119 lines
2.4 KiB
C
119 lines
2.4 KiB
C
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/*
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* Cryptographic API for algorithms (i.e., low-level API).
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*
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* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include "internal.h"
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static inline int crypto_set_driver_name(struct crypto_alg *alg)
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{
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static const char suffix[] = "-generic";
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char *driver_name = alg->cra_driver_name;
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int len;
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if (*driver_name)
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return 0;
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len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
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if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
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return -ENAMETOOLONG;
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memcpy(driver_name + len, suffix, sizeof(suffix));
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return 0;
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}
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int crypto_register_alg(struct crypto_alg *alg)
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{
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int ret;
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struct crypto_alg *q;
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if (alg->cra_alignmask & (alg->cra_alignmask + 1))
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return -EINVAL;
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if (alg->cra_alignmask & alg->cra_blocksize)
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return -EINVAL;
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if (alg->cra_blocksize > PAGE_SIZE / 8)
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return -EINVAL;
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if (alg->cra_priority < 0)
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return -EINVAL;
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ret = crypto_set_driver_name(alg);
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if (unlikely(ret))
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return ret;
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down_write(&crypto_alg_sem);
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list_for_each_entry(q, &crypto_alg_list, cra_list) {
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if (q == alg) {
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ret = -EEXIST;
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goto out;
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}
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}
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list_add(&alg->cra_list, &crypto_alg_list);
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atomic_set(&alg->cra_refcnt, 1);
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out:
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up_write(&crypto_alg_sem);
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return ret;
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}
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EXPORT_SYMBOL_GPL(crypto_register_alg);
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int crypto_unregister_alg(struct crypto_alg *alg)
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{
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int ret = -ENOENT;
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struct crypto_alg *q;
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down_write(&crypto_alg_sem);
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list_for_each_entry(q, &crypto_alg_list, cra_list) {
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if (alg == q) {
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list_del(&alg->cra_list);
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ret = 0;
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goto out;
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}
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}
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out:
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up_write(&crypto_alg_sem);
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if (ret)
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return ret;
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BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
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if (alg->cra_destroy)
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alg->cra_destroy(alg);
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_unregister_alg);
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static int __init crypto_algapi_init(void)
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{
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crypto_init_proc();
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return 0;
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}
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static void __exit crypto_algapi_exit(void)
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{
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crypto_exit_proc();
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}
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module_init(crypto_algapi_init);
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module_exit(crypto_algapi_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Cryptographic algorithms API");
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