471 lines
13 KiB
C
471 lines
13 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* sun8i-ss-cipher.c - hardware cryptographic offloader for
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* Allwinner A80/A83T SoC
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*
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* Copyright (C) 2016-2019 Corentin LABBE <clabbe.montjoie@gmail.com>
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*
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* This file add support for AES cipher with 128,192,256 bits keysize in
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* CBC and ECB mode.
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*
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* You could find a link for the datasheet in Documentation/arm/sunxi.rst
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*/
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#include <linux/bottom_half.h>
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#include <linux/crypto.h>
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#include <linux/dma-mapping.h>
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#include <linux/io.h>
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#include <linux/pm_runtime.h>
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#include <crypto/scatterwalk.h>
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#include <crypto/internal/skcipher.h>
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#include "sun8i-ss.h"
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static bool sun8i_ss_need_fallback(struct skcipher_request *areq)
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{
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struct scatterlist *in_sg = areq->src;
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struct scatterlist *out_sg = areq->dst;
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struct scatterlist *sg;
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if (areq->cryptlen == 0 || areq->cryptlen % 16)
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return true;
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if (sg_nents(areq->src) > 8 || sg_nents(areq->dst) > 8)
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return true;
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sg = areq->src;
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while (sg) {
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if ((sg->length % 16) != 0)
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return true;
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if ((sg_dma_len(sg) % 16) != 0)
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return true;
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if (!IS_ALIGNED(sg->offset, 16))
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return true;
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sg = sg_next(sg);
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}
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sg = areq->dst;
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while (sg) {
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if ((sg->length % 16) != 0)
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return true;
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if ((sg_dma_len(sg) % 16) != 0)
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return true;
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if (!IS_ALIGNED(sg->offset, 16))
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return true;
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sg = sg_next(sg);
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}
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/* SS need same numbers of SG (with same length) for source and destination */
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in_sg = areq->src;
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out_sg = areq->dst;
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while (in_sg && out_sg) {
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if (in_sg->length != out_sg->length)
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return true;
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in_sg = sg_next(in_sg);
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out_sg = sg_next(out_sg);
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}
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if (in_sg || out_sg)
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return true;
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return false;
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}
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static int sun8i_ss_cipher_fallback(struct skcipher_request *areq)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
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struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
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struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
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int err;
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#ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
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struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
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struct sun8i_ss_alg_template *algt;
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algt = container_of(alg, struct sun8i_ss_alg_template, alg.skcipher);
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algt->stat_fb++;
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#endif
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skcipher_request_set_tfm(&rctx->fallback_req, op->fallback_tfm);
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skcipher_request_set_callback(&rctx->fallback_req, areq->base.flags,
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areq->base.complete, areq->base.data);
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skcipher_request_set_crypt(&rctx->fallback_req, areq->src, areq->dst,
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areq->cryptlen, areq->iv);
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if (rctx->op_dir & SS_DECRYPTION)
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err = crypto_skcipher_decrypt(&rctx->fallback_req);
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else
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err = crypto_skcipher_encrypt(&rctx->fallback_req);
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return err;
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}
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static int sun8i_ss_setup_ivs(struct skcipher_request *areq)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
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struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
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struct sun8i_ss_dev *ss = op->ss;
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struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
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struct scatterlist *sg = areq->src;
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unsigned int todo, offset;
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unsigned int len = areq->cryptlen;
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unsigned int ivsize = crypto_skcipher_ivsize(tfm);
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struct sun8i_ss_flow *sf = &ss->flows[rctx->flow];
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int i = 0;
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u32 a;
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int err;
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rctx->ivlen = ivsize;
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if (rctx->op_dir & SS_DECRYPTION) {
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offset = areq->cryptlen - ivsize;
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scatterwalk_map_and_copy(sf->biv, areq->src, offset,
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ivsize, 0);
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}
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/* we need to copy all IVs from source in case DMA is bi-directionnal */
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while (sg && len) {
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if (sg_dma_len(sg) == 0) {
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sg = sg_next(sg);
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continue;
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}
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if (i == 0)
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memcpy(sf->iv[0], areq->iv, ivsize);
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a = dma_map_single(ss->dev, sf->iv[i], ivsize, DMA_TO_DEVICE);
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if (dma_mapping_error(ss->dev, a)) {
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memzero_explicit(sf->iv[i], ivsize);
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dev_err(ss->dev, "Cannot DMA MAP IV\n");
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err = -EFAULT;
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goto dma_iv_error;
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}
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rctx->p_iv[i] = a;
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/* we need to setup all others IVs only in the decrypt way */
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if (rctx->op_dir & SS_ENCRYPTION)
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return 0;
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todo = min(len, sg_dma_len(sg));
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len -= todo;
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i++;
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if (i < MAX_SG) {
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offset = sg->length - ivsize;
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scatterwalk_map_and_copy(sf->iv[i], sg, offset, ivsize, 0);
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}
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rctx->niv = i;
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sg = sg_next(sg);
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}
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return 0;
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dma_iv_error:
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i--;
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while (i >= 0) {
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dma_unmap_single(ss->dev, rctx->p_iv[i], ivsize, DMA_TO_DEVICE);
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memzero_explicit(sf->iv[i], ivsize);
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}
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return err;
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}
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static int sun8i_ss_cipher(struct skcipher_request *areq)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
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struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
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struct sun8i_ss_dev *ss = op->ss;
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struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
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struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
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struct sun8i_ss_alg_template *algt;
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struct sun8i_ss_flow *sf = &ss->flows[rctx->flow];
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struct scatterlist *sg;
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unsigned int todo, len, offset, ivsize;
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int nr_sgs = 0;
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int nr_sgd = 0;
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int err = 0;
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int i;
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algt = container_of(alg, struct sun8i_ss_alg_template, alg.skcipher);
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dev_dbg(ss->dev, "%s %s %u %x IV(%p %u) key=%u\n", __func__,
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crypto_tfm_alg_name(areq->base.tfm),
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areq->cryptlen,
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rctx->op_dir, areq->iv, crypto_skcipher_ivsize(tfm),
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op->keylen);
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#ifdef CONFIG_CRYPTO_DEV_SUN8I_SS_DEBUG
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algt->stat_req++;
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#endif
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rctx->op_mode = ss->variant->op_mode[algt->ss_blockmode];
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rctx->method = ss->variant->alg_cipher[algt->ss_algo_id];
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rctx->keylen = op->keylen;
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rctx->p_key = dma_map_single(ss->dev, op->key, op->keylen, DMA_TO_DEVICE);
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if (dma_mapping_error(ss->dev, rctx->p_key)) {
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dev_err(ss->dev, "Cannot DMA MAP KEY\n");
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err = -EFAULT;
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goto theend;
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}
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ivsize = crypto_skcipher_ivsize(tfm);
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if (areq->iv && crypto_skcipher_ivsize(tfm) > 0) {
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err = sun8i_ss_setup_ivs(areq);
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if (err)
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goto theend_key;
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}
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if (areq->src == areq->dst) {
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nr_sgs = dma_map_sg(ss->dev, areq->src, sg_nents(areq->src),
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DMA_BIDIRECTIONAL);
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if (nr_sgs <= 0 || nr_sgs > 8) {
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dev_err(ss->dev, "Invalid sg number %d\n", nr_sgs);
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err = -EINVAL;
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goto theend_iv;
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}
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nr_sgd = nr_sgs;
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} else {
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nr_sgs = dma_map_sg(ss->dev, areq->src, sg_nents(areq->src),
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DMA_TO_DEVICE);
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if (nr_sgs <= 0 || nr_sgs > 8) {
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dev_err(ss->dev, "Invalid sg number %d\n", nr_sgs);
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err = -EINVAL;
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goto theend_iv;
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}
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nr_sgd = dma_map_sg(ss->dev, areq->dst, sg_nents(areq->dst),
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DMA_FROM_DEVICE);
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if (nr_sgd <= 0 || nr_sgd > 8) {
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dev_err(ss->dev, "Invalid sg number %d\n", nr_sgd);
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err = -EINVAL;
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goto theend_sgs;
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}
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}
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len = areq->cryptlen;
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i = 0;
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sg = areq->src;
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while (i < nr_sgs && sg && len) {
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if (sg_dma_len(sg) == 0)
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goto sgs_next;
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rctx->t_src[i].addr = sg_dma_address(sg);
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todo = min(len, sg_dma_len(sg));
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rctx->t_src[i].len = todo / 4;
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dev_dbg(ss->dev, "%s total=%u SGS(%d %u off=%d) todo=%u\n", __func__,
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areq->cryptlen, i, rctx->t_src[i].len, sg->offset, todo);
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len -= todo;
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i++;
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sgs_next:
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sg = sg_next(sg);
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}
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if (len > 0) {
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dev_err(ss->dev, "remaining len %d\n", len);
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err = -EINVAL;
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goto theend_sgs;
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}
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len = areq->cryptlen;
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i = 0;
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sg = areq->dst;
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while (i < nr_sgd && sg && len) {
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if (sg_dma_len(sg) == 0)
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goto sgd_next;
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rctx->t_dst[i].addr = sg_dma_address(sg);
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todo = min(len, sg_dma_len(sg));
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rctx->t_dst[i].len = todo / 4;
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dev_dbg(ss->dev, "%s total=%u SGD(%d %u off=%d) todo=%u\n", __func__,
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areq->cryptlen, i, rctx->t_dst[i].len, sg->offset, todo);
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len -= todo;
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i++;
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sgd_next:
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sg = sg_next(sg);
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}
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if (len > 0) {
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dev_err(ss->dev, "remaining len %d\n", len);
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err = -EINVAL;
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goto theend_sgs;
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}
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err = sun8i_ss_run_task(ss, rctx, crypto_tfm_alg_name(areq->base.tfm));
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theend_sgs:
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if (areq->src == areq->dst) {
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dma_unmap_sg(ss->dev, areq->src, sg_nents(areq->src),
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DMA_BIDIRECTIONAL);
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} else {
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dma_unmap_sg(ss->dev, areq->src, sg_nents(areq->src),
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DMA_TO_DEVICE);
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dma_unmap_sg(ss->dev, areq->dst, sg_nents(areq->dst),
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DMA_FROM_DEVICE);
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}
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theend_iv:
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if (areq->iv && ivsize > 0) {
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for (i = 0; i < rctx->niv; i++) {
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dma_unmap_single(ss->dev, rctx->p_iv[i], ivsize, DMA_TO_DEVICE);
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memzero_explicit(sf->iv[i], ivsize);
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}
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offset = areq->cryptlen - ivsize;
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if (rctx->op_dir & SS_DECRYPTION) {
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memcpy(areq->iv, sf->biv, ivsize);
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memzero_explicit(sf->biv, ivsize);
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} else {
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scatterwalk_map_and_copy(areq->iv, areq->dst, offset,
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ivsize, 0);
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}
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}
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theend_key:
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dma_unmap_single(ss->dev, rctx->p_key, op->keylen, DMA_TO_DEVICE);
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theend:
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return err;
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}
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static int sun8i_ss_handle_cipher_request(struct crypto_engine *engine, void *areq)
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{
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int err;
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struct skcipher_request *breq = container_of(areq, struct skcipher_request, base);
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err = sun8i_ss_cipher(breq);
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local_bh_disable();
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crypto_finalize_skcipher_request(engine, breq, err);
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local_bh_enable();
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return 0;
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}
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int sun8i_ss_skdecrypt(struct skcipher_request *areq)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
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struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
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struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
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struct crypto_engine *engine;
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int e;
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memset(rctx, 0, sizeof(struct sun8i_cipher_req_ctx));
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rctx->op_dir = SS_DECRYPTION;
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if (sun8i_ss_need_fallback(areq))
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return sun8i_ss_cipher_fallback(areq);
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e = sun8i_ss_get_engine_number(op->ss);
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engine = op->ss->flows[e].engine;
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rctx->flow = e;
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return crypto_transfer_skcipher_request_to_engine(engine, areq);
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}
|
||
|
|
|
||
|
|
int sun8i_ss_skencrypt(struct skcipher_request *areq)
|
||
|
|
{
|
||
|
|
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
|
||
|
|
struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
|
||
|
|
struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
|
||
|
|
struct crypto_engine *engine;
|
||
|
|
int e;
|
||
|
|
|
||
|
|
memset(rctx, 0, sizeof(struct sun8i_cipher_req_ctx));
|
||
|
|
rctx->op_dir = SS_ENCRYPTION;
|
||
|
|
|
||
|
|
if (sun8i_ss_need_fallback(areq))
|
||
|
|
return sun8i_ss_cipher_fallback(areq);
|
||
|
|
|
||
|
|
e = sun8i_ss_get_engine_number(op->ss);
|
||
|
|
engine = op->ss->flows[e].engine;
|
||
|
|
rctx->flow = e;
|
||
|
|
|
||
|
|
return crypto_transfer_skcipher_request_to_engine(engine, areq);
|
||
|
|
}
|
||
|
|
|
||
|
|
int sun8i_ss_cipher_init(struct crypto_tfm *tfm)
|
||
|
|
{
|
||
|
|
struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
|
||
|
|
struct sun8i_ss_alg_template *algt;
|
||
|
|
const char *name = crypto_tfm_alg_name(tfm);
|
||
|
|
struct crypto_skcipher *sktfm = __crypto_skcipher_cast(tfm);
|
||
|
|
struct skcipher_alg *alg = crypto_skcipher_alg(sktfm);
|
||
|
|
int err;
|
||
|
|
|
||
|
|
memset(op, 0, sizeof(struct sun8i_cipher_tfm_ctx));
|
||
|
|
|
||
|
|
algt = container_of(alg, struct sun8i_ss_alg_template, alg.skcipher);
|
||
|
|
op->ss = algt->ss;
|
||
|
|
|
||
|
|
op->fallback_tfm = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
|
||
|
|
if (IS_ERR(op->fallback_tfm)) {
|
||
|
|
dev_err(op->ss->dev, "ERROR: Cannot allocate fallback for %s %ld\n",
|
||
|
|
name, PTR_ERR(op->fallback_tfm));
|
||
|
|
return PTR_ERR(op->fallback_tfm);
|
||
|
|
}
|
||
|
|
|
||
|
|
sktfm->reqsize = sizeof(struct sun8i_cipher_req_ctx) +
|
||
|
|
crypto_skcipher_reqsize(op->fallback_tfm);
|
||
|
|
|
||
|
|
|
||
|
|
dev_info(op->ss->dev, "Fallback for %s is %s\n",
|
||
|
|
crypto_tfm_alg_driver_name(&sktfm->base),
|
||
|
|
crypto_tfm_alg_driver_name(crypto_skcipher_tfm(op->fallback_tfm)));
|
||
|
|
|
||
|
|
op->enginectx.op.do_one_request = sun8i_ss_handle_cipher_request;
|
||
|
|
op->enginectx.op.prepare_request = NULL;
|
||
|
|
op->enginectx.op.unprepare_request = NULL;
|
||
|
|
|
||
|
|
err = pm_runtime_resume_and_get(op->ss->dev);
|
||
|
|
if (err < 0) {
|
||
|
|
dev_err(op->ss->dev, "pm error %d\n", err);
|
||
|
|
goto error_pm;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
error_pm:
|
||
|
|
crypto_free_skcipher(op->fallback_tfm);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
void sun8i_ss_cipher_exit(struct crypto_tfm *tfm)
|
||
|
|
{
|
||
|
|
struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
|
||
|
|
|
||
|
|
kfree_sensitive(op->key);
|
||
|
|
crypto_free_skcipher(op->fallback_tfm);
|
||
|
|
pm_runtime_put_sync(op->ss->dev);
|
||
|
|
}
|
||
|
|
|
||
|
|
int sun8i_ss_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
|
||
|
|
unsigned int keylen)
|
||
|
|
{
|
||
|
|
struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
|
||
|
|
struct sun8i_ss_dev *ss = op->ss;
|
||
|
|
|
||
|
|
switch (keylen) {
|
||
|
|
case 128 / 8:
|
||
|
|
break;
|
||
|
|
case 192 / 8:
|
||
|
|
break;
|
||
|
|
case 256 / 8:
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
dev_dbg(ss->dev, "ERROR: Invalid keylen %u\n", keylen);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
kfree_sensitive(op->key);
|
||
|
|
op->keylen = keylen;
|
||
|
|
op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
|
||
|
|
if (!op->key)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
|
||
|
|
crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
|
||
|
|
|
||
|
|
return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
|
||
|
|
}
|
||
|
|
|
||
|
|
int sun8i_ss_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
|
||
|
|
unsigned int keylen)
|
||
|
|
{
|
||
|
|
struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
|
||
|
|
struct sun8i_ss_dev *ss = op->ss;
|
||
|
|
|
||
|
|
if (unlikely(keylen != 3 * DES_KEY_SIZE)) {
|
||
|
|
dev_dbg(ss->dev, "Invalid keylen %u\n", keylen);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
kfree_sensitive(op->key);
|
||
|
|
op->keylen = keylen;
|
||
|
|
op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
|
||
|
|
if (!op->key)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
|
||
|
|
crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
|
||
|
|
|
||
|
|
return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
|
||
|
|
}
|