/* * 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");