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Commit 2e306ee0 authored by Herbert Xu's avatar Herbert Xu
Browse files

[CRYPTO] api: Add type-safe spawns 



This patch allows spawns of specific types (e.g., cipher) to be allocated.

Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent f1ddcaf3

crypto/algapi.c

+11 −2
Original line number Diff line number Diff line
@@ -377,7 +377,8 @@ void crypto_drop_spawn(struct crypto_spawn *spawn) 
}

EXPORT_SYMBOL_GPL(crypto_drop_spawn);



struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn)

struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,

				    u32 mask)

{

	struct crypto_alg *alg;

	struct crypto_alg *alg2;
@@ -396,11 +397,19 @@ struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn) 
		return ERR_PTR(-EAGAIN);

	}



	tfm = ERR_PTR(-EINVAL);

	if (unlikely((alg->cra_flags ^ type) & mask))

		goto out_put_alg;



	tfm = __crypto_alloc_tfm(alg);

	if (IS_ERR(tfm))

		crypto_mod_put(alg);

		goto out_put_alg;



	return tfm;



out_put_alg:

	crypto_mod_put(alg);

	return tfm;

}

EXPORT_SYMBOL_GPL(crypto_spawn_tfm);

crypto/cbc.c

+5 −4
Original line number Diff line number Diff line
@@ -243,6 +243,7 @@ static int crypto_cbc_init_tfm(struct crypto_tfm *tfm) 
	struct crypto_instance *inst = (void *)tfm->__crt_alg;

	struct crypto_spawn *spawn = crypto_instance_ctx(inst);

	struct crypto_cbc_ctx *ctx = crypto_tfm_ctx(tfm);

	struct crypto_cipher *cipher;



	switch (crypto_tfm_alg_blocksize(tfm)) {

	case 8:
@@ -260,11 +261,11 @@ static int crypto_cbc_init_tfm(struct crypto_tfm *tfm) 
			ctx->xor = xor_quad;

	}



	tfm = crypto_spawn_tfm(spawn);

	if (IS_ERR(tfm))

		return PTR_ERR(tfm);

	cipher = crypto_spawn_cipher(spawn);

	if (IS_ERR(cipher))

		return PTR_ERR(cipher);



	ctx->child = crypto_cipher_cast(tfm);

	ctx->child = cipher;

	return 0;

}

crypto/ecb.c

+5 −4
Original line number Diff line number Diff line
@@ -99,12 +99,13 @@ static int crypto_ecb_init_tfm(struct crypto_tfm *tfm) 
	struct crypto_instance *inst = (void *)tfm->__crt_alg;

	struct crypto_spawn *spawn = crypto_instance_ctx(inst);

	struct crypto_ecb_ctx *ctx = crypto_tfm_ctx(tfm);

	struct crypto_cipher *cipher;



	tfm = crypto_spawn_tfm(spawn);

	if (IS_ERR(tfm))

		return PTR_ERR(tfm);

	cipher = crypto_spawn_cipher(spawn);

	if (IS_ERR(cipher))

		return PTR_ERR(cipher);



	ctx->child = crypto_cipher_cast(tfm);

	ctx->child = cipher;

	return 0;

}

crypto/hmac.c

+5 −4
Original line number Diff line number Diff line
@@ -172,15 +172,16 @@ static int hmac_digest(struct hash_desc *pdesc, struct scatterlist *sg, 


static int hmac_init_tfm(struct crypto_tfm *tfm)

{

	struct crypto_hash *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));



	tfm = crypto_spawn_tfm(spawn);

	if (IS_ERR(tfm))

		return PTR_ERR(tfm);

	hash = crypto_spawn_hash(spawn);

	if (IS_ERR(hash))

		return PTR_ERR(hash);



	ctx->child = crypto_hash_cast(tfm);

	ctx->child = hash;

	return 0;

}

crypto/lrw.c

+6 −5
Original line number Diff line number Diff line
@@ -201,21 +201,22 @@ static int decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, 


static int 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 priv *ctx = crypto_tfm_ctx(tfm);

	u32 *flags = &tfm->crt_flags;



	tfm = crypto_spawn_tfm(spawn);

	if (IS_ERR(tfm))

		return PTR_ERR(tfm);

	cipher = crypto_spawn_cipher(spawn);

	if (IS_ERR(cipher))

		return PTR_ERR(cipher);



	if (crypto_tfm_alg_blocksize(tfm) != 16) {

	if (crypto_cipher_blocksize(cipher) != 16) {

		*flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;

		return -EINVAL;

	}



	ctx->child = crypto_cipher_cast(tfm);

	ctx->child = cipher;

	return 0;

}