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286 lines
7.3 KiB
286 lines
7.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* AMD Cryptographic Coprocessor (CCP) AES XTS crypto API support |
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* |
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* Copyright (C) 2013,2017 Advanced Micro Devices, Inc. |
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* |
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* Author: Gary R Hook <[email protected]> |
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* Author: Tom Lendacky <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/sched.h> |
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#include <linux/delay.h> |
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#include <linux/scatterlist.h> |
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#include <crypto/aes.h> |
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#include <crypto/xts.h> |
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#include <crypto/internal/skcipher.h> |
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#include <crypto/scatterwalk.h> |
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#include "ccp-crypto.h" |
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struct ccp_aes_xts_def { |
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const char *name; |
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const char *drv_name; |
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}; |
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static const struct ccp_aes_xts_def aes_xts_algs[] = { |
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{ |
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.name = "xts(aes)", |
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.drv_name = "xts-aes-ccp", |
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}, |
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}; |
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struct ccp_unit_size_map { |
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unsigned int size; |
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u32 value; |
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}; |
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static struct ccp_unit_size_map xts_unit_sizes[] = { |
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{ |
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.size = 16, |
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.value = CCP_XTS_AES_UNIT_SIZE_16, |
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}, |
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{ |
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.size = 512, |
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.value = CCP_XTS_AES_UNIT_SIZE_512, |
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}, |
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{ |
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.size = 1024, |
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.value = CCP_XTS_AES_UNIT_SIZE_1024, |
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}, |
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{ |
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.size = 2048, |
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.value = CCP_XTS_AES_UNIT_SIZE_2048, |
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}, |
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{ |
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.size = 4096, |
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.value = CCP_XTS_AES_UNIT_SIZE_4096, |
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}, |
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}; |
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static int ccp_aes_xts_complete(struct crypto_async_request *async_req, int ret) |
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{ |
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struct skcipher_request *req = skcipher_request_cast(async_req); |
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struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req); |
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if (ret) |
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return ret; |
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memcpy(req->iv, rctx->iv, AES_BLOCK_SIZE); |
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return 0; |
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} |
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static int ccp_aes_xts_setkey(struct crypto_skcipher *tfm, const u8 *key, |
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unsigned int key_len) |
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{ |
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struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm); |
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unsigned int ccpversion = ccp_version(); |
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int ret; |
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ret = xts_verify_key(tfm, key, key_len); |
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if (ret) |
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return ret; |
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/* Version 3 devices support 128-bit keys; version 5 devices can |
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* accommodate 128- and 256-bit keys. |
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*/ |
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switch (key_len) { |
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case AES_KEYSIZE_128 * 2: |
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memcpy(ctx->u.aes.key, key, key_len); |
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break; |
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case AES_KEYSIZE_256 * 2: |
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if (ccpversion > CCP_VERSION(3, 0)) |
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memcpy(ctx->u.aes.key, key, key_len); |
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break; |
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} |
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ctx->u.aes.key_len = key_len / 2; |
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sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len); |
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return crypto_skcipher_setkey(ctx->u.aes.tfm_skcipher, key, key_len); |
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} |
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static int ccp_aes_xts_crypt(struct skcipher_request *req, |
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unsigned int encrypt) |
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{ |
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
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struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm); |
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struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req); |
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unsigned int ccpversion = ccp_version(); |
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unsigned int fallback = 0; |
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unsigned int unit; |
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u32 unit_size; |
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int ret; |
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if (!ctx->u.aes.key_len) |
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return -EINVAL; |
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if (!req->iv) |
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return -EINVAL; |
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/* Check conditions under which the CCP can fulfill a request. The |
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* device can handle input plaintext of a length that is a multiple |
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* of the unit_size, bug the crypto implementation only supports |
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* the unit_size being equal to the input length. This limits the |
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* number of scenarios we can handle. |
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*/ |
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unit_size = CCP_XTS_AES_UNIT_SIZE__LAST; |
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for (unit = 0; unit < ARRAY_SIZE(xts_unit_sizes); unit++) { |
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if (req->cryptlen == xts_unit_sizes[unit].size) { |
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unit_size = unit; |
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break; |
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} |
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} |
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/* The CCP has restrictions on block sizes. Also, a version 3 device |
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* only supports AES-128 operations; version 5 CCPs support both |
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* AES-128 and -256 operations. |
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*/ |
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if (unit_size == CCP_XTS_AES_UNIT_SIZE__LAST) |
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fallback = 1; |
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if ((ccpversion < CCP_VERSION(5, 0)) && |
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(ctx->u.aes.key_len != AES_KEYSIZE_128)) |
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fallback = 1; |
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if ((ctx->u.aes.key_len != AES_KEYSIZE_128) && |
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(ctx->u.aes.key_len != AES_KEYSIZE_256)) |
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fallback = 1; |
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if (fallback) { |
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/* Use the fallback to process the request for any |
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* unsupported unit sizes or key sizes |
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*/ |
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skcipher_request_set_tfm(&rctx->fallback_req, |
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ctx->u.aes.tfm_skcipher); |
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skcipher_request_set_callback(&rctx->fallback_req, |
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req->base.flags, |
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req->base.complete, |
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req->base.data); |
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skcipher_request_set_crypt(&rctx->fallback_req, req->src, |
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req->dst, req->cryptlen, req->iv); |
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ret = encrypt ? crypto_skcipher_encrypt(&rctx->fallback_req) : |
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crypto_skcipher_decrypt(&rctx->fallback_req); |
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return ret; |
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} |
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memcpy(rctx->iv, req->iv, AES_BLOCK_SIZE); |
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sg_init_one(&rctx->iv_sg, rctx->iv, AES_BLOCK_SIZE); |
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memset(&rctx->cmd, 0, sizeof(rctx->cmd)); |
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INIT_LIST_HEAD(&rctx->cmd.entry); |
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rctx->cmd.engine = CCP_ENGINE_XTS_AES_128; |
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rctx->cmd.u.xts.type = CCP_AES_TYPE_128; |
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rctx->cmd.u.xts.action = (encrypt) ? CCP_AES_ACTION_ENCRYPT |
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: CCP_AES_ACTION_DECRYPT; |
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rctx->cmd.u.xts.unit_size = unit_size; |
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rctx->cmd.u.xts.key = &ctx->u.aes.key_sg; |
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rctx->cmd.u.xts.key_len = ctx->u.aes.key_len; |
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rctx->cmd.u.xts.iv = &rctx->iv_sg; |
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rctx->cmd.u.xts.iv_len = AES_BLOCK_SIZE; |
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rctx->cmd.u.xts.src = req->src; |
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rctx->cmd.u.xts.src_len = req->cryptlen; |
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rctx->cmd.u.xts.dst = req->dst; |
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ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd); |
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return ret; |
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} |
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static int ccp_aes_xts_encrypt(struct skcipher_request *req) |
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{ |
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return ccp_aes_xts_crypt(req, 1); |
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} |
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static int ccp_aes_xts_decrypt(struct skcipher_request *req) |
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{ |
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return ccp_aes_xts_crypt(req, 0); |
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} |
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static int ccp_aes_xts_init_tfm(struct crypto_skcipher *tfm) |
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{ |
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struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm); |
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struct crypto_skcipher *fallback_tfm; |
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ctx->complete = ccp_aes_xts_complete; |
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ctx->u.aes.key_len = 0; |
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fallback_tfm = crypto_alloc_skcipher("xts(aes)", 0, |
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CRYPTO_ALG_NEED_FALLBACK); |
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if (IS_ERR(fallback_tfm)) { |
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pr_warn("could not load fallback driver xts(aes)\n"); |
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return PTR_ERR(fallback_tfm); |
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} |
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ctx->u.aes.tfm_skcipher = fallback_tfm; |
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crypto_skcipher_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx) + |
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crypto_skcipher_reqsize(fallback_tfm)); |
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return 0; |
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} |
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static void ccp_aes_xts_exit_tfm(struct crypto_skcipher *tfm) |
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{ |
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struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm); |
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crypto_free_skcipher(ctx->u.aes.tfm_skcipher); |
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} |
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static int ccp_register_aes_xts_alg(struct list_head *head, |
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const struct ccp_aes_xts_def *def) |
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{ |
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struct ccp_crypto_skcipher_alg *ccp_alg; |
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struct skcipher_alg *alg; |
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int ret; |
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ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL); |
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if (!ccp_alg) |
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return -ENOMEM; |
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INIT_LIST_HEAD(&ccp_alg->entry); |
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alg = &ccp_alg->alg; |
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snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name); |
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snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s", |
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def->drv_name); |
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alg->base.cra_flags = CRYPTO_ALG_ASYNC | |
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CRYPTO_ALG_ALLOCATES_MEMORY | |
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CRYPTO_ALG_KERN_DRIVER_ONLY | |
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CRYPTO_ALG_NEED_FALLBACK; |
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alg->base.cra_blocksize = AES_BLOCK_SIZE; |
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alg->base.cra_ctxsize = sizeof(struct ccp_ctx); |
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alg->base.cra_priority = CCP_CRA_PRIORITY; |
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alg->base.cra_module = THIS_MODULE; |
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alg->setkey = ccp_aes_xts_setkey; |
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alg->encrypt = ccp_aes_xts_encrypt; |
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alg->decrypt = ccp_aes_xts_decrypt; |
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alg->min_keysize = AES_MIN_KEY_SIZE * 2; |
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alg->max_keysize = AES_MAX_KEY_SIZE * 2; |
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alg->ivsize = AES_BLOCK_SIZE; |
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alg->init = ccp_aes_xts_init_tfm; |
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alg->exit = ccp_aes_xts_exit_tfm; |
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ret = crypto_register_skcipher(alg); |
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if (ret) { |
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pr_err("%s skcipher algorithm registration error (%d)\n", |
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alg->base.cra_name, ret); |
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kfree(ccp_alg); |
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return ret; |
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} |
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list_add(&ccp_alg->entry, head); |
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return 0; |
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} |
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int ccp_register_aes_xts_algs(struct list_head *head) |
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{ |
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int i, ret; |
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for (i = 0; i < ARRAY_SIZE(aes_xts_algs); i++) { |
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ret = ccp_register_aes_xts_alg(head, &aes_xts_algs[i]); |
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if (ret) |
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return ret; |
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} |
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return 0; |
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}
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