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crypto: lskcipher - Add compatibility wrapper around ECB

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As an aid to the transition from cipher algorithm implementations
to lskcipher, add a temporary wrapper when creating simple lskcipher
templates by using ecb(X) instead of X if an lskcipher implementation
of X cannot be found.

This can be reverted once all cipher implementations have switched
over to lskcipher.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2023-09-14 16:28:25 +08:00
parent 31865c4c4d
commit 8aee5d4ebd
1 changed files with 52 additions and 5 deletions
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57
crypto/lskcipher.c
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@ -536,13 +536,19 @@ struct lskcipher_instance *lskcipher_alloc_instance_simple(
u32 mask;
struct lskcipher_instance *inst;
struct crypto_lskcipher_spawn *spawn;
char ecb_name[CRYPTO_MAX_ALG_NAME];
struct lskcipher_alg *cipher_alg;
const char *cipher_name;
int err;
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_LSKCIPHER, &mask);
if (err)
return ERR_PTR(err);
cipher_name = crypto_attr_alg_name(tb[1]);
if (IS_ERR(cipher_name))
return ERR_CAST(cipher_name);
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
if (!inst)
return ERR_PTR(-ENOMEM);
@ -550,9 +556,23 @@ struct lskcipher_instance *lskcipher_alloc_instance_simple(
spawn = lskcipher_instance_ctx(inst);
err = crypto_grab_lskcipher(spawn,
lskcipher_crypto_instance(inst),
crypto_attr_alg_name(tb[1]), 0, mask);
cipher_name, 0, mask);
ecb_name[0] = 0;
if (err == -ENOENT && !!memcmp(tmpl->name, "ecb", 4)) {
err = -ENAMETOOLONG;
if (snprintf(ecb_name, CRYPTO_MAX_ALG_NAME, "ecb(%s)",
cipher_name) >= CRYPTO_MAX_ALG_NAME)
goto err_free_inst;
err = crypto_grab_lskcipher(spawn,
lskcipher_crypto_instance(inst),
ecb_name, 0, mask);
}
if (err)
goto err_free_inst;
cipher_alg = crypto_lskcipher_spawn_alg(spawn);
err = crypto_inst_setname(lskcipher_crypto_instance(inst), tmpl->name,
@ -560,10 +580,37 @@ struct lskcipher_instance *lskcipher_alloc_instance_simple(
if (err)
goto err_free_inst;
/* Don't allow nesting. */
err = -ELOOP;
if ((cipher_alg->co.base.cra_flags & CRYPTO_ALG_INSTANCE))
goto err_free_inst;
if (ecb_name[0]) {
int len;
len = strscpy(ecb_name, &cipher_alg->co.base.cra_name[4],
sizeof(ecb_name));
if (len < 2)
goto err_free_inst;
if (ecb_name[len - 1] != ')')
goto err_free_inst;
ecb_name[len - 1] = 0;
err = -ENAMETOOLONG;
if (snprintf(inst->alg.co.base.cra_name, CRYPTO_MAX_ALG_NAME,
"%s(%s)", tmpl->name, ecb_name) >=
CRYPTO_MAX_ALG_NAME)
goto err_free_inst;
if (strcmp(ecb_name, cipher_name) &&
snprintf(inst->alg.co.base.cra_driver_name,
CRYPTO_MAX_ALG_NAME,
"%s(%s)", tmpl->name, cipher_name) >=
CRYPTO_MAX_ALG_NAME)
goto err_free_inst;
} else {
/* Don't allow nesting. */
err = -ELOOP;
if ((cipher_alg->co.base.cra_flags & CRYPTO_ALG_INSTANCE))
goto err_free_inst;
}
err = -EINVAL;
if (cipher_alg->co.ivsize)