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crypto: xcbc - Switch to shash

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This patch converts the xcbc algorithm to the new shash type.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2009-07-12 12:48:32 +08:00
parent 8bd1209cff
commit 3106caab61
1 changed files with 79 additions and 140 deletions
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173
crypto/xcbc.c
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@ -19,15 +19,9 @@
* Kazunori Miyazawa <miyazawa@linux-ipv6.org> * Kazunori Miyazawa <miyazawa@linux-ipv6.org>
*/ */
#include <crypto/scatterwalk.h> #include <crypto/internal/hash.h>
#include <linux/crypto.h>
#include <linux/err.h> #include <linux/err.h>
#include <linux/hardirq.h>
#include <linux/kernel.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, static u_int32_t ks[12] = {0x01010101, 0x01010101, 0x01010101, 0x01010101,
0x02020202, 0x02020202, 0x02020202, 0x02020202, 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]; ((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) struct crypto_xcbc_ctx *ctx)
{ {
int bs = crypto_hash_blocksize(parent); int bs = crypto_shash_blocksize(parent);
int err = 0; int err = 0;
u8 key1[bs]; 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); 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) 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)) if (keylen != crypto_cipher_blocksize(ctx->child))
return -EINVAL; return -EINVAL;
@ -96,10 +90,10 @@ static int crypto_xcbc_digest_setkey(struct crypto_hash *parent,
return _crypto_xcbc_digest_setkey(parent, ctx); 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); struct crypto_xcbc_ctx *ctx = crypto_shash_ctx(pdesc->tfm);
int bs = crypto_hash_blocksize(pdesc->tfm); int bs = crypto_shash_blocksize(pdesc->tfm);
ctx->len = 0; ctx->len = 0;
memset(ctx->odds, 0, bs); memset(ctx->odds, 0, bs);
@ -108,45 +102,19 @@ static int crypto_xcbc_digest_init(struct hash_desc *pdesc)
return 0; return 0;
} }
static int crypto_xcbc_digest_update2(struct hash_desc *pdesc, static int crypto_xcbc_digest_update(struct shash_desc *pdesc, const u8 *p,
struct scatterlist *sg, unsigned int len)
unsigned int nbytes)
{ {
struct crypto_hash *parent = pdesc->tfm; struct crypto_shash *parent = pdesc->tfm;
struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(parent); struct crypto_xcbc_ctx *ctx = crypto_shash_ctx(parent);
struct crypto_cipher *tfm = ctx->child; struct crypto_cipher *tfm = ctx->child;
int bs = crypto_hash_blocksize(parent); int bs = crypto_shash_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 */ /* checking the data can fill the block */
if ((ctx->len + len) <= bs) { if ((ctx->len + len) <= bs) {
memcpy(ctx->odds + ctx->len, p, len); memcpy(ctx->odds + ctx->len, p, len);
ctx->len += len; ctx->len += len;
slen -= len; return 0;
/* 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 */ /* filling odds with new data and encrypting it */
@ -163,8 +131,7 @@ static int crypto_xcbc_digest_update2(struct hash_desc *pdesc,
/* encrypting the rest of data */ /* encrypting the rest of data */
while (len > bs) { while (len > bs) {
ctx->xor(ctx->prev, p, bs); ctx->xor(ctx->prev, p, bs);
crypto_cipher_encrypt_one(tfm, ctx->prev, crypto_cipher_encrypt_one(tfm, ctx->prev, ctx->prev);
ctx->prev);
p += bs; p += bs;
len -= bs; len -= bs;
} }
@ -174,36 +141,16 @@ static int crypto_xcbc_digest_update2(struct hash_desc *pdesc,
memcpy(ctx->odds, p, len); memcpy(ctx->odds, p, len);
ctx->len = 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);
}
return 0; return 0;
} }
static int crypto_xcbc_digest_update(struct hash_desc *pdesc, static int crypto_xcbc_digest_final(struct shash_desc *pdesc, u8 *out)
struct scatterlist *sg,
unsigned int nbytes)
{ {
if (WARN_ON_ONCE(in_irq())) struct crypto_shash *parent = pdesc->tfm;
return -EDEADLK; struct crypto_xcbc_ctx *ctx = crypto_shash_ctx(parent);
return crypto_xcbc_digest_update2(pdesc, sg, nbytes);
}
static int crypto_xcbc_digest_final(struct hash_desc *pdesc, u8 *out)
{
struct crypto_hash *parent = pdesc->tfm;
struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(parent);
struct crypto_cipher *tfm = ctx->child; struct crypto_cipher *tfm = ctx->child;
int bs = crypto_hash_blocksize(parent); int bs = crypto_shash_blocksize(parent);
int err = 0; int err = 0;
if (ctx->len == bs) { if (ctx->len == bs) {
@ -248,24 +195,13 @@ static int crypto_xcbc_digest_final(struct hash_desc *pdesc, u8 *out)
return 0; 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) static int xcbc_init_tfm(struct crypto_tfm *tfm)
{ {
struct crypto_cipher *cipher; struct crypto_cipher *cipher;
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_spawn *spawn = crypto_instance_ctx(inst);
struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(__crypto_hash_cast(tfm)); struct crypto_xcbc_ctx *ctx = crypto_tfm_ctx(tfm);
int bs = crypto_hash_blocksize(__crypto_hash_cast(tfm)); int bs = crypto_tfm_alg_blocksize(tfm);
cipher = crypto_spawn_cipher(spawn); cipher = crypto_spawn_cipher(spawn);
if (IS_ERR(cipher)) 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) 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); 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; struct crypto_alg *alg;
int err; int err;
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_CIPHER, alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
CRYPTO_ALG_TYPE_MASK); CRYPTO_ALG_TYPE_MASK);
if (IS_ERR(alg)) if (IS_ERR(alg))
return ERR_CAST(alg); return PTR_ERR(alg);
switch(alg->cra_blocksize) { switch(alg->cra_blocksize) {
case 16: case 16:
break; break;
default: default:
inst = ERR_PTR(-EINVAL);
goto out_put_alg; goto out_put_alg;
} }
inst = crypto_alloc_instance("xcbc", alg); inst = shash_alloc_instance("xcbc", 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_spawn(shash_instance_ctx(inst), alg,
inst->alg.cra_priority = alg->cra_priority; shash_crypto_instance(inst),
inst->alg.cra_blocksize = alg->cra_blocksize; CRYPTO_ALG_TYPE_MASK);
inst->alg.cra_alignmask = alg->cra_alignmask; if (err)
inst->alg.cra_type = &crypto_hash_type; goto out_free_inst;
inst->alg.cra_hash.digestsize = alg->cra_blocksize; inst->alg.base.cra_priority = alg->cra_priority;
inst->alg.cra_ctxsize = sizeof(struct crypto_xcbc_ctx) + inst->alg.base.cra_blocksize = alg->cra_blocksize;
ALIGN(inst->alg.cra_blocksize * 3, sizeof(void *)); inst->alg.base.cra_alignmask = alg->cra_alignmask;
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.digestsize = alg->cra_blocksize;
inst->alg.cra_hash.update = crypto_xcbc_digest_update; inst->alg.base.cra_ctxsize = sizeof(struct crypto_xcbc_ctx) +
inst->alg.cra_hash.final = crypto_xcbc_digest_final; ALIGN(alg->cra_blocksize * 3,
inst->alg.cra_hash.digest = crypto_xcbc_digest; sizeof(void *));
inst->alg.cra_hash.setkey = crypto_xcbc_digest_setkey; 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: out_put_alg:
crypto_mod_put(alg); crypto_mod_put(alg);
return inst; return err;
}
static void xcbc_free(struct crypto_instance *inst)
{
crypto_drop_spawn(crypto_instance_ctx(inst));
kfree(inst);
} }
static struct crypto_template crypto_xcbc_tmpl = { static struct crypto_template crypto_xcbc_tmpl = {
.name = "xcbc", .name = "xcbc",
.alloc = xcbc_alloc, .create = xcbc_create,
.free = xcbc_free, .free = shash_free_instance,
.module = THIS_MODULE, .module = THIS_MODULE,
}; };