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-rw-r--r--crypto/chainiv.c317
1 files changed, 0 insertions, 317 deletions
diff --git a/crypto/chainiv.c b/crypto/chainiv.c
deleted file mode 100644
index b434001..0000000
--- a/crypto/chainiv.c
+++ /dev/null
@@ -1,317 +0,0 @@
-/*
- * chainiv: Chain IV Generator
- *
- * Generate IVs simply be using the last block of the previous encryption.
- * This is mainly useful for CBC with a synchronous algorithm.
- *
- * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- */
-
-#include <crypto/internal/skcipher.h>
-#include <crypto/rng.h>
-#include <crypto/crypto_wq.h>
-#include <linux/err.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/spinlock.h>
-#include <linux/string.h>
-#include <linux/workqueue.h>
-
-enum {
- CHAINIV_STATE_INUSE = 0,
-};
-
-struct chainiv_ctx {
- spinlock_t lock;
- char iv[];
-};
-
-struct async_chainiv_ctx {
- unsigned long state;
-
- spinlock_t lock;
- int err;
-
- struct crypto_queue queue;
- struct work_struct postponed;
-
- char iv[];
-};
-
-static int chainiv_givencrypt(struct skcipher_givcrypt_request *req)
-{
- struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
- struct chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
- struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
- unsigned int ivsize;
- int err;
-
- ablkcipher_request_set_tfm(subreq, skcipher_geniv_cipher(geniv));
- ablkcipher_request_set_callback(subreq, req->creq.base.flags &
- ~CRYPTO_TFM_REQ_MAY_SLEEP,
- req->creq.base.complete,
- req->creq.base.data);
- ablkcipher_request_set_crypt(subreq, req->creq.src, req->creq.dst,
- req->creq.nbytes, req->creq.info);
-
- spin_lock_bh(&ctx->lock);
-
- ivsize = crypto_ablkcipher_ivsize(geniv);
-
- memcpy(req->giv, ctx->iv, ivsize);
- memcpy(subreq->info, ctx->iv, ivsize);
-
- err = crypto_ablkcipher_encrypt(subreq);
- if (err)
- goto unlock;
-
- memcpy(ctx->iv, subreq->info, ivsize);
-
-unlock:
- spin_unlock_bh(&ctx->lock);
-
- return err;
-}
-
-static int chainiv_init_common(struct crypto_tfm *tfm, char iv[])
-{
- struct crypto_ablkcipher *geniv = __crypto_ablkcipher_cast(tfm);
- int err = 0;
-
- tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request);
-
- if (iv) {
- err = crypto_rng_get_bytes(crypto_default_rng, iv,
- crypto_ablkcipher_ivsize(geniv));
- crypto_put_default_rng();
- }
-
- return err ?: skcipher_geniv_init(tfm);
-}
-
-static int chainiv_init(struct crypto_tfm *tfm)
-{
- struct crypto_ablkcipher *geniv = __crypto_ablkcipher_cast(tfm);
- struct chainiv_ctx *ctx = crypto_tfm_ctx(tfm);
- char *iv;
-
- spin_lock_init(&ctx->lock);
-
- iv = NULL;
- if (!crypto_get_default_rng()) {
- crypto_ablkcipher_crt(geniv)->givencrypt = chainiv_givencrypt;
- iv = ctx->iv;
- }
-
- return chainiv_init_common(tfm, iv);
-}
-
-static int async_chainiv_schedule_work(struct async_chainiv_ctx *ctx)
-{
- int queued;
- int err = ctx->err;
-
- if (!ctx->queue.qlen) {
- smp_mb__before_atomic();
- clear_bit(CHAINIV_STATE_INUSE, &ctx->state);
-
- if (!ctx->queue.qlen ||
- test_and_set_bit(CHAINIV_STATE_INUSE, &ctx->state))
- goto out;
- }
-
- queued = queue_work(kcrypto_wq, &ctx->postponed);
- BUG_ON(!queued);
-
-out:
- return err;
-}
-
-static int async_chainiv_postpone_request(struct skcipher_givcrypt_request *req)
-{
- struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
- struct async_chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
- int err;
-
- spin_lock_bh(&ctx->lock);
- err = skcipher_enqueue_givcrypt(&ctx->queue, req);
- spin_unlock_bh(&ctx->lock);
-
- if (test_and_set_bit(CHAINIV_STATE_INUSE, &ctx->state))
- return err;
-
- ctx->err = err;
- return async_chainiv_schedule_work(ctx);
-}
-
-static int async_chainiv_givencrypt_tail(struct skcipher_givcrypt_request *req)
-{
- struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
- struct async_chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
- struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
- unsigned int ivsize = crypto_ablkcipher_ivsize(geniv);
-
- memcpy(req->giv, ctx->iv, ivsize);
- memcpy(subreq->info, ctx->iv, ivsize);
-
- ctx->err = crypto_ablkcipher_encrypt(subreq);
- if (ctx->err)
- goto out;
-
- memcpy(ctx->iv, subreq->info, ivsize);
-
-out:
- return async_chainiv_schedule_work(ctx);
-}
-
-static int async_chainiv_givencrypt(struct skcipher_givcrypt_request *req)
-{
- struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
- struct async_chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
- struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
-
- ablkcipher_request_set_tfm(subreq, skcipher_geniv_cipher(geniv));
- ablkcipher_request_set_callback(subreq, req->creq.base.flags,
- req->creq.base.complete,
- req->creq.base.data);
- ablkcipher_request_set_crypt(subreq, req->creq.src, req->creq.dst,
- req->creq.nbytes, req->creq.info);
-
- if (test_and_set_bit(CHAINIV_STATE_INUSE, &ctx->state))
- goto postpone;
-
- if (ctx->queue.qlen) {
- clear_bit(CHAINIV_STATE_INUSE, &ctx->state);
- goto postpone;
- }
-
- return async_chainiv_givencrypt_tail(req);
-
-postpone:
- return async_chainiv_postpone_request(req);
-}
-
-static void async_chainiv_do_postponed(struct work_struct *work)
-{
- struct async_chainiv_ctx *ctx = container_of(work,
- struct async_chainiv_ctx,
- postponed);
- struct skcipher_givcrypt_request *req;
- struct ablkcipher_request *subreq;
- int err;
-
- /* Only handle one request at a time to avoid hogging keventd. */
- spin_lock_bh(&ctx->lock);
- req = skcipher_dequeue_givcrypt(&ctx->queue);
- spin_unlock_bh(&ctx->lock);
-
- if (!req) {
- async_chainiv_schedule_work(ctx);
- return;
- }
-
- subreq = skcipher_givcrypt_reqctx(req);
- subreq->base.flags |= CRYPTO_TFM_REQ_MAY_SLEEP;
-
- err = async_chainiv_givencrypt_tail(req);
-
- local_bh_disable();
- skcipher_givcrypt_complete(req, err);
- local_bh_enable();
-}
-
-static int async_chainiv_init(struct crypto_tfm *tfm)
-{
- struct crypto_ablkcipher *geniv = __crypto_ablkcipher_cast(tfm);
- struct async_chainiv_ctx *ctx = crypto_tfm_ctx(tfm);
- char *iv;
-
- spin_lock_init(&ctx->lock);
-
- crypto_init_queue(&ctx->queue, 100);
- INIT_WORK(&ctx->postponed, async_chainiv_do_postponed);
-
- iv = NULL;
- if (!crypto_get_default_rng()) {
- crypto_ablkcipher_crt(geniv)->givencrypt =
- async_chainiv_givencrypt;
- iv = ctx->iv;
- }
-
- return chainiv_init_common(tfm, iv);
-}
-
-static void async_chainiv_exit(struct crypto_tfm *tfm)
-{
- struct async_chainiv_ctx *ctx = crypto_tfm_ctx(tfm);
-
- BUG_ON(test_bit(CHAINIV_STATE_INUSE, &ctx->state) || ctx->queue.qlen);
-
- skcipher_geniv_exit(tfm);
-}
-
-static struct crypto_template chainiv_tmpl;
-
-static struct crypto_instance *chainiv_alloc(struct rtattr **tb)
-{
- struct crypto_attr_type *algt;
- struct crypto_instance *inst;
-
- algt = crypto_get_attr_type(tb);
- if (IS_ERR(algt))
- return ERR_CAST(algt);
-
- inst = skcipher_geniv_alloc(&chainiv_tmpl, tb, 0, 0);
- if (IS_ERR(inst))
- goto out;
-
- inst->alg.cra_init = chainiv_init;
- inst->alg.cra_exit = skcipher_geniv_exit;
-
- inst->alg.cra_ctxsize = sizeof(struct chainiv_ctx);
-
- if (!crypto_requires_sync(algt->type, algt->mask)) {
- inst->alg.cra_flags |= CRYPTO_ALG_ASYNC;
-
- inst->alg.cra_init = async_chainiv_init;
- inst->alg.cra_exit = async_chainiv_exit;
-
- inst->alg.cra_ctxsize = sizeof(struct async_chainiv_ctx);
- }
-
- inst->alg.cra_ctxsize += inst->alg.cra_ablkcipher.ivsize;
-
-out:
- return inst;
-}
-
-static struct crypto_template chainiv_tmpl = {
- .name = "chainiv",
- .alloc = chainiv_alloc,
- .free = skcipher_geniv_free,
- .module = THIS_MODULE,
-};
-
-static int __init chainiv_module_init(void)
-{
- return crypto_register_template(&chainiv_tmpl);
-}
-
-static void chainiv_module_exit(void)
-{
- crypto_unregister_template(&chainiv_tmpl);
-}
-
-module_init(chainiv_module_init);
-module_exit(chainiv_module_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("Chain IV Generator");
-MODULE_ALIAS_CRYPTO("chainiv");
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