5cde0af2a9
This patch adds the new type of block ciphers. Unlike current cipher algorithms which operate on a single block at a time, block ciphers operate on an arbitrarily long linear area of data. As it is block-based, it will skip any data remaining at the end which cannot form a block. The block cipher has one major difference when compared to the existing block cipher implementation. The sg walking is now performed by the algorithm rather than the cipher mid-layer. This is needed for drivers that directly support sg lists. It also improves performance for all algorithms as it reduces the total number of indirect calls by one. In future the existing cipher algorithm will be converted to only have a single-block interface. This will be done after all existing users have switched over to the new block cipher type. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
149 lines
3.5 KiB
C
149 lines
3.5 KiB
C
/*
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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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#ifndef _CRYPTO_ALGAPI_H
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#define _CRYPTO_ALGAPI_H
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#include <linux/crypto.h>
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struct module;
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struct seq_file;
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struct crypto_type {
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unsigned int (*ctxsize)(struct crypto_alg *alg);
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int (*init)(struct crypto_tfm *tfm);
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void (*exit)(struct crypto_tfm *tfm);
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void (*show)(struct seq_file *m, struct crypto_alg *alg);
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};
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struct crypto_instance {
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struct crypto_alg alg;
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struct crypto_template *tmpl;
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struct hlist_node list;
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void *__ctx[] CRYPTO_MINALIGN_ATTR;
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};
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struct crypto_template {
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struct list_head list;
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struct hlist_head instances;
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struct module *module;
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struct crypto_instance *(*alloc)(void *param, unsigned int len);
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void (*free)(struct crypto_instance *inst);
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char name[CRYPTO_MAX_ALG_NAME];
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};
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struct crypto_spawn {
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struct list_head list;
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struct crypto_alg *alg;
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struct crypto_instance *inst;
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};
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struct scatter_walk {
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struct scatterlist *sg;
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unsigned int offset;
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};
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struct blkcipher_walk {
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union {
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struct {
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struct page *page;
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unsigned long offset;
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} phys;
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struct {
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u8 *page;
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u8 *addr;
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} virt;
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} src, dst;
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struct scatter_walk in;
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unsigned int nbytes;
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struct scatter_walk out;
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unsigned int total;
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void *page;
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u8 *buffer;
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u8 *iv;
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int flags;
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};
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extern const struct crypto_type crypto_blkcipher_type;
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int crypto_register_template(struct crypto_template *tmpl);
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void crypto_unregister_template(struct crypto_template *tmpl);
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struct crypto_template *crypto_lookup_template(const char *name);
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int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
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struct crypto_instance *inst);
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void crypto_drop_spawn(struct crypto_spawn *spawn);
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struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn);
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struct crypto_alg *crypto_get_attr_alg(void *param, unsigned int len,
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u32 type, u32 mask);
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struct crypto_instance *crypto_alloc_instance(const char *name,
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struct crypto_alg *alg);
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int blkcipher_walk_done(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk, int err);
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int blkcipher_walk_virt(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk);
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int blkcipher_walk_phys(struct blkcipher_desc *desc,
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struct blkcipher_walk *walk);
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static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
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{
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unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);
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unsigned long align = crypto_tfm_alg_alignmask(tfm);
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if (align <= crypto_tfm_ctx_alignment())
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align = 1;
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return (void *)ALIGN(addr, align);
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}
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static inline void *crypto_instance_ctx(struct crypto_instance *inst)
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{
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return inst->__ctx;
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}
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static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm)
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{
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return crypto_tfm_ctx(&tfm->base);
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}
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static inline void *crypto_blkcipher_ctx_aligned(struct crypto_blkcipher *tfm)
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{
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return crypto_tfm_ctx_aligned(&tfm->base);
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}
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static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
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{
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return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
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}
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static inline void blkcipher_walk_init(struct blkcipher_walk *walk,
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struct scatterlist *dst,
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struct scatterlist *src,
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unsigned int nbytes)
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{
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walk->in.sg = src;
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walk->out.sg = dst;
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walk->total = nbytes;
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}
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#endif /* _CRYPTO_ALGAPI_H */
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