--- /dev/null
+//SPDX-License-Identifier: GPL-2.0
+/*
+ * CFB: Cipher FeedBack mode
+ *
+ * Copyright (c) 2018 James.Bottomley@HansenPartnership.com
+ *
+ * CFB is a stream cipher mode which is layered on to a block
+ * encryption scheme. It works very much like a one time pad where
+ * the pad is generated initially from the encrypted IV and then
+ * subsequently from the encrypted previous block of ciphertext. The
+ * pad is XOR'd into the plain text to get the final ciphertext.
+ *
+ * The scheme of CFB is best described by wikipedia:
+ *
+ * https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#CFB
+ *
+ * Note that since the pad for both encryption and decryption is
+ * generated by an encryption operation, CFB never uses the block
+ * decryption function.
+ */
+
+#include <crypto/algapi.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>
+#include <linux/string.h>
+#include <linux/types.h>
+
+struct crypto_cfb_ctx {
+ struct crypto_cipher *child;
+};
+
+static unsigned int crypto_cfb_bsize(struct crypto_skcipher *tfm)
+{
+ struct crypto_cfb_ctx *ctx = crypto_skcipher_ctx(tfm);
+ struct crypto_cipher *child = ctx->child;
+
+ return crypto_cipher_blocksize(child);
+}
+
+static void crypto_cfb_encrypt_one(struct crypto_skcipher *tfm,
+ const u8 *src, u8 *dst)
+{
+ struct crypto_cfb_ctx *ctx = crypto_skcipher_ctx(tfm);
+
+ crypto_cipher_encrypt_one(ctx->child, dst, src);
+}
+
+/* final encrypt and decrypt is the same */
+static void crypto_cfb_final(struct skcipher_walk *walk,
+ struct crypto_skcipher *tfm)
+{
+ const unsigned int bsize = crypto_cfb_bsize(tfm);
+ const unsigned long alignmask = crypto_skcipher_alignmask(tfm);
+ u8 tmp[bsize + alignmask];
+ u8 *stream = PTR_ALIGN(tmp + 0, alignmask + 1);
+ u8 *src = walk->src.virt.addr;
+ u8 *dst = walk->dst.virt.addr;
+ u8 *iv = walk->iv;
+ unsigned int nbytes = walk->nbytes;
+
+ crypto_cfb_encrypt_one(tfm, iv, stream);
+ crypto_xor_cpy(dst, stream, src, nbytes);
+}
+
+static int crypto_cfb_encrypt_segment(struct skcipher_walk *walk,
+ struct crypto_skcipher *tfm)
+{
+ const unsigned int bsize = crypto_cfb_bsize(tfm);
+ unsigned int nbytes = walk->nbytes;
+ u8 *src = walk->src.virt.addr;
+ u8 *dst = walk->dst.virt.addr;
+ u8 *iv = walk->iv;
+
+ do {
+ crypto_cfb_encrypt_one(tfm, iv, dst);
+ crypto_xor(dst, src, bsize);
+ memcpy(iv, dst, bsize);
+
+ src += bsize;
+ dst += bsize;
+ } while ((nbytes -= bsize) >= bsize);
+
+ return nbytes;
+}
+
+static int crypto_cfb_encrypt_inplace(struct skcipher_walk *walk,
+ struct crypto_skcipher *tfm)
+{
+ const unsigned int bsize = crypto_cfb_bsize(tfm);
+ unsigned int nbytes = walk->nbytes;
+ u8 *src = walk->src.virt.addr;
+ u8 *iv = walk->iv;
+ u8 tmp[bsize];
+
+ do {
+ crypto_cfb_encrypt_one(tfm, iv, tmp);
+ crypto_xor(src, tmp, bsize);
+ iv = src;
+
+ src += bsize;
+ } while ((nbytes -= bsize) >= bsize);
+
+ memcpy(walk->iv, iv, bsize);
+
+ return nbytes;
+}
+
+static int crypto_cfb_encrypt(struct skcipher_request *req)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct skcipher_walk walk;
+ unsigned int bsize = crypto_cfb_bsize(tfm);
+ int err;
+
+ err = skcipher_walk_virt(&walk, req, false);
+
+ while (walk.nbytes >= bsize) {
+ if (walk.src.virt.addr == walk.dst.virt.addr)
+ err = crypto_cfb_encrypt_inplace(&walk, tfm);
+ else
+ err = crypto_cfb_encrypt_segment(&walk, tfm);
+ err = skcipher_walk_done(&walk, err);
+ }
+
+ if (walk.nbytes) {
+ crypto_cfb_final(&walk, tfm);
+ err = skcipher_walk_done(&walk, 0);
+ }
+
+ return err;
+}
+
+static int crypto_cfb_decrypt_segment(struct skcipher_walk *walk,
+ struct crypto_skcipher *tfm)
+{
+ const unsigned int bsize = crypto_cfb_bsize(tfm);
+ unsigned int nbytes = walk->nbytes;
+ u8 *src = walk->src.virt.addr;
+ u8 *dst = walk->dst.virt.addr;
+ u8 *iv = walk->iv;
+
+ do {
+ crypto_cfb_encrypt_one(tfm, iv, dst);
+ crypto_xor(dst, iv, bsize);
+ iv = src;
+
+ src += bsize;
+ dst += bsize;
+ } while ((nbytes -= bsize) >= bsize);
+
+ memcpy(walk->iv, iv, bsize);
+
+ return nbytes;
+}
+
+static int crypto_cfb_decrypt_inplace(struct skcipher_walk *walk,
+ struct crypto_skcipher *tfm)
+{
+ const unsigned int bsize = crypto_cfb_bsize(tfm);
+ unsigned int nbytes = walk->nbytes;
+ u8 *src = walk->src.virt.addr;
+ u8 *iv = walk->iv;
+ u8 tmp[bsize];
+
+ do {
+ crypto_cfb_encrypt_one(tfm, iv, tmp);
+ memcpy(iv, src, bsize);
+ crypto_xor(src, tmp, bsize);
+ src += bsize;
+ } while ((nbytes -= bsize) >= bsize);
+
+ memcpy(walk->iv, iv, bsize);
+
+ return nbytes;
+}
+
+static int crypto_cfb_decrypt_blocks(struct skcipher_walk *walk,
+ struct crypto_skcipher *tfm)
+{
+ if (walk->src.virt.addr == walk->dst.virt.addr)
+ return crypto_cfb_decrypt_inplace(walk, tfm);
+ else
+ return crypto_cfb_decrypt_segment(walk, tfm);
+}
+
+static int crypto_cfb_setkey(struct crypto_skcipher *parent, const u8 *key,
+ unsigned int keylen)
+{
+ struct crypto_cfb_ctx *ctx = crypto_skcipher_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_skcipher_get_flags(parent) &
+ CRYPTO_TFM_REQ_MASK);
+ err = crypto_cipher_setkey(child, key, keylen);
+ crypto_skcipher_set_flags(parent, crypto_cipher_get_flags(child) &
+ CRYPTO_TFM_RES_MASK);
+ return err;
+}
+
+static int crypto_cfb_decrypt(struct skcipher_request *req)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct skcipher_walk walk;
+ const unsigned int bsize = crypto_cfb_bsize(tfm);
+ int err;
+
+ err = skcipher_walk_virt(&walk, req, false);
+
+ while (walk.nbytes >= bsize) {
+ err = crypto_cfb_decrypt_blocks(&walk, tfm);
+ err = skcipher_walk_done(&walk, err);
+ }
+
+ if (walk.nbytes) {
+ crypto_cfb_final(&walk, tfm);
+ err = skcipher_walk_done(&walk, 0);
+ }
+
+ return err;
+}
+
+static int crypto_cfb_init_tfm(struct crypto_skcipher *tfm)
+{
+ struct skcipher_instance *inst = skcipher_alg_instance(tfm);
+ struct crypto_spawn *spawn = skcipher_instance_ctx(inst);
+ struct crypto_cfb_ctx *ctx = crypto_skcipher_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_cfb_exit_tfm(struct crypto_skcipher *tfm)
+{
+ struct crypto_cfb_ctx *ctx = crypto_skcipher_ctx(tfm);
+
+ crypto_free_cipher(ctx->child);
+}
+
+static void crypto_cfb_free(struct skcipher_instance *inst)
+{
+ crypto_drop_skcipher(skcipher_instance_ctx(inst));
+ kfree(inst);
+}
+
+static int crypto_cfb_create(struct crypto_template *tmpl, struct rtattr **tb)
+{
+ struct skcipher_instance *inst;
+ struct crypto_attr_type *algt;
+ struct crypto_spawn *spawn;
+ struct crypto_alg *alg;
+ u32 mask;
+ int err;
+
+ err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SKCIPHER);
+ if (err)
+ return err;
+
+ inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
+ if (!inst)
+ return -ENOMEM;
+
+ algt = crypto_get_attr_type(tb);
+ err = PTR_ERR(algt);
+ if (IS_ERR(algt))
+ goto err_free_inst;
+
+ mask = CRYPTO_ALG_TYPE_MASK |
+ crypto_requires_off(algt->type, algt->mask,
+ CRYPTO_ALG_NEED_FALLBACK);
+
+ alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER, mask);
+ err = PTR_ERR(alg);
+ if (IS_ERR(alg))
+ goto err_free_inst;
+
+ spawn = skcipher_instance_ctx(inst);
+ err = crypto_init_spawn(spawn, alg, skcipher_crypto_instance(inst),
+ CRYPTO_ALG_TYPE_MASK);
+ crypto_mod_put(alg);
+ if (err)
+ goto err_free_inst;
+
+ err = crypto_inst_setname(skcipher_crypto_instance(inst), "cfb", alg);
+ if (err)
+ goto err_drop_spawn;
+
+ inst->alg.base.cra_priority = alg->cra_priority;
+ /* we're a stream cipher independend of the crypto cra_blocksize */
+ inst->alg.base.cra_blocksize = 1;
+ inst->alg.base.cra_alignmask = alg->cra_alignmask;
+
+ inst->alg.ivsize = alg->cra_blocksize;
+ inst->alg.min_keysize = alg->cra_cipher.cia_min_keysize;
+ inst->alg.max_keysize = alg->cra_cipher.cia_max_keysize;
+
+ inst->alg.base.cra_ctxsize = sizeof(struct crypto_cfb_ctx);
+
+ inst->alg.init = crypto_cfb_init_tfm;
+ inst->alg.exit = crypto_cfb_exit_tfm;
+
+ inst->alg.setkey = crypto_cfb_setkey;
+ inst->alg.encrypt = crypto_cfb_encrypt;
+ inst->alg.decrypt = crypto_cfb_decrypt;
+
+ inst->free = crypto_cfb_free;
+
+ err = skcipher_register_instance(tmpl, inst);
+ if (err)
+ goto err_drop_spawn;
+
+out:
+ return err;
+
+err_drop_spawn:
+ crypto_drop_spawn(spawn);
+err_free_inst:
+ kfree(inst);
+ goto out;
+}
+
+static struct crypto_template crypto_cfb_tmpl = {
+ .name = "cfb",
+ .create = crypto_cfb_create,
+ .module = THIS_MODULE,
+};
+
+static int __init crypto_cfb_module_init(void)
+{
+ return crypto_register_template(&crypto_cfb_tmpl);
+}
+
+static void __exit crypto_cfb_module_exit(void)
+{
+ crypto_unregister_template(&crypto_cfb_tmpl);
+}
+
+module_init(crypto_cfb_module_init);
+module_exit(crypto_cfb_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("CFB block cipher algorithm");
+MODULE_ALIAS_CRYPTO("cfb");
projects / openwrt / staging / blogic.git / commitdiff