593 lines
16 KiB
C
593 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Linear symmetric key cipher operations.
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*
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* Generic encrypt/decrypt wrapper for ciphers.
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*
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* Copyright (c) 2023 Herbert Xu <herbert@gondor.apana.org.au>
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*/
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#include <linux/cryptouser.h>
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#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <net/netlink.h>
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#include "skcipher.h"
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static inline struct crypto_lskcipher *__crypto_lskcipher_cast(
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struct crypto_tfm *tfm)
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{
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return container_of(tfm, struct crypto_lskcipher, base);
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}
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static inline struct lskcipher_alg *__crypto_lskcipher_alg(
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struct crypto_alg *alg)
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{
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return container_of(alg, struct lskcipher_alg, co.base);
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}
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static int lskcipher_setkey_unaligned(struct crypto_lskcipher *tfm,
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const u8 *key, unsigned int keylen)
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{
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unsigned long alignmask = crypto_lskcipher_alignmask(tfm);
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struct lskcipher_alg *cipher = crypto_lskcipher_alg(tfm);
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u8 *buffer, *alignbuffer;
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unsigned long absize;
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int ret;
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absize = keylen + alignmask;
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buffer = kmalloc(absize, GFP_ATOMIC);
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if (!buffer)
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return -ENOMEM;
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alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
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memcpy(alignbuffer, key, keylen);
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ret = cipher->setkey(tfm, alignbuffer, keylen);
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kfree_sensitive(buffer);
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return ret;
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}
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int crypto_lskcipher_setkey(struct crypto_lskcipher *tfm, const u8 *key,
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unsigned int keylen)
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{
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unsigned long alignmask = crypto_lskcipher_alignmask(tfm);
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struct lskcipher_alg *cipher = crypto_lskcipher_alg(tfm);
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if (keylen < cipher->co.min_keysize || keylen > cipher->co.max_keysize)
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return -EINVAL;
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if ((unsigned long)key & alignmask)
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return lskcipher_setkey_unaligned(tfm, key, keylen);
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else
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return cipher->setkey(tfm, key, keylen);
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}
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EXPORT_SYMBOL_GPL(crypto_lskcipher_setkey);
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static int crypto_lskcipher_crypt_unaligned(
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struct crypto_lskcipher *tfm, const u8 *src, u8 *dst, unsigned len,
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u8 *iv, int (*crypt)(struct crypto_lskcipher *tfm, const u8 *src,
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u8 *dst, unsigned len, u8 *iv, u32 flags))
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{
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unsigned statesize = crypto_lskcipher_statesize(tfm);
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unsigned ivsize = crypto_lskcipher_ivsize(tfm);
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unsigned bs = crypto_lskcipher_blocksize(tfm);
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unsigned cs = crypto_lskcipher_chunksize(tfm);
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int err;
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u8 *tiv;
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u8 *p;
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BUILD_BUG_ON(MAX_CIPHER_BLOCKSIZE > PAGE_SIZE ||
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MAX_CIPHER_ALIGNMASK >= PAGE_SIZE);
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tiv = kmalloc(PAGE_SIZE, GFP_ATOMIC);
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if (!tiv)
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return -ENOMEM;
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memcpy(tiv, iv, ivsize + statesize);
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p = kmalloc(PAGE_SIZE, GFP_ATOMIC);
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err = -ENOMEM;
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if (!p)
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goto out;
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while (len >= bs) {
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unsigned chunk = min((unsigned)PAGE_SIZE, len);
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int err;
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if (chunk > cs)
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chunk &= ~(cs - 1);
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memcpy(p, src, chunk);
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err = crypt(tfm, p, p, chunk, tiv, CRYPTO_LSKCIPHER_FLAG_FINAL);
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if (err)
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goto out;
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memcpy(dst, p, chunk);
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src += chunk;
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dst += chunk;
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len -= chunk;
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}
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err = len ? -EINVAL : 0;
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out:
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memcpy(iv, tiv, ivsize + statesize);
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kfree_sensitive(p);
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kfree_sensitive(tiv);
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return err;
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}
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static int crypto_lskcipher_crypt(struct crypto_lskcipher *tfm, const u8 *src,
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u8 *dst, unsigned len, u8 *iv,
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int (*crypt)(struct crypto_lskcipher *tfm,
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const u8 *src, u8 *dst,
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unsigned len, u8 *iv,
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u32 flags))
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{
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unsigned long alignmask = crypto_lskcipher_alignmask(tfm);
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if (((unsigned long)src | (unsigned long)dst | (unsigned long)iv) &
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alignmask)
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return crypto_lskcipher_crypt_unaligned(tfm, src, dst, len, iv,
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crypt);
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return crypt(tfm, src, dst, len, iv, CRYPTO_LSKCIPHER_FLAG_FINAL);
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}
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int crypto_lskcipher_encrypt(struct crypto_lskcipher *tfm, const u8 *src,
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u8 *dst, unsigned len, u8 *iv)
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{
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struct lskcipher_alg *alg = crypto_lskcipher_alg(tfm);
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return crypto_lskcipher_crypt(tfm, src, dst, len, iv, alg->encrypt);
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}
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EXPORT_SYMBOL_GPL(crypto_lskcipher_encrypt);
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int crypto_lskcipher_decrypt(struct crypto_lskcipher *tfm, const u8 *src,
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u8 *dst, unsigned len, u8 *iv)
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{
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struct lskcipher_alg *alg = crypto_lskcipher_alg(tfm);
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return crypto_lskcipher_crypt(tfm, src, dst, len, iv, alg->decrypt);
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}
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EXPORT_SYMBOL_GPL(crypto_lskcipher_decrypt);
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static int crypto_lskcipher_crypt_sg(struct skcipher_request *req,
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int (*crypt)(struct crypto_lskcipher *tfm,
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const u8 *src, u8 *dst,
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unsigned len, u8 *ivs,
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u32 flags))
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{
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struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
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struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher);
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u8 *ivs = skcipher_request_ctx(req);
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struct crypto_lskcipher *tfm = *ctx;
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struct skcipher_walk walk;
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unsigned ivsize;
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u32 flags;
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int err;
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ivsize = crypto_lskcipher_ivsize(tfm);
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ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(skcipher) + 1);
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memcpy(ivs, req->iv, ivsize);
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flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
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if (req->base.flags & CRYPTO_SKCIPHER_REQ_CONT)
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flags |= CRYPTO_LSKCIPHER_FLAG_CONT;
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if (!(req->base.flags & CRYPTO_SKCIPHER_REQ_NOTFINAL))
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flags |= CRYPTO_LSKCIPHER_FLAG_FINAL;
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err = skcipher_walk_virt(&walk, req, false);
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while (walk.nbytes) {
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err = crypt(tfm, walk.src.virt.addr, walk.dst.virt.addr,
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walk.nbytes, ivs,
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flags & ~(walk.nbytes == walk.total ?
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0 : CRYPTO_LSKCIPHER_FLAG_FINAL));
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err = skcipher_walk_done(&walk, err);
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flags |= CRYPTO_LSKCIPHER_FLAG_CONT;
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}
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memcpy(req->iv, ivs, ivsize);
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return err;
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}
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int crypto_lskcipher_encrypt_sg(struct skcipher_request *req)
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{
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struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
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struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher);
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struct lskcipher_alg *alg = crypto_lskcipher_alg(*ctx);
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return crypto_lskcipher_crypt_sg(req, alg->encrypt);
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}
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int crypto_lskcipher_decrypt_sg(struct skcipher_request *req)
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{
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struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
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struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher);
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struct lskcipher_alg *alg = crypto_lskcipher_alg(*ctx);
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return crypto_lskcipher_crypt_sg(req, alg->decrypt);
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}
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static void crypto_lskcipher_exit_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_lskcipher *skcipher = __crypto_lskcipher_cast(tfm);
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struct lskcipher_alg *alg = crypto_lskcipher_alg(skcipher);
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alg->exit(skcipher);
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}
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static int crypto_lskcipher_init_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_lskcipher *skcipher = __crypto_lskcipher_cast(tfm);
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struct lskcipher_alg *alg = crypto_lskcipher_alg(skcipher);
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if (alg->exit)
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skcipher->base.exit = crypto_lskcipher_exit_tfm;
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if (alg->init)
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return alg->init(skcipher);
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return 0;
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}
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static void crypto_lskcipher_free_instance(struct crypto_instance *inst)
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{
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struct lskcipher_instance *skcipher =
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container_of(inst, struct lskcipher_instance, s.base);
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skcipher->free(skcipher);
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}
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static void __maybe_unused crypto_lskcipher_show(
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struct seq_file *m, struct crypto_alg *alg)
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{
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struct lskcipher_alg *skcipher = __crypto_lskcipher_alg(alg);
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seq_printf(m, "type : lskcipher\n");
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seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
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seq_printf(m, "min keysize : %u\n", skcipher->co.min_keysize);
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seq_printf(m, "max keysize : %u\n", skcipher->co.max_keysize);
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seq_printf(m, "ivsize : %u\n", skcipher->co.ivsize);
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seq_printf(m, "chunksize : %u\n", skcipher->co.chunksize);
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seq_printf(m, "statesize : %u\n", skcipher->co.statesize);
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}
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static int __maybe_unused crypto_lskcipher_report(
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struct sk_buff *skb, struct crypto_alg *alg)
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{
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struct lskcipher_alg *skcipher = __crypto_lskcipher_alg(alg);
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struct crypto_report_blkcipher rblkcipher;
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memset(&rblkcipher, 0, sizeof(rblkcipher));
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strscpy(rblkcipher.type, "lskcipher", sizeof(rblkcipher.type));
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strscpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv));
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rblkcipher.blocksize = alg->cra_blocksize;
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rblkcipher.min_keysize = skcipher->co.min_keysize;
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rblkcipher.max_keysize = skcipher->co.max_keysize;
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rblkcipher.ivsize = skcipher->co.ivsize;
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return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
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sizeof(rblkcipher), &rblkcipher);
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}
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static const struct crypto_type crypto_lskcipher_type = {
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.extsize = crypto_alg_extsize,
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.init_tfm = crypto_lskcipher_init_tfm,
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.free = crypto_lskcipher_free_instance,
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#ifdef CONFIG_PROC_FS
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.show = crypto_lskcipher_show,
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#endif
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#if IS_ENABLED(CONFIG_CRYPTO_USER)
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.report = crypto_lskcipher_report,
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#endif
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.maskclear = ~CRYPTO_ALG_TYPE_MASK,
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.maskset = CRYPTO_ALG_TYPE_MASK,
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.type = CRYPTO_ALG_TYPE_LSKCIPHER,
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.tfmsize = offsetof(struct crypto_lskcipher, base),
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};
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static void crypto_lskcipher_exit_tfm_sg(struct crypto_tfm *tfm)
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{
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struct crypto_lskcipher **ctx = crypto_tfm_ctx(tfm);
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crypto_free_lskcipher(*ctx);
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}
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int crypto_init_lskcipher_ops_sg(struct crypto_tfm *tfm)
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{
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struct crypto_lskcipher **ctx = crypto_tfm_ctx(tfm);
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struct crypto_alg *calg = tfm->__crt_alg;
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struct crypto_lskcipher *skcipher;
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if (!crypto_mod_get(calg))
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return -EAGAIN;
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skcipher = crypto_create_tfm(calg, &crypto_lskcipher_type);
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if (IS_ERR(skcipher)) {
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crypto_mod_put(calg);
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return PTR_ERR(skcipher);
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}
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*ctx = skcipher;
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tfm->exit = crypto_lskcipher_exit_tfm_sg;
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return 0;
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}
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int crypto_grab_lskcipher(struct crypto_lskcipher_spawn *spawn,
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struct crypto_instance *inst,
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const char *name, u32 type, u32 mask)
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{
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spawn->base.frontend = &crypto_lskcipher_type;
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return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
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}
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EXPORT_SYMBOL_GPL(crypto_grab_lskcipher);
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struct crypto_lskcipher *crypto_alloc_lskcipher(const char *alg_name,
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u32 type, u32 mask)
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{
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return crypto_alloc_tfm(alg_name, &crypto_lskcipher_type, type, mask);
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}
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EXPORT_SYMBOL_GPL(crypto_alloc_lskcipher);
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static int lskcipher_prepare_alg(struct lskcipher_alg *alg)
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{
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struct crypto_alg *base = &alg->co.base;
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int err;
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err = skcipher_prepare_alg_common(&alg->co);
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if (err)
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return err;
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if (alg->co.chunksize & (alg->co.chunksize - 1))
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return -EINVAL;
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base->cra_type = &crypto_lskcipher_type;
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base->cra_flags |= CRYPTO_ALG_TYPE_LSKCIPHER;
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return 0;
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}
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int crypto_register_lskcipher(struct lskcipher_alg *alg)
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{
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struct crypto_alg *base = &alg->co.base;
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int err;
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err = lskcipher_prepare_alg(alg);
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if (err)
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return err;
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return crypto_register_alg(base);
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}
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EXPORT_SYMBOL_GPL(crypto_register_lskcipher);
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void crypto_unregister_lskcipher(struct lskcipher_alg *alg)
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{
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crypto_unregister_alg(&alg->co.base);
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}
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EXPORT_SYMBOL_GPL(crypto_unregister_lskcipher);
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int crypto_register_lskciphers(struct lskcipher_alg *algs, int count)
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{
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int i, ret;
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for (i = 0; i < count; i++) {
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ret = crypto_register_lskcipher(&algs[i]);
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if (ret)
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goto err;
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}
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return 0;
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err:
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for (--i; i >= 0; --i)
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crypto_unregister_lskcipher(&algs[i]);
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return ret;
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}
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EXPORT_SYMBOL_GPL(crypto_register_lskciphers);
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void crypto_unregister_lskciphers(struct lskcipher_alg *algs, int count)
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{
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int i;
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for (i = count - 1; i >= 0; --i)
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crypto_unregister_lskcipher(&algs[i]);
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}
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EXPORT_SYMBOL_GPL(crypto_unregister_lskciphers);
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int lskcipher_register_instance(struct crypto_template *tmpl,
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struct lskcipher_instance *inst)
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{
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int err;
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if (WARN_ON(!inst->free))
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return -EINVAL;
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err = lskcipher_prepare_alg(&inst->alg);
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if (err)
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return err;
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return crypto_register_instance(tmpl, lskcipher_crypto_instance(inst));
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}
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EXPORT_SYMBOL_GPL(lskcipher_register_instance);
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static int lskcipher_setkey_simple(struct crypto_lskcipher *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct crypto_lskcipher *cipher = lskcipher_cipher_simple(tfm);
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crypto_lskcipher_clear_flags(cipher, CRYPTO_TFM_REQ_MASK);
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crypto_lskcipher_set_flags(cipher, crypto_lskcipher_get_flags(tfm) &
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CRYPTO_TFM_REQ_MASK);
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return crypto_lskcipher_setkey(cipher, key, keylen);
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}
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static int lskcipher_init_tfm_simple(struct crypto_lskcipher *tfm)
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{
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struct lskcipher_instance *inst = lskcipher_alg_instance(tfm);
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struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm);
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struct crypto_lskcipher_spawn *spawn;
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struct crypto_lskcipher *cipher;
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spawn = lskcipher_instance_ctx(inst);
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cipher = crypto_spawn_lskcipher(spawn);
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if (IS_ERR(cipher))
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return PTR_ERR(cipher);
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*ctx = cipher;
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return 0;
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}
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static void lskcipher_exit_tfm_simple(struct crypto_lskcipher *tfm)
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{
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struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm);
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crypto_free_lskcipher(*ctx);
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}
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static void lskcipher_free_instance_simple(struct lskcipher_instance *inst)
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{
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crypto_drop_lskcipher(lskcipher_instance_ctx(inst));
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kfree(inst);
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}
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/**
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* lskcipher_alloc_instance_simple - allocate instance of simple block cipher
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*
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* Allocate an lskcipher_instance for a simple block cipher mode of operation,
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* e.g. cbc or ecb. The instance context will have just a single crypto_spawn,
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* that for the underlying cipher. The {min,max}_keysize, ivsize, blocksize,
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* alignmask, and priority are set from the underlying cipher but can be
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* overridden if needed. The tfm context defaults to
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* struct crypto_lskcipher *, and default ->setkey(), ->init(), and
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* ->exit() methods are installed.
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*
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* @tmpl: the template being instantiated
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* @tb: the template parameters
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*
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* Return: a pointer to the new instance, or an ERR_PTR(). The caller still
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* needs to register the instance.
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*/
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struct lskcipher_instance *lskcipher_alloc_instance_simple(
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struct crypto_template *tmpl, struct rtattr **tb)
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{
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u32 mask;
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struct lskcipher_instance *inst;
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struct crypto_lskcipher_spawn *spawn;
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char ecb_name[CRYPTO_MAX_ALG_NAME];
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struct lskcipher_alg *cipher_alg;
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const char *cipher_name;
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int err;
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err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_LSKCIPHER, &mask);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
|
|
cipher_name = crypto_attr_alg_name(tb[1]);
|
|
if (IS_ERR(cipher_name))
|
|
return ERR_CAST(cipher_name);
|
|
|
|
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
|
|
if (!inst)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
spawn = lskcipher_instance_ctx(inst);
|
|
err = crypto_grab_lskcipher(spawn,
|
|
lskcipher_crypto_instance(inst),
|
|
cipher_name, 0, mask);
|
|
|
|
ecb_name[0] = 0;
|
|
if (err == -ENOENT && !!memcmp(tmpl->name, "ecb", 4)) {
|
|
err = -ENAMETOOLONG;
|
|
if (snprintf(ecb_name, CRYPTO_MAX_ALG_NAME, "ecb(%s)",
|
|
cipher_name) >= CRYPTO_MAX_ALG_NAME)
|
|
goto err_free_inst;
|
|
|
|
err = crypto_grab_lskcipher(spawn,
|
|
lskcipher_crypto_instance(inst),
|
|
ecb_name, 0, mask);
|
|
}
|
|
|
|
if (err)
|
|
goto err_free_inst;
|
|
|
|
cipher_alg = crypto_lskcipher_spawn_alg(spawn);
|
|
|
|
err = crypto_inst_setname(lskcipher_crypto_instance(inst), tmpl->name,
|
|
&cipher_alg->co.base);
|
|
if (err)
|
|
goto err_free_inst;
|
|
|
|
if (ecb_name[0]) {
|
|
int len;
|
|
|
|
err = -EINVAL;
|
|
len = strscpy(ecb_name, &cipher_alg->co.base.cra_name[4],
|
|
sizeof(ecb_name));
|
|
if (len < 2)
|
|
goto err_free_inst;
|
|
|
|
if (ecb_name[len - 1] != ')')
|
|
goto err_free_inst;
|
|
|
|
ecb_name[len - 1] = 0;
|
|
|
|
err = -ENAMETOOLONG;
|
|
if (snprintf(inst->alg.co.base.cra_name, CRYPTO_MAX_ALG_NAME,
|
|
"%s(%s)", tmpl->name, ecb_name) >=
|
|
CRYPTO_MAX_ALG_NAME)
|
|
goto err_free_inst;
|
|
|
|
if (strcmp(ecb_name, cipher_name) &&
|
|
snprintf(inst->alg.co.base.cra_driver_name,
|
|
CRYPTO_MAX_ALG_NAME,
|
|
"%s(%s)", tmpl->name, cipher_name) >=
|
|
CRYPTO_MAX_ALG_NAME)
|
|
goto err_free_inst;
|
|
} else {
|
|
/* Don't allow nesting. */
|
|
err = -ELOOP;
|
|
if ((cipher_alg->co.base.cra_flags & CRYPTO_ALG_INSTANCE))
|
|
goto err_free_inst;
|
|
}
|
|
|
|
err = -EINVAL;
|
|
if (cipher_alg->co.ivsize)
|
|
goto err_free_inst;
|
|
|
|
inst->free = lskcipher_free_instance_simple;
|
|
|
|
/* Default algorithm properties, can be overridden */
|
|
inst->alg.co.base.cra_blocksize = cipher_alg->co.base.cra_blocksize;
|
|
inst->alg.co.base.cra_alignmask = cipher_alg->co.base.cra_alignmask;
|
|
inst->alg.co.base.cra_priority = cipher_alg->co.base.cra_priority;
|
|
inst->alg.co.min_keysize = cipher_alg->co.min_keysize;
|
|
inst->alg.co.max_keysize = cipher_alg->co.max_keysize;
|
|
inst->alg.co.ivsize = cipher_alg->co.base.cra_blocksize;
|
|
inst->alg.co.statesize = cipher_alg->co.statesize;
|
|
|
|
/* Use struct crypto_lskcipher * by default, can be overridden */
|
|
inst->alg.co.base.cra_ctxsize = sizeof(struct crypto_lskcipher *);
|
|
inst->alg.setkey = lskcipher_setkey_simple;
|
|
inst->alg.init = lskcipher_init_tfm_simple;
|
|
inst->alg.exit = lskcipher_exit_tfm_simple;
|
|
|
|
return inst;
|
|
|
|
err_free_inst:
|
|
lskcipher_free_instance_simple(inst);
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL_GPL(lskcipher_alloc_instance_simple);
|