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author | Herbert Xu <herbert@gondor.apana.org.au> | 2006-08-21 21:08:13 +1000 |
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committer | Herbert Xu <herbert@gondor.apana.org.au> | 2006-09-21 11:16:30 +1000 |
commit | cce9e06d100df19a327b19f23adad76e7bf63edd (patch) | |
tree | ce10f50679db9ed8db92912c104eef1f05efc3c5 /crypto/algapi.c | |
parent | 9409f38a0c8773c04bff8dda8c552d7ea013d956 (diff) | |
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[CRYPTO] api: Split out low-level API
The crypto API is made up of the part facing users such as IPsec and the
low-level part which is used by cryptographic entities such as algorithms.
This patch splits out the latter so that the two APIs are more clearly
delineated. As a bonus the low-level API can now be modularised if all
algorithms are built as modules.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/algapi.c')
-rw-r--r-- | crypto/algapi.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/crypto/algapi.c b/crypto/algapi.c new file mode 100644 index 0000000..a65c6cc --- /dev/null +++ b/crypto/algapi.c @@ -0,0 +1,118 @@ +/* + * Cryptographic API for algorithms (i.e., low-level API). + * + * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + */ + +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/string.h> + +#include "internal.h" + +static inline int crypto_set_driver_name(struct crypto_alg *alg) +{ + static const char suffix[] = "-generic"; + char *driver_name = alg->cra_driver_name; + int len; + + if (*driver_name) + return 0; + + len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); + if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME) + return -ENAMETOOLONG; + + memcpy(driver_name + len, suffix, sizeof(suffix)); + return 0; +} + +int crypto_register_alg(struct crypto_alg *alg) +{ + int ret; + struct crypto_alg *q; + + if (alg->cra_alignmask & (alg->cra_alignmask + 1)) + return -EINVAL; + + if (alg->cra_alignmask & alg->cra_blocksize) + return -EINVAL; + + if (alg->cra_blocksize > PAGE_SIZE / 8) + return -EINVAL; + + if (alg->cra_priority < 0) + return -EINVAL; + + ret = crypto_set_driver_name(alg); + if (unlikely(ret)) + return ret; + + down_write(&crypto_alg_sem); + + list_for_each_entry(q, &crypto_alg_list, cra_list) { + if (q == alg) { + ret = -EEXIST; + goto out; + } + } + + list_add(&alg->cra_list, &crypto_alg_list); + atomic_set(&alg->cra_refcnt, 1); +out: + up_write(&crypto_alg_sem); + return ret; +} +EXPORT_SYMBOL_GPL(crypto_register_alg); + +int crypto_unregister_alg(struct crypto_alg *alg) +{ + int ret = -ENOENT; + struct crypto_alg *q; + + down_write(&crypto_alg_sem); + list_for_each_entry(q, &crypto_alg_list, cra_list) { + if (alg == q) { + list_del(&alg->cra_list); + ret = 0; + goto out; + } + } +out: + up_write(&crypto_alg_sem); + + if (ret) + return ret; + + BUG_ON(atomic_read(&alg->cra_refcnt) != 1); + if (alg->cra_destroy) + alg->cra_destroy(alg); + + return 0; +} +EXPORT_SYMBOL_GPL(crypto_unregister_alg); + +static int __init crypto_algapi_init(void) +{ + crypto_init_proc(); + return 0; +} + +static void __exit crypto_algapi_exit(void) +{ + crypto_exit_proc(); +} + +module_init(crypto_algapi_init); +module_exit(crypto_algapi_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Cryptographic algorithms API"); |