crypto: xcbc - Switch to shash
Herbert Xu [Sun, 12 Jul 2009 04:48:32 +0000 (12:48 +0800)]
This patch converts the xcbc algorithm to the new shash type.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/xcbc.c

index b63b633..b2cc855 100644 (file)
  *     Kazunori Miyazawa <miyazawa@linux-ipv6.org>
  */
 
-#include <crypto/scatterwalk.h>
-#include <linux/crypto.h>
+#include <crypto/internal/hash.h>
 #include <linux/err.h>
-#include <linux/hardirq.h>
 #include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/rtnetlink.h>
-#include <linux/slab.h>
-#include <linux/scatterlist.h>
 
 static u_int32_t ks[12] = {0x01010101, 0x01010101, 0x01010101, 0x01010101,
                           0x02020202, 0x02020202, 0x02020202, 0x02020202,
@@ -66,10 +60,10 @@ static void xor_128(u8 *a, const u8 *b, unsigned int bs)
        ((u32 *)a)[3] ^= ((u32 *)b)[3];
 }
 
-static int _crypto_xcbc_digest_setkey(struct crypto_hash *parent,
+static int _crypto_xcbc_digest_setkey(struct crypto_shash *parent,
                                      struct crypto_xcbc_ctx *ctx)
 {
-       int bs = crypto_hash_blocksize(parent);
+       int bs = crypto_shash_blocksize(parent);
        int err = 0;
        u8 key1[bs];
 
@@ -81,10 +75,10 @@ static int _crypto_xcbc_digest_setkey(struct crypto_hash *parent,
        return crypto_cipher_setkey(ctx->child, key1, bs);
 }
 
-static int crypto_xcbc_digest_setkey(struct crypto_hash *parent,
+static int crypto_xcbc_digest_setkey(struct crypto_shash *parent,
                                     const u8 *inkey, unsigned int keylen)
 {
-       struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(parent);
+       struct crypto_xcbc_ctx *ctx = crypto_shash_ctx(parent);
 
        if (keylen != crypto_cipher_blocksize(ctx->child))
                return -EINVAL;
@@ -96,10 +90,10 @@ static int crypto_xcbc_digest_setkey(struct crypto_hash *parent,
        return _crypto_xcbc_digest_setkey(parent, ctx);
 }
 
-static int crypto_xcbc_digest_init(struct hash_desc *pdesc)
+static int crypto_xcbc_digest_init(struct shash_desc *pdesc)
 {
-       struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(pdesc->tfm);
-       int bs = crypto_hash_blocksize(pdesc->tfm);
+       struct crypto_xcbc_ctx *ctx = crypto_shash_ctx(pdesc->tfm);
+       int bs = crypto_shash_blocksize(pdesc->tfm);
 
        ctx->len = 0;
        memset(ctx->odds, 0, bs);
@@ -108,102 +102,55 @@ static int crypto_xcbc_digest_init(struct hash_desc *pdesc)
        return 0;
 }
 
-static int crypto_xcbc_digest_update2(struct hash_desc *pdesc,
-                                     struct scatterlist *sg,
-                                     unsigned int nbytes)
+static int crypto_xcbc_digest_update(struct shash_desc *pdesc, const u8 *p,
+                                    unsigned int len)
 {
-       struct crypto_hash *parent = pdesc->tfm;
-       struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(parent);
+       struct crypto_shash *parent = pdesc->tfm;
+       struct crypto_xcbc_ctx *ctx = crypto_shash_ctx(parent);
        struct crypto_cipher *tfm = ctx->child;
-       int bs = crypto_hash_blocksize(parent);
-
-       for (;;) {
-               struct page *pg = sg_page(sg);
-               unsigned int offset = sg->offset;
-               unsigned int slen = sg->length;
-
-               if (unlikely(slen > nbytes))
-                       slen = nbytes;
-
-               nbytes -= slen;
-
-               while (slen > 0) {
-                       unsigned int len = min(slen, ((unsigned int)(PAGE_SIZE)) - offset);
-                       char *p = crypto_kmap(pg, 0) + offset;
-
-                       /* checking the data can fill the block */
-                       if ((ctx->len + len) <= bs) {
-                               memcpy(ctx->odds + ctx->len, p, len);
-                               ctx->len += len;
-                               slen -= len;
-
-                               /* checking the rest of the page */
-                               if (len + offset >= PAGE_SIZE) {
-                                       offset = 0;
-                                       pg++;
-                               } else
-                                       offset += len;
-
-                               crypto_kunmap(p, 0);
-                               crypto_yield(pdesc->flags);
-                               continue;
-                       }
-
-                       /* filling odds with new data and encrypting it */
-                       memcpy(ctx->odds + ctx->len, p, bs - ctx->len);
-                       len -= bs - ctx->len;
-                       p += bs - ctx->len;
-
-                       ctx->xor(ctx->prev, ctx->odds, bs);
-                       crypto_cipher_encrypt_one(tfm, ctx->prev, ctx->prev);
-
-                       /* clearing the length */
-                       ctx->len = 0;
-
-                       /* encrypting the rest of data */
-                       while (len > bs) {
-                               ctx->xor(ctx->prev, p, bs);
-                               crypto_cipher_encrypt_one(tfm, ctx->prev,
-                                                         ctx->prev);
-                               p += bs;
-                               len -= bs;
-                       }
-
-                       /* keeping the surplus of blocksize */
-                       if (len) {
-                               memcpy(ctx->odds, p, len);
-                               ctx->len = len;
-                       }
-                       crypto_kunmap(p, 0);
-                       crypto_yield(pdesc->flags);
-                       slen -= min(slen, ((unsigned int)(PAGE_SIZE)) - offset);
-                       offset = 0;
-                       pg++;
-               }
-
-               if (!nbytes)
-                       break;
-               sg = scatterwalk_sg_next(sg);
+       int bs = crypto_shash_blocksize(parent);
+
+       /* checking the data can fill the block */
+       if ((ctx->len + len) <= bs) {
+               memcpy(ctx->odds + ctx->len, p, len);
+               ctx->len += len;
+               return 0;
        }
 
-       return 0;
-}
+       /* filling odds with new data and encrypting it */
+       memcpy(ctx->odds + ctx->len, p, bs - ctx->len);
+       len -= bs - ctx->len;
+       p += bs - ctx->len;
 
-static int crypto_xcbc_digest_update(struct hash_desc *pdesc,
-                                    struct scatterlist *sg,
-                                    unsigned int nbytes)
-{
-       if (WARN_ON_ONCE(in_irq()))
-               return -EDEADLK;
-       return crypto_xcbc_digest_update2(pdesc, sg, nbytes);
+       ctx->xor(ctx->prev, ctx->odds, bs);
+       crypto_cipher_encrypt_one(tfm, ctx->prev, ctx->prev);
+
+       /* clearing the length */
+       ctx->len = 0;
+
+       /* encrypting the rest of data */
+       while (len > bs) {
+               ctx->xor(ctx->prev, p, bs);
+               crypto_cipher_encrypt_one(tfm, ctx->prev, ctx->prev);
+               p += bs;
+               len -= bs;
+       }
+
+       /* keeping the surplus of blocksize */
+       if (len) {
+               memcpy(ctx->odds, p, len);
+               ctx->len = len;
+       }
+
+       return 0;
 }
 
-static int crypto_xcbc_digest_final(struct hash_desc *pdesc, u8 *out)
+static int crypto_xcbc_digest_final(struct shash_desc *pdesc, u8 *out)
 {
-       struct crypto_hash *parent = pdesc->tfm;
-       struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(parent);
+       struct crypto_shash *parent = pdesc->tfm;
+       struct crypto_xcbc_ctx *ctx = crypto_shash_ctx(parent);
        struct crypto_cipher *tfm = ctx->child;
-       int bs = crypto_hash_blocksize(parent);
+       int bs = crypto_shash_blocksize(parent);
        int err = 0;
 
        if (ctx->len == bs) {
@@ -248,24 +195,13 @@ static int crypto_xcbc_digest_final(struct hash_desc *pdesc, u8 *out)
        return 0;
 }
 
-static int crypto_xcbc_digest(struct hash_desc *pdesc,
-                 struct scatterlist *sg, unsigned int nbytes, u8 *out)
-{
-       if (WARN_ON_ONCE(in_irq()))
-               return -EDEADLK;
-
-       crypto_xcbc_digest_init(pdesc);
-       crypto_xcbc_digest_update2(pdesc, sg, nbytes);
-       return crypto_xcbc_digest_final(pdesc, out);
-}
-
 static int xcbc_init_tfm(struct crypto_tfm *tfm)
 {
        struct crypto_cipher *cipher;
        struct crypto_instance *inst = (void *)tfm->__crt_alg;
        struct crypto_spawn *spawn = crypto_instance_ctx(inst);
-       struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(__crypto_hash_cast(tfm));
-       int bs = crypto_hash_blocksize(__crypto_hash_cast(tfm));
+       struct crypto_xcbc_ctx *ctx = crypto_tfm_ctx(tfm);
+       int bs = crypto_tfm_alg_blocksize(tfm);
 
        cipher = crypto_spawn_cipher(spawn);
        if (IS_ERR(cipher))
@@ -289,70 +225,73 @@ static int xcbc_init_tfm(struct crypto_tfm *tfm)
 
 static void xcbc_exit_tfm(struct crypto_tfm *tfm)
 {
-       struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(__crypto_hash_cast(tfm));
+       struct crypto_xcbc_ctx *ctx = crypto_tfm_ctx(tfm);
        crypto_free_cipher(ctx->child);
 }
 
-static struct crypto_instance *xcbc_alloc(struct rtattr **tb)
+static int xcbc_create(struct crypto_template *tmpl, struct rtattr **tb)
 {
-       struct crypto_instance *inst;
+       struct shash_instance *inst;
        struct crypto_alg *alg;
        int err;
 
-       err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_HASH);
+       err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH);
        if (err)
-               return ERR_PTR(err);
+               return err;
 
        alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
                                  CRYPTO_ALG_TYPE_MASK);
        if (IS_ERR(alg))
-               return ERR_CAST(alg);
+               return PTR_ERR(alg);
 
        switch(alg->cra_blocksize) {
        case 16:
                break;
        default:
-               inst = ERR_PTR(-EINVAL);
                goto out_put_alg;
        }
 
-       inst = crypto_alloc_instance("xcbc", alg);
+       inst = shash_alloc_instance("xcbc", alg);
        if (IS_ERR(inst))
                goto out_put_alg;
 
-       inst->alg.cra_flags = CRYPTO_ALG_TYPE_HASH;
-       inst->alg.cra_priority = alg->cra_priority;
-       inst->alg.cra_blocksize = alg->cra_blocksize;
-       inst->alg.cra_alignmask = alg->cra_alignmask;
-       inst->alg.cra_type = &crypto_hash_type;
-
-       inst->alg.cra_hash.digestsize = alg->cra_blocksize;
-       inst->alg.cra_ctxsize = sizeof(struct crypto_xcbc_ctx) +
-                               ALIGN(inst->alg.cra_blocksize * 3, sizeof(void *));
-       inst->alg.cra_init = xcbc_init_tfm;
-       inst->alg.cra_exit = xcbc_exit_tfm;
-
-       inst->alg.cra_hash.init = crypto_xcbc_digest_init;
-       inst->alg.cra_hash.update = crypto_xcbc_digest_update;
-       inst->alg.cra_hash.final = crypto_xcbc_digest_final;
-       inst->alg.cra_hash.digest = crypto_xcbc_digest;
-       inst->alg.cra_hash.setkey = crypto_xcbc_digest_setkey;
+       err = crypto_init_spawn(shash_instance_ctx(inst), alg,
+                               shash_crypto_instance(inst),
+                               CRYPTO_ALG_TYPE_MASK);
+       if (err)
+               goto out_free_inst;
+
+       inst->alg.base.cra_priority = alg->cra_priority;
+       inst->alg.base.cra_blocksize = alg->cra_blocksize;
+       inst->alg.base.cra_alignmask = alg->cra_alignmask;
+
+       inst->alg.digestsize = alg->cra_blocksize;
+       inst->alg.base.cra_ctxsize = sizeof(struct crypto_xcbc_ctx) +
+                                    ALIGN(alg->cra_blocksize * 3,
+                                          sizeof(void *));
+       inst->alg.base.cra_init = xcbc_init_tfm;
+       inst->alg.base.cra_exit = xcbc_exit_tfm;
+
+       inst->alg.init = crypto_xcbc_digest_init;
+       inst->alg.update = crypto_xcbc_digest_update;
+       inst->alg.final = crypto_xcbc_digest_final;
+       inst->alg.setkey = crypto_xcbc_digest_setkey;
+
+       err = shash_register_instance(tmpl, inst);
+       if (err) {
+out_free_inst:
+               shash_free_instance(shash_crypto_instance(inst));
+       }
 
 out_put_alg:
        crypto_mod_put(alg);
-       return inst;
-}
-
-static void xcbc_free(struct crypto_instance *inst)
-{
-       crypto_drop_spawn(crypto_instance_ctx(inst));
-       kfree(inst);
+       return err;
 }
 
 static struct crypto_template crypto_xcbc_tmpl = {
        .name = "xcbc",
-       .alloc = xcbc_alloc,
-       .free = xcbc_free,
+       .create = xcbc_create,
+       .free = shash_free_instance,
        .module = THIS_MODULE,
 };