Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * AMD Cryptographic Coprocessor (CCP) DES3 crypto API support
 *
 * Copyright (C) 2016,2017 Advanced Micro Devices, Inc.
 *
 * Author: Gary R Hook <ghook@amd.com>
 */
 
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/scatterlist.h>
#include <linux/crypto.h>
#include <crypto/algapi.h>
#include <crypto/scatterwalk.h>
#include <crypto/internal/des.h>
 
#include "ccp-crypto.h"
 
static int ccp_des3_complete(struct crypto_async_request *async_req, int ret)
{
<------>struct skcipher_request *req = skcipher_request_cast(async_req);
<------>struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
<------>struct ccp_des3_req_ctx *rctx = skcipher_request_ctx(req);
 
<------>if (ret)
<------><------>return ret;
 
<------>if (ctx->u.des3.mode != CCP_DES3_MODE_ECB)
<------><------>memcpy(req->iv, rctx->iv, DES3_EDE_BLOCK_SIZE);
 
<------>return 0;
}
 
static int ccp_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
<------><------>unsigned int key_len)
{
<------>struct ccp_crypto_skcipher_alg *alg = ccp_crypto_skcipher_alg(tfm);
<------>struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
<------>int err;
 
<------>err = verify_skcipher_des3_key(tfm, key);
<------>if (err)
<------><------>return err;
 
<------>/* It's not clear that there is any support for a keysize of 112.
<------> * If needed, the caller should make K1 == K3
<------> */
<------>ctx->u.des3.type = CCP_DES3_TYPE_168;
<------>ctx->u.des3.mode = alg->mode;
<------>ctx->u.des3.key_len = key_len;
 
<------>memcpy(ctx->u.des3.key, key, key_len);
<------>sg_init_one(&ctx->u.des3.key_sg, ctx->u.des3.key, key_len);
 
<------>return 0;
}
 
static int ccp_des3_crypt(struct skcipher_request *req, bool encrypt)
{
<------>struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
<------>struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
<------>struct ccp_des3_req_ctx *rctx = skcipher_request_ctx(req);
<------>struct scatterlist *iv_sg = NULL;
<------>unsigned int iv_len = 0;
<------>int ret;
 
<------>if (!ctx->u.des3.key_len)
<------><------>return -EINVAL;
 
<------>if (((ctx->u.des3.mode == CCP_DES3_MODE_ECB) ||
<------>     (ctx->u.des3.mode == CCP_DES3_MODE_CBC)) &&
<------>    (req->cryptlen & (DES3_EDE_BLOCK_SIZE - 1)))
<------><------>return -EINVAL;
 
<------>if (ctx->u.des3.mode != CCP_DES3_MODE_ECB) {
<------><------>if (!req->iv)
<------><------><------>return -EINVAL;
 
<------><------>memcpy(rctx->iv, req->iv, DES3_EDE_BLOCK_SIZE);
<------><------>iv_sg = &rctx->iv_sg;
<------><------>iv_len = DES3_EDE_BLOCK_SIZE;
<------><------>sg_init_one(iv_sg, rctx->iv, iv_len);
<------>}
 
<------>memset(&rctx->cmd, 0, sizeof(rctx->cmd));
<------>INIT_LIST_HEAD(&rctx->cmd.entry);
<------>rctx->cmd.engine = CCP_ENGINE_DES3;
<------>rctx->cmd.u.des3.type = ctx->u.des3.type;
<------>rctx->cmd.u.des3.mode = ctx->u.des3.mode;
<------>rctx->cmd.u.des3.action = (encrypt)
<------><------><------><------>  ? CCP_DES3_ACTION_ENCRYPT
<------><------><------><------>  : CCP_DES3_ACTION_DECRYPT;
<------>rctx->cmd.u.des3.key = &ctx->u.des3.key_sg;
<------>rctx->cmd.u.des3.key_len = ctx->u.des3.key_len;
<------>rctx->cmd.u.des3.iv = iv_sg;
<------>rctx->cmd.u.des3.iv_len = iv_len;
<------>rctx->cmd.u.des3.src = req->src;
<------>rctx->cmd.u.des3.src_len = req->cryptlen;
<------>rctx->cmd.u.des3.dst = req->dst;
 
<------>ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
 
<------>return ret;
}
 
static int ccp_des3_encrypt(struct skcipher_request *req)
{
<------>return ccp_des3_crypt(req, true);
}
 
static int ccp_des3_decrypt(struct skcipher_request *req)
{
<------>return ccp_des3_crypt(req, false);
}
 
static int ccp_des3_init_tfm(struct crypto_skcipher *tfm)
{
<------>struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
 
<------>ctx->complete = ccp_des3_complete;
<------>ctx->u.des3.key_len = 0;
 
<------>crypto_skcipher_set_reqsize(tfm, sizeof(struct ccp_des3_req_ctx));
 
<------>return 0;
}
 
static const struct skcipher_alg ccp_des3_defaults = {
<------>.setkey			= ccp_des3_setkey,
<------>.encrypt		= ccp_des3_encrypt,
<------>.decrypt		= ccp_des3_decrypt,
<------>.min_keysize		= DES3_EDE_KEY_SIZE,
<------>.max_keysize		= DES3_EDE_KEY_SIZE,
<------>.init			= ccp_des3_init_tfm,
 
<------>.base.cra_flags		= CRYPTO_ALG_ASYNC |
<------><------><------><------>  CRYPTO_ALG_ALLOCATES_MEMORY |
<------><------><------><------>  CRYPTO_ALG_KERN_DRIVER_ONLY |
<------><------><------><------>  CRYPTO_ALG_NEED_FALLBACK,
<------>.base.cra_blocksize	= DES3_EDE_BLOCK_SIZE,
<------>.base.cra_ctxsize	= sizeof(struct ccp_ctx),
<------>.base.cra_priority	= CCP_CRA_PRIORITY,
<------>.base.cra_module	= THIS_MODULE,
};
 
struct ccp_des3_def {
<------>enum ccp_des3_mode mode;
<------>unsigned int version;
<------>const char *name;
<------>const char *driver_name;
<------>unsigned int blocksize;
<------>unsigned int ivsize;
<------>const struct skcipher_alg *alg_defaults;
};
 
static const struct ccp_des3_def des3_algs[] = {
<------>{
<------><------>.mode		= CCP_DES3_MODE_ECB,
<------><------>.version	= CCP_VERSION(5, 0),
<------><------>.name		= "ecb(des3_ede)",
<------><------>.driver_name	= "ecb-des3-ccp",
<------><------>.blocksize	= DES3_EDE_BLOCK_SIZE,
<------><------>.ivsize		= 0,
<------><------>.alg_defaults	= &ccp_des3_defaults,
<------>},
<------>{
<------><------>.mode		= CCP_DES3_MODE_CBC,
<------><------>.version	= CCP_VERSION(5, 0),
<------><------>.name		= "cbc(des3_ede)",
<------><------>.driver_name	= "cbc-des3-ccp",
<------><------>.blocksize	= DES3_EDE_BLOCK_SIZE,
<------><------>.ivsize		= DES3_EDE_BLOCK_SIZE,
<------><------>.alg_defaults	= &ccp_des3_defaults,
<------>},
};
 
static int ccp_register_des3_alg(struct list_head *head,
<------><------><------><------> const struct ccp_des3_def *def)
{
<------>struct ccp_crypto_skcipher_alg *ccp_alg;
<------>struct skcipher_alg *alg;
<------>int ret;
 
<------>ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
<------>if (!ccp_alg)
<------><------>return -ENOMEM;
 
<------>INIT_LIST_HEAD(&ccp_alg->entry);
 
<------>ccp_alg->mode = def->mode;
 
<------>/* Copy the defaults and override as necessary */
<------>alg = &ccp_alg->alg;
<------>*alg = *def->alg_defaults;
<------>snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
<------>snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
<------><------><------>def->driver_name);
<------>alg->base.cra_blocksize = def->blocksize;
<------>alg->ivsize = def->ivsize;
 
<------>ret = crypto_register_skcipher(alg);
<------>if (ret) {
<------><------>pr_err("%s skcipher algorithm registration error (%d)\n",
<------><------><------><------>alg->base.cra_name, ret);
<------><------>kfree(ccp_alg);
<------><------>return ret;
<------>}
 
<------>list_add(&ccp_alg->entry, head);
 
<------>return 0;
}
 
int ccp_register_des3_algs(struct list_head *head)
{
<------>int i, ret;
<------>unsigned int ccpversion = ccp_version();
 
<------>for (i = 0; i < ARRAY_SIZE(des3_algs); i++) {
<------><------>if (des3_algs[i].version > ccpversion)
<------><------><------>continue;
<------><------>ret = ccp_register_des3_alg(head, &des3_algs[i]);
<------><------>if (ret)
<------><------><------>return ret;
<------>}
 
<------>return 0;
}