media: ov5640: change 1080p resolution to 1088p
[linux-2.6.git] / crypto / hmac.c
index 46120de..8d9544c 100644 (file)
  * HMAC: Keyed-Hashing for Message Authentication (RFC2104).
  *
  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
+ * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
  *
  * The HMAC implementation is derived from USAGI.
  * Copyright (c) 2002 Kazunori Miyazawa <miyazawa@linux-ipv6.org> / USAGI
  *
  * 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) 
+ * Software Foundation; either version 2 of the License, or (at your option)
  * any later version.
  *
  */
-#include <linux/crypto.h>
-#include <linux/mm.h>
-#include <linux/highmem.h>
-#include <linux/slab.h>
+
+#include <crypto/internal/hash.h>
+#include <crypto/scatterwalk.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/scatterlist.h>
-#include "internal.h"
+#include <linux/string.h>
+
+struct hmac_ctx {
+       struct crypto_shash *hash;
+};
+
+static inline void *align_ptr(void *p, unsigned int align)
+{
+       return (void *)ALIGN((unsigned long)p, align);
+}
 
-static void hash_key(struct crypto_tfm *tfm, u8 *key, unsigned int keylen)
+static inline struct hmac_ctx *hmac_ctx(struct crypto_shash *tfm)
 {
-       struct scatterlist tmp;
-       
-       sg_set_buf(&tmp, key, keylen);
-       crypto_digest_digest(tfm, &tmp, 1, key);
+       return align_ptr(crypto_shash_ctx_aligned(tfm) +
+                        crypto_shash_statesize(tfm) * 2,
+                        crypto_tfm_ctx_alignment());
 }
 
-int crypto_alloc_hmac_block(struct crypto_tfm *tfm)
+static int hmac_setkey(struct crypto_shash *parent,
+                      const u8 *inkey, unsigned int keylen)
 {
-       int ret = 0;
+       int bs = crypto_shash_blocksize(parent);
+       int ds = crypto_shash_digestsize(parent);
+       int ss = crypto_shash_statesize(parent);
+       char *ipad = crypto_shash_ctx_aligned(parent);
+       char *opad = ipad + ss;
+       struct hmac_ctx *ctx = align_ptr(opad + ss,
+                                        crypto_tfm_ctx_alignment());
+       struct crypto_shash *hash = ctx->hash;
+       struct {
+               struct shash_desc shash;
+               char ctx[crypto_shash_descsize(hash)];
+       } desc;
+       unsigned int i;
+
+       desc.shash.tfm = hash;
+       desc.shash.flags = crypto_shash_get_flags(parent) &
+                           CRYPTO_TFM_REQ_MAY_SLEEP;
+
+       if (keylen > bs) {
+               int err;
 
-       BUG_ON(!crypto_tfm_alg_blocksize(tfm));
-       
-       tfm->crt_digest.dit_hmac_block = kmalloc(crypto_tfm_alg_blocksize(tfm),
-                                                GFP_KERNEL);
-       if (tfm->crt_digest.dit_hmac_block == NULL)
-               ret = -ENOMEM;
+               err = crypto_shash_digest(&desc.shash, inkey, keylen, ipad);
+               if (err)
+                       return err;
 
-       return ret;
-               
+               keylen = ds;
+       } else
+               memcpy(ipad, inkey, keylen);
+
+       memset(ipad + keylen, 0, bs - keylen);
+       memcpy(opad, ipad, bs);
+
+       for (i = 0; i < bs; i++) {
+               ipad[i] ^= 0x36;
+               opad[i] ^= 0x5c;
+       }
+
+       return crypto_shash_init(&desc.shash) ?:
+              crypto_shash_update(&desc.shash, ipad, bs) ?:
+              crypto_shash_export(&desc.shash, ipad) ?:
+              crypto_shash_init(&desc.shash) ?:
+              crypto_shash_update(&desc.shash, opad, bs) ?:
+              crypto_shash_export(&desc.shash, opad);
 }
 
-void crypto_free_hmac_block(struct crypto_tfm *tfm)
+static int hmac_export(struct shash_desc *pdesc, void *out)
 {
-       kfree(tfm->crt_digest.dit_hmac_block);
+       struct shash_desc *desc = shash_desc_ctx(pdesc);
+
+       desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
+
+       return crypto_shash_export(desc, out);
 }
 
-void crypto_hmac_init(struct crypto_tfm *tfm, u8 *key, unsigned int *keylen)
+static int hmac_import(struct shash_desc *pdesc, const void *in)
 {
-       unsigned int i;
-       struct scatterlist tmp;
-       char *ipad = tfm->crt_digest.dit_hmac_block;
-       
-       if (*keylen > crypto_tfm_alg_blocksize(tfm)) {
-               hash_key(tfm, key, *keylen);
-               *keylen = crypto_tfm_alg_digestsize(tfm);
-       }
+       struct shash_desc *desc = shash_desc_ctx(pdesc);
+       struct hmac_ctx *ctx = hmac_ctx(pdesc->tfm);
 
-       memset(ipad, 0, crypto_tfm_alg_blocksize(tfm));
-       memcpy(ipad, key, *keylen);
+       desc->tfm = ctx->hash;
+       desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
 
-       for (i = 0; i < crypto_tfm_alg_blocksize(tfm); i++)
-               ipad[i] ^= 0x36;
+       return crypto_shash_import(desc, in);
+}
 
-       sg_set_buf(&tmp, ipad, crypto_tfm_alg_blocksize(tfm));
-       
-       crypto_digest_init(tfm);
-       crypto_digest_update(tfm, &tmp, 1);
+static int hmac_init(struct shash_desc *pdesc)
+{
+       return hmac_import(pdesc, crypto_shash_ctx_aligned(pdesc->tfm));
 }
 
-void crypto_hmac_update(struct crypto_tfm *tfm,
-                        struct scatterlist *sg, unsigned int nsg)
+static int hmac_update(struct shash_desc *pdesc,
+                      const u8 *data, unsigned int nbytes)
 {
-       crypto_digest_update(tfm, sg, nsg);
+       struct shash_desc *desc = shash_desc_ctx(pdesc);
+
+       desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
+
+       return crypto_shash_update(desc, data, nbytes);
 }
 
-void crypto_hmac_final(struct crypto_tfm *tfm, u8 *key,
-                       unsigned int *keylen, u8 *out)
+static int hmac_final(struct shash_desc *pdesc, u8 *out)
 {
-       unsigned int i;
-       struct scatterlist tmp;
-       char *opad = tfm->crt_digest.dit_hmac_block;
-       
-       if (*keylen > crypto_tfm_alg_blocksize(tfm)) {
-               hash_key(tfm, key, *keylen);
-               *keylen = crypto_tfm_alg_digestsize(tfm);
-       }
+       struct crypto_shash *parent = pdesc->tfm;
+       int ds = crypto_shash_digestsize(parent);
+       int ss = crypto_shash_statesize(parent);
+       char *opad = crypto_shash_ctx_aligned(parent) + ss;
+       struct shash_desc *desc = shash_desc_ctx(pdesc);
 
-       crypto_digest_final(tfm, out);
+       desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
 
-       memset(opad, 0, crypto_tfm_alg_blocksize(tfm));
-       memcpy(opad, key, *keylen);
-               
-       for (i = 0; i < crypto_tfm_alg_blocksize(tfm); i++)
-               opad[i] ^= 0x5c;
+       return crypto_shash_final(desc, out) ?:
+              crypto_shash_import(desc, opad) ?:
+              crypto_shash_finup(desc, out, ds, out);
+}
+
+static int hmac_finup(struct shash_desc *pdesc, const u8 *data,
+                     unsigned int nbytes, u8 *out)
+{
+
+       struct crypto_shash *parent = pdesc->tfm;
+       int ds = crypto_shash_digestsize(parent);
+       int ss = crypto_shash_statesize(parent);
+       char *opad = crypto_shash_ctx_aligned(parent) + ss;
+       struct shash_desc *desc = shash_desc_ctx(pdesc);
 
-       sg_set_buf(&tmp, opad, crypto_tfm_alg_blocksize(tfm));
+       desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
 
-       crypto_digest_init(tfm);
-       crypto_digest_update(tfm, &tmp, 1);
-       
-       sg_set_buf(&tmp, out, crypto_tfm_alg_digestsize(tfm));
-       
-       crypto_digest_update(tfm, &tmp, 1);
-       crypto_digest_final(tfm, out);
+       return crypto_shash_finup(desc, data, nbytes, out) ?:
+              crypto_shash_import(desc, opad) ?:
+              crypto_shash_finup(desc, out, ds, out);
+}
+
+static int hmac_init_tfm(struct crypto_tfm *tfm)
+{
+       struct crypto_shash *parent = __crypto_shash_cast(tfm);
+       struct crypto_shash *hash;
+       struct crypto_instance *inst = (void *)tfm->__crt_alg;
+       struct crypto_shash_spawn *spawn = crypto_instance_ctx(inst);
+       struct hmac_ctx *ctx = hmac_ctx(parent);
+
+       hash = crypto_spawn_shash(spawn);
+       if (IS_ERR(hash))
+               return PTR_ERR(hash);
+
+       parent->descsize = sizeof(struct shash_desc) +
+                          crypto_shash_descsize(hash);
+
+       ctx->hash = hash;
+       return 0;
+}
+
+static void hmac_exit_tfm(struct crypto_tfm *tfm)
+{
+       struct hmac_ctx *ctx = hmac_ctx(__crypto_shash_cast(tfm));
+       crypto_free_shash(ctx->hash);
+}
+
+static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb)
+{
+       struct shash_instance *inst;
+       struct crypto_alg *alg;
+       struct shash_alg *salg;
+       int err;
+       int ds;
+       int ss;
+
+       err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH);
+       if (err)
+               return err;
+
+       salg = shash_attr_alg(tb[1], 0, 0);
+       if (IS_ERR(salg))
+               return PTR_ERR(salg);
+
+       err = -EINVAL;
+       ds = salg->digestsize;
+       ss = salg->statesize;
+       alg = &salg->base;
+       if (ds > alg->cra_blocksize ||
+           ss < alg->cra_blocksize)
+               goto out_put_alg;
+
+       inst = shash_alloc_instance("hmac", alg);
+       err = PTR_ERR(inst);
+       if (IS_ERR(inst))
+               goto out_put_alg;
+
+       err = crypto_init_shash_spawn(shash_instance_ctx(inst), salg,
+                                     shash_crypto_instance(inst));
+       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;
+
+       ss = ALIGN(ss, alg->cra_alignmask + 1);
+       inst->alg.digestsize = ds;
+       inst->alg.statesize = ss;
+
+       inst->alg.base.cra_ctxsize = sizeof(struct hmac_ctx) +
+                                    ALIGN(ss * 2, crypto_tfm_ctx_alignment());
+
+       inst->alg.base.cra_init = hmac_init_tfm;
+       inst->alg.base.cra_exit = hmac_exit_tfm;
+
+       inst->alg.init = hmac_init;
+       inst->alg.update = hmac_update;
+       inst->alg.final = hmac_final;
+       inst->alg.finup = hmac_finup;
+       inst->alg.export = hmac_export;
+       inst->alg.import = hmac_import;
+       inst->alg.setkey = hmac_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 err;
+}
+
+static struct crypto_template hmac_tmpl = {
+       .name = "hmac",
+       .create = hmac_create,
+       .free = shash_free_instance,
+       .module = THIS_MODULE,
+};
+
+static int __init hmac_module_init(void)
+{
+       return crypto_register_template(&hmac_tmpl);
 }
 
-void crypto_hmac(struct crypto_tfm *tfm, u8 *key, unsigned int *keylen,
-                 struct scatterlist *sg, unsigned int nsg, u8 *out)
+static void __exit hmac_module_exit(void)
 {
-       crypto_hmac_init(tfm, key, keylen);
-       crypto_hmac_update(tfm, sg, nsg);
-       crypto_hmac_final(tfm, key, keylen, out);
+       crypto_unregister_template(&hmac_tmpl);
 }
 
-EXPORT_SYMBOL_GPL(crypto_hmac_init);
-EXPORT_SYMBOL_GPL(crypto_hmac_update);
-EXPORT_SYMBOL_GPL(crypto_hmac_final);
-EXPORT_SYMBOL_GPL(crypto_hmac);
+module_init(hmac_module_init);
+module_exit(hmac_module_exit);
 
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("HMAC hash algorithm");