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476 lines
13 KiB
476 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* sun8i-ce-cipher.c - hardware cryptographic offloader for |
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* Allwinner H3/A64/H5/H2+/H6/R40 SoC |
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* |
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* Copyright (C) 2016-2019 Corentin LABBE <[email protected]> |
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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/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/des.h> |
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#include <crypto/internal/skcipher.h> |
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#include "sun8i-ce.h" |
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static int sun8i_ce_cipher_need_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 scatterlist *sg; |
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if (sg_nents(areq->src) > MAX_SG || sg_nents(areq->dst) > MAX_SG) |
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return true; |
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if (areq->cryptlen < crypto_skcipher_ivsize(tfm)) |
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return true; |
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if (areq->cryptlen == 0 || areq->cryptlen % 16) |
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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 % 4 || !IS_ALIGNED(sg->offset, sizeof(u32))) |
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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 % 4 || !IS_ALIGNED(sg->offset, sizeof(u32))) |
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return true; |
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sg = sg_next(sg); |
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} |
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return false; |
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} |
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static int sun8i_ce_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_CE_DEBUG |
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struct skcipher_alg *alg = crypto_skcipher_alg(tfm); |
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struct sun8i_ce_alg_template *algt; |
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algt = container_of(alg, struct sun8i_ce_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 & CE_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_ce_cipher_prepare(struct crypto_engine *engine, void *async_req) |
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{ |
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struct skcipher_request *areq = container_of(async_req, struct skcipher_request, base); |
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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_ce_dev *ce = op->ce; |
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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_ce_alg_template *algt; |
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struct sun8i_ce_flow *chan; |
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struct ce_task *cet; |
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struct scatterlist *sg; |
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unsigned int todo, len, offset, ivsize; |
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u32 common, sym; |
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int flow, i; |
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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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algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher); |
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dev_dbg(ce->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_CE_DEBUG |
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algt->stat_req++; |
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#endif |
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flow = rctx->flow; |
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chan = &ce->chanlist[flow]; |
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cet = chan->tl; |
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memset(cet, 0, sizeof(struct ce_task)); |
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cet->t_id = cpu_to_le32(flow); |
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common = ce->variant->alg_cipher[algt->ce_algo_id]; |
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common |= rctx->op_dir | CE_COMM_INT; |
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cet->t_common_ctl = cpu_to_le32(common); |
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/* CTS and recent CE (H6) need length in bytes, in word otherwise */ |
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if (ce->variant->cipher_t_dlen_in_bytes) |
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cet->t_dlen = cpu_to_le32(areq->cryptlen); |
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else |
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cet->t_dlen = cpu_to_le32(areq->cryptlen / 4); |
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sym = ce->variant->op_mode[algt->ce_blockmode]; |
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len = op->keylen; |
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switch (len) { |
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case 128 / 8: |
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sym |= CE_AES_128BITS; |
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break; |
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case 192 / 8: |
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sym |= CE_AES_192BITS; |
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break; |
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case 256 / 8: |
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sym |= CE_AES_256BITS; |
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break; |
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} |
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cet->t_sym_ctl = cpu_to_le32(sym); |
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cet->t_asym_ctl = 0; |
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rctx->addr_key = dma_map_single(ce->dev, op->key, op->keylen, DMA_TO_DEVICE); |
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if (dma_mapping_error(ce->dev, rctx->addr_key)) { |
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dev_err(ce->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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cet->t_key = cpu_to_le32(rctx->addr_key); |
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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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rctx->ivlen = ivsize; |
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rctx->bounce_iv = kzalloc(ivsize, GFP_KERNEL | GFP_DMA); |
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if (!rctx->bounce_iv) { |
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err = -ENOMEM; |
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goto theend_key; |
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} |
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if (rctx->op_dir & CE_DECRYPTION) { |
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rctx->backup_iv = kzalloc(ivsize, GFP_KERNEL); |
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if (!rctx->backup_iv) { |
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err = -ENOMEM; |
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goto theend_key; |
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} |
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offset = areq->cryptlen - ivsize; |
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scatterwalk_map_and_copy(rctx->backup_iv, areq->src, |
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offset, ivsize, 0); |
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} |
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memcpy(rctx->bounce_iv, areq->iv, ivsize); |
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rctx->addr_iv = dma_map_single(ce->dev, rctx->bounce_iv, rctx->ivlen, |
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DMA_TO_DEVICE); |
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if (dma_mapping_error(ce->dev, rctx->addr_iv)) { |
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dev_err(ce->dev, "Cannot DMA MAP IV\n"); |
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err = -ENOMEM; |
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goto theend_iv; |
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} |
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cet->t_iv = cpu_to_le32(rctx->addr_iv); |
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} |
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if (areq->src == areq->dst) { |
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nr_sgs = dma_map_sg(ce->dev, areq->src, sg_nents(areq->src), |
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DMA_BIDIRECTIONAL); |
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if (nr_sgs <= 0 || nr_sgs > MAX_SG) { |
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dev_err(ce->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(ce->dev, areq->src, sg_nents(areq->src), |
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DMA_TO_DEVICE); |
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if (nr_sgs <= 0 || nr_sgs > MAX_SG) { |
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dev_err(ce->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(ce->dev, areq->dst, sg_nents(areq->dst), |
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DMA_FROM_DEVICE); |
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if (nr_sgd <= 0 || nr_sgd > MAX_SG) { |
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dev_err(ce->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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for_each_sg(areq->src, sg, nr_sgs, i) { |
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cet->t_src[i].addr = cpu_to_le32(sg_dma_address(sg)); |
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todo = min(len, sg_dma_len(sg)); |
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cet->t_src[i].len = cpu_to_le32(todo / 4); |
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dev_dbg(ce->dev, "%s total=%u SG(%d %u off=%d) todo=%u\n", __func__, |
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areq->cryptlen, i, cet->t_src[i].len, sg->offset, todo); |
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len -= todo; |
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} |
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if (len > 0) { |
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dev_err(ce->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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for_each_sg(areq->dst, sg, nr_sgd, i) { |
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cet->t_dst[i].addr = cpu_to_le32(sg_dma_address(sg)); |
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todo = min(len, sg_dma_len(sg)); |
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cet->t_dst[i].len = cpu_to_le32(todo / 4); |
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dev_dbg(ce->dev, "%s total=%u SG(%d %u off=%d) todo=%u\n", __func__, |
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areq->cryptlen, i, cet->t_dst[i].len, sg->offset, todo); |
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len -= todo; |
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} |
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if (len > 0) { |
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dev_err(ce->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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chan->timeout = areq->cryptlen; |
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rctx->nr_sgs = nr_sgs; |
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rctx->nr_sgd = nr_sgd; |
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return 0; |
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theend_sgs: |
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if (areq->src == areq->dst) { |
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dma_unmap_sg(ce->dev, areq->src, sg_nents(areq->src), |
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DMA_BIDIRECTIONAL); |
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} else { |
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if (nr_sgs > 0) |
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dma_unmap_sg(ce->dev, areq->src, sg_nents(areq->src), |
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DMA_TO_DEVICE); |
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dma_unmap_sg(ce->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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if (rctx->addr_iv) |
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dma_unmap_single(ce->dev, rctx->addr_iv, rctx->ivlen, DMA_TO_DEVICE); |
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offset = areq->cryptlen - ivsize; |
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if (rctx->op_dir & CE_DECRYPTION) { |
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memcpy(areq->iv, rctx->backup_iv, ivsize); |
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kfree_sensitive(rctx->backup_iv); |
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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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kfree(rctx->bounce_iv); |
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} |
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theend_key: |
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dma_unmap_single(ce->dev, rctx->addr_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_ce_cipher_run(struct crypto_engine *engine, void *areq) |
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{ |
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struct skcipher_request *breq = container_of(areq, struct skcipher_request, base); |
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(breq); |
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struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); |
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struct sun8i_ce_dev *ce = op->ce; |
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struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(breq); |
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int flow, err; |
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flow = rctx->flow; |
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err = sun8i_ce_run_task(ce, flow, crypto_tfm_alg_name(breq->base.tfm)); |
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crypto_finalize_skcipher_request(engine, breq, err); |
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return 0; |
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} |
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static int sun8i_ce_cipher_unprepare(struct crypto_engine *engine, void *async_req) |
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{ |
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struct skcipher_request *areq = container_of(async_req, struct skcipher_request, base); |
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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_ce_dev *ce = op->ce; |
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struct sun8i_cipher_req_ctx *rctx = skcipher_request_ctx(areq); |
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struct sun8i_ce_flow *chan; |
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struct ce_task *cet; |
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unsigned int ivsize, offset; |
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int nr_sgs = rctx->nr_sgs; |
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int nr_sgd = rctx->nr_sgd; |
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int flow; |
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flow = rctx->flow; |
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chan = &ce->chanlist[flow]; |
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cet = chan->tl; |
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ivsize = crypto_skcipher_ivsize(tfm); |
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if (areq->src == areq->dst) { |
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dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_BIDIRECTIONAL); |
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} else { |
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if (nr_sgs > 0) |
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dma_unmap_sg(ce->dev, areq->src, nr_sgs, DMA_TO_DEVICE); |
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dma_unmap_sg(ce->dev, areq->dst, nr_sgd, DMA_FROM_DEVICE); |
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} |
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if (areq->iv && ivsize > 0) { |
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if (cet->t_iv) |
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dma_unmap_single(ce->dev, rctx->addr_iv, rctx->ivlen, DMA_TO_DEVICE); |
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offset = areq->cryptlen - ivsize; |
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if (rctx->op_dir & CE_DECRYPTION) { |
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memcpy(areq->iv, rctx->backup_iv, ivsize); |
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kfree_sensitive(rctx->backup_iv); |
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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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kfree(rctx->bounce_iv); |
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} |
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dma_unmap_single(ce->dev, rctx->addr_key, op->keylen, DMA_TO_DEVICE); |
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return 0; |
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} |
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int sun8i_ce_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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rctx->op_dir = CE_DECRYPTION; |
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if (sun8i_ce_cipher_need_fallback(areq)) |
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return sun8i_ce_cipher_fallback(areq); |
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e = sun8i_ce_get_engine_number(op->ce); |
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rctx->flow = e; |
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engine = op->ce->chanlist[e].engine; |
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return crypto_transfer_skcipher_request_to_engine(engine, areq); |
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} |
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int sun8i_ce_skencrypt(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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rctx->op_dir = CE_ENCRYPTION; |
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if (sun8i_ce_cipher_need_fallback(areq)) |
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return sun8i_ce_cipher_fallback(areq); |
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e = sun8i_ce_get_engine_number(op->ce); |
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rctx->flow = e; |
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engine = op->ce->chanlist[e].engine; |
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return crypto_transfer_skcipher_request_to_engine(engine, areq); |
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} |
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int sun8i_ce_cipher_init(struct crypto_tfm *tfm) |
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{ |
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struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm); |
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struct sun8i_ce_alg_template *algt; |
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const char *name = crypto_tfm_alg_name(tfm); |
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struct crypto_skcipher *sktfm = __crypto_skcipher_cast(tfm); |
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struct skcipher_alg *alg = crypto_skcipher_alg(sktfm); |
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int err; |
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memset(op, 0, sizeof(struct sun8i_cipher_tfm_ctx)); |
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algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher); |
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op->ce = algt->ce; |
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op->fallback_tfm = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK); |
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if (IS_ERR(op->fallback_tfm)) { |
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dev_err(op->ce->dev, "ERROR: Cannot allocate fallback for %s %ld\n", |
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name, PTR_ERR(op->fallback_tfm)); |
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return PTR_ERR(op->fallback_tfm); |
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} |
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sktfm->reqsize = sizeof(struct sun8i_cipher_req_ctx) + |
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crypto_skcipher_reqsize(op->fallback_tfm); |
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dev_info(op->ce->dev, "Fallback for %s is %s\n", |
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crypto_tfm_alg_driver_name(&sktfm->base), |
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crypto_tfm_alg_driver_name(crypto_skcipher_tfm(op->fallback_tfm))); |
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op->enginectx.op.do_one_request = sun8i_ce_cipher_run; |
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op->enginectx.op.prepare_request = sun8i_ce_cipher_prepare; |
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op->enginectx.op.unprepare_request = sun8i_ce_cipher_unprepare; |
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err = pm_runtime_get_sync(op->ce->dev); |
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if (err < 0) |
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goto error_pm; |
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return 0; |
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error_pm: |
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pm_runtime_put_noidle(op->ce->dev); |
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crypto_free_skcipher(op->fallback_tfm); |
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return err; |
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} |
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void sun8i_ce_cipher_exit(struct crypto_tfm *tfm) |
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{ |
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struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm); |
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kfree_sensitive(op->key); |
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crypto_free_skcipher(op->fallback_tfm); |
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pm_runtime_put_sync_suspend(op->ce->dev); |
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} |
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int sun8i_ce_aes_setkey(struct crypto_skcipher *tfm, const u8 *key, |
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unsigned int keylen) |
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{ |
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struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); |
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struct sun8i_ce_dev *ce = op->ce; |
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switch (keylen) { |
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case 128 / 8: |
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break; |
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case 192 / 8: |
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break; |
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case 256 / 8: |
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break; |
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default: |
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dev_dbg(ce->dev, "ERROR: Invalid keylen %u\n", keylen); |
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return -EINVAL; |
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} |
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kfree_sensitive(op->key); |
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op->keylen = keylen; |
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op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA); |
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if (!op->key) |
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return -ENOMEM; |
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crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK); |
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crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK); |
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return crypto_skcipher_setkey(op->fallback_tfm, key, keylen); |
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} |
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int sun8i_ce_des3_setkey(struct crypto_skcipher *tfm, const u8 *key, |
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unsigned int keylen) |
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{ |
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struct sun8i_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm); |
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int err; |
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err = verify_skcipher_des3_key(tfm, key); |
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if (err) |
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return err; |
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kfree_sensitive(op->key); |
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op->keylen = keylen; |
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op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA); |
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if (!op->key) |
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return -ENOMEM; |
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crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK); |
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crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK); |
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return crypto_skcipher_setkey(op->fallback_tfm, key, keylen); |
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}
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