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- /*
- * ECB: Electronic CodeBook mode
- *
- * 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 <crypto/algapi.h>
- #include <linux/err.h>
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/scatterlist.h>
- #include <linux/slab.h>
- struct crypto_ecb_ctx {
- struct crypto_cipher *child;
- };
- static int crypto_ecb_setkey(struct crypto_tfm *parent, const u8 *key,
- unsigned int keylen)
- {
- struct crypto_ecb_ctx *ctx = crypto_tfm_ctx(parent);
- struct crypto_cipher *child = ctx->child;
- int err;
- crypto_cipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
- crypto_cipher_set_flags(child, crypto_tfm_get_flags(parent) &
- CRYPTO_TFM_REQ_MASK);
- err = crypto_cipher_setkey(child, key, keylen);
- crypto_tfm_set_flags(parent, crypto_cipher_get_flags(child) &
- CRYPTO_TFM_RES_MASK);
- return err;
- }
- static int crypto_ecb_crypt(struct blkcipher_desc *desc,
- struct blkcipher_walk *walk,
- struct crypto_cipher *tfm,
- void (*fn)(struct crypto_tfm *, u8 *, const u8 *))
- {
- int bsize = crypto_cipher_blocksize(tfm);
- unsigned int nbytes;
- int err;
- err = blkcipher_walk_virt(desc, walk);
- while ((nbytes = walk->nbytes)) {
- u8 *wsrc = walk->src.virt.addr;
- u8 *wdst = walk->dst.virt.addr;
- do {
- fn(crypto_cipher_tfm(tfm), wdst, wsrc);
- wsrc += bsize;
- wdst += bsize;
- } while ((nbytes -= bsize) >= bsize);
- err = blkcipher_walk_done(desc, walk, nbytes);
- }
- return err;
- }
- static int crypto_ecb_encrypt(struct blkcipher_desc *desc,
- struct scatterlist *dst, struct scatterlist *src,
- unsigned int nbytes)
- {
- struct blkcipher_walk walk;
- struct crypto_blkcipher *tfm = desc->tfm;
- struct crypto_ecb_ctx *ctx = crypto_blkcipher_ctx(tfm);
- struct crypto_cipher *child = ctx->child;
- blkcipher_walk_init(&walk, dst, src, nbytes);
- return crypto_ecb_crypt(desc, &walk, child,
- crypto_cipher_alg(child)->cia_encrypt);
- }
- static int crypto_ecb_decrypt(struct blkcipher_desc *desc,
- struct scatterlist *dst, struct scatterlist *src,
- unsigned int nbytes)
- {
- struct blkcipher_walk walk;
- struct crypto_blkcipher *tfm = desc->tfm;
- struct crypto_ecb_ctx *ctx = crypto_blkcipher_ctx(tfm);
- struct crypto_cipher *child = ctx->child;
- blkcipher_walk_init(&walk, dst, src, nbytes);
- return crypto_ecb_crypt(desc, &walk, child,
- crypto_cipher_alg(child)->cia_decrypt);
- }
- static int crypto_ecb_init_tfm(struct crypto_tfm *tfm)
- {
- struct crypto_instance *inst = (void *)tfm->__crt_alg;
- struct crypto_spawn *spawn = crypto_instance_ctx(inst);
- struct crypto_ecb_ctx *ctx = crypto_tfm_ctx(tfm);
- struct crypto_cipher *cipher;
- cipher = crypto_spawn_cipher(spawn);
- if (IS_ERR(cipher))
- return PTR_ERR(cipher);
- ctx->child = cipher;
- return 0;
- }
- static void crypto_ecb_exit_tfm(struct crypto_tfm *tfm)
- {
- struct crypto_ecb_ctx *ctx = crypto_tfm_ctx(tfm);
- crypto_free_cipher(ctx->child);
- }
- static struct crypto_instance *crypto_ecb_alloc(struct rtattr **tb)
- {
- struct crypto_instance *inst;
- struct crypto_alg *alg;
- int err;
- err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
- if (err)
- return ERR_PTR(err);
- alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
- CRYPTO_ALG_TYPE_MASK);
- if (IS_ERR(alg))
- return ERR_CAST(alg);
- inst = crypto_alloc_instance("ecb", alg);
- if (IS_ERR(inst))
- goto out_put_alg;
- inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER;
- inst->alg.cra_priority = alg->cra_priority;
- inst->alg.cra_blocksize = alg->cra_blocksize;
- inst->alg.cra_alignmask = alg->cra_alignmask;
- inst->alg.cra_type = &crypto_blkcipher_type;
- inst->alg.cra_blkcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
- inst->alg.cra_blkcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
- inst->alg.cra_ctxsize = sizeof(struct crypto_ecb_ctx);
- inst->alg.cra_init = crypto_ecb_init_tfm;
- inst->alg.cra_exit = crypto_ecb_exit_tfm;
- inst->alg.cra_blkcipher.setkey = crypto_ecb_setkey;
- inst->alg.cra_blkcipher.encrypt = crypto_ecb_encrypt;
- inst->alg.cra_blkcipher.decrypt = crypto_ecb_decrypt;
- out_put_alg:
- crypto_mod_put(alg);
- return inst;
- }
- static void crypto_ecb_free(struct crypto_instance *inst)
- {
- crypto_drop_spawn(crypto_instance_ctx(inst));
- kfree(inst);
- }
- static struct crypto_template crypto_ecb_tmpl = {
- .name = "ecb",
- .alloc = crypto_ecb_alloc,
- .free = crypto_ecb_free,
- .module = THIS_MODULE,
- };
- static int __init crypto_ecb_module_init(void)
- {
- return crypto_register_template(&crypto_ecb_tmpl);
- }
- static void __exit crypto_ecb_module_exit(void)
- {
- crypto_unregister_template(&crypto_ecb_tmpl);
- }
- module_init(crypto_ecb_module_init);
- module_exit(crypto_ecb_module_exit);
- MODULE_LICENSE("GPL");
- MODULE_DESCRIPTION("ECB block cipher algorithm");
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