*
*/
-#include <crypto/algapi.h>
+#include <crypto/internal/hash.h>
+#include <crypto/scatterwalk.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
struct hmac_ctx {
- struct crypto_hash *child;
+ struct crypto_shash *hash;
};
-static void hash_key(struct crypto_tfm *tfm, u8 *key, unsigned int keylen)
-{
- struct scatterlist tmp;
-
- sg_set_buf(&tmp, key, keylen);
- crypto_digest_digest(tfm, &tmp, 1, key);
-}
-
-int crypto_alloc_hmac_block(struct crypto_tfm *tfm)
-{
- int ret = 0;
-
- 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;
-
- return ret;
-
-}
-
-void crypto_free_hmac_block(struct crypto_tfm *tfm)
-{
- kfree(tfm->crt_hash.hmac_block);
-}
-
-void crypto_hmac_init(struct crypto_tfm *tfm, u8 *key, unsigned int *keylen)
-{
- 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);
- }
-
- memset(ipad, 0, crypto_tfm_alg_blocksize(tfm));
- memcpy(ipad, key, *keylen);
-
- for (i = 0; i < crypto_tfm_alg_blocksize(tfm); i++)
- ipad[i] ^= 0x36;
-
- sg_set_buf(&tmp, ipad, crypto_tfm_alg_blocksize(tfm));
-
- crypto_digest_init(tfm);
- crypto_digest_update(tfm, &tmp, 1);
-}
-
-void crypto_hmac_update(struct crypto_tfm *tfm,
- struct scatterlist *sg, unsigned int nsg)
-{
- crypto_digest_update(tfm, sg, nsg);
-}
-
-void crypto_hmac_final(struct crypto_tfm *tfm, u8 *key,
- unsigned int *keylen, 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);
- }
-
- crypto_digest_final(tfm, out);
-
- 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;
-
- sg_set_buf(&tmp, opad, crypto_tfm_alg_blocksize(tfm));
-
- 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);
-}
-
-void crypto_hmac(struct crypto_tfm *tfm, u8 *key, unsigned int *keylen,
- struct scatterlist *sg, unsigned int nsg, u8 *out)
-{
- crypto_hmac_init(tfm, key, keylen);
- crypto_hmac_update(tfm, sg, nsg);
- crypto_hmac_final(tfm, key, keylen, out);
-}
-
-EXPORT_SYMBOL_GPL(crypto_hmac_init);
-EXPORT_SYMBOL_GPL(crypto_hmac_update);
-EXPORT_SYMBOL_GPL(crypto_hmac_final);
-EXPORT_SYMBOL_GPL(crypto_hmac);
-
static inline void *align_ptr(void *p, unsigned int align)
{
return (void *)ALIGN((unsigned long)p, align);
}
-static inline struct hmac_ctx *hmac_ctx(struct crypto_hash *tfm)
+static inline struct hmac_ctx *hmac_ctx(struct crypto_shash *tfm)
{
- return align_ptr(crypto_hash_ctx_aligned(tfm) +
- crypto_hash_blocksize(tfm) * 2 +
- crypto_hash_digestsize(tfm), sizeof(void *));
+ return align_ptr(crypto_shash_ctx_aligned(tfm) +
+ crypto_shash_statesize(tfm) * 2,
+ crypto_tfm_ctx_alignment());
}
-static int hmac_setkey(struct crypto_hash *parent,
+static int hmac_setkey(struct crypto_shash *parent,
const u8 *inkey, unsigned int keylen)
{
- int bs = crypto_hash_blocksize(parent);
- int ds = crypto_hash_digestsize(parent);
- char *ipad = crypto_hash_ctx_aligned(parent);
- char *opad = ipad + bs;
- char *digest = opad + bs;
- struct hmac_ctx *ctx = align_ptr(digest + ds, sizeof(void *));
- struct crypto_hash *tfm = ctx->child;
+ 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) {
- struct hash_desc desc;
- struct scatterlist tmp;
int err;
- desc.tfm = tfm;
- desc.flags = crypto_hash_get_flags(parent);
- desc.flags &= CRYPTO_TFM_REQ_MAY_SLEEP;
- sg_set_buf(&tmp, inkey, keylen);
-
- err = crypto_hash_digest(&desc, &tmp, keylen, digest);
+ err = crypto_shash_digest(&desc.shash, inkey, keylen, ipad);
if (err)
return err;
- inkey = digest;
keylen = ds;
- }
+ } else
+ memcpy(ipad, inkey, keylen);
- memcpy(ipad, inkey, keylen);
memset(ipad + keylen, 0, bs - keylen);
memcpy(opad, ipad, bs);
opad[i] ^= 0x5c;
}
- return 0;
+ 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);
}
-static int hmac_init(struct hash_desc *pdesc)
+static int hmac_export(struct shash_desc *pdesc, void *out)
{
- struct crypto_hash *parent = pdesc->tfm;
- int bs = crypto_hash_blocksize(parent);
- int ds = crypto_hash_digestsize(parent);
- char *ipad = crypto_hash_ctx_aligned(parent);
- struct hmac_ctx *ctx = align_ptr(ipad + bs * 2 + ds, sizeof(void *));
- struct hash_desc desc;
- struct scatterlist tmp;
-
- desc.tfm = ctx->child;
- desc.flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
- sg_set_buf(&tmp, ipad, bs);
-
- return unlikely(crypto_hash_init(&desc)) ?:
- crypto_hash_update(&desc, &tmp, 1);
+ struct shash_desc *desc = shash_desc_ctx(pdesc);
+
+ desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
+
+ return crypto_shash_export(desc, out);
}
-static int hmac_update(struct hash_desc *pdesc,
- struct scatterlist *sg, unsigned int nbytes)
+static int hmac_import(struct shash_desc *pdesc, const void *in)
{
+ struct shash_desc *desc = shash_desc_ctx(pdesc);
struct hmac_ctx *ctx = hmac_ctx(pdesc->tfm);
- struct hash_desc desc;
- desc.tfm = ctx->child;
- desc.flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
+ desc->tfm = ctx->hash;
+ desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
- return crypto_hash_update(&desc, sg, nbytes);
+ return crypto_shash_import(desc, in);
}
-static int hmac_final(struct hash_desc *pdesc, u8 *out)
+static int hmac_init(struct shash_desc *pdesc)
{
- struct crypto_hash *parent = pdesc->tfm;
- int bs = crypto_hash_blocksize(parent);
- int ds = crypto_hash_digestsize(parent);
- char *opad = crypto_hash_ctx_aligned(parent) + bs;
- char *digest = opad + bs;
- struct hmac_ctx *ctx = align_ptr(digest + ds, sizeof(void *));
- struct hash_desc desc;
- struct scatterlist tmp;
-
- desc.tfm = ctx->child;
- desc.flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
- sg_set_buf(&tmp, opad, bs + ds);
-
- return unlikely(crypto_hash_final(&desc, digest)) ?:
- crypto_hash_digest(&desc, &tmp, bs + ds, out);
+ return hmac_import(pdesc, crypto_shash_ctx_aligned(pdesc->tfm));
}
-static int hmac_digest(struct hash_desc *pdesc, struct scatterlist *sg,
- unsigned int nbytes, u8 *out)
+static int hmac_update(struct shash_desc *pdesc,
+ const u8 *data, unsigned int nbytes)
{
- struct crypto_hash *parent = pdesc->tfm;
- int bs = crypto_hash_blocksize(parent);
- int ds = crypto_hash_digestsize(parent);
- char *ipad = crypto_hash_ctx_aligned(parent);
- char *opad = ipad + bs;
- char *digest = opad + bs;
- struct hmac_ctx *ctx = align_ptr(digest + ds, sizeof(void *));
- struct hash_desc desc;
- struct scatterlist sg1[2];
- struct scatterlist sg2[1];
-
- desc.tfm = ctx->child;
- desc.flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
-
- sg_set_buf(sg1, ipad, bs);
- sg1[1].page = (void *)sg;
- sg1[1].length = 0;
- sg_set_buf(sg2, opad, bs + ds);
-
- return unlikely(crypto_hash_digest(&desc, sg1, nbytes + bs, digest)) ?:
- crypto_hash_digest(&desc, sg2, bs + ds, out);
+ struct shash_desc *desc = shash_desc_ctx(pdesc);
+
+ desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
+
+ return crypto_shash_update(desc, data, nbytes);
+}
+
+static int hmac_final(struct shash_desc *pdesc, 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);
+
+ desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
+
+ 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);
+
+ 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_spawn *spawn = crypto_instance_ctx(inst);
- struct hmac_ctx *ctx = hmac_ctx(__crypto_hash_cast(tfm));
+ 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);
- tfm = crypto_spawn_tfm(spawn);
- if (IS_ERR(tfm))
- return PTR_ERR(tfm);
+ parent->descsize = sizeof(struct shash_desc) +
+ crypto_shash_descsize(hash);
- ctx->child = crypto_hash_cast(tfm);
+ ctx->hash = hash;
return 0;
}
static void hmac_exit_tfm(struct crypto_tfm *tfm)
{
- struct hmac_ctx *ctx = hmac_ctx(__crypto_hash_cast(tfm));
- crypto_free_hash(ctx->child);
-}
-
-static void hmac_free(struct crypto_instance *inst)
-{
- crypto_drop_spawn(crypto_instance_ctx(inst));
- kfree(inst);
+ struct hmac_ctx *ctx = hmac_ctx(__crypto_shash_cast(tfm));
+ crypto_free_shash(ctx->hash);
}
-static struct crypto_instance *hmac_alloc(void *param, unsigned int len)
+static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb)
{
- struct crypto_instance *inst;
+ 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;
- alg = crypto_get_attr_alg(param, len, CRYPTO_ALG_TYPE_HASH,
- CRYPTO_ALG_TYPE_HASH_MASK | CRYPTO_ALG_ASYNC);
- if (IS_ERR(alg))
- return ERR_PTR(PTR_ERR(alg));
-
- inst = crypto_alloc_instance("hmac", alg);
+ inst = shash_alloc_instance("hmac", alg);
+ err = PTR_ERR(inst);
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_flags & CRYPTO_ALG_TYPE_MASK) ==
- CRYPTO_ALG_TYPE_HASH ? alg->cra_hash.digestsize :
- alg->cra_digest.dia_digestsize;
-
- inst->alg.cra_ctxsize = sizeof(struct hmac_ctx) +
- ALIGN(inst->alg.cra_blocksize * 2 +
- inst->alg.cra_hash.digestsize,
- sizeof(void *));
-
- inst->alg.cra_init = hmac_init_tfm;
- inst->alg.cra_exit = hmac_exit_tfm;
-
- inst->alg.cra_hash.init = hmac_init;
- inst->alg.cra_hash.update = hmac_update;
- inst->alg.cra_hash.final = hmac_final;
- inst->alg.cra_hash.digest = hmac_digest;
- inst->alg.cra_hash.setkey = hmac_setkey;
+ 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 inst;
+ return err;
}
static struct crypto_template hmac_tmpl = {
.name = "hmac",
- .alloc = hmac_alloc,
- .free = hmac_free,
+ .create = hmac_create,
+ .free = shash_free_instance,
.module = THIS_MODULE,
};