// SPDX-License-Identifier: GPL-2.0-or-later/* * ECB: Electronic CodeBook mode * * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> */ #include <crypto/internal/cipher.h>#include <crypto/internal/skcipher.h>#include <linux/err.h>#include <linux/init.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/slab.h> static int crypto_ecb_crypt(struct crypto_cipher *cipher, const u8 *src,			    u8 *dst, unsigned nbytes, bool final,			    void (*fn)(struct crypto_tfm *, u8 *, const u8 *)){	const unsigned int bsize = crypto_cipher_blocksize(cipher); 	while (nbytes >= bsize) {		fn(crypto_cipher_tfm(cipher), dst, src); 		src += bsize;		dst += bsize; 		nbytes -= bsize;	} 	return nbytes && final ? -EINVAL : nbytes;} static int crypto_ecb_encrypt2(struct crypto_lskcipher *tfm, const u8 *src,			       u8 *dst, unsigned len, u8 *iv, u32 flags){	struct crypto_cipher **ctx = crypto_lskcipher_ctx(tfm);	struct crypto_cipher *cipher = *ctx; 	return crypto_ecb_crypt(cipher, src, dst, len,				flags & CRYPTO_LSKCIPHER_FLAG_FINAL,				crypto_cipher_alg(cipher)->cia_encrypt);} static int crypto_ecb_decrypt2(struct crypto_lskcipher *tfm, const u8 *src,			       u8 *dst, unsigned len, u8 *iv, u32 flags){	struct crypto_cipher **ctx = crypto_lskcipher_ctx(tfm);	struct crypto_cipher *cipher = *ctx; 	return crypto_ecb_crypt(cipher, src, dst, len,				flags & CRYPTO_LSKCIPHER_FLAG_FINAL,				crypto_cipher_alg(cipher)->cia_decrypt);} static int lskcipher_setkey_simple2(struct crypto_lskcipher *tfm,				    const u8 *key, unsigned int keylen){	struct crypto_cipher **ctx = crypto_lskcipher_ctx(tfm);	struct crypto_cipher *cipher = *ctx; 	crypto_cipher_clear_flags(cipher, CRYPTO_TFM_REQ_MASK);	crypto_cipher_set_flags(cipher, crypto_lskcipher_get_flags(tfm) &				CRYPTO_TFM_REQ_MASK);	return crypto_cipher_setkey(cipher, key, keylen);} static int lskcipher_init_tfm_simple2(struct crypto_lskcipher *tfm){	struct lskcipher_instance *inst = lskcipher_alg_instance(tfm);	struct crypto_cipher **ctx = crypto_lskcipher_ctx(tfm);	struct crypto_cipher_spawn *spawn;	struct crypto_cipher *cipher; 	spawn = lskcipher_instance_ctx(inst);	cipher = crypto_spawn_cipher(spawn);	if (IS_ERR(cipher))		return PTR_ERR(cipher); 	*ctx = cipher;	return 0;} static void lskcipher_exit_tfm_simple2(struct crypto_lskcipher *tfm){	struct crypto_cipher **ctx = crypto_lskcipher_ctx(tfm); 	crypto_free_cipher(*ctx);} static void lskcipher_free_instance_simple2(struct lskcipher_instance *inst){	crypto_drop_cipher(lskcipher_instance_ctx(inst));	kfree(inst);} static struct lskcipher_instance *lskcipher_alloc_instance_simple2(	struct crypto_template *tmpl, struct rtattr **tb){	struct crypto_cipher_spawn *spawn;	struct lskcipher_instance *inst;	struct crypto_alg *cipher_alg;	u32 mask;	int err; 	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_LSKCIPHER, &mask);	if (err)		return ERR_PTR(err); 	inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);	if (!inst)		return ERR_PTR(-ENOMEM);	spawn = lskcipher_instance_ctx(inst); 	err = crypto_grab_cipher(spawn, lskcipher_crypto_instance(inst),				 crypto_attr_alg_name(tb[1]), 0, mask);	if (err)		goto err_free_inst;	cipher_alg = crypto_spawn_cipher_alg(spawn); 	err = crypto_inst_setname(lskcipher_crypto_instance(inst), tmpl->name,				  cipher_alg);	if (err)		goto err_free_inst; 	inst->free = lskcipher_free_instance_simple2; 	/* Default algorithm properties, can be overridden */	inst->alg.co.base.cra_blocksize = cipher_alg->cra_blocksize;	inst->alg.co.base.cra_alignmask = cipher_alg->cra_alignmask;	inst->alg.co.base.cra_priority = cipher_alg->cra_priority;	inst->alg.co.min_keysize = cipher_alg->cra_cipher.cia_min_keysize;	inst->alg.co.max_keysize = cipher_alg->cra_cipher.cia_max_keysize;	inst->alg.co.ivsize = cipher_alg->cra_blocksize; 	/* Use struct crypto_cipher * by default, can be overridden */	inst->alg.co.base.cra_ctxsize = sizeof(struct crypto_cipher *);	inst->alg.setkey = lskcipher_setkey_simple2;	inst->alg.init = lskcipher_init_tfm_simple2;	inst->alg.exit = lskcipher_exit_tfm_simple2; 	return inst; err_free_inst:	lskcipher_free_instance_simple2(inst);	return ERR_PTR(err);} static int crypto_ecb_create2(struct crypto_template *tmpl, struct rtattr **tb){	struct lskcipher_instance *inst;	int err; 	inst = lskcipher_alloc_instance_simple2(tmpl, tb);	if (IS_ERR(inst))		return PTR_ERR(inst); 	/* ECB mode doesn't take an IV */	inst->alg.co.ivsize = 0; 	inst->alg.encrypt = crypto_ecb_encrypt2;	inst->alg.decrypt = crypto_ecb_decrypt2; 	err = lskcipher_register_instance(tmpl, inst);	if (err)		inst->free(inst); 	return err;} static int crypto_ecb_create(struct crypto_template *tmpl, struct rtattr **tb){	struct crypto_lskcipher_spawn *spawn;	struct lskcipher_alg *cipher_alg;	struct lskcipher_instance *inst;	int err; 	inst = lskcipher_alloc_instance_simple(tmpl, tb);	if (IS_ERR(inst)) {		err = crypto_ecb_create2(tmpl, tb);		return err;	} 	spawn = lskcipher_instance_ctx(inst);	cipher_alg = crypto_lskcipher_spawn_alg(spawn); 	/* ECB mode doesn't take an IV */	inst->alg.co.ivsize = 0;	if (cipher_alg->co.ivsize)		return -EINVAL; 	inst->alg.co.base.cra_ctxsize = cipher_alg->co.base.cra_ctxsize;	inst->alg.setkey = cipher_alg->setkey;	inst->alg.encrypt = cipher_alg->encrypt;	inst->alg.decrypt = cipher_alg->decrypt;	inst->alg.init = cipher_alg->init;	inst->alg.exit = cipher_alg->exit; 	err = lskcipher_register_instance(tmpl, inst);	if (err)		inst->free(inst); 	return err;} static struct crypto_template crypto_ecb_tmpl = {	.name = "ecb",	.create = crypto_ecb_create,	.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 mode of operation");MODULE_ALIAS_CRYPTO("ecb");MODULE_IMPORT_NS("CRYPTO_INTERNAL");