379 lines
9.3 KiB
C
379 lines
9.3 KiB
C
|
/*
|
||
|
|
* AMD Cryptographic Coprocessor (CCP) AES crypto API support
|
||
|
|
*
|
||
|
|
* Copyright (C) 2013,2016 Advanced Micro Devices, Inc.
|
||
|
|
*
|
||
|
|
* Author: Tom Lendacky <thomas.lendacky@amd.com>
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#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/aes.h>
|
||
|
|
#include <crypto/ctr.h>
|
||
|
|
#include <crypto/scatterwalk.h>
|
||
|
|
|
||
|
|
#include "ccp-crypto.h"
|
||
|
|
|
||
|
|
static int ccp_aes_complete(struct crypto_async_request *async_req, int ret)
|
||
|
|
{
|
||
|
|
struct ablkcipher_request *req = ablkcipher_request_cast(async_req);
|
||
|
|
struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
|
||
|
|
struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);
|
||
|
|
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
if (ctx->u.aes.mode != CCP_AES_MODE_ECB)
|
||
|
|
memcpy(req->info, rctx->iv, AES_BLOCK_SIZE);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
|
||
|
|
unsigned int key_len)
|
||
|
|
{
|
||
|
|
struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ablkcipher_tfm(tfm));
|
||
|
|
struct ccp_crypto_ablkcipher_alg *alg =
|
||
|
|
ccp_crypto_ablkcipher_alg(crypto_ablkcipher_tfm(tfm));
|
||
|
|
|
||
|
|
switch (key_len) {
|
||
|
|
case AES_KEYSIZE_128:
|
||
|
|
ctx->u.aes.type = CCP_AES_TYPE_128;
|
||
|
|
break;
|
||
|
|
case AES_KEYSIZE_192:
|
||
|
|
ctx->u.aes.type = CCP_AES_TYPE_192;
|
||
|
|
break;
|
||
|
|
case AES_KEYSIZE_256:
|
||
|
|
ctx->u.aes.type = CCP_AES_TYPE_256;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
ctx->u.aes.mode = alg->mode;
|
||
|
|
ctx->u.aes.key_len = key_len;
|
||
|
|
|
||
|
|
memcpy(ctx->u.aes.key, key, key_len);
|
||
|
|
sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_aes_crypt(struct ablkcipher_request *req, bool encrypt)
|
||
|
|
{
|
||
|
|
struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
|
||
|
|
struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);
|
||
|
|
struct scatterlist *iv_sg = NULL;
|
||
|
|
unsigned int iv_len = 0;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
if (!ctx->u.aes.key_len)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
if (((ctx->u.aes.mode == CCP_AES_MODE_ECB) ||
|
||
|
|
(ctx->u.aes.mode == CCP_AES_MODE_CBC) ||
|
||
|
|
(ctx->u.aes.mode == CCP_AES_MODE_CFB)) &&
|
||
|
|
(req->nbytes & (AES_BLOCK_SIZE - 1)))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
if (ctx->u.aes.mode != CCP_AES_MODE_ECB) {
|
||
|
|
if (!req->info)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
memcpy(rctx->iv, req->info, AES_BLOCK_SIZE);
|
||
|
|
iv_sg = &rctx->iv_sg;
|
||
|
|
iv_len = AES_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_AES;
|
||
|
|
rctx->cmd.u.aes.type = ctx->u.aes.type;
|
||
|
|
rctx->cmd.u.aes.mode = ctx->u.aes.mode;
|
||
|
|
rctx->cmd.u.aes.action =
|
||
|
|
(encrypt) ? CCP_AES_ACTION_ENCRYPT : CCP_AES_ACTION_DECRYPT;
|
||
|
|
rctx->cmd.u.aes.key = &ctx->u.aes.key_sg;
|
||
|
|
rctx->cmd.u.aes.key_len = ctx->u.aes.key_len;
|
||
|
|
rctx->cmd.u.aes.iv = iv_sg;
|
||
|
|
rctx->cmd.u.aes.iv_len = iv_len;
|
||
|
|
rctx->cmd.u.aes.src = req->src;
|
||
|
|
rctx->cmd.u.aes.src_len = req->nbytes;
|
||
|
|
rctx->cmd.u.aes.dst = req->dst;
|
||
|
|
|
||
|
|
ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_aes_encrypt(struct ablkcipher_request *req)
|
||
|
|
{
|
||
|
|
return ccp_aes_crypt(req, true);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_aes_decrypt(struct ablkcipher_request *req)
|
||
|
|
{
|
||
|
|
return ccp_aes_crypt(req, false);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_aes_cra_init(struct crypto_tfm *tfm)
|
||
|
|
{
|
||
|
|
struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
|
||
|
|
|
||
|
|
ctx->complete = ccp_aes_complete;
|
||
|
|
ctx->u.aes.key_len = 0;
|
||
|
|
|
||
|
|
tfm->crt_ablkcipher.reqsize = sizeof(struct ccp_aes_req_ctx);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ccp_aes_cra_exit(struct crypto_tfm *tfm)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_aes_rfc3686_complete(struct crypto_async_request *async_req,
|
||
|
|
int ret)
|
||
|
|
{
|
||
|
|
struct ablkcipher_request *req = ablkcipher_request_cast(async_req);
|
||
|
|
struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);
|
||
|
|
|
||
|
|
/* Restore the original pointer */
|
||
|
|
req->info = rctx->rfc3686_info;
|
||
|
|
|
||
|
|
return ccp_aes_complete(async_req, ret);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_aes_rfc3686_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
|
||
|
|
unsigned int key_len)
|
||
|
|
{
|
||
|
|
struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ablkcipher_tfm(tfm));
|
||
|
|
|
||
|
|
if (key_len < CTR_RFC3686_NONCE_SIZE)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
key_len -= CTR_RFC3686_NONCE_SIZE;
|
||
|
|
memcpy(ctx->u.aes.nonce, key + key_len, CTR_RFC3686_NONCE_SIZE);
|
||
|
|
|
||
|
|
return ccp_aes_setkey(tfm, key, key_len);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_aes_rfc3686_crypt(struct ablkcipher_request *req, bool encrypt)
|
||
|
|
{
|
||
|
|
struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
|
||
|
|
struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);
|
||
|
|
u8 *iv;
|
||
|
|
|
||
|
|
/* Initialize the CTR block */
|
||
|
|
iv = rctx->rfc3686_iv;
|
||
|
|
memcpy(iv, ctx->u.aes.nonce, CTR_RFC3686_NONCE_SIZE);
|
||
|
|
|
||
|
|
iv += CTR_RFC3686_NONCE_SIZE;
|
||
|
|
memcpy(iv, req->info, CTR_RFC3686_IV_SIZE);
|
||
|
|
|
||
|
|
iv += CTR_RFC3686_IV_SIZE;
|
||
|
|
*(__be32 *)iv = cpu_to_be32(1);
|
||
|
|
|
||
|
|
/* Point to the new IV */
|
||
|
|
rctx->rfc3686_info = req->info;
|
||
|
|
req->info = rctx->rfc3686_iv;
|
||
|
|
|
||
|
|
return ccp_aes_crypt(req, encrypt);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_aes_rfc3686_encrypt(struct ablkcipher_request *req)
|
||
|
|
{
|
||
|
|
return ccp_aes_rfc3686_crypt(req, true);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_aes_rfc3686_decrypt(struct ablkcipher_request *req)
|
||
|
|
{
|
||
|
|
return ccp_aes_rfc3686_crypt(req, false);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ccp_aes_rfc3686_cra_init(struct crypto_tfm *tfm)
|
||
|
|
{
|
||
|
|
struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
|
||
|
|
|
||
|
|
ctx->complete = ccp_aes_rfc3686_complete;
|
||
|
|
ctx->u.aes.key_len = 0;
|
||
|
|
|
||
|
|
tfm->crt_ablkcipher.reqsize = sizeof(struct ccp_aes_req_ctx);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ccp_aes_rfc3686_cra_exit(struct crypto_tfm *tfm)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct crypto_alg ccp_aes_defaults = {
|
||
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
|
||
|
|
CRYPTO_ALG_ASYNC |
|
||
|
|
CRYPTO_ALG_KERN_DRIVER_ONLY |
|
||
|
|
CRYPTO_ALG_NEED_FALLBACK,
|
||
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
|
.cra_ctxsize = sizeof(struct ccp_ctx),
|
||
|
|
.cra_priority = CCP_CRA_PRIORITY,
|
||
|
|
.cra_type = &crypto_ablkcipher_type,
|
||
|
|
.cra_init = ccp_aes_cra_init,
|
||
|
|
.cra_exit = ccp_aes_cra_exit,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
.cra_ablkcipher = {
|
||
|
|
.setkey = ccp_aes_setkey,
|
||
|
|
.encrypt = ccp_aes_encrypt,
|
||
|
|
.decrypt = ccp_aes_decrypt,
|
||
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct crypto_alg ccp_aes_rfc3686_defaults = {
|
||
|
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
|
||
|
|
CRYPTO_ALG_ASYNC |
|
||
|
|
CRYPTO_ALG_KERN_DRIVER_ONLY |
|
||
|
|
CRYPTO_ALG_NEED_FALLBACK,
|
||
|
|
.cra_blocksize = CTR_RFC3686_BLOCK_SIZE,
|
||
|
|
.cra_ctxsize = sizeof(struct ccp_ctx),
|
||
|
|
.cra_priority = CCP_CRA_PRIORITY,
|
||
|
|
.cra_type = &crypto_ablkcipher_type,
|
||
|
|
.cra_init = ccp_aes_rfc3686_cra_init,
|
||
|
|
.cra_exit = ccp_aes_rfc3686_cra_exit,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
.cra_ablkcipher = {
|
||
|
|
.setkey = ccp_aes_rfc3686_setkey,
|
||
|
|
.encrypt = ccp_aes_rfc3686_encrypt,
|
||
|
|
.decrypt = ccp_aes_rfc3686_decrypt,
|
||
|
|
.min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
|
||
|
|
.max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
struct ccp_aes_def {
|
||
|
|
enum ccp_aes_mode mode;
|
||
|
|
unsigned int version;
|
||
|
|
const char *name;
|
||
|
|
const char *driver_name;
|
||
|
|
unsigned int blocksize;
|
||
|
|
unsigned int ivsize;
|
||
|
|
struct crypto_alg *alg_defaults;
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct ccp_aes_def aes_algs[] = {
|
||
|
|
{
|
||
|
|
.mode = CCP_AES_MODE_ECB,
|
||
|
|
.version = CCP_VERSION(3, 0),
|
||
|
|
.name = "ecb(aes)",
|
||
|
|
.driver_name = "ecb-aes-ccp",
|
||
|
|
.blocksize = AES_BLOCK_SIZE,
|
||
|
|
.ivsize = 0,
|
||
|
|
.alg_defaults = &ccp_aes_defaults,
|
||
|
|
},
|
||
|
|
{
|
||
|
|
.mode = CCP_AES_MODE_CBC,
|
||
|
|
.version = CCP_VERSION(3, 0),
|
||
|
|
.name = "cbc(aes)",
|
||
|
|
.driver_name = "cbc-aes-ccp",
|
||
|
|
.blocksize = AES_BLOCK_SIZE,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.alg_defaults = &ccp_aes_defaults,
|
||
|
|
},
|
||
|
|
{
|
||
|
|
.mode = CCP_AES_MODE_CFB,
|
||
|
|
.version = CCP_VERSION(3, 0),
|
||
|
|
.name = "cfb(aes)",
|
||
|
|
.driver_name = "cfb-aes-ccp",
|
||
|
|
.blocksize = AES_BLOCK_SIZE,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.alg_defaults = &ccp_aes_defaults,
|
||
|
|
},
|
||
|
|
{
|
||
|
|
.mode = CCP_AES_MODE_OFB,
|
||
|
|
.version = CCP_VERSION(3, 0),
|
||
|
|
.name = "ofb(aes)",
|
||
|
|
.driver_name = "ofb-aes-ccp",
|
||
|
|
.blocksize = 1,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.alg_defaults = &ccp_aes_defaults,
|
||
|
|
},
|
||
|
|
{
|
||
|
|
.mode = CCP_AES_MODE_CTR,
|
||
|
|
.version = CCP_VERSION(3, 0),
|
||
|
|
.name = "ctr(aes)",
|
||
|
|
.driver_name = "ctr-aes-ccp",
|
||
|
|
.blocksize = 1,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.alg_defaults = &ccp_aes_defaults,
|
||
|
|
},
|
||
|
|
{
|
||
|
|
.mode = CCP_AES_MODE_CTR,
|
||
|
|
.version = CCP_VERSION(3, 0),
|
||
|
|
.name = "rfc3686(ctr(aes))",
|
||
|
|
.driver_name = "rfc3686-ctr-aes-ccp",
|
||
|
|
.blocksize = 1,
|
||
|
|
.ivsize = CTR_RFC3686_IV_SIZE,
|
||
|
|
.alg_defaults = &ccp_aes_rfc3686_defaults,
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
static int ccp_register_aes_alg(struct list_head *head,
|
||
|
|
const struct ccp_aes_def *def)
|
||
|
|
{
|
||
|
|
struct ccp_crypto_ablkcipher_alg *ccp_alg;
|
||
|
|
struct crypto_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->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
|
||
|
|
snprintf(alg->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
|
||
|
|
def->driver_name);
|
||
|
|
alg->cra_blocksize = def->blocksize;
|
||
|
|
alg->cra_ablkcipher.ivsize = def->ivsize;
|
||
|
|
|
||
|
|
ret = crypto_register_alg(alg);
|
||
|
|
if (ret) {
|
||
|
|
pr_err("%s ablkcipher algorithm registration error (%d)\n",
|
||
|
|
alg->cra_name, ret);
|
||
|
|
kfree(ccp_alg);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
list_add(&ccp_alg->entry, head);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int ccp_register_aes_algs(struct list_head *head)
|
||
|
|
{
|
||
|
|
int i, ret;
|
||
|
|
unsigned int ccpversion = ccp_version();
|
||
|
|
|
||
|
|
for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
|
||
|
|
if (aes_algs[i].version > ccpversion)
|
||
|
|
continue;
|
||
|
|
ret = ccp_register_aes_alg(head, &aes_algs[i]);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|