Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=3c7f076da557eadb37240d70b0399ff9763fa2ae
Commit:     3c7f076da557eadb37240d70b0399ff9763fa2ae
Parent:     7613636def82092a5c7b6322078a2af832410417
Author:     Herbert Xu <[EMAIL PROTECTED]>
AuthorDate: Tue Nov 20 17:33:39 2007 +0800
Committer:  Herbert Xu <[EMAIL PROTECTED]>
CommitDate: Fri Jan 11 08:16:18 2008 +1100

    [CRYPTO] cbc: Use crypto_xor
    
    This patch replaces the custom xor in CBC with the generic crypto_xor.
    
    Signed-off-by: Herbert Xu <[EMAIL PROTECTED]>
---
 crypto/cbc.c |   93 ++++++++++------------------------------------------------
 1 files changed, 16 insertions(+), 77 deletions(-)

diff --git a/crypto/cbc.c b/crypto/cbc.c
index 1f2649e..b013d6f 100644
--- a/crypto/cbc.c
+++ b/crypto/cbc.c
@@ -20,7 +20,6 @@
 
 struct crypto_cbc_ctx {
        struct crypto_cipher *child;
-       void (*xor)(u8 *dst, const u8 *src, unsigned int bs);
 };
 
 static int crypto_cbc_setkey(struct crypto_tfm *parent, const u8 *key,
@@ -41,9 +40,7 @@ static int crypto_cbc_setkey(struct crypto_tfm *parent, const 
u8 *key,
 
 static int crypto_cbc_encrypt_segment(struct blkcipher_desc *desc,
                                      struct blkcipher_walk *walk,
-                                     struct crypto_cipher *tfm,
-                                     void (*xor)(u8 *, const u8 *,
-                                                 unsigned int))
+                                     struct crypto_cipher *tfm)
 {
        void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
                crypto_cipher_alg(tfm)->cia_encrypt;
@@ -54,7 +51,7 @@ static int crypto_cbc_encrypt_segment(struct blkcipher_desc 
*desc,
        u8 *iv = walk->iv;
 
        do {
-               xor(iv, src, bsize);
+               crypto_xor(iv, src, bsize);
                fn(crypto_cipher_tfm(tfm), dst, iv);
                memcpy(iv, dst, bsize);
 
@@ -67,9 +64,7 @@ static int crypto_cbc_encrypt_segment(struct blkcipher_desc 
*desc,
 
 static int crypto_cbc_encrypt_inplace(struct blkcipher_desc *desc,
                                      struct blkcipher_walk *walk,
-                                     struct crypto_cipher *tfm,
-                                     void (*xor)(u8 *, const u8 *,
-                                                 unsigned int))
+                                     struct crypto_cipher *tfm)
 {
        void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
                crypto_cipher_alg(tfm)->cia_encrypt;
@@ -79,7 +74,7 @@ static int crypto_cbc_encrypt_inplace(struct blkcipher_desc 
*desc,
        u8 *iv = walk->iv;
 
        do {
-               xor(src, iv, bsize);
+               crypto_xor(src, iv, bsize);
                fn(crypto_cipher_tfm(tfm), src, src);
                iv = src;
 
@@ -99,7 +94,6 @@ static int crypto_cbc_encrypt(struct blkcipher_desc *desc,
        struct crypto_blkcipher *tfm = desc->tfm;
        struct crypto_cbc_ctx *ctx = crypto_blkcipher_ctx(tfm);
        struct crypto_cipher *child = ctx->child;
-       void (*xor)(u8 *, const u8 *, unsigned int bs) = ctx->xor;
        int err;
 
        blkcipher_walk_init(&walk, dst, src, nbytes);
@@ -107,11 +101,9 @@ static int crypto_cbc_encrypt(struct blkcipher_desc *desc,
 
        while ((nbytes = walk.nbytes)) {
                if (walk.src.virt.addr == walk.dst.virt.addr)
-                       nbytes = crypto_cbc_encrypt_inplace(desc, &walk, child,
-                                                           xor);
+                       nbytes = crypto_cbc_encrypt_inplace(desc, &walk, child);
                else
-                       nbytes = crypto_cbc_encrypt_segment(desc, &walk, child,
-                                                           xor);
+                       nbytes = crypto_cbc_encrypt_segment(desc, &walk, child);
                err = blkcipher_walk_done(desc, &walk, nbytes);
        }
 
@@ -120,9 +112,7 @@ static int crypto_cbc_encrypt(struct blkcipher_desc *desc,
 
 static int crypto_cbc_decrypt_segment(struct blkcipher_desc *desc,
                                      struct blkcipher_walk *walk,
-                                     struct crypto_cipher *tfm,
-                                     void (*xor)(u8 *, const u8 *,
-                                                 unsigned int))
+                                     struct crypto_cipher *tfm)
 {
        void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
                crypto_cipher_alg(tfm)->cia_decrypt;
@@ -134,7 +124,7 @@ static int crypto_cbc_decrypt_segment(struct blkcipher_desc 
*desc,
 
        do {
                fn(crypto_cipher_tfm(tfm), dst, src);
-               xor(dst, iv, bsize);
+               crypto_xor(dst, iv, bsize);
                iv = src;
 
                src += bsize;
@@ -148,9 +138,7 @@ static int crypto_cbc_decrypt_segment(struct blkcipher_desc 
*desc,
 
 static int crypto_cbc_decrypt_inplace(struct blkcipher_desc *desc,
                                      struct blkcipher_walk *walk,
-                                     struct crypto_cipher *tfm,
-                                     void (*xor)(u8 *, const u8 *,
-                                                 unsigned int))
+                                     struct crypto_cipher *tfm)
 {
        void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
                crypto_cipher_alg(tfm)->cia_decrypt;
@@ -171,11 +159,11 @@ static int crypto_cbc_decrypt_inplace(struct 
blkcipher_desc *desc,
                fn(crypto_cipher_tfm(tfm), src, src);
                if ((nbytes -= bsize) < bsize)
                        break;
-               xor(src, src - bsize, bsize);
+               crypto_xor(src, src - bsize, bsize);
                src -= bsize;
        }
 
-       xor(src, first_iv, bsize);
+       crypto_xor(src, first_iv, bsize);
 
        return nbytes;
 }
@@ -188,7 +176,6 @@ static int crypto_cbc_decrypt(struct blkcipher_desc *desc,
        struct crypto_blkcipher *tfm = desc->tfm;
        struct crypto_cbc_ctx *ctx = crypto_blkcipher_ctx(tfm);
        struct crypto_cipher *child = ctx->child;
-       void (*xor)(u8 *, const u8 *, unsigned int bs) = ctx->xor;
        int err;
 
        blkcipher_walk_init(&walk, dst, src, nbytes);
@@ -196,48 +183,15 @@ static int crypto_cbc_decrypt(struct blkcipher_desc *desc,
 
        while ((nbytes = walk.nbytes)) {
                if (walk.src.virt.addr == walk.dst.virt.addr)
-                       nbytes = crypto_cbc_decrypt_inplace(desc, &walk, child,
-                                                           xor);
+                       nbytes = crypto_cbc_decrypt_inplace(desc, &walk, child);
                else
-                       nbytes = crypto_cbc_decrypt_segment(desc, &walk, child,
-                                                           xor);
+                       nbytes = crypto_cbc_decrypt_segment(desc, &walk, child);
                err = blkcipher_walk_done(desc, &walk, nbytes);
        }
 
        return err;
 }
 
-static void xor_byte(u8 *a, const u8 *b, unsigned int bs)
-{
-       do {
-               *a++ ^= *b++;
-       } while (--bs);
-}
-
-static void xor_quad(u8 *dst, const u8 *src, unsigned int bs)
-{
-       u32 *a = (u32 *)dst;
-       u32 *b = (u32 *)src;
-
-       do {
-               *a++ ^= *b++;
-       } while ((bs -= 4));
-}
-
-static void xor_64(u8 *a, const u8 *b, unsigned int bs)
-{
-       ((u32 *)a)[0] ^= ((u32 *)b)[0];
-       ((u32 *)a)[1] ^= ((u32 *)b)[1];
-}
-
-static void xor_128(u8 *a, const u8 *b, unsigned int bs)
-{
-       ((u32 *)a)[0] ^= ((u32 *)b)[0];
-       ((u32 *)a)[1] ^= ((u32 *)b)[1];
-       ((u32 *)a)[2] ^= ((u32 *)b)[2];
-       ((u32 *)a)[3] ^= ((u32 *)b)[3];
-}
-
 static int crypto_cbc_init_tfm(struct crypto_tfm *tfm)
 {
        struct crypto_instance *inst = (void *)tfm->__crt_alg;
@@ -245,22 +199,6 @@ static int crypto_cbc_init_tfm(struct crypto_tfm *tfm)
        struct crypto_cbc_ctx *ctx = crypto_tfm_ctx(tfm);
        struct crypto_cipher *cipher;
 
-       switch (crypto_tfm_alg_blocksize(tfm)) {
-       case 8:
-               ctx->xor = xor_64;
-               break;
-
-       case 16:
-               ctx->xor = xor_128;
-               break;
-
-       default:
-               if (crypto_tfm_alg_blocksize(tfm) % 4)
-                       ctx->xor = xor_byte;
-               else
-                       ctx->xor = xor_quad;
-       }
-
        cipher = crypto_spawn_cipher(spawn);
        if (IS_ERR(cipher))
                return PTR_ERR(cipher);
@@ -300,8 +238,9 @@ static struct crypto_instance *crypto_cbc_alloc(struct 
rtattr **tb)
        inst->alg.cra_alignmask = alg->cra_alignmask;
        inst->alg.cra_type = &crypto_blkcipher_type;
 
-       if (!(alg->cra_blocksize % 4))
-               inst->alg.cra_alignmask |= 3;
+       /* We access the data as u32s when xoring. */
+       inst->alg.cra_alignmask |= __alignof__(u32) - 1;
+
        inst->alg.cra_blkcipher.ivsize = alg->cra_blocksize;
        inst->alg.cra_blkcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
        inst->alg.cra_blkcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
-
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