// 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); } subsys_initcall(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);