crypto: twofish-x86_64-3way - remove duplicated glue code and use shared glue code...
Jussi Kivilinna [Mon, 18 Jun 2012 11:07:34 +0000 (14:07 +0300)]
Now that shared glue code is available, convert twofish-x86_64-3way to use it.

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/x86/crypto/twofish_glue_3way.c
crypto/Kconfig

index 77e4e55..25bf5e9 100644 (file)
@@ -3,11 +3,6 @@
  *
  * 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>
- * 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
@@ -33,6 +28,7 @@
 #include <crypto/algapi.h>
 #include <crypto/twofish.h>
 #include <crypto/b128ops.h>
+#include <asm/crypto/glue_helper.h>
 #include <crypto/lrw.h>
 #include <crypto/xts.h>
 
@@ -62,311 +58,136 @@ static inline void twofish_enc_blk_xor_3way(struct twofish_ctx *ctx, u8 *dst,
        __twofish_enc_blk_3way(ctx, dst, src, true);
 }
 
-static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk,
-                    void (*fn)(struct twofish_ctx *, u8 *, const u8 *),
-                    void (*fn_3way)(struct twofish_ctx *, u8 *, const u8 *))
+static void twofish_dec_blk_cbc_3way(void *ctx, u128 *dst, const u128 *src)
 {
-       struct twofish_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
-       unsigned int bsize = TF_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 three block batch */
-               if (nbytes >= bsize * 3) {
-                       do {
-                               fn_3way(ctx, wdst, wsrc);
+       u128 ivs[2];
 
-                               wsrc += bsize * 3;
-                               wdst += bsize * 3;
-                               nbytes -= bsize * 3;
-                       } while (nbytes >= bsize * 3);
+       ivs[0] = src[0];
+       ivs[1] = src[1];
 
-                       if (nbytes < bsize)
-                               goto done;
-               }
-
-               /* Handle leftovers */
-               do {
-                       fn(ctx, wdst, wsrc);
-
-                       wsrc += bsize;
-                       wdst += bsize;
-                       nbytes -= bsize;
-               } while (nbytes >= bsize);
-
-done:
-               err = blkcipher_walk_done(desc, walk, nbytes);
-       }
+       twofish_dec_blk_3way(ctx, (u8 *)dst, (u8 *)src);
 
-       return err;
+       u128_xor(&dst[1], &dst[1], &ivs[0]);
+       u128_xor(&dst[2], &dst[2], &ivs[1]);
 }
 
-static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
-                      struct scatterlist *src, unsigned int nbytes)
+static void twofish_enc_blk_ctr(void *ctx, u128 *dst, const u128 *src, u128 *iv)
 {
-       struct blkcipher_walk walk;
+       be128 ctrblk;
 
-       blkcipher_walk_init(&walk, dst, src, nbytes);
-       return ecb_crypt(desc, &walk, twofish_enc_blk, twofish_enc_blk_3way);
-}
+       if (dst != src)
+               *dst = *src;
 
-static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
-                      struct scatterlist *src, unsigned int nbytes)
-{
-       struct blkcipher_walk walk;
+       u128_to_be128(&ctrblk, iv);
+       u128_inc(iv);
 
-       blkcipher_walk_init(&walk, dst, src, nbytes);
-       return ecb_crypt(desc, &walk, twofish_dec_blk, twofish_dec_blk_3way);
+       twofish_enc_blk(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
+       u128_xor(dst, dst, (u128 *)&ctrblk);
 }
 
-static unsigned int __cbc_encrypt(struct blkcipher_desc *desc,
-                                 struct blkcipher_walk *walk)
+static void twofish_enc_blk_ctr_3way(void *ctx, u128 *dst, const u128 *src,
+                                    u128 *iv)
 {
-       struct twofish_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
-       unsigned int bsize = TF_BLOCK_SIZE;
-       unsigned int nbytes = walk->nbytes;
-       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);
-               twofish_enc_blk(ctx, (u8 *)dst, (u8 *)dst);
-               iv = dst;
-
-               src += 1;
-               dst += 1;
-               nbytes -= bsize;
-       } while (nbytes >= bsize);
-
-       u128_xor((u128 *)walk->iv, (u128 *)walk->iv, iv);
-       return nbytes;
-}
+       be128 ctrblks[3];
 
-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 twofish_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
-       unsigned int bsize = TF_BLOCK_SIZE;
-       unsigned int nbytes = walk->nbytes;
-       u128 *src = (u128 *)walk->src.virt.addr;
-       u128 *dst = (u128 *)walk->dst.virt.addr;
-       u128 ivs[3 - 1];
-       u128 last_iv;
-
-       /* Start of the last block. */
-       src += nbytes / bsize - 1;
-       dst += nbytes / bsize - 1;
-
-       last_iv = *src;
-
-       /* Process three block batch */
-       if (nbytes >= bsize * 3) {
-               do {
-                       nbytes -= bsize * (3 - 1);
-                       src -= 3 - 1;
-                       dst -= 3 - 1;
-
-                       ivs[0] = src[0];
-                       ivs[1] = src[1];
-
-                       twofish_dec_blk_3way(ctx, (u8 *)dst, (u8 *)src);
-
-                       u128_xor(dst + 1, dst + 1, ivs + 0);
-                       u128_xor(dst + 2, dst + 2, ivs + 1);
-
-                       nbytes -= bsize;
-                       if (nbytes < bsize)
-                               goto done;
-
-                       u128_xor(dst, dst, src - 1);
-                       src -= 1;
-                       dst -= 1;
-               } while (nbytes >= bsize * 3);
-
-               if (nbytes < bsize)
-                       goto done;
-       }
-
-       /* Handle leftovers */
-       for (;;) {
-               twofish_dec_blk(ctx, (u8 *)dst, (u8 *)src);
-
-               nbytes -= bsize;
-               if (nbytes < bsize)
-                       break;
-
-               u128_xor(dst, dst, src - 1);
-               src -= 1;
-               dst -= 1;
+       if (dst != src) {
+               dst[0] = src[0];
+               dst[1] = src[1];
+               dst[2] = src[2];
        }
 
-done:
-       u128_xor(dst, dst, (u128 *)walk->iv);
-       *(u128 *)walk->iv = last_iv;
+       u128_to_be128(&ctrblks[0], iv);
+       u128_inc(iv);
+       u128_to_be128(&ctrblks[1], iv);
+       u128_inc(iv);
+       u128_to_be128(&ctrblks[2], iv);
+       u128_inc(iv);
 
-       return nbytes;
+       twofish_enc_blk_xor_3way(ctx, (u8 *)dst, (u8 *)ctrblks);
 }
 
-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);
+static const struct common_glue_ctx twofish_enc = {
+       .num_funcs = 2,
+       .fpu_blocks_limit = -1,
+
+       .funcs = { {
+               .num_blocks = 3,
+               .fn_u = { .ecb = GLUE_FUNC_CAST(twofish_enc_blk_3way) }
+       }, {
+               .num_blocks = 1,
+               .fn_u = { .ecb = GLUE_FUNC_CAST(twofish_enc_blk) }
+       } }
+};
 
-       while ((nbytes = walk.nbytes)) {
-               nbytes = __cbc_decrypt(desc, &walk);
-               err = blkcipher_walk_done(desc, &walk, nbytes);
-       }
+static const struct common_glue_ctx twofish_ctr = {
+       .num_funcs = 2,
+       .fpu_blocks_limit = -1,
+
+       .funcs = { {
+               .num_blocks = 3,
+               .fn_u = { .ecb = GLUE_FUNC_CAST(twofish_enc_blk_ctr_3way) }
+       }, {
+               .num_blocks = 1,
+               .fn_u = { .ecb = GLUE_FUNC_CAST(twofish_enc_blk_ctr) }
+       } }
+};
 
-       return err;
-}
+static const struct common_glue_ctx twofish_dec = {
+       .num_funcs = 2,
+       .fpu_blocks_limit = -1,
+
+       .funcs = { {
+               .num_blocks = 3,
+               .fn_u = { .ecb = GLUE_FUNC_CAST(twofish_dec_blk_3way) }
+       }, {
+               .num_blocks = 1,
+               .fn_u = { .ecb = GLUE_FUNC_CAST(twofish_dec_blk) }
+       } }
+};
 
-static inline void u128_to_be128(be128 *dst, const u128 *src)
-{
-       dst->a = cpu_to_be64(src->a);
-       dst->b = cpu_to_be64(src->b);
-}
+static const struct common_glue_ctx twofish_dec_cbc = {
+       .num_funcs = 2,
+       .fpu_blocks_limit = -1,
+
+       .funcs = { {
+               .num_blocks = 3,
+               .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(twofish_dec_blk_cbc_3way) }
+       }, {
+               .num_blocks = 1,
+               .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(twofish_dec_blk) }
+       } }
+};
 
-static inline void be128_to_u128(u128 *dst, const be128 *src)
+static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+                      struct scatterlist *src, unsigned int nbytes)
 {
-       dst->a = be64_to_cpu(src->a);
-       dst->b = be64_to_cpu(src->b);
+       return glue_ecb_crypt_128bit(&twofish_enc, desc, dst, src, nbytes);
 }
 
-static inline void u128_inc(u128 *i)
+static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+                      struct scatterlist *src, unsigned int nbytes)
 {
-       i->b++;
-       if (!i->b)
-               i->a++;
+       return glue_ecb_crypt_128bit(&twofish_dec, desc, dst, src, nbytes);
 }
 
-static void ctr_crypt_final(struct blkcipher_desc *desc,
-                           struct blkcipher_walk *walk)
+static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+                      struct scatterlist *src, unsigned int nbytes)
 {
-       struct twofish_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
-       u8 *ctrblk = walk->iv;
-       u8 keystream[TF_BLOCK_SIZE];
-       u8 *src = walk->src.virt.addr;
-       u8 *dst = walk->dst.virt.addr;
-       unsigned int nbytes = walk->nbytes;
-
-       twofish_enc_blk(ctx, keystream, ctrblk);
-       crypto_xor(keystream, src, nbytes);
-       memcpy(dst, keystream, nbytes);
-
-       crypto_inc(ctrblk, TF_BLOCK_SIZE);
+       return glue_cbc_encrypt_128bit(GLUE_FUNC_CAST(twofish_enc_blk), desc,
+                                      dst, src, nbytes);
 }
 
-static unsigned int __ctr_crypt(struct blkcipher_desc *desc,
-                               struct blkcipher_walk *walk)
+static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+                      struct scatterlist *src, unsigned int nbytes)
 {
-       struct twofish_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
-       unsigned int bsize = TF_BLOCK_SIZE;
-       unsigned int nbytes = walk->nbytes;
-       u128 *src = (u128 *)walk->src.virt.addr;
-       u128 *dst = (u128 *)walk->dst.virt.addr;
-       u128 ctrblk;
-       be128 ctrblocks[3];
-
-       be128_to_u128(&ctrblk, (be128 *)walk->iv);
-
-       /* Process three block batch */
-       if (nbytes >= bsize * 3) {
-               do {
-                       if (dst != src) {
-                               dst[0] = src[0];
-                               dst[1] = src[1];
-                               dst[2] = src[2];
-                       }
-
-                       /* create ctrblks for parallel encrypt */
-                       u128_to_be128(&ctrblocks[0], &ctrblk);
-                       u128_inc(&ctrblk);
-                       u128_to_be128(&ctrblocks[1], &ctrblk);
-                       u128_inc(&ctrblk);
-                       u128_to_be128(&ctrblocks[2], &ctrblk);
-                       u128_inc(&ctrblk);
-
-                       twofish_enc_blk_xor_3way(ctx, (u8 *)dst,
-                                                (u8 *)ctrblocks);
-
-                       src += 3;
-                       dst += 3;
-                       nbytes -= bsize * 3;
-               } while (nbytes >= bsize * 3);
-
-               if (nbytes < bsize)
-                       goto done;
-       }
-
-       /* Handle leftovers */
-       do {
-               if (dst != src)
-                       *dst = *src;
-
-               u128_to_be128(&ctrblocks[0], &ctrblk);
-               u128_inc(&ctrblk);
-
-               twofish_enc_blk(ctx, (u8 *)ctrblocks, (u8 *)ctrblocks);
-               u128_xor(dst, dst, (u128 *)ctrblocks);
-
-               src += 1;
-               dst += 1;
-               nbytes -= bsize;
-       } while (nbytes >= bsize);
-
-done:
-       u128_to_be128((be128 *)walk->iv, &ctrblk);
-       return nbytes;
+       return glue_cbc_decrypt_128bit(&twofish_dec_cbc, desc, dst, src,
+                                      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, TF_BLOCK_SIZE);
-
-       while ((nbytes = walk.nbytes) >= TF_BLOCK_SIZE) {
-               nbytes = __ctr_crypt(desc, &walk);
-               err = blkcipher_walk_done(desc, &walk, nbytes);
-       }
-
-       if (walk.nbytes) {
-               ctr_crypt_final(desc, &walk);
-               err = blkcipher_walk_done(desc, &walk, 0);
-       }
-
-       return err;
+       return glue_ctr_crypt_128bit(&twofish_ctr, desc, dst, src, nbytes);
 }
 
 static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
index 72828fa..fc559ca 100644 (file)
@@ -935,6 +935,7 @@ config CRYPTO_TWOFISH_X86_64_3WAY
        select CRYPTO_ALGAPI
        select CRYPTO_TWOFISH_COMMON
        select CRYPTO_TWOFISH_X86_64
+       select CRYPTO_GLUE_HELPER_X86
        select CRYPTO_LRW
        select CRYPTO_XTS
        help