476 lines
12 KiB
C
476 lines
12 KiB
C
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/*
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* CTR: Counter mode
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*
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* (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <crypto/algapi.h>
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#include <crypto/ctr.h>
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#include <crypto/internal/skcipher.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/random.h>
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#include <linux/scatterlist.h>
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#include <linux/slab.h>
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struct crypto_ctr_ctx {
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struct crypto_cipher *child;
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};
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struct crypto_rfc3686_ctx {
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struct crypto_skcipher *child;
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u8 nonce[CTR_RFC3686_NONCE_SIZE];
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};
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struct crypto_rfc3686_req_ctx {
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u8 iv[CTR_RFC3686_BLOCK_SIZE];
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struct skcipher_request subreq CRYPTO_MINALIGN_ATTR;
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};
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static int crypto_ctr_setkey(struct crypto_tfm *parent, const u8 *key,
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unsigned int keylen)
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{
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struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(parent);
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struct crypto_cipher *child = ctx->child;
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int err;
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crypto_cipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
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crypto_cipher_set_flags(child, crypto_tfm_get_flags(parent) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_cipher_setkey(child, key, keylen);
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crypto_tfm_set_flags(parent, crypto_cipher_get_flags(child) &
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CRYPTO_TFM_RES_MASK);
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return err;
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}
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static void crypto_ctr_crypt_final(struct blkcipher_walk *walk,
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struct crypto_cipher *tfm)
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{
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unsigned int bsize = crypto_cipher_blocksize(tfm);
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unsigned long alignmask = crypto_cipher_alignmask(tfm);
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u8 *ctrblk = walk->iv;
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u8 tmp[bsize + alignmask];
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u8 *keystream = PTR_ALIGN(tmp + 0, alignmask + 1);
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u8 *src = walk->src.virt.addr;
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u8 *dst = walk->dst.virt.addr;
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unsigned int nbytes = walk->nbytes;
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crypto_cipher_encrypt_one(tfm, keystream, ctrblk);
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crypto_xor(keystream, src, nbytes);
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memcpy(dst, keystream, nbytes);
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crypto_inc(ctrblk, bsize);
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}
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static int crypto_ctr_crypt_segment(struct blkcipher_walk *walk,
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struct crypto_cipher *tfm)
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{
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void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
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crypto_cipher_alg(tfm)->cia_encrypt;
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unsigned int bsize = crypto_cipher_blocksize(tfm);
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u8 *ctrblk = walk->iv;
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u8 *src = walk->src.virt.addr;
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u8 *dst = walk->dst.virt.addr;
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unsigned int nbytes = walk->nbytes;
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do {
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/* create keystream */
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fn(crypto_cipher_tfm(tfm), dst, ctrblk);
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crypto_xor(dst, src, bsize);
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/* increment counter in counterblock */
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crypto_inc(ctrblk, bsize);
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src += bsize;
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dst += bsize;
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} while ((nbytes -= bsize) >= bsize);
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return nbytes;
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}
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static int crypto_ctr_crypt_inplace(struct blkcipher_walk *walk,
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struct crypto_cipher *tfm)
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{
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void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
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crypto_cipher_alg(tfm)->cia_encrypt;
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unsigned int bsize = crypto_cipher_blocksize(tfm);
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unsigned long alignmask = crypto_cipher_alignmask(tfm);
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unsigned int nbytes = walk->nbytes;
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u8 *ctrblk = walk->iv;
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u8 *src = walk->src.virt.addr;
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u8 tmp[bsize + alignmask];
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u8 *keystream = PTR_ALIGN(tmp + 0, alignmask + 1);
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do {
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/* create keystream */
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fn(crypto_cipher_tfm(tfm), keystream, ctrblk);
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crypto_xor(src, keystream, bsize);
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/* increment counter in counterblock */
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crypto_inc(ctrblk, bsize);
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src += bsize;
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} while ((nbytes -= bsize) >= bsize);
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return nbytes;
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}
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static int crypto_ctr_crypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct blkcipher_walk walk;
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struct crypto_blkcipher *tfm = desc->tfm;
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struct crypto_ctr_ctx *ctx = crypto_blkcipher_ctx(tfm);
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struct crypto_cipher *child = ctx->child;
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unsigned int bsize = crypto_cipher_blocksize(child);
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt_block(desc, &walk, bsize);
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while (walk.nbytes >= bsize) {
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if (walk.src.virt.addr == walk.dst.virt.addr)
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nbytes = crypto_ctr_crypt_inplace(&walk, child);
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else
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nbytes = crypto_ctr_crypt_segment(&walk, child);
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err = blkcipher_walk_done(desc, &walk, nbytes);
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}
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if (walk.nbytes) {
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crypto_ctr_crypt_final(&walk, child);
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err = blkcipher_walk_done(desc, &walk, 0);
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}
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return err;
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}
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static int crypto_ctr_init_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_instance *inst = (void *)tfm->__crt_alg;
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struct crypto_spawn *spawn = crypto_instance_ctx(inst);
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struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
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struct crypto_cipher *cipher;
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cipher = crypto_spawn_cipher(spawn);
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if (IS_ERR(cipher))
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return PTR_ERR(cipher);
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ctx->child = cipher;
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return 0;
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}
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static void crypto_ctr_exit_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
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crypto_free_cipher(ctx->child);
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}
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static struct crypto_instance *crypto_ctr_alloc(struct rtattr **tb)
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{
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struct crypto_instance *inst;
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struct crypto_alg *alg;
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int err;
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err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
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if (err)
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return ERR_PTR(err);
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alg = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_CIPHER,
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CRYPTO_ALG_TYPE_MASK);
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if (IS_ERR(alg))
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return ERR_CAST(alg);
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/* Block size must be >= 4 bytes. */
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err = -EINVAL;
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if (alg->cra_blocksize < 4)
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goto out_put_alg;
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/* If this is false we'd fail the alignment of crypto_inc. */
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if (alg->cra_blocksize % 4)
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goto out_put_alg;
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inst = crypto_alloc_instance("ctr", alg);
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if (IS_ERR(inst))
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goto out;
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inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER;
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inst->alg.cra_priority = alg->cra_priority;
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inst->alg.cra_blocksize = 1;
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inst->alg.cra_alignmask = alg->cra_alignmask | (__alignof__(u32) - 1);
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inst->alg.cra_type = &crypto_blkcipher_type;
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inst->alg.cra_blkcipher.ivsize = alg->cra_blocksize;
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inst->alg.cra_blkcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
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inst->alg.cra_blkcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
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inst->alg.cra_ctxsize = sizeof(struct crypto_ctr_ctx);
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inst->alg.cra_init = crypto_ctr_init_tfm;
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inst->alg.cra_exit = crypto_ctr_exit_tfm;
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inst->alg.cra_blkcipher.setkey = crypto_ctr_setkey;
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inst->alg.cra_blkcipher.encrypt = crypto_ctr_crypt;
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inst->alg.cra_blkcipher.decrypt = crypto_ctr_crypt;
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inst->alg.cra_blkcipher.geniv = "chainiv";
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out:
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crypto_mod_put(alg);
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return inst;
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out_put_alg:
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inst = ERR_PTR(err);
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goto out;
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}
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static void crypto_ctr_free(struct crypto_instance *inst)
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{
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crypto_drop_spawn(crypto_instance_ctx(inst));
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kfree(inst);
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}
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static struct crypto_template crypto_ctr_tmpl = {
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.name = "ctr",
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.alloc = crypto_ctr_alloc,
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.free = crypto_ctr_free,
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.module = THIS_MODULE,
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};
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static int crypto_rfc3686_setkey(struct crypto_skcipher *parent,
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const u8 *key, unsigned int keylen)
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{
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struct crypto_rfc3686_ctx *ctx = crypto_skcipher_ctx(parent);
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struct crypto_skcipher *child = ctx->child;
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int err;
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/* the nonce is stored in bytes at end of key */
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if (keylen < CTR_RFC3686_NONCE_SIZE)
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return -EINVAL;
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memcpy(ctx->nonce, key + (keylen - CTR_RFC3686_NONCE_SIZE),
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CTR_RFC3686_NONCE_SIZE);
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keylen -= CTR_RFC3686_NONCE_SIZE;
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crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
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crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(parent) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_skcipher_setkey(child, key, keylen);
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crypto_skcipher_set_flags(parent, crypto_skcipher_get_flags(child) &
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CRYPTO_TFM_RES_MASK);
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return err;
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}
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static int crypto_rfc3686_crypt(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct crypto_rfc3686_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct crypto_skcipher *child = ctx->child;
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unsigned long align = crypto_skcipher_alignmask(tfm);
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struct crypto_rfc3686_req_ctx *rctx =
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(void *)PTR_ALIGN((u8 *)skcipher_request_ctx(req), align + 1);
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struct skcipher_request *subreq = &rctx->subreq;
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u8 *iv = rctx->iv;
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/* set up counter block */
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memcpy(iv, ctx->nonce, CTR_RFC3686_NONCE_SIZE);
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memcpy(iv + CTR_RFC3686_NONCE_SIZE, req->iv, CTR_RFC3686_IV_SIZE);
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/* initialize counter portion of counter block */
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*(__be32 *)(iv + CTR_RFC3686_NONCE_SIZE + CTR_RFC3686_IV_SIZE) =
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cpu_to_be32(1);
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skcipher_request_set_tfm(subreq, child);
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skcipher_request_set_callback(subreq, req->base.flags,
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req->base.complete, req->base.data);
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skcipher_request_set_crypt(subreq, req->src, req->dst,
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req->cryptlen, iv);
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return crypto_skcipher_encrypt(subreq);
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}
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static int crypto_rfc3686_init_tfm(struct crypto_skcipher *tfm)
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{
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struct skcipher_instance *inst = skcipher_alg_instance(tfm);
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struct crypto_skcipher_spawn *spawn = skcipher_instance_ctx(inst);
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struct crypto_rfc3686_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct crypto_skcipher *cipher;
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unsigned long align;
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unsigned int reqsize;
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cipher = crypto_spawn_skcipher2(spawn);
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if (IS_ERR(cipher))
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return PTR_ERR(cipher);
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ctx->child = cipher;
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align = crypto_skcipher_alignmask(tfm);
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align &= ~(crypto_tfm_ctx_alignment() - 1);
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reqsize = align + sizeof(struct crypto_rfc3686_req_ctx) +
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crypto_skcipher_reqsize(cipher);
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crypto_skcipher_set_reqsize(tfm, reqsize);
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return 0;
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}
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static void crypto_rfc3686_exit_tfm(struct crypto_skcipher *tfm)
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{
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struct crypto_rfc3686_ctx *ctx = crypto_skcipher_ctx(tfm);
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crypto_free_skcipher(ctx->child);
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}
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static void crypto_rfc3686_free(struct skcipher_instance *inst)
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{
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struct crypto_skcipher_spawn *spawn = skcipher_instance_ctx(inst);
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crypto_drop_skcipher(spawn);
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kfree(inst);
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}
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static int crypto_rfc3686_create(struct crypto_template *tmpl,
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struct rtattr **tb)
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{
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struct crypto_attr_type *algt;
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struct skcipher_instance *inst;
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struct skcipher_alg *alg;
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struct crypto_skcipher_spawn *spawn;
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const char *cipher_name;
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int err;
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algt = crypto_get_attr_type(tb);
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if (IS_ERR(algt))
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return PTR_ERR(algt);
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if ((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask)
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return -EINVAL;
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|
cipher_name = crypto_attr_alg_name(tb[1]);
|
||
|
|
if (IS_ERR(cipher_name))
|
||
|
|
return PTR_ERR(cipher_name);
|
||
|
|
|
||
|
|
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
|
||
|
|
if (!inst)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
spawn = skcipher_instance_ctx(inst);
|
||
|
|
|
||
|
|
crypto_set_skcipher_spawn(spawn, skcipher_crypto_instance(inst));
|
||
|
|
err = crypto_grab_skcipher2(spawn, cipher_name, 0,
|
||
|
|
crypto_requires_sync(algt->type,
|
||
|
|
algt->mask));
|
||
|
|
if (err)
|
||
|
|
goto err_free_inst;
|
||
|
|
|
||
|
|
alg = crypto_spawn_skcipher_alg(spawn);
|
||
|
|
|
||
|
|
/* We only support 16-byte blocks. */
|
||
|
|
err = -EINVAL;
|
||
|
|
if (crypto_skcipher_alg_ivsize(alg) != CTR_RFC3686_BLOCK_SIZE)
|
||
|
|
goto err_drop_spawn;
|
||
|
|
|
||
|
|
/* Not a stream cipher? */
|
||
|
|
if (alg->base.cra_blocksize != 1)
|
||
|
|
goto err_drop_spawn;
|
||
|
|
|
||
|
|
err = -ENAMETOOLONG;
|
||
|
|
if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
|
||
|
|
"rfc3686(%s)", alg->base.cra_name) >= CRYPTO_MAX_ALG_NAME)
|
||
|
|
goto err_drop_spawn;
|
||
|
|
if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
|
||
|
|
"rfc3686(%s)", alg->base.cra_driver_name) >=
|
||
|
|
CRYPTO_MAX_ALG_NAME)
|
||
|
|
goto err_drop_spawn;
|
||
|
|
|
||
|
|
inst->alg.base.cra_priority = alg->base.cra_priority;
|
||
|
|
inst->alg.base.cra_blocksize = 1;
|
||
|
|
inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
|
||
|
|
|
||
|
|
inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
|
||
|
|
|
||
|
|
inst->alg.ivsize = CTR_RFC3686_IV_SIZE;
|
||
|
|
inst->alg.chunksize = crypto_skcipher_alg_chunksize(alg);
|
||
|
|
inst->alg.min_keysize = crypto_skcipher_alg_min_keysize(alg) +
|
||
|
|
CTR_RFC3686_NONCE_SIZE;
|
||
|
|
inst->alg.max_keysize = crypto_skcipher_alg_max_keysize(alg) +
|
||
|
|
CTR_RFC3686_NONCE_SIZE;
|
||
|
|
|
||
|
|
inst->alg.setkey = crypto_rfc3686_setkey;
|
||
|
|
inst->alg.encrypt = crypto_rfc3686_crypt;
|
||
|
|
inst->alg.decrypt = crypto_rfc3686_crypt;
|
||
|
|
|
||
|
|
inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc3686_ctx);
|
||
|
|
|
||
|
|
inst->alg.init = crypto_rfc3686_init_tfm;
|
||
|
|
inst->alg.exit = crypto_rfc3686_exit_tfm;
|
||
|
|
|
||
|
|
inst->free = crypto_rfc3686_free;
|
||
|
|
|
||
|
|
err = skcipher_register_instance(tmpl, inst);
|
||
|
|
if (err)
|
||
|
|
goto err_drop_spawn;
|
||
|
|
|
||
|
|
out:
|
||
|
|
return err;
|
||
|
|
|
||
|
|
err_drop_spawn:
|
||
|
|
crypto_drop_skcipher(spawn);
|
||
|
|
err_free_inst:
|
||
|
|
kfree(inst);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct crypto_template crypto_rfc3686_tmpl = {
|
||
|
|
.name = "rfc3686",
|
||
|
|
.create = crypto_rfc3686_create,
|
||
|
|
.module = THIS_MODULE,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init crypto_ctr_module_init(void)
|
||
|
|
{
|
||
|
|
int err;
|
||
|
|
|
||
|
|
err = crypto_register_template(&crypto_ctr_tmpl);
|
||
|
|
if (err)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
err = crypto_register_template(&crypto_rfc3686_tmpl);
|
||
|
|
if (err)
|
||
|
|
goto out_drop_ctr;
|
||
|
|
|
||
|
|
out:
|
||
|
|
return err;
|
||
|
|
|
||
|
|
out_drop_ctr:
|
||
|
|
crypto_unregister_template(&crypto_ctr_tmpl);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit crypto_ctr_module_exit(void)
|
||
|
|
{
|
||
|
|
crypto_unregister_template(&crypto_rfc3686_tmpl);
|
||
|
|
crypto_unregister_template(&crypto_ctr_tmpl);
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(crypto_ctr_module_init);
|
||
|
|
module_exit(crypto_ctr_module_exit);
|
||
|
|
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_DESCRIPTION("CTR Counter block mode");
|
||
|
|
MODULE_ALIAS_CRYPTO("rfc3686");
|
||
|
|
MODULE_ALIAS_CRYPTO("ctr");
|