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-rw-r--r--crypto/xcbc.c164
1 files changed, 73 insertions, 91 deletions
diff --git a/crypto/xcbc.c b/crypto/xcbc.c
index 9d502e67a5c..1e30b31f33c 100644
--- a/crypto/xcbc.c
+++ b/crypto/xcbc.c
@@ -26,69 +26,67 @@
static u_int32_t ks[12] = {0x01010101, 0x01010101, 0x01010101, 0x01010101,
0x02020202, 0x02020202, 0x02020202, 0x02020202,
0x03030303, 0x03030303, 0x03030303, 0x03030303};
+
/*
* +------------------------
* | <parent tfm>
* +------------------------
- * | crypto_xcbc_ctx
+ * | xcbc_tfm_ctx
* +------------------------
- * | odds (block size)
+ * | consts (block size * 2)
* +------------------------
- * | prev (block size)
+ */
+struct xcbc_tfm_ctx {
+ struct crypto_cipher *child;
+ u8 ctx[];
+};
+
+/*
* +------------------------
- * | key (block size)
+ * | <shash desc>
* +------------------------
- * | consts (block size * 3)
+ * | xcbc_desc_ctx
+ * +------------------------
+ * | odds (block size)
+ * +------------------------
+ * | prev (block size)
* +------------------------
*/
-struct crypto_xcbc_ctx {
- struct crypto_cipher *child;
- u8 *odds;
- u8 *prev;
- u8 *key;
- u8 *consts;
- unsigned int keylen;
+struct xcbc_desc_ctx {
unsigned int len;
+ u8 ctx[];
};
-static int _crypto_xcbc_digest_setkey(struct crypto_shash *parent,
- struct crypto_xcbc_ctx *ctx)
+static int crypto_xcbc_digest_setkey(struct crypto_shash *parent,
+ const u8 *inkey, unsigned int keylen)
{
+ unsigned long alignmask = crypto_shash_alignmask(parent);
+ struct xcbc_tfm_ctx *ctx = crypto_shash_ctx(parent);
int bs = crypto_shash_blocksize(parent);
+ u8 *consts = PTR_ALIGN(&ctx->ctx[0], alignmask + 1);
int err = 0;
u8 key1[bs];
- if ((err = crypto_cipher_setkey(ctx->child, ctx->key, ctx->keylen)))
- return err;
+ if ((err = crypto_cipher_setkey(ctx->child, inkey, keylen)))
+ return err;
- crypto_cipher_encrypt_one(ctx->child, key1, ctx->consts);
+ crypto_cipher_encrypt_one(ctx->child, consts, (u8 *)ks + bs);
+ crypto_cipher_encrypt_one(ctx->child, consts + bs, (u8 *)ks + bs * 2);
+ crypto_cipher_encrypt_one(ctx->child, key1, (u8 *)ks);
return crypto_cipher_setkey(ctx->child, key1, bs);
-}
-
-static int crypto_xcbc_digest_setkey(struct crypto_shash *parent,
- const u8 *inkey, unsigned int keylen)
-{
- struct crypto_xcbc_ctx *ctx = crypto_shash_ctx(parent);
-
- if (keylen != crypto_cipher_blocksize(ctx->child))
- return -EINVAL;
- ctx->keylen = keylen;
- memcpy(ctx->key, inkey, keylen);
- ctx->consts = (u8*)ks;
-
- return _crypto_xcbc_digest_setkey(parent, ctx);
}
static int crypto_xcbc_digest_init(struct shash_desc *pdesc)
{
- struct crypto_xcbc_ctx *ctx = crypto_shash_ctx(pdesc->tfm);
+ unsigned long alignmask = crypto_shash_alignmask(pdesc->tfm);
+ struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc);
int bs = crypto_shash_blocksize(pdesc->tfm);
+ u8 *prev = PTR_ALIGN(&ctx->ctx[0], alignmask + 1) + bs;
ctx->len = 0;
- memset(ctx->odds, 0, bs);
- memset(ctx->prev, 0, bs);
+ memset(prev, 0, bs);
return 0;
}
@@ -97,39 +95,43 @@ static int crypto_xcbc_digest_update(struct shash_desc *pdesc, const u8 *p,
unsigned int len)
{
struct crypto_shash *parent = pdesc->tfm;
- struct crypto_xcbc_ctx *ctx = crypto_shash_ctx(parent);
- struct crypto_cipher *tfm = ctx->child;
+ unsigned long alignmask = crypto_shash_alignmask(parent);
+ struct xcbc_tfm_ctx *tctx = crypto_shash_ctx(parent);
+ struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc);
+ struct crypto_cipher *tfm = tctx->child;
int bs = crypto_shash_blocksize(parent);
+ u8 *odds = PTR_ALIGN(&ctx->ctx[0], alignmask + 1);
+ u8 *prev = odds + bs;
/* checking the data can fill the block */
if ((ctx->len + len) <= bs) {
- memcpy(ctx->odds + ctx->len, p, len);
+ memcpy(odds + ctx->len, p, len);
ctx->len += len;
return 0;
}
/* filling odds with new data and encrypting it */
- memcpy(ctx->odds + ctx->len, p, bs - ctx->len);
+ memcpy(odds + ctx->len, p, bs - ctx->len);
len -= bs - ctx->len;
p += bs - ctx->len;
- crypto_xor(ctx->prev, ctx->odds, bs);
- crypto_cipher_encrypt_one(tfm, ctx->prev, ctx->prev);
+ crypto_xor(prev, odds, bs);
+ crypto_cipher_encrypt_one(tfm, prev, prev);
/* clearing the length */
ctx->len = 0;
/* encrypting the rest of data */
while (len > bs) {
- crypto_xor(ctx->prev, p, bs);
- crypto_cipher_encrypt_one(tfm, ctx->prev, ctx->prev);
+ crypto_xor(prev, p, bs);
+ crypto_cipher_encrypt_one(tfm, prev, prev);
p += bs;
len -= bs;
}
/* keeping the surplus of blocksize */
if (len) {
- memcpy(ctx->odds, p, len);
+ memcpy(odds, p, len);
ctx->len = len;
}
@@ -139,29 +141,20 @@ static int crypto_xcbc_digest_update(struct shash_desc *pdesc, const u8 *p,
static int crypto_xcbc_digest_final(struct shash_desc *pdesc, u8 *out)
{
struct crypto_shash *parent = pdesc->tfm;
- struct crypto_xcbc_ctx *ctx = crypto_shash_ctx(parent);
- struct crypto_cipher *tfm = ctx->child;
+ unsigned long alignmask = crypto_shash_alignmask(parent);
+ struct xcbc_tfm_ctx *tctx = crypto_shash_ctx(parent);
+ struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc);
+ struct crypto_cipher *tfm = tctx->child;
int bs = crypto_shash_blocksize(parent);
- int err = 0;
+ u8 *consts = PTR_ALIGN(&tctx->ctx[0], alignmask + 1);
+ u8 *odds = PTR_ALIGN(&ctx->ctx[0], alignmask + 1);
+ u8 *prev = odds + bs;
+ unsigned int offset = 0;
- if (ctx->len == bs) {
- u8 key2[bs];
-
- if ((err = crypto_cipher_setkey(tfm, ctx->key, ctx->keylen)) != 0)
- return err;
-
- crypto_cipher_encrypt_one(tfm, key2,
- (u8 *)(ctx->consts + bs));
-
- crypto_xor(ctx->prev, ctx->odds, bs);
- crypto_xor(ctx->prev, key2, bs);
- _crypto_xcbc_digest_setkey(parent, ctx);
-
- crypto_cipher_encrypt_one(tfm, out, ctx->prev);
- } else {
- u8 key3[bs];
+ if (ctx->len != bs) {
unsigned int rlen;
- u8 *p = ctx->odds + ctx->len;
+ u8 *p = odds + ctx->len;
+
*p = 0x80;
p++;
@@ -169,19 +162,13 @@ static int crypto_xcbc_digest_final(struct shash_desc *pdesc, u8 *out)
if (rlen)
memset(p, 0, rlen);
- if ((err = crypto_cipher_setkey(tfm, ctx->key, ctx->keylen)) != 0)
- return err;
-
- crypto_cipher_encrypt_one(tfm, key3,
- (u8 *)(ctx->consts + bs * 2));
+ offset += bs;
+ }
- crypto_xor(ctx->prev, ctx->odds, bs);
- crypto_xor(ctx->prev, key3, bs);
+ crypto_xor(prev, odds, bs);
+ crypto_xor(prev, consts + offset, bs);
- _crypto_xcbc_digest_setkey(parent, ctx);
-
- crypto_cipher_encrypt_one(tfm, out, ctx->prev);
- }
+ crypto_cipher_encrypt_one(tfm, out, prev);
return 0;
}
@@ -191,31 +178,20 @@ static int xcbc_init_tfm(struct crypto_tfm *tfm)
struct crypto_cipher *cipher;
struct crypto_instance *inst = (void *)tfm->__crt_alg;
struct crypto_spawn *spawn = crypto_instance_ctx(inst);
- struct crypto_xcbc_ctx *ctx = crypto_tfm_ctx(tfm);
- int bs = crypto_tfm_alg_blocksize(tfm);
+ struct xcbc_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
cipher = crypto_spawn_cipher(spawn);
if (IS_ERR(cipher))
return PTR_ERR(cipher);
- switch(bs) {
- case 16:
- break;
- default:
- return -EINVAL;
- }
-
ctx->child = cipher;
- ctx->odds = (u8*)(ctx+1);
- ctx->prev = ctx->odds + bs;
- ctx->key = ctx->prev + bs;
return 0;
};
static void xcbc_exit_tfm(struct crypto_tfm *tfm)
{
- struct crypto_xcbc_ctx *ctx = crypto_tfm_ctx(tfm);
+ struct xcbc_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
crypto_free_cipher(ctx->child);
}
@@ -254,12 +230,18 @@ static int xcbc_create(struct crypto_template *tmpl, struct rtattr **tb)
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.base.cra_alignmask = alg->cra_alignmask | 3;
inst->alg.digestsize = alg->cra_blocksize;
- inst->alg.base.cra_ctxsize = sizeof(struct crypto_xcbc_ctx) +
- ALIGN(alg->cra_blocksize * 3,
- sizeof(void *));
+ inst->alg.descsize = ALIGN(sizeof(struct xcbc_desc_ctx),
+ crypto_tfm_ctx_alignment()) +
+ (alg->cra_alignmask &
+ ~(crypto_tfm_ctx_alignment() - 1)) +
+ alg->cra_blocksize * 2;
+
+ inst->alg.base.cra_ctxsize = ALIGN(sizeof(struct xcbc_tfm_ctx),
+ alg->cra_alignmask) +
+ alg->cra_blocksize * 2;
inst->alg.base.cra_init = xcbc_init_tfm;
inst->alg.base.cra_exit = xcbc_exit_tfm;