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![Eric Biggers](/assets/img/avatar_default.png)
Some crypto API users allocating a tfm with crypto_alloc_$FOO() are also specifying the type flags for $FOO, e.g. crypto_alloc_shash() with CRYPTO_ALG_TYPE_SHASH. But, that's redundant since the crypto API will override any specified type flag/mask with the correct ones. So, remove the unneeded flags. This patch shouldn't change any actual behavior. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
566 lines
15 KiB
C
566 lines
15 KiB
C
/*
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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 <crypto/internal/hash.h>
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#include "common.h"
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#include "core.h"
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#include "sha.h"
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/* crypto hw padding constant for first operation */
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#define SHA_PADDING 64
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#define SHA_PADDING_MASK (SHA_PADDING - 1)
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static LIST_HEAD(ahash_algs);
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static const u32 std_iv_sha1[SHA256_DIGEST_SIZE / sizeof(u32)] = {
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SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4, 0, 0, 0
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};
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static const u32 std_iv_sha256[SHA256_DIGEST_SIZE / sizeof(u32)] = {
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SHA256_H0, SHA256_H1, SHA256_H2, SHA256_H3,
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SHA256_H4, SHA256_H5, SHA256_H6, SHA256_H7
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};
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static void qce_ahash_done(void *data)
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{
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struct crypto_async_request *async_req = data;
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struct ahash_request *req = ahash_request_cast(async_req);
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struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);
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struct qce_sha_reqctx *rctx = ahash_request_ctx(req);
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struct qce_alg_template *tmpl = to_ahash_tmpl(async_req->tfm);
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struct qce_device *qce = tmpl->qce;
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struct qce_result_dump *result = qce->dma.result_buf;
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unsigned int digestsize = crypto_ahash_digestsize(ahash);
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int error;
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u32 status;
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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, "ahash dma termination error (%d)\n", error);
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dma_unmap_sg(qce->dev, req->src, rctx->src_nents, DMA_TO_DEVICE);
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dma_unmap_sg(qce->dev, &rctx->result_sg, 1, DMA_FROM_DEVICE);
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memcpy(rctx->digest, result->auth_iv, digestsize);
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if (req->result)
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memcpy(req->result, result->auth_iv, digestsize);
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rctx->byte_count[0] = cpu_to_be32(result->auth_byte_count[0]);
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rctx->byte_count[1] = cpu_to_be32(result->auth_byte_count[1]);
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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, "ahash operation error (%x)\n", status);
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req->src = rctx->src_orig;
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req->nbytes = rctx->nbytes_orig;
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rctx->last_blk = false;
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rctx->first_blk = false;
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qce->async_req_done(tmpl->qce, error);
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}
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static int qce_ahash_async_req_handle(struct crypto_async_request *async_req)
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{
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struct ahash_request *req = ahash_request_cast(async_req);
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struct qce_sha_reqctx *rctx = ahash_request_ctx(req);
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struct qce_sha_ctx *ctx = crypto_tfm_ctx(async_req->tfm);
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struct qce_alg_template *tmpl = to_ahash_tmpl(async_req->tfm);
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struct qce_device *qce = tmpl->qce;
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unsigned long flags = rctx->flags;
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int ret;
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if (IS_SHA_HMAC(flags)) {
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rctx->authkey = ctx->authkey;
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rctx->authklen = QCE_SHA_HMAC_KEY_SIZE;
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} else if (IS_CMAC(flags)) {
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rctx->authkey = ctx->authkey;
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rctx->authklen = AES_KEYSIZE_128;
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}
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rctx->src_nents = sg_nents_for_len(req->src, req->nbytes);
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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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ret = dma_map_sg(qce->dev, req->src, rctx->src_nents, DMA_TO_DEVICE);
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if (ret < 0)
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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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ret = dma_map_sg(qce->dev, &rctx->result_sg, 1, DMA_FROM_DEVICE);
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if (ret < 0)
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goto error_unmap_src;
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ret = qce_dma_prep_sgs(&qce->dma, req->src, rctx->src_nents,
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&rctx->result_sg, 1, qce_ahash_done, async_req);
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if (ret)
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goto error_unmap_dst;
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qce_dma_issue_pending(&qce->dma);
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ret = qce_start(async_req, tmpl->crypto_alg_type, 0, 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_dst:
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dma_unmap_sg(qce->dev, &rctx->result_sg, 1, DMA_FROM_DEVICE);
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error_unmap_src:
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dma_unmap_sg(qce->dev, req->src, rctx->src_nents, DMA_TO_DEVICE);
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return ret;
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}
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static int qce_ahash_init(struct ahash_request *req)
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{
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struct qce_sha_reqctx *rctx = ahash_request_ctx(req);
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struct qce_alg_template *tmpl = to_ahash_tmpl(req->base.tfm);
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const u32 *std_iv = tmpl->std_iv;
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memset(rctx, 0, sizeof(*rctx));
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rctx->first_blk = true;
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rctx->last_blk = false;
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rctx->flags = tmpl->alg_flags;
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memcpy(rctx->digest, std_iv, sizeof(rctx->digest));
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return 0;
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}
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static int qce_ahash_export(struct ahash_request *req, void *out)
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{
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struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);
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struct qce_sha_reqctx *rctx = ahash_request_ctx(req);
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unsigned long flags = rctx->flags;
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unsigned int digestsize = crypto_ahash_digestsize(ahash);
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unsigned int blocksize =
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crypto_tfm_alg_blocksize(crypto_ahash_tfm(ahash));
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if (IS_SHA1(flags) || IS_SHA1_HMAC(flags)) {
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struct sha1_state *out_state = out;
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out_state->count = rctx->count;
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qce_cpu_to_be32p_array((__be32 *)out_state->state,
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rctx->digest, digestsize);
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memcpy(out_state->buffer, rctx->buf, blocksize);
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} else if (IS_SHA256(flags) || IS_SHA256_HMAC(flags)) {
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struct sha256_state *out_state = out;
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out_state->count = rctx->count;
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qce_cpu_to_be32p_array((__be32 *)out_state->state,
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rctx->digest, digestsize);
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memcpy(out_state->buf, rctx->buf, blocksize);
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} else {
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return -EINVAL;
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}
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return 0;
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}
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static int qce_import_common(struct ahash_request *req, u64 in_count,
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const u32 *state, const u8 *buffer, bool hmac)
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{
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struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);
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struct qce_sha_reqctx *rctx = ahash_request_ctx(req);
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unsigned int digestsize = crypto_ahash_digestsize(ahash);
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unsigned int blocksize;
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u64 count = in_count;
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blocksize = crypto_tfm_alg_blocksize(crypto_ahash_tfm(ahash));
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rctx->count = in_count;
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memcpy(rctx->buf, buffer, blocksize);
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if (in_count <= blocksize) {
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rctx->first_blk = 1;
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} else {
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rctx->first_blk = 0;
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/*
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* For HMAC, there is a hardware padding done when first block
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* is set. Therefore the byte_count must be incremened by 64
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* after the first block operation.
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*/
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if (hmac)
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count += SHA_PADDING;
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}
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rctx->byte_count[0] = (__force __be32)(count & ~SHA_PADDING_MASK);
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rctx->byte_count[1] = (__force __be32)(count >> 32);
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qce_cpu_to_be32p_array((__be32 *)rctx->digest, (const u8 *)state,
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digestsize);
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rctx->buflen = (unsigned int)(in_count & (blocksize - 1));
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return 0;
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}
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static int qce_ahash_import(struct ahash_request *req, const void *in)
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{
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struct qce_sha_reqctx *rctx = ahash_request_ctx(req);
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unsigned long flags = rctx->flags;
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bool hmac = IS_SHA_HMAC(flags);
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int ret = -EINVAL;
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if (IS_SHA1(flags) || IS_SHA1_HMAC(flags)) {
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const struct sha1_state *state = in;
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ret = qce_import_common(req, state->count, state->state,
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state->buffer, hmac);
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} else if (IS_SHA256(flags) || IS_SHA256_HMAC(flags)) {
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const struct sha256_state *state = in;
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ret = qce_import_common(req, state->count, state->state,
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state->buf, hmac);
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}
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return ret;
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}
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static int qce_ahash_update(struct ahash_request *req)
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{
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
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struct qce_sha_reqctx *rctx = ahash_request_ctx(req);
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struct qce_alg_template *tmpl = to_ahash_tmpl(req->base.tfm);
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struct qce_device *qce = tmpl->qce;
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struct scatterlist *sg_last, *sg;
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unsigned int total, len;
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unsigned int hash_later;
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unsigned int nbytes;
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unsigned int blocksize;
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blocksize = crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
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rctx->count += req->nbytes;
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/* check for buffer from previous updates and append it */
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total = req->nbytes + rctx->buflen;
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if (total <= blocksize) {
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scatterwalk_map_and_copy(rctx->buf + rctx->buflen, req->src,
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0, req->nbytes, 0);
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rctx->buflen += req->nbytes;
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return 0;
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}
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/* save the original req structure fields */
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rctx->src_orig = req->src;
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rctx->nbytes_orig = req->nbytes;
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/*
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* if we have data from previous update copy them on buffer. The old
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* data will be combined with current request bytes.
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*/
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if (rctx->buflen)
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memcpy(rctx->tmpbuf, rctx->buf, rctx->buflen);
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/* calculate how many bytes will be hashed later */
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hash_later = total % blocksize;
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if (hash_later) {
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unsigned int src_offset = req->nbytes - hash_later;
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scatterwalk_map_and_copy(rctx->buf, req->src, src_offset,
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hash_later, 0);
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}
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/* here nbytes is multiple of blocksize */
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nbytes = total - hash_later;
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len = rctx->buflen;
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sg = sg_last = req->src;
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while (len < nbytes && sg) {
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if (len + sg_dma_len(sg) > nbytes)
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break;
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len += sg_dma_len(sg);
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sg_last = sg;
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sg = sg_next(sg);
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}
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if (!sg_last)
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return -EINVAL;
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sg_mark_end(sg_last);
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if (rctx->buflen) {
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sg_init_table(rctx->sg, 2);
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sg_set_buf(rctx->sg, rctx->tmpbuf, rctx->buflen);
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sg_chain(rctx->sg, 2, req->src);
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req->src = rctx->sg;
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}
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req->nbytes = nbytes;
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rctx->buflen = hash_later;
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return qce->async_req_enqueue(tmpl->qce, &req->base);
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}
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static int qce_ahash_final(struct ahash_request *req)
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{
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struct qce_sha_reqctx *rctx = ahash_request_ctx(req);
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struct qce_alg_template *tmpl = to_ahash_tmpl(req->base.tfm);
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struct qce_device *qce = tmpl->qce;
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if (!rctx->buflen)
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return 0;
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rctx->last_blk = true;
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rctx->src_orig = req->src;
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rctx->nbytes_orig = req->nbytes;
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memcpy(rctx->tmpbuf, rctx->buf, rctx->buflen);
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sg_init_one(rctx->sg, rctx->tmpbuf, rctx->buflen);
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req->src = rctx->sg;
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req->nbytes = rctx->buflen;
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return qce->async_req_enqueue(tmpl->qce, &req->base);
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}
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static int qce_ahash_digest(struct ahash_request *req)
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{
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struct qce_sha_reqctx *rctx = ahash_request_ctx(req);
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struct qce_alg_template *tmpl = to_ahash_tmpl(req->base.tfm);
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struct qce_device *qce = tmpl->qce;
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int ret;
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ret = qce_ahash_init(req);
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if (ret)
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return ret;
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rctx->src_orig = req->src;
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rctx->nbytes_orig = req->nbytes;
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rctx->first_blk = true;
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rctx->last_blk = true;
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return qce->async_req_enqueue(tmpl->qce, &req->base);
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}
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static int qce_ahash_hmac_setkey(struct crypto_ahash *tfm, const u8 *key,
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unsigned int keylen)
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{
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unsigned int digestsize = crypto_ahash_digestsize(tfm);
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struct qce_sha_ctx *ctx = crypto_tfm_ctx(&tfm->base);
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struct crypto_wait wait;
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struct ahash_request *req;
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struct scatterlist sg;
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unsigned int blocksize;
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struct crypto_ahash *ahash_tfm;
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u8 *buf;
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int ret;
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const char *alg_name;
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blocksize = crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
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memset(ctx->authkey, 0, sizeof(ctx->authkey));
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if (keylen <= blocksize) {
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memcpy(ctx->authkey, key, keylen);
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return 0;
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}
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if (digestsize == SHA1_DIGEST_SIZE)
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alg_name = "sha1-qce";
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else if (digestsize == SHA256_DIGEST_SIZE)
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alg_name = "sha256-qce";
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else
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return -EINVAL;
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ahash_tfm = crypto_alloc_ahash(alg_name, 0, 0);
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if (IS_ERR(ahash_tfm))
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return PTR_ERR(ahash_tfm);
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req = ahash_request_alloc(ahash_tfm, GFP_KERNEL);
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if (!req) {
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ret = -ENOMEM;
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goto err_free_ahash;
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}
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crypto_init_wait(&wait);
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ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
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crypto_req_done, &wait);
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crypto_ahash_clear_flags(ahash_tfm, ~0);
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buf = kzalloc(keylen + QCE_MAX_ALIGN_SIZE, GFP_KERNEL);
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if (!buf) {
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ret = -ENOMEM;
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goto err_free_req;
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}
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memcpy(buf, key, keylen);
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sg_init_one(&sg, buf, keylen);
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ahash_request_set_crypt(req, &sg, ctx->authkey, keylen);
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ret = crypto_wait_req(crypto_ahash_digest(req), &wait);
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if (ret)
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crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
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kfree(buf);
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err_free_req:
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ahash_request_free(req);
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err_free_ahash:
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crypto_free_ahash(ahash_tfm);
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return ret;
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}
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static int qce_ahash_cra_init(struct crypto_tfm *tfm)
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{
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struct crypto_ahash *ahash = __crypto_ahash_cast(tfm);
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struct qce_sha_ctx *ctx = crypto_tfm_ctx(tfm);
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crypto_ahash_set_reqsize(ahash, sizeof(struct qce_sha_reqctx));
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memset(ctx, 0, sizeof(*ctx));
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return 0;
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}
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struct qce_ahash_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 digestsize;
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unsigned int blocksize;
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unsigned int statesize;
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const u32 *std_iv;
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};
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static const struct qce_ahash_def ahash_def[] = {
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{
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.flags = QCE_HASH_SHA1,
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.name = "sha1",
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.drv_name = "sha1-qce",
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.digestsize = SHA1_DIGEST_SIZE,
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.blocksize = SHA1_BLOCK_SIZE,
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.statesize = sizeof(struct sha1_state),
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.std_iv = std_iv_sha1,
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},
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{
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.flags = QCE_HASH_SHA256,
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.name = "sha256",
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.drv_name = "sha256-qce",
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.digestsize = SHA256_DIGEST_SIZE,
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.blocksize = SHA256_BLOCK_SIZE,
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.statesize = sizeof(struct sha256_state),
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.std_iv = std_iv_sha256,
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},
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{
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.flags = QCE_HASH_SHA1_HMAC,
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.name = "hmac(sha1)",
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.drv_name = "hmac-sha1-qce",
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.digestsize = SHA1_DIGEST_SIZE,
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.blocksize = SHA1_BLOCK_SIZE,
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.statesize = sizeof(struct sha1_state),
|
|
.std_iv = std_iv_sha1,
|
|
},
|
|
{
|
|
.flags = QCE_HASH_SHA256_HMAC,
|
|
.name = "hmac(sha256)",
|
|
.drv_name = "hmac-sha256-qce",
|
|
.digestsize = SHA256_DIGEST_SIZE,
|
|
.blocksize = SHA256_BLOCK_SIZE,
|
|
.statesize = sizeof(struct sha256_state),
|
|
.std_iv = std_iv_sha256,
|
|
},
|
|
};
|
|
|
|
static int qce_ahash_register_one(const struct qce_ahash_def *def,
|
|
struct qce_device *qce)
|
|
{
|
|
struct qce_alg_template *tmpl;
|
|
struct ahash_alg *alg;
|
|
struct crypto_alg *base;
|
|
int ret;
|
|
|
|
tmpl = kzalloc(sizeof(*tmpl), GFP_KERNEL);
|
|
if (!tmpl)
|
|
return -ENOMEM;
|
|
|
|
tmpl->std_iv = def->std_iv;
|
|
|
|
alg = &tmpl->alg.ahash;
|
|
alg->init = qce_ahash_init;
|
|
alg->update = qce_ahash_update;
|
|
alg->final = qce_ahash_final;
|
|
alg->digest = qce_ahash_digest;
|
|
alg->export = qce_ahash_export;
|
|
alg->import = qce_ahash_import;
|
|
if (IS_SHA_HMAC(def->flags))
|
|
alg->setkey = qce_ahash_hmac_setkey;
|
|
alg->halg.digestsize = def->digestsize;
|
|
alg->halg.statesize = def->statesize;
|
|
|
|
base = &alg->halg.base;
|
|
base->cra_blocksize = def->blocksize;
|
|
base->cra_priority = 300;
|
|
base->cra_flags = CRYPTO_ALG_ASYNC;
|
|
base->cra_ctxsize = sizeof(struct qce_sha_ctx);
|
|
base->cra_alignmask = 0;
|
|
base->cra_module = THIS_MODULE;
|
|
base->cra_init = qce_ahash_cra_init;
|
|
INIT_LIST_HEAD(&base->cra_list);
|
|
|
|
snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
|
|
snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
|
|
def->drv_name);
|
|
|
|
INIT_LIST_HEAD(&tmpl->entry);
|
|
tmpl->crypto_alg_type = CRYPTO_ALG_TYPE_AHASH;
|
|
tmpl->alg_flags = def->flags;
|
|
tmpl->qce = qce;
|
|
|
|
ret = crypto_register_ahash(alg);
|
|
if (ret) {
|
|
kfree(tmpl);
|
|
dev_err(qce->dev, "%s registration failed\n", base->cra_name);
|
|
return ret;
|
|
}
|
|
|
|
list_add_tail(&tmpl->entry, &ahash_algs);
|
|
dev_dbg(qce->dev, "%s is registered\n", base->cra_name);
|
|
return 0;
|
|
}
|
|
|
|
static void qce_ahash_unregister(struct qce_device *qce)
|
|
{
|
|
struct qce_alg_template *tmpl, *n;
|
|
|
|
list_for_each_entry_safe(tmpl, n, &ahash_algs, entry) {
|
|
crypto_unregister_ahash(&tmpl->alg.ahash);
|
|
list_del(&tmpl->entry);
|
|
kfree(tmpl);
|
|
}
|
|
}
|
|
|
|
static int qce_ahash_register(struct qce_device *qce)
|
|
{
|
|
int ret, i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(ahash_def); i++) {
|
|
ret = qce_ahash_register_one(&ahash_def[i], qce);
|
|
if (ret)
|
|
goto err;
|
|
}
|
|
|
|
return 0;
|
|
err:
|
|
qce_ahash_unregister(qce);
|
|
return ret;
|
|
}
|
|
|
|
const struct qce_algo_ops ahash_ops = {
|
|
.type = CRYPTO_ALG_TYPE_AHASH,
|
|
.register_algs = qce_ahash_register,
|
|
.unregister_algs = qce_ahash_unregister,
|
|
.async_req_handle = qce_ahash_async_req_handle,
|
|
};
|