435 lines
11 KiB
C
435 lines
11 KiB
C
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/*
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* Copyright (c) 2010-2014, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/types.h>
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#include <crypto/aes.h>
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#include <crypto/des.h>
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#include <crypto/internal/skcipher.h>
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#include "cipher.h"
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static LIST_HEAD(ablkcipher_algs);
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static void qce_ablkcipher_done(void *data)
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{
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struct crypto_async_request *async_req = data;
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struct ablkcipher_request *req = ablkcipher_request_cast(async_req);
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struct qce_cipher_reqctx *rctx = ablkcipher_request_ctx(req);
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struct qce_alg_template *tmpl = to_cipher_tmpl(async_req->tfm);
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struct qce_device *qce = tmpl->qce;
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enum dma_data_direction dir_src, dir_dst;
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u32 status;
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int error;
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bool diff_dst;
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diff_dst = (req->src != req->dst) ? true : false;
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dir_src = diff_dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL;
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dir_dst = diff_dst ? DMA_FROM_DEVICE : DMA_BIDIRECTIONAL;
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error = qce_dma_terminate_all(&qce->dma);
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if (error)
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dev_dbg(qce->dev, "ablkcipher dma termination error (%d)\n",
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error);
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if (diff_dst)
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dma_unmap_sg(qce->dev, rctx->src_sg, rctx->src_nents, dir_src);
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dma_unmap_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
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sg_free_table(&rctx->dst_tbl);
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error = qce_check_status(qce, &status);
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if (error < 0)
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dev_dbg(qce->dev, "ablkcipher operation error (%x)\n", status);
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qce->async_req_done(tmpl->qce, error);
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}
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static int
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qce_ablkcipher_async_req_handle(struct crypto_async_request *async_req)
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{
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struct ablkcipher_request *req = ablkcipher_request_cast(async_req);
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struct qce_cipher_reqctx *rctx = ablkcipher_request_ctx(req);
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struct crypto_ablkcipher *ablkcipher = crypto_ablkcipher_reqtfm(req);
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struct qce_alg_template *tmpl = to_cipher_tmpl(async_req->tfm);
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struct qce_device *qce = tmpl->qce;
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enum dma_data_direction dir_src, dir_dst;
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struct scatterlist *sg;
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bool diff_dst;
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gfp_t gfp;
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int ret;
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rctx->iv = req->info;
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rctx->ivsize = crypto_ablkcipher_ivsize(ablkcipher);
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rctx->cryptlen = req->nbytes;
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diff_dst = (req->src != req->dst) ? true : false;
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dir_src = diff_dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL;
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dir_dst = diff_dst ? DMA_FROM_DEVICE : DMA_BIDIRECTIONAL;
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rctx->src_nents = sg_nents_for_len(req->src, req->nbytes);
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if (diff_dst)
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rctx->dst_nents = sg_nents_for_len(req->dst, req->nbytes);
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else
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rctx->dst_nents = rctx->src_nents;
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if (rctx->src_nents < 0) {
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dev_err(qce->dev, "Invalid numbers of src SG.\n");
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return rctx->src_nents;
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}
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if (rctx->dst_nents < 0) {
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dev_err(qce->dev, "Invalid numbers of dst SG.\n");
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return -rctx->dst_nents;
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}
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rctx->dst_nents += 1;
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gfp = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
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GFP_KERNEL : GFP_ATOMIC;
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ret = sg_alloc_table(&rctx->dst_tbl, rctx->dst_nents, gfp);
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if (ret)
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return ret;
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sg_init_one(&rctx->result_sg, qce->dma.result_buf, QCE_RESULT_BUF_SZ);
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sg = qce_sgtable_add(&rctx->dst_tbl, req->dst);
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if (IS_ERR(sg)) {
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ret = PTR_ERR(sg);
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goto error_free;
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}
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sg = qce_sgtable_add(&rctx->dst_tbl, &rctx->result_sg);
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if (IS_ERR(sg)) {
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ret = PTR_ERR(sg);
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goto error_free;
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}
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sg_mark_end(sg);
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rctx->dst_sg = rctx->dst_tbl.sgl;
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ret = dma_map_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
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if (ret < 0)
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goto error_free;
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if (diff_dst) {
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ret = dma_map_sg(qce->dev, req->src, rctx->src_nents, dir_src);
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if (ret < 0)
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goto error_unmap_dst;
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rctx->src_sg = req->src;
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} else {
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rctx->src_sg = rctx->dst_sg;
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}
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ret = qce_dma_prep_sgs(&qce->dma, rctx->src_sg, rctx->src_nents,
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rctx->dst_sg, rctx->dst_nents,
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qce_ablkcipher_done, async_req);
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if (ret)
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goto error_unmap_src;
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qce_dma_issue_pending(&qce->dma);
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ret = qce_start(async_req, tmpl->crypto_alg_type, req->nbytes, 0);
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if (ret)
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goto error_terminate;
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return 0;
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error_terminate:
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qce_dma_terminate_all(&qce->dma);
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error_unmap_src:
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if (diff_dst)
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dma_unmap_sg(qce->dev, req->src, rctx->src_nents, dir_src);
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error_unmap_dst:
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dma_unmap_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
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error_free:
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sg_free_table(&rctx->dst_tbl);
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return ret;
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}
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static int qce_ablkcipher_setkey(struct crypto_ablkcipher *ablk, const u8 *key,
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unsigned int keylen)
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{
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struct crypto_tfm *tfm = crypto_ablkcipher_tfm(ablk);
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struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
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unsigned long flags = to_cipher_tmpl(tfm)->alg_flags;
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int ret;
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if (!key || !keylen)
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return -EINVAL;
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if (IS_AES(flags)) {
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switch (keylen) {
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case AES_KEYSIZE_128:
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case AES_KEYSIZE_256:
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break;
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default:
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goto fallback;
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}
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} else if (IS_DES(flags)) {
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u32 tmp[DES_EXPKEY_WORDS];
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ret = des_ekey(tmp, key);
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if (!ret && crypto_ablkcipher_get_flags(ablk) &
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CRYPTO_TFM_REQ_WEAK_KEY)
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goto weakkey;
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}
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ctx->enc_keylen = keylen;
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memcpy(ctx->enc_key, key, keylen);
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return 0;
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fallback:
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ret = crypto_skcipher_setkey(ctx->fallback, key, keylen);
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if (!ret)
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ctx->enc_keylen = keylen;
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return ret;
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weakkey:
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crypto_ablkcipher_set_flags(ablk, CRYPTO_TFM_RES_WEAK_KEY);
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return -EINVAL;
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}
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static int qce_ablkcipher_crypt(struct ablkcipher_request *req, int encrypt)
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{
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struct crypto_tfm *tfm =
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crypto_ablkcipher_tfm(crypto_ablkcipher_reqtfm(req));
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struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
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struct qce_cipher_reqctx *rctx = ablkcipher_request_ctx(req);
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struct qce_alg_template *tmpl = to_cipher_tmpl(tfm);
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int ret;
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rctx->flags = tmpl->alg_flags;
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rctx->flags |= encrypt ? QCE_ENCRYPT : QCE_DECRYPT;
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if (IS_AES(rctx->flags) && ctx->enc_keylen != AES_KEYSIZE_128 &&
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ctx->enc_keylen != AES_KEYSIZE_256) {
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SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback);
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skcipher_request_set_tfm(subreq, ctx->fallback);
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skcipher_request_set_callback(subreq, req->base.flags,
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NULL, NULL);
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skcipher_request_set_crypt(subreq, req->src, req->dst,
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req->nbytes, req->info);
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ret = encrypt ? crypto_skcipher_encrypt(subreq) :
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crypto_skcipher_decrypt(subreq);
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skcipher_request_zero(subreq);
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return ret;
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}
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return tmpl->qce->async_req_enqueue(tmpl->qce, &req->base);
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}
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static int qce_ablkcipher_encrypt(struct ablkcipher_request *req)
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{
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return qce_ablkcipher_crypt(req, 1);
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}
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static int qce_ablkcipher_decrypt(struct ablkcipher_request *req)
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{
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return qce_ablkcipher_crypt(req, 0);
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}
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static int qce_ablkcipher_init(struct crypto_tfm *tfm)
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{
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struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
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memset(ctx, 0, sizeof(*ctx));
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tfm->crt_ablkcipher.reqsize = sizeof(struct qce_cipher_reqctx);
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ctx->fallback = crypto_alloc_skcipher(crypto_tfm_alg_name(tfm), 0,
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CRYPTO_ALG_ASYNC |
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CRYPTO_ALG_NEED_FALLBACK);
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if (IS_ERR(ctx->fallback))
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return PTR_ERR(ctx->fallback);
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return 0;
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}
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static void qce_ablkcipher_exit(struct crypto_tfm *tfm)
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{
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struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
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crypto_free_skcipher(ctx->fallback);
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}
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struct qce_ablkcipher_def {
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unsigned long flags;
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const char *name;
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const char *drv_name;
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unsigned int blocksize;
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unsigned int ivsize;
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unsigned int min_keysize;
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unsigned int max_keysize;
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};
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static const struct qce_ablkcipher_def ablkcipher_def[] = {
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{
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.flags = QCE_ALG_AES | QCE_MODE_ECB,
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.name = "ecb(aes)",
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.drv_name = "ecb-aes-qce",
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.blocksize = AES_BLOCK_SIZE,
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.ivsize = AES_BLOCK_SIZE,
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.min_keysize = AES_MIN_KEY_SIZE,
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.max_keysize = AES_MAX_KEY_SIZE,
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},
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{
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.flags = QCE_ALG_AES | QCE_MODE_CBC,
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.name = "cbc(aes)",
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.drv_name = "cbc-aes-qce",
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.blocksize = AES_BLOCK_SIZE,
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.ivsize = AES_BLOCK_SIZE,
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.min_keysize = AES_MIN_KEY_SIZE,
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.max_keysize = AES_MAX_KEY_SIZE,
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},
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{
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.flags = QCE_ALG_AES | QCE_MODE_CTR,
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.name = "ctr(aes)",
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.drv_name = "ctr-aes-qce",
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.blocksize = AES_BLOCK_SIZE,
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.ivsize = AES_BLOCK_SIZE,
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.min_keysize = AES_MIN_KEY_SIZE,
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.max_keysize = AES_MAX_KEY_SIZE,
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},
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{
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.flags = QCE_ALG_AES | QCE_MODE_XTS,
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.name = "xts(aes)",
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.drv_name = "xts-aes-qce",
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.blocksize = AES_BLOCK_SIZE,
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.ivsize = AES_BLOCK_SIZE,
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.min_keysize = AES_MIN_KEY_SIZE,
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.max_keysize = AES_MAX_KEY_SIZE,
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},
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{
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.flags = QCE_ALG_DES | QCE_MODE_ECB,
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.name = "ecb(des)",
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.drv_name = "ecb-des-qce",
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.blocksize = DES_BLOCK_SIZE,
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.ivsize = 0,
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.min_keysize = DES_KEY_SIZE,
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.max_keysize = DES_KEY_SIZE,
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},
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{
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.flags = QCE_ALG_DES | QCE_MODE_CBC,
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.name = "cbc(des)",
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.drv_name = "cbc-des-qce",
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.blocksize = DES_BLOCK_SIZE,
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.ivsize = DES_BLOCK_SIZE,
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.min_keysize = DES_KEY_SIZE,
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.max_keysize = DES_KEY_SIZE,
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},
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{
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.flags = QCE_ALG_3DES | QCE_MODE_ECB,
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.name = "ecb(des3_ede)",
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.drv_name = "ecb-3des-qce",
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.blocksize = DES3_EDE_BLOCK_SIZE,
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.ivsize = 0,
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.min_keysize = DES3_EDE_KEY_SIZE,
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.max_keysize = DES3_EDE_KEY_SIZE,
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},
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{
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.flags = QCE_ALG_3DES | QCE_MODE_CBC,
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.name = "cbc(des3_ede)",
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.drv_name = "cbc-3des-qce",
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.blocksize = DES3_EDE_BLOCK_SIZE,
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.ivsize = DES3_EDE_BLOCK_SIZE,
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.min_keysize = DES3_EDE_KEY_SIZE,
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.max_keysize = DES3_EDE_KEY_SIZE,
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},
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};
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static int qce_ablkcipher_register_one(const struct qce_ablkcipher_def *def,
|
||
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struct qce_device *qce)
|
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{
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|
struct qce_alg_template *tmpl;
|
||
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struct crypto_alg *alg;
|
||
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int ret;
|
||
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|
|
||
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tmpl = kzalloc(sizeof(*tmpl), GFP_KERNEL);
|
||
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if (!tmpl)
|
||
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return -ENOMEM;
|
||
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|
||
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alg = &tmpl->alg.crypto;
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||
|
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||
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snprintf(alg->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
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snprintf(alg->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
|
||
|
|
def->drv_name);
|
||
|
|
|
||
|
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alg->cra_blocksize = def->blocksize;
|
||
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alg->cra_ablkcipher.ivsize = def->ivsize;
|
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alg->cra_ablkcipher.min_keysize = def->min_keysize;
|
||
|
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alg->cra_ablkcipher.max_keysize = def->max_keysize;
|
||
|
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alg->cra_ablkcipher.setkey = qce_ablkcipher_setkey;
|
||
|
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alg->cra_ablkcipher.encrypt = qce_ablkcipher_encrypt;
|
||
|
|
alg->cra_ablkcipher.decrypt = qce_ablkcipher_decrypt;
|
||
|
|
|
||
|
|
alg->cra_priority = 300;
|
||
|
|
alg->cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC |
|
||
|
|
CRYPTO_ALG_NEED_FALLBACK;
|
||
|
|
alg->cra_ctxsize = sizeof(struct qce_cipher_ctx);
|
||
|
|
alg->cra_alignmask = 0;
|
||
|
|
alg->cra_type = &crypto_ablkcipher_type;
|
||
|
|
alg->cra_module = THIS_MODULE;
|
||
|
|
alg->cra_init = qce_ablkcipher_init;
|
||
|
|
alg->cra_exit = qce_ablkcipher_exit;
|
||
|
|
INIT_LIST_HEAD(&alg->cra_list);
|
||
|
|
|
||
|
|
INIT_LIST_HEAD(&tmpl->entry);
|
||
|
|
tmpl->crypto_alg_type = CRYPTO_ALG_TYPE_ABLKCIPHER;
|
||
|
|
tmpl->alg_flags = def->flags;
|
||
|
|
tmpl->qce = qce;
|
||
|
|
|
||
|
|
ret = crypto_register_alg(alg);
|
||
|
|
if (ret) {
|
||
|
|
kfree(tmpl);
|
||
|
|
dev_err(qce->dev, "%s registration failed\n", alg->cra_name);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
list_add_tail(&tmpl->entry, &ablkcipher_algs);
|
||
|
|
dev_dbg(qce->dev, "%s is registered\n", alg->cra_name);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void qce_ablkcipher_unregister(struct qce_device *qce)
|
||
|
|
{
|
||
|
|
struct qce_alg_template *tmpl, *n;
|
||
|
|
|
||
|
|
list_for_each_entry_safe(tmpl, n, &ablkcipher_algs, entry) {
|
||
|
|
crypto_unregister_alg(&tmpl->alg.crypto);
|
||
|
|
list_del(&tmpl->entry);
|
||
|
|
kfree(tmpl);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int qce_ablkcipher_register(struct qce_device *qce)
|
||
|
|
{
|
||
|
|
int ret, i;
|
||
|
|
|
||
|
|
for (i = 0; i < ARRAY_SIZE(ablkcipher_def); i++) {
|
||
|
|
ret = qce_ablkcipher_register_one(&ablkcipher_def[i], qce);
|
||
|
|
if (ret)
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
err:
|
||
|
|
qce_ablkcipher_unregister(qce);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
const struct qce_algo_ops ablkcipher_ops = {
|
||
|
|
.type = CRYPTO_ALG_TYPE_ABLKCIPHER,
|
||
|
|
.register_algs = qce_ablkcipher_register,
|
||
|
|
.unregister_algs = qce_ablkcipher_unregister,
|
||
|
|
.async_req_handle = qce_ablkcipher_async_req_handle,
|
||
|
|
};
|