crypto: ccp - CCP XTS-AES crypto API support
These routines provide crypto API support for the XTS-AES mode of AES on the AMD CCP. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Tom Lendacky
Herbert Xu
parent
7c1853711f
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1d6b8a6f64
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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 Advanced Micro Devices, Inc.
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*
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* Author: Tom Lendacky <thomas.lendacky@amd.com>
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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 as
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* published by the Free Software Foundation.
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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 <linux/crypto.h>
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#include <crypto/algapi.h>
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#include <crypto/aes.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 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 unit_size_map[] = {
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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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.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 = 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 = 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 = 256,
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.value = CCP_XTS_AES_UNIT_SIZE__LAST,
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},
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{
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.size = 128,
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.value = CCP_XTS_AES_UNIT_SIZE__LAST,
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},
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{
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.size = 64,
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.value = CCP_XTS_AES_UNIT_SIZE__LAST,
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},
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{
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.size = 32,
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.value = CCP_XTS_AES_UNIT_SIZE__LAST,
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},
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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 = 1,
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.value = CCP_XTS_AES_UNIT_SIZE__LAST,
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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 ablkcipher_request *req = ablkcipher_request_cast(async_req);
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struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);
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if (ret)
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return ret;
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memcpy(req->info, 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_ablkcipher *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_tfm_ctx(crypto_ablkcipher_tfm(tfm));
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/* Only support 128-bit AES key with a 128-bit Tweak key,
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* otherwise use the fallback
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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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}
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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_ablkcipher_setkey(ctx->u.aes.tfm_ablkcipher, key,
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key_len);
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}
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static int ccp_aes_xts_crypt(struct ablkcipher_request *req,
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unsigned int encrypt)
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{
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struct crypto_tfm *tfm =
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crypto_ablkcipher_tfm(crypto_ablkcipher_reqtfm(req));
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struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
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struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);
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unsigned int unit;
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int ret;
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if (!ctx->u.aes.key_len) {
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pr_err("AES key not set\n");
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return -EINVAL;
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}
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if (req->nbytes & (AES_BLOCK_SIZE - 1)) {
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pr_err("AES request size is not a multiple of the block size\n");
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return -EINVAL;
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}
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if (!req->info) {
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pr_err("AES IV not supplied");
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return -EINVAL;
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}
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for (unit = 0; unit < ARRAY_SIZE(unit_size_map); unit++)
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if (!(req->nbytes & (unit_size_map[unit].size - 1)))
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break;
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if ((unit_size_map[unit].value == CCP_XTS_AES_UNIT_SIZE__LAST) ||
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(ctx->u.aes.key_len != AES_KEYSIZE_128)) {
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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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ablkcipher_request_set_tfm(req, ctx->u.aes.tfm_ablkcipher);
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ret = (encrypt) ? crypto_ablkcipher_encrypt(req) :
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crypto_ablkcipher_decrypt(req);
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ablkcipher_request_set_tfm(req, __crypto_ablkcipher_cast(tfm));
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return ret;
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}
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memcpy(rctx->iv, req->info, 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.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_map[unit].value;
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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->nbytes;
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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 ablkcipher_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 ablkcipher_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_cra_init(struct crypto_tfm *tfm)
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{
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struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
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struct crypto_ablkcipher *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_ablkcipher(tfm->__crt_alg->cra_name, 0,
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CRYPTO_ALG_ASYNC |
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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 %s\n",
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tfm->__crt_alg->cra_name);
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return PTR_ERR(fallback_tfm);
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}
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ctx->u.aes.tfm_ablkcipher = fallback_tfm;
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tfm->crt_ablkcipher.reqsize = sizeof(struct ccp_aes_req_ctx) +
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fallback_tfm->base.crt_ablkcipher.reqsize;
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return 0;
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}
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static void ccp_aes_xts_cra_exit(struct crypto_tfm *tfm)
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{
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struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
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if (ctx->u.aes.tfm_ablkcipher)
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crypto_free_ablkcipher(ctx->u.aes.tfm_ablkcipher);
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ctx->u.aes.tfm_ablkcipher = NULL;
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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_ablkcipher_alg *ccp_alg;
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struct crypto_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->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
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snprintf(alg->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
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def->drv_name);
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alg->cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC |
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CRYPTO_ALG_KERN_DRIVER_ONLY |
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CRYPTO_ALG_NEED_FALLBACK;
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alg->cra_blocksize = AES_BLOCK_SIZE;
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alg->cra_ctxsize = sizeof(struct ccp_ctx);
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alg->cra_priority = CCP_CRA_PRIORITY;
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alg->cra_type = &crypto_ablkcipher_type;
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alg->cra_ablkcipher.setkey = ccp_aes_xts_setkey;
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alg->cra_ablkcipher.encrypt = ccp_aes_xts_encrypt;
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alg->cra_ablkcipher.decrypt = ccp_aes_xts_decrypt;
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alg->cra_ablkcipher.min_keysize = AES_MIN_KEY_SIZE * 2;
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alg->cra_ablkcipher.max_keysize = AES_MAX_KEY_SIZE * 2;
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alg->cra_ablkcipher.ivsize = AES_BLOCK_SIZE;
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alg->cra_init = ccp_aes_xts_cra_init;
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alg->cra_exit = ccp_aes_xts_cra_exit;
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alg->cra_module = THIS_MODULE;
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ret = crypto_register_alg(alg);
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if (ret) {
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pr_err("%s ablkcipher algorithm registration error (%d)\n",
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alg->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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