gctx,
+ struct skcipher_request *req)
+{
+ void *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
+ const unsigned int bsize = 128 / 8;
+ struct skcipher_walk walk;
+ bool fpu_enabled = false;
+ unsigned int nbytes;
+ int err;
+
+ err = skcipher_walk_virt(&walk, req, false);
+
+ while ((nbytes = walk.nbytes)) {
+ const u8 *src = walk.src.virt.addr;
+ u8 *dst = walk.dst.virt.addr;
+ unsigned int func_bytes;
+ unsigned int i;
+
+ fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
+ &walk, fpu_enabled, nbytes);
+ for (i = 0; i < gctx->num_funcs; i++) {
+ func_bytes = bsize * gctx->funcs[i].num_blocks;
+
+ if (nbytes < func_bytes)
+ continue;
+
+ /* Process multi-block batch */
+ do {
+ gctx->funcs[i].fn_u.ecb(ctx, dst, src);
+ src += func_bytes;
+ dst += func_bytes;
+ nbytes -= func_bytes;
+ } while (nbytes >= func_bytes);
+
+ if (nbytes < bsize)
+ break;
+ }
+ err = skcipher_walk_done(&walk, nbytes);
+ }
+
+ glue_fpu_end(fpu_enabled);
+ return err;
+}
+EXPORT_SYMBOL_GPL(glue_ecb_req_128bit);
+
+int glue_cbc_encrypt_req_128bit(const common_glue_func_t fn,
+ struct skcipher_request *req)
+{
+ void *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
+ const unsigned int bsize = 128 / 8;
+ struct skcipher_walk walk;
+ unsigned int nbytes;
+ int err;
+
+ err = skcipher_walk_virt(&walk, req, false);
+
+ while ((nbytes = walk.nbytes)) {
+ const u128 *src = (u128 *)walk.src.virt.addr;
+ u128 *dst = (u128 *)walk.dst.virt.addr;
+ u128 *iv = (u128 *)walk.iv;
+
+ do {
+ u128_xor(dst, src, iv);
+ fn(ctx, (u8 *)dst, (u8 *)dst);
+ iv = dst;
+ src++;
+ dst++;
+ nbytes -= bsize;
+ } while (nbytes >= bsize);
+
+ *(u128 *)walk.iv = *iv;
+ err = skcipher_walk_done(&walk, nbytes);
+ }
+ return err;
+}
+EXPORT_SYMBOL_GPL(glue_cbc_encrypt_req_128bit);
+
+int glue_cbc_decrypt_req_128bit(const struct common_glue_ctx *gctx,
+ struct skcipher_request *req)
+{
+ void *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
+ const unsigned int bsize = 128 / 8;
+ struct skcipher_walk walk;
+ bool fpu_enabled = false;
+ unsigned int nbytes;
+ int err;
+
+ err = skcipher_walk_virt(&walk, req, false);
+
+ while ((nbytes = walk.nbytes)) {
+ const u128 *src = walk.src.virt.addr;
+ u128 *dst = walk.dst.virt.addr;
+ unsigned int func_bytes, num_blocks;
+ unsigned int i;
+ u128 last_iv;
+
+ fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
+ &walk, fpu_enabled, nbytes);
+ /* Start of the last block. */
+ src += nbytes / bsize - 1;
+ dst += nbytes / bsize - 1;
+
+ last_iv = *src;
+
+ for (i = 0; i < gctx->num_funcs; i++) {
+ num_blocks = gctx->funcs[i].num_blocks;
+ func_bytes = bsize * num_blocks;
+
+ if (nbytes < func_bytes)
+ continue;
+
+ /* Process multi-block batch */
+ do {
+ src -= num_blocks - 1;
+ dst -= num_blocks - 1;
+
+ gctx->funcs[i].fn_u.cbc(ctx, dst, src);
+
+ nbytes -= func_bytes;
+ if (nbytes < bsize)
+ goto done;
+
+ u128_xor(dst, dst, --src);
+ dst--;
+ } while (nbytes >= func_bytes);
+ }
+done:
+ u128_xor(dst, dst, (u128 *)walk.iv);
+ *(u128 *)walk.iv = last_iv;
+ err = skcipher_walk_done(&walk, nbytes);
+ }
+
+ glue_fpu_end(fpu_enabled);
+ return err;
+}
+EXPORT_SYMBOL_GPL(glue_cbc_decrypt_req_128bit);
+
+int glue_ctr_req_128bit(const struct common_glue_ctx *gctx,
+ struct skcipher_request *req)
+{
+ void *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
+ const unsigned int bsize = 128 / 8;
+ struct skcipher_walk walk;
+ bool fpu_enabled = false;
+ unsigned int nbytes;
+ int err;
+
+ err = skcipher_walk_virt(&walk, req, false);
+
+ while ((nbytes = walk.nbytes) >= bsize) {
+ const u128 *src = walk.src.virt.addr;
+ u128 *dst = walk.dst.virt.addr;
+ unsigned int func_bytes, num_blocks;
+ unsigned int i;
+ le128 ctrblk;
+
+ fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
+ &walk, fpu_enabled, nbytes);
+
+ be128_to_le128(&ctrblk, (be128 *)walk.iv);
+
+ for (i = 0; i < gctx->num_funcs; i++) {
+ num_blocks = gctx->funcs[i].num_blocks;
+ func_bytes = bsize * num_blocks;
+
+ if (nbytes < func_bytes)
+ continue;
+
+ /* Process multi-block batch */
+ do {
+ gctx->funcs[i].fn_u.ctr(ctx, dst, src, &ctrblk);
+ src += num_blocks;
+ dst += num_blocks;
+ nbytes -= func_bytes;
+ } while (nbytes >= func_bytes);
+
+ if (nbytes < bsize)
+ break;
+ }
+
+ le128_to_be128((be128 *)walk.iv, &ctrblk);
+ err = skcipher_walk_done(&walk, nbytes);
+ }
+
+ glue_fpu_end(fpu_enabled);
+
+ if (nbytes) {
+ le128 ctrblk;
+ u128 tmp;
+
+ be128_to_le128(&ctrblk, (be128 *)walk.iv);
+ memcpy(&tmp, walk.src.virt.addr, nbytes);
+ gctx->funcs[gctx->num_funcs - 1].fn_u.ctr(ctx, &tmp, &tmp,
+ &ctrblk);
+ memcpy(walk.dst.virt.addr, &tmp, nbytes);
+ le128_to_be128((be128 *)walk.iv, &ctrblk);
+
+ err = skcipher_walk_done(&walk, 0);
+ }
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(glue_ctr_req_128bit);
+
+static unsigned int __glue_xts_req_128bit(const struct common_glue_ctx *gctx,
+ void *ctx,
+ struct skcipher_walk *walk)
+{
+ const unsigned int bsize = 128 / 8;
+ unsigned int nbytes = walk->nbytes;
+ u128 *src = walk->src.virt.addr;
+ u128 *dst = walk->dst.virt.addr;
+ unsigned int num_blocks, func_bytes;
+ unsigned int i;
+
+ /* Process multi-block batch */
+ for (i = 0; i < gctx->num_funcs; i++) {
+ num_blocks = gctx->funcs[i].num_blocks;
+ func_bytes = bsize * num_blocks;
+
+ if (nbytes >= func_bytes) {
+ do {
+ gctx->funcs[i].fn_u.xts(ctx, dst, src,
+ walk->iv);
+
+ src += num_blocks;
+ dst += num_blocks;
+ nbytes -= func_bytes;
+ } while (nbytes >= func_bytes);
+
+ if (nbytes < bsize)
+ goto done;
+ }
+ }
+
+done:
+ return nbytes;
+}
+
+int glue_xts_req_128bit(const struct common_glue_ctx *gctx,
+ struct skcipher_request *req,
+ common_glue_func_t tweak_fn, void *tweak_ctx,
+ void *crypt_ctx)
+{
+ const unsigned int bsize = 128 / 8;
+ struct skcipher_walk walk;
+ bool fpu_enabled = false;
+ unsigned int nbytes;
+ int err;
+
+ err = skcipher_walk_virt(&walk, req, false);
+ nbytes = walk.nbytes;
+ if (!nbytes)
+ return err;
+
+ /* set minimum length to bsize, for tweak_fn */
+ fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
+ &walk, fpu_enabled,
+ nbytes < bsize ? bsize : nbytes);
+
+ /* calculate first value of T */
+ tweak_fn(tweak_ctx, walk.iv, walk.iv);
+
+ while (nbytes) {
+ nbytes = __glue_xts_req_128bit(gctx, crypt_ctx, &walk);
+
+ err = skcipher_walk_done(&walk, nbytes);
+ nbytes = walk.nbytes;
+ }
+
+ glue_fpu_end(fpu_enabled);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(glue_xts_req_128bit);
+
+void glue_xts_crypt_128bit_one(void *ctx, u128 *dst, const u128 *src, le128 *iv,
+ common_glue_func_t fn)
+{
+ le128 ivblk = *iv;
+
+ /* generate next IV */
+ gf128mul_x_ble(iv, &ivblk);
+
+ /* CC <- T xor C */
+ u128_xor(dst, src, (u128 *)&ivblk);
+
+ /* PP <- D(Key2,CC) */
+ fn(ctx, (u8 *)dst, (u8 *)dst);
+
+ /* P <- T xor PP */
+ u128_xor(dst, dst, (u128 *)&ivblk);
+}
+EXPORT_SYMBOL_GPL(glue_xts_crypt_128bit_one);
+
+MODULE_LICENSE("GPL");
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