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This is the first step on the road towards asynchronous support in the Crypto API. It adds support for having multiple crypto_alg objects for the same algorithm registered in the system. For example, each device driver would register a crypto_alg object for each algorithm that it supports. While at the same time the user may load software implementations of those same algorithms. Users of the Crypto API may then select a specific implementation by name, or choose any implementation for a given algorithm with the highest priority. The priority field is a 32-bit signed integer. In future it will be possible to modify it from user-space. This also provides a solution to the problem of selecting amongst various AES implementations, that is, aes vs. aes-i586 vs. aes-padlock. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
112 lines
2.8 KiB
C
112 lines
2.8 KiB
C
/*
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* Cryptographic API.
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*
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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* Copyright (c) 2005 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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#ifndef _CRYPTO_INTERNAL_H
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#define _CRYPTO_INTERNAL_H
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#include <linux/crypto.h>
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#include <linux/mm.h>
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#include <linux/highmem.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/kernel.h>
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#include <linux/rwsem.h>
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#include <linux/slab.h>
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#include <asm/kmap_types.h>
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extern struct list_head crypto_alg_list;
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extern struct rw_semaphore crypto_alg_sem;
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extern enum km_type crypto_km_types[];
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static inline enum km_type crypto_kmap_type(int out)
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{
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return crypto_km_types[(in_softirq() ? 2 : 0) + out];
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}
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static inline void *crypto_kmap(struct page *page, int out)
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{
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return kmap_atomic(page, crypto_kmap_type(out));
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}
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static inline void crypto_kunmap(void *vaddr, int out)
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{
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kunmap_atomic(vaddr, crypto_kmap_type(out));
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}
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static inline void crypto_yield(struct crypto_tfm *tfm)
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{
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if (tfm->crt_flags & CRYPTO_TFM_REQ_MAY_SLEEP)
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cond_resched();
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}
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#ifdef CONFIG_CRYPTO_HMAC
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int crypto_alloc_hmac_block(struct crypto_tfm *tfm);
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void crypto_free_hmac_block(struct crypto_tfm *tfm);
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#else
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static inline int crypto_alloc_hmac_block(struct crypto_tfm *tfm)
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{
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return 0;
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}
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static inline void crypto_free_hmac_block(struct crypto_tfm *tfm)
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{ }
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#endif
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#ifdef CONFIG_PROC_FS
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void __init crypto_init_proc(void);
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#else
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static inline void crypto_init_proc(void)
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{ }
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#endif
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static inline unsigned int crypto_digest_ctxsize(struct crypto_alg *alg,
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int flags)
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{
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return alg->cra_ctxsize;
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}
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static inline unsigned int crypto_cipher_ctxsize(struct crypto_alg *alg,
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int flags)
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{
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unsigned int len = alg->cra_ctxsize;
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switch (flags & CRYPTO_TFM_MODE_MASK) {
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case CRYPTO_TFM_MODE_CBC:
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len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
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len += alg->cra_blocksize;
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break;
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}
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return len;
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}
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static inline unsigned int crypto_compress_ctxsize(struct crypto_alg *alg,
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int flags)
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{
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return alg->cra_ctxsize;
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}
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int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags);
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int crypto_init_cipher_flags(struct crypto_tfm *tfm, u32 flags);
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int crypto_init_compress_flags(struct crypto_tfm *tfm, u32 flags);
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int crypto_init_digest_ops(struct crypto_tfm *tfm);
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int crypto_init_cipher_ops(struct crypto_tfm *tfm);
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int crypto_init_compress_ops(struct crypto_tfm *tfm);
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void crypto_exit_digest_ops(struct crypto_tfm *tfm);
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void crypto_exit_cipher_ops(struct crypto_tfm *tfm);
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void crypto_exit_compress_ops(struct crypto_tfm *tfm);
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#endif /* _CRYPTO_INTERNAL_H */
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