* 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/slab.h>
+#include <linux/string.h>
+
+struct hmac_ctx {
+ struct crypto_shash *hash;
+};
-static void hash_key(struct crypto_tfm *tfm, u8 *key, unsigned int keylen)
+static inline void *align_ptr(void *p, unsigned int align)
{
- struct scatterlist tmp;
-
- sg_set_buf(&tmp, key, keylen);
- crypto_digest_digest(tfm, &tmp, 1, key);
+ return (void *)ALIGN((unsigned long)p, align);
}
-int crypto_alloc_hmac_block(struct crypto_tfm *tfm)
+static inline struct hmac_ctx *hmac_ctx(struct crypto_shash *tfm)
{
- int ret = 0;
+ return align_ptr(crypto_shash_ctx_aligned(tfm) +
+ crypto_shash_statesize(tfm) * 2,
+ crypto_tfm_ctx_alignment());
+}
+
+static int hmac_setkey(struct crypto_shash *parent,
+ const u8 *inkey, unsigned int keylen)
+{
+ 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;
- BUG_ON(!crypto_tfm_alg_blocksize(tfm));
-
- tfm->crt_hash.hmac_block = kmalloc(crypto_tfm_alg_blocksize(tfm),
- GFP_KERNEL);
- if (tfm->crt_hash.hmac_block == NULL)
- ret = -ENOMEM;
+ desc.shash.tfm = hash;
+ desc.shash.flags = crypto_shash_get_flags(parent) &
+ CRYPTO_TFM_REQ_MAY_SLEEP;
+
+ if (keylen > bs) {
+ int err;
+
+ err = crypto_shash_digest(&desc.shash, inkey, keylen, ipad);
+ if (err)
+ return err;
+
+ 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 ret;
-
+ 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_hash.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_hash.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_hash.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)
+{
- sg_set_buf(&tmp, opad, crypto_tfm_alg_blocksize(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_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);
+ desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
+
+ 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");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff