crypto: serpent-avx: remove duplicated glue code and use shared glue code from glue_h...
Jussi Kivilinna [Mon, 18 Jun 2012 11:07:24 +0000 (14:07 +0300)]
Now that shared glue code is available, convert serpent-avx to use it.

Cc: Johannes Goetzfried <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/x86/crypto/serpent_avx_glue.c
crypto/Kconfig

index 31eb567..c61b91a 100644 (file)
 #include <crypto/ctr.h>
 #include <crypto/lrw.h>
 #include <crypto/xts.h>
-#include <asm/i387.h>
 #include <asm/xcr.h>
 #include <asm/xsave.h>
 #include <asm/serpent-avx.h>
 #include <asm/crypto/ablk_helper.h>
-#include <crypto/scatterwalk.h>
-#include <linux/workqueue.h>
-#include <linux/spinlock.h>
+#include <asm/crypto/glue_helper.h>
 
-static inline bool serpent_fpu_begin(bool fpu_enabled, unsigned int nbytes)
+static void serpent_decrypt_cbc_xway(void *ctx, u128 *dst, const u128 *src)
 {
-       if (fpu_enabled)
-               return true;
-
-       /* AVX is only used when chunk to be processed is large enough, so
-        * do not enable FPU until it is necessary.
-        */
-       if (nbytes < SERPENT_BLOCK_SIZE * SERPENT_PARALLEL_BLOCKS)
-               return false;
-
-       kernel_fpu_begin();
-       return true;
-}
-
-static inline void serpent_fpu_end(bool fpu_enabled)
-{
-       if (fpu_enabled)
-               kernel_fpu_end();
-}
-
-static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk,
-                    bool enc)
-{
-       bool fpu_enabled = false;
-       struct serpent_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
-       const unsigned int bsize = SERPENT_BLOCK_SIZE;
-       unsigned int nbytes;
-       int err;
+       u128 ivs[SERPENT_PARALLEL_BLOCKS - 1];
+       unsigned int j;
 
-       err = blkcipher_walk_virt(desc, walk);
-       desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
+       for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++)
+               ivs[j] = src[j];
 
-       while ((nbytes = walk->nbytes)) {
-               u8 *wsrc = walk->src.virt.addr;
-               u8 *wdst = walk->dst.virt.addr;
-
-               fpu_enabled = serpent_fpu_begin(fpu_enabled, nbytes);
-
-               /* Process multi-block batch */
-               if (nbytes >= bsize * SERPENT_PARALLEL_BLOCKS) {
-                       do {
-                               if (enc)
-                                       serpent_enc_blk_xway(ctx, wdst, wsrc);
-                               else
-                                       serpent_dec_blk_xway(ctx, wdst, wsrc);
-
-                               wsrc += bsize * SERPENT_PARALLEL_BLOCKS;
-                               wdst += bsize * SERPENT_PARALLEL_BLOCKS;
-                               nbytes -= bsize * SERPENT_PARALLEL_BLOCKS;
-                       } while (nbytes >= bsize * SERPENT_PARALLEL_BLOCKS);
-
-                       if (nbytes < bsize)
-                               goto done;
-               }
-
-               /* Handle leftovers */
-               do {
-                       if (enc)
-                               __serpent_encrypt(ctx, wdst, wsrc);
-                       else
-                               __serpent_decrypt(ctx, wdst, wsrc);
-
-                       wsrc += bsize;
-                       wdst += bsize;
-                       nbytes -= bsize;
-               } while (nbytes >= bsize);
-
-done:
-               err = blkcipher_walk_done(desc, walk, nbytes);
-       }
+       serpent_dec_blk_xway(ctx, (u8 *)dst, (u8 *)src);
 
-       serpent_fpu_end(fpu_enabled);
-       return err;
+       for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++)
+               u128_xor(dst + (j + 1), dst + (j + 1), ivs + j);
 }
 
-static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
-                      struct scatterlist *src, unsigned int nbytes)
+static void serpent_crypt_ctr(void *ctx, u128 *dst, const u128 *src, u128 *iv)
 {
-       struct blkcipher_walk walk;
-
-       blkcipher_walk_init(&walk, dst, src, nbytes);
-       return ecb_crypt(desc, &walk, true);
-}
+       be128 ctrblk;
 
-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, false);
+       __serpent_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
+       u128_xor(dst, src, (u128 *)&ctrblk);
 }
 
-static unsigned int __cbc_encrypt(struct blkcipher_desc *desc,
-                                 struct blkcipher_walk *walk)
+static void serpent_crypt_ctr_xway(void *ctx, u128 *dst, const u128 *src,
+                                  u128 *iv)
 {
-       struct serpent_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
-       const unsigned int bsize = SERPENT_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);
-               __serpent_encrypt(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[SERPENT_PARALLEL_BLOCKS];
+       unsigned int i;
 
-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);
+       for (i = 0; i < SERPENT_PARALLEL_BLOCKS; i++) {
+               if (dst != src)
+                       dst[i] = src[i];
 
-       while ((nbytes = walk.nbytes)) {
-               nbytes = __cbc_encrypt(desc, &walk);
-               err = blkcipher_walk_done(desc, &walk, nbytes);
+               u128_to_be128(&ctrblks[i], iv);
+               u128_inc(iv);
        }
 
-       return err;
+       serpent_enc_blk_xway_xor(ctx, (u8 *)dst, (u8 *)ctrblks);
 }
 
-static unsigned int __cbc_decrypt(struct blkcipher_desc *desc,
-                                 struct blkcipher_walk *walk)
-{
-       struct serpent_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
-       const unsigned int bsize = SERPENT_BLOCK_SIZE;
-       unsigned int nbytes = walk->nbytes;
-       u128 *src = (u128 *)walk->src.virt.addr;
-       u128 *dst = (u128 *)walk->dst.virt.addr;
-       u128 ivs[SERPENT_PARALLEL_BLOCKS - 1];
-       u128 last_iv;
-       int i;
-
-       /* Start of the last block. */
-       src += nbytes / bsize - 1;
-       dst += nbytes / bsize - 1;
-
-       last_iv = *src;
-
-       /* Process multi-block batch */
-       if (nbytes >= bsize * SERPENT_PARALLEL_BLOCKS) {
-               do {
-                       nbytes -= bsize * (SERPENT_PARALLEL_BLOCKS - 1);
-                       src -= SERPENT_PARALLEL_BLOCKS - 1;
-                       dst -= SERPENT_PARALLEL_BLOCKS - 1;
-
-                       for (i = 0; i < SERPENT_PARALLEL_BLOCKS - 1; i++)
-                               ivs[i] = src[i];
-
-                       serpent_dec_blk_xway(ctx, (u8 *)dst, (u8 *)src);
-
-                       for (i = 0; i < SERPENT_PARALLEL_BLOCKS - 1; i++)
-                               u128_xor(dst + (i + 1), dst + (i + 1), ivs + i);
-
-                       nbytes -= bsize;
-                       if (nbytes < bsize)
-                               goto done;
-
-                       u128_xor(dst, dst, src - 1);
-                       src -= 1;
-                       dst -= 1;
-               } while (nbytes >= bsize * SERPENT_PARALLEL_BLOCKS);
-
-               if (nbytes < bsize)
-                       goto done;
-       }
-
-       /* Handle leftovers */
-       for (;;) {
-               __serpent_decrypt(ctx, (u8 *)dst, (u8 *)src);
-
-               nbytes -= bsize;
-               if (nbytes < bsize)
-                       break;
+static const struct common_glue_ctx serpent_enc = {
+       .num_funcs = 2,
+       .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
+
+       .funcs = { {
+               .num_blocks = SERPENT_PARALLEL_BLOCKS,
+               .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_enc_blk_xway) }
+       }, {
+               .num_blocks = 1,
+               .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_encrypt) }
+       } }
+};
 
-               u128_xor(dst, dst, src - 1);
-               src -= 1;
-               dst -= 1;
-       }
+static const struct common_glue_ctx serpent_ctr = {
+       .num_funcs = 2,
+       .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
+
+       .funcs = { {
+               .num_blocks = SERPENT_PARALLEL_BLOCKS,
+               .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr_xway) }
+       }, {
+               .num_blocks = 1,
+               .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr) }
+       } }
+};
 
-done:
-       u128_xor(dst, dst, (u128 *)walk->iv);
-       *(u128 *)walk->iv = last_iv;
+static const struct common_glue_ctx serpent_dec = {
+       .num_funcs = 2,
+       .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
+
+       .funcs = { {
+               .num_blocks = SERPENT_PARALLEL_BLOCKS,
+               .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_dec_blk_xway) }
+       }, {
+               .num_blocks = 1,
+               .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_decrypt) }
+       } }
+};
 
-       return nbytes;
-}
+static const struct common_glue_ctx serpent_dec_cbc = {
+       .num_funcs = 2,
+       .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
+
+       .funcs = { {
+               .num_blocks = SERPENT_PARALLEL_BLOCKS,
+               .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_decrypt_cbc_xway) }
+       }, {
+               .num_blocks = 1,
+               .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__serpent_decrypt) }
+       } }
+};
 
-static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
                       struct scatterlist *src, unsigned int nbytes)
 {
-       bool fpu_enabled = false;
-       struct blkcipher_walk walk;
-       int err;
-
-       blkcipher_walk_init(&walk, dst, src, nbytes);
-       err = blkcipher_walk_virt(desc, &walk);
-       desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
-
-       while ((nbytes = walk.nbytes)) {
-               fpu_enabled = serpent_fpu_begin(fpu_enabled, nbytes);
-               nbytes = __cbc_decrypt(desc, &walk);
-               err = blkcipher_walk_done(desc, &walk, nbytes);
-       }
-
-       serpent_fpu_end(fpu_enabled);
-       return err;
+       return glue_ecb_crypt_128bit(&serpent_enc, desc, dst, src, nbytes);
 }
 
-static inline void u128_to_be128(be128 *dst, const u128 *src)
+static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+                      struct scatterlist *src, unsigned int nbytes)
 {
-       dst->a = cpu_to_be64(src->a);
-       dst->b = cpu_to_be64(src->b);
+       return glue_ecb_crypt_128bit(&serpent_dec, desc, dst, src, nbytes);
 }
 
-static inline void be128_to_u128(u128 *dst, const be128 *src)
+static int cbc_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_cbc_encrypt_128bit(GLUE_FUNC_CAST(__serpent_encrypt), desc,
+                                    dst, src, nbytes);
 }
 
-static inline void u128_inc(u128 *i)
+static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+                      struct scatterlist *src, unsigned int nbytes)
 {
-       i->b++;
-       if (!i->b)
-               i->a++;
+       return glue_cbc_decrypt_128bit(&serpent_dec_cbc, desc, dst, src,
+                                      nbytes);
 }
 
-static void ctr_crypt_final(struct blkcipher_desc *desc,
-                           struct blkcipher_walk *walk)
+static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+                    struct scatterlist *src, unsigned int nbytes)
 {
-       struct serpent_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
-       u8 *ctrblk = walk->iv;
-       u8 keystream[SERPENT_BLOCK_SIZE];
-       u8 *src = walk->src.virt.addr;
-       u8 *dst = walk->dst.virt.addr;
-       unsigned int nbytes = walk->nbytes;
-
-       __serpent_encrypt(ctx, keystream, ctrblk);
-       crypto_xor(keystream, src, nbytes);
-       memcpy(dst, keystream, nbytes);
-
-       crypto_inc(ctrblk, SERPENT_BLOCK_SIZE);
+       return glue_ctr_crypt_128bit(&serpent_ctr, desc, dst, src, nbytes);
 }
 
-static unsigned int __ctr_crypt(struct blkcipher_desc *desc,
-                               struct blkcipher_walk *walk)
+static inline bool serpent_fpu_begin(bool fpu_enabled, unsigned int nbytes)
 {
-       struct serpent_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
-       const unsigned int bsize = SERPENT_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[SERPENT_PARALLEL_BLOCKS];
-       int i;
-
-       be128_to_u128(&ctrblk, (be128 *)walk->iv);
-
-       /* Process multi-block batch */
-       if (nbytes >= bsize * SERPENT_PARALLEL_BLOCKS) {
-               do {
-                       /* create ctrblks for parallel encrypt */
-                       for (i = 0; i < SERPENT_PARALLEL_BLOCKS; i++) {
-                               if (dst != src)
-                                       dst[i] = src[i];
-
-                               u128_to_be128(&ctrblocks[i], &ctrblk);
-                               u128_inc(&ctrblk);
-                       }
-
-                       serpent_enc_blk_xway_xor(ctx, (u8 *)dst,
-                                                (u8 *)ctrblocks);
-
-                       src += SERPENT_PARALLEL_BLOCKS;
-                       dst += SERPENT_PARALLEL_BLOCKS;
-                       nbytes -= bsize * SERPENT_PARALLEL_BLOCKS;
-               } while (nbytes >= bsize * SERPENT_PARALLEL_BLOCKS);
-
-               if (nbytes < bsize)
-                       goto done;
-       }
-
-       /* Handle leftovers */
-       do {
-               if (dst != src)
-                       *dst = *src;
-
-               u128_to_be128(&ctrblocks[0], &ctrblk);
-               u128_inc(&ctrblk);
-
-               __serpent_encrypt(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_fpu_begin(SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS,
+                             NULL, fpu_enabled, nbytes);
 }
 
-static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
-                    struct scatterlist *src, unsigned int nbytes)
+static inline void serpent_fpu_end(bool fpu_enabled)
 {
-       bool fpu_enabled = false;
-       struct blkcipher_walk walk;
-       int err;
-
-       blkcipher_walk_init(&walk, dst, src, nbytes);
-       err = blkcipher_walk_virt_block(desc, &walk, SERPENT_BLOCK_SIZE);
-       desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
-
-       while ((nbytes = walk.nbytes) >= SERPENT_BLOCK_SIZE) {
-               fpu_enabled = serpent_fpu_begin(fpu_enabled, nbytes);
-               nbytes = __ctr_crypt(desc, &walk);
-               err = blkcipher_walk_done(desc, &walk, nbytes);
-       }
-
-       serpent_fpu_end(fpu_enabled);
-
-       if (walk.nbytes) {
-               ctr_crypt_final(desc, &walk);
-               err = blkcipher_walk_done(desc, &walk, 0);
-       }
-
-       return err;
+       glue_fpu_end(fpu_enabled);
 }
 
 struct crypt_priv {
index 92b4697..a86c2fb 100644 (file)
@@ -842,6 +842,7 @@ config CRYPTO_SERPENT_AVX_X86_64
        select CRYPTO_ALGAPI
        select CRYPTO_CRYPTD
        select CRYPTO_ABLK_HELPER_X86
+       select CRYPTO_GLUE_HELPER_X86
        select CRYPTO_SERPENT
        select CRYPTO_LRW
        select CRYPTO_XTS