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crypto: hmac - Switch to shash 

This patch changes hmac to the new shash interface.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2009-07-09 12:43:37 +08:00
parent bbbee4679a
commit 8bd1209cff
1 changed files with 110 additions and 153 deletions
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263
crypto/hmac.c
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@ -27,7 +27,7 @@
#include <linux/string.h> #include <linux/string.h>
struct hmac_ctx { struct hmac_ctx {
struct crypto_hash *child; struct shash_desc *desc;
}; };
static inline void *align_ptr(void *p, unsigned int align) static inline void *align_ptr(void *p, unsigned int align)
@ -35,57 +35,33 @@ static inline void *align_ptr(void *p, unsigned int align)
return (void *)ALIGN((unsigned long)p, 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) + return align_ptr(crypto_shash_ctx_aligned(tfm) +
crypto_hash_blocksize(tfm) * 2 + crypto_shash_blocksize(tfm) * 2 +
crypto_hash_digestsize(tfm), sizeof(void *)); crypto_shash_digestsize(tfm),
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) const u8 *inkey, unsigned int keylen)
{ {
int bs = crypto_hash_blocksize(parent); int bs = crypto_shash_blocksize(parent);
int ds = crypto_hash_digestsize(parent); int ds = crypto_shash_digestsize(parent);
char *ipad = crypto_hash_ctx_aligned(parent); char *ipad = crypto_shash_ctx_aligned(parent);
char *opad = ipad + bs; char *opad = ipad + bs;
char *digest = opad + bs; char *digest = opad + bs;
struct hmac_ctx *ctx = align_ptr(digest + ds, sizeof(void *)); struct hmac_ctx *ctx = align_ptr(digest + ds,
struct crypto_hash *tfm = ctx->child; crypto_tfm_ctx_alignment());
unsigned int i; unsigned int i;
if (keylen > bs) { if (keylen > bs) {
struct hash_desc desc;
struct scatterlist tmp;
int tmplen;
int err; int err;
desc.tfm = tfm; ctx->desc->flags = crypto_shash_get_flags(parent) &
desc.flags = crypto_hash_get_flags(parent); CRYPTO_TFM_REQ_MAY_SLEEP;
desc.flags &= CRYPTO_TFM_REQ_MAY_SLEEP;
err = crypto_hash_init(&desc); err = crypto_shash_digest(ctx->desc, inkey, keylen, digest);
if (err)
return err;
tmplen = bs * 2 + ds;
sg_init_one(&tmp, ipad, tmplen);
for (; keylen > tmplen; inkey += tmplen, keylen -= tmplen) {
memcpy(ipad, inkey, tmplen);
err = crypto_hash_update(&desc, &tmp, tmplen);
if (err)
return err;
}
if (keylen) {
memcpy(ipad, inkey, keylen);
err = crypto_hash_update(&desc, &tmp, keylen);
if (err)
return err;
}
err = crypto_hash_final(&desc, digest);
if (err) if (err)
return err; return err;
@ -105,181 +81,162 @@ static int hmac_setkey(struct crypto_hash *parent,
return 0; return 0;
} }
static int hmac_init(struct hash_desc *pdesc) static int hmac_init(struct shash_desc *pdesc)
{ {
struct crypto_hash *parent = pdesc->tfm; struct crypto_shash *parent = pdesc->tfm;
int bs = crypto_hash_blocksize(parent); int bs = crypto_shash_blocksize(parent);
int ds = crypto_hash_digestsize(parent); int ds = crypto_shash_digestsize(parent);
char *ipad = crypto_hash_ctx_aligned(parent); char *ipad = crypto_shash_ctx_aligned(parent);
struct hmac_ctx *ctx = align_ptr(ipad + bs * 2 + ds, sizeof(void *)); struct hmac_ctx *ctx = align_ptr(ipad + bs * 2 + ds,
struct hash_desc desc; crypto_tfm_ctx_alignment());
struct scatterlist tmp; struct shash_desc *desc = shash_desc_ctx(pdesc);
int err;
desc.tfm = ctx->child; desc->tfm = ctx->desc->tfm;
desc.flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP; desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
sg_init_one(&tmp, ipad, bs);
err = crypto_hash_init(&desc); return crypto_shash_init(desc) ?:
if (unlikely(err)) crypto_shash_update(desc, ipad, bs);
return err;
return crypto_hash_update(&desc, &tmp, bs);
} }
static int hmac_update(struct hash_desc *pdesc, static int hmac_update(struct shash_desc *pdesc,
struct scatterlist *sg, unsigned int nbytes) const u8 *data, unsigned int nbytes)
{ {
struct hmac_ctx *ctx = hmac_ctx(pdesc->tfm); struct shash_desc *desc = shash_desc_ctx(pdesc);
struct hash_desc desc;
desc.tfm = ctx->child; desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
desc.flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
return crypto_hash_update(&desc, sg, nbytes); return crypto_shash_update(desc, data, nbytes);
} }
static int hmac_final(struct hash_desc *pdesc, u8 *out) static int hmac_final(struct shash_desc *pdesc, u8 *out)
{ {
struct crypto_hash *parent = pdesc->tfm; struct crypto_shash *parent = pdesc->tfm;
int bs = crypto_hash_blocksize(parent); int bs = crypto_shash_blocksize(parent);
int ds = crypto_hash_digestsize(parent); int ds = crypto_shash_digestsize(parent);
char *opad = crypto_hash_ctx_aligned(parent) + bs; char *opad = crypto_shash_ctx_aligned(parent) + bs;
char *digest = opad + bs; char *digest = opad + bs;
struct hmac_ctx *ctx = align_ptr(digest + ds, sizeof(void *)); struct shash_desc *desc = shash_desc_ctx(pdesc);
struct hash_desc desc;
struct scatterlist tmp;
int err;
desc.tfm = ctx->child; desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
desc.flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
sg_init_one(&tmp, opad, bs + ds);
err = crypto_hash_final(&desc, digest); return crypto_shash_final(desc, digest) ?:
if (unlikely(err)) crypto_shash_digest(desc, opad, bs + ds, out);
return err;
return crypto_hash_digest(&desc, &tmp, bs + ds, out);
} }
static int hmac_digest(struct hash_desc *pdesc, struct scatterlist *sg, static int hmac_finup(struct shash_desc *pdesc, const u8 *data,
unsigned int nbytes, u8 *out) unsigned int nbytes, u8 *out)
{ {
struct crypto_hash *parent = pdesc->tfm;
int bs = crypto_hash_blocksize(parent); struct crypto_shash *parent = pdesc->tfm;
int ds = crypto_hash_digestsize(parent); int bs = crypto_shash_blocksize(parent);
char *ipad = crypto_hash_ctx_aligned(parent); int ds = crypto_shash_digestsize(parent);
char *opad = ipad + bs; char *opad = crypto_shash_ctx_aligned(parent) + bs;
char *digest = opad + bs; char *digest = opad + bs;
struct hmac_ctx *ctx = align_ptr(digest + ds, sizeof(void *)); struct shash_desc *desc = shash_desc_ctx(pdesc);
struct hash_desc desc;
struct scatterlist sg1[2];
struct scatterlist sg2[1];
int err;
desc.tfm = ctx->child; desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
desc.flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
sg_init_table(sg1, 2); return crypto_shash_finup(desc, data, nbytes, digest) ?:
sg_set_buf(sg1, ipad, bs); crypto_shash_digest(desc, opad, bs + ds, out);
scatterwalk_sg_chain(sg1, 2, sg);
sg_init_table(sg2, 1);
sg_set_buf(sg2, opad, bs + ds);
err = crypto_hash_digest(&desc, sg1, nbytes + bs, digest);
if (unlikely(err))
return err;
return crypto_hash_digest(&desc, sg2, bs + ds, out);
} }
static int hmac_init_tfm(struct crypto_tfm *tfm) static int hmac_init_tfm(struct crypto_tfm *tfm)
{ {
struct crypto_hash *hash; struct crypto_shash *parent = __crypto_shash_cast(tfm);
struct crypto_shash *hash;
struct crypto_instance *inst = (void *)tfm->__crt_alg; struct crypto_instance *inst = (void *)tfm->__crt_alg;
struct crypto_spawn *spawn = crypto_instance_ctx(inst); struct crypto_shash_spawn *spawn = crypto_instance_ctx(inst);
struct hmac_ctx *ctx = hmac_ctx(__crypto_hash_cast(tfm)); struct hmac_ctx *ctx = hmac_ctx(parent);
hash = crypto_spawn_hash(spawn); hash = crypto_spawn_shash(spawn);
if (IS_ERR(hash)) if (IS_ERR(hash))
return PTR_ERR(hash); return PTR_ERR(hash);
ctx->child = hash; parent->descsize = sizeof(struct shash_desc) +
crypto_shash_descsize(hash);
ctx->desc = kmalloc(parent->descsize, GFP_KERNEL);
if (!ctx->desc) {
crypto_free_shash(hash);
return -ENOMEM;
}
ctx->desc->tfm = hash;
return 0; return 0;
} }
static void hmac_exit_tfm(struct crypto_tfm *tfm) static void hmac_exit_tfm(struct crypto_tfm *tfm)
{ {
struct hmac_ctx *ctx = hmac_ctx(__crypto_hash_cast(tfm)); struct hmac_ctx *ctx = hmac_ctx(__crypto_shash_cast(tfm));
crypto_free_hash(ctx->child); crypto_free_shash(ctx->desc->tfm);
kzfree(ctx->desc);
} }
static void hmac_free(struct crypto_instance *inst) static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb)
{ {
crypto_drop_spawn(crypto_instance_ctx(inst)); struct shash_instance *inst;
kfree(inst);
}
static struct crypto_instance *hmac_alloc(struct rtattr **tb)
{
struct crypto_instance *inst;
struct crypto_alg *alg; struct crypto_alg *alg;
struct shash_alg *salg;
int err; int err;
int ds; int ds;
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_HASH); err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH);
if (err) if (err)
return ERR_PTR(err); return err;
alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_HASH, salg = shash_attr_alg(tb[1], 0, 0);
CRYPTO_ALG_TYPE_HASH_MASK); if (IS_ERR(salg))
if (IS_ERR(alg)) return PTR_ERR(salg);
return ERR_CAST(alg);
inst = ERR_PTR(-EINVAL); err = -EINVAL;
ds = alg->cra_type == &crypto_hash_type ? ds = salg->digestsize;
alg->cra_hash.digestsize : alg = &salg->base;
alg->cra_type ?
__crypto_shash_alg(alg)->digestsize :
alg->cra_digest.dia_digestsize;
if (ds > alg->cra_blocksize) if (ds > alg->cra_blocksize)
goto out_put_alg; goto out_put_alg;
inst = crypto_alloc_instance("hmac", alg); inst = shash_alloc_instance("hmac", alg);
if (IS_ERR(inst)) if (IS_ERR(inst))
goto out_put_alg; goto out_put_alg;
inst->alg.cra_flags = CRYPTO_ALG_TYPE_HASH; err = crypto_init_shash_spawn(shash_instance_ctx(inst), salg,
inst->alg.cra_priority = alg->cra_priority; shash_crypto_instance(inst));
inst->alg.cra_blocksize = alg->cra_blocksize; if (err)
inst->alg.cra_alignmask = alg->cra_alignmask; goto out_free_inst;
inst->alg.cra_type = &crypto_hash_type;
inst->alg.cra_hash.digestsize = ds; 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.cra_ctxsize = sizeof(struct hmac_ctx) + inst->alg.digestsize = ds;
ALIGN(inst->alg.cra_blocksize * 2 + ds,
sizeof(void *));
inst->alg.cra_init = hmac_init_tfm; inst->alg.base.cra_ctxsize = sizeof(struct hmac_ctx) +
inst->alg.cra_exit = hmac_exit_tfm; ALIGN(alg->cra_blocksize * 2 + ds,
crypto_tfm_ctx_alignment());
inst->alg.cra_hash.init = hmac_init; inst->alg.base.cra_init = hmac_init_tfm;
inst->alg.cra_hash.update = hmac_update; inst->alg.base.cra_exit = hmac_exit_tfm;
inst->alg.cra_hash.final = hmac_final;
inst->alg.cra_hash.digest = hmac_digest; inst->alg.init = hmac_init;
inst->alg.cra_hash.setkey = hmac_setkey; inst->alg.update = hmac_update;
inst->alg.final = hmac_final;
inst->alg.finup = hmac_finup;
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: out_put_alg:
crypto_mod_put(alg); crypto_mod_put(alg);
return inst; return err;
} }
static struct crypto_template hmac_tmpl = { static struct crypto_template hmac_tmpl = {
.name = "hmac", .name = "hmac",
.alloc = hmac_alloc, .create = hmac_create,
.free = hmac_free, .free = shash_free_instance,
.module = THIS_MODULE, .module = THIS_MODULE,
}; };