#include <crypto/aes.h>
#include <crypto/ctr.h>
#include <crypto/internal/skcipher.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/string.h>
#include "ccp-crypto.h"
static int ccp_aes_complete(struct crypto_async_request *async_req, int ret)
{
struct skcipher_request *req = skcipher_request_cast(async_req);
struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(
crypto_skcipher_reqtfm(req));
struct ccp_aes_req_ctx *rctx = skcipher_request_ctx_dma(req);
if (ret)
return ret;
if (ctx->u.aes.mode != CCP_AES_MODE_ECB)
memcpy(req->iv, rctx->iv, AES_BLOCK_SIZE);
return 0;
}
static int ccp_aes_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_dma(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:
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 skcipher_request *req, bool encrypt)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(tfm);
struct ccp_aes_req_ctx *rctx = skcipher_request_ctx_dma(req);
struct scatterlist *iv_sg = NULL;
unsigned int iv_len = 0;
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)) &&
(req->cryptlen & (AES_BLOCK_SIZE - 1)))
return -EINVAL;
if (ctx->u.aes.mode != CCP_AES_MODE_ECB) {
if (!req->iv)
return -EINVAL;
memcpy(rctx->iv, req->iv, 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->cryptlen;
rctx->cmd.u.aes.dst = req->dst;
return ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
}
static int ccp_aes_encrypt(struct skcipher_request *req)
{
return ccp_aes_crypt(req, true);
}
static int ccp_aes_decrypt(struct skcipher_request *req)
{
return ccp_aes_crypt(req, false);
}
static int ccp_aes_init_tfm(struct crypto_skcipher *tfm)
{
struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(tfm);
ctx->complete = ccp_aes_complete;
ctx->u.aes.key_len = 0;
crypto_skcipher_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx));
return 0;
}
static int ccp_aes_rfc3686_complete(struct crypto_async_request *async_req,
int ret)
{
struct skcipher_request *req = skcipher_request_cast(async_req);
struct ccp_aes_req_ctx *rctx = skcipher_request_ctx_dma(req);
req->iv = rctx->rfc3686_info;
return ccp_aes_complete(async_req, ret);
}
static int ccp_aes_rfc3686_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int key_len)
{
struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(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 skcipher_request *req, bool encrypt)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(tfm);
struct ccp_aes_req_ctx *rctx = skcipher_request_ctx_dma(req);
u8 *iv;
iv = rctx->rfc3686_iv;
memcpy(iv, ctx->u.aes.nonce, CTR_RFC3686_NONCE_SIZE);
iv += CTR_RFC3686_NONCE_SIZE;
memcpy(iv, req->iv, CTR_RFC3686_IV_SIZE);
iv += CTR_RFC3686_IV_SIZE;
*(__be32 *)iv = cpu_to_be32(1);
rctx->rfc3686_info = req->iv;
req->iv = rctx->rfc3686_iv;
return ccp_aes_crypt(req, encrypt);
}
static int ccp_aes_rfc3686_encrypt(struct skcipher_request *req)
{
return ccp_aes_rfc3686_crypt(req, true);
}
static int ccp_aes_rfc3686_decrypt(struct skcipher_request *req)
{
return ccp_aes_rfc3686_crypt(req, false);
}
static int ccp_aes_rfc3686_init_tfm(struct crypto_skcipher *tfm)
{
struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(tfm);
ctx->complete = ccp_aes_rfc3686_complete;
ctx->u.aes.key_len = 0;
crypto_skcipher_set_reqsize_dma(tfm, sizeof(struct ccp_aes_req_ctx));
return 0;
}
static const struct skcipher_alg ccp_aes_defaults = {
.setkey = ccp_aes_setkey,
.encrypt = ccp_aes_encrypt,
.decrypt = ccp_aes_decrypt,
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.init = ccp_aes_init_tfm,
.base.cra_flags = CRYPTO_ALG_ASYNC |
CRYPTO_ALG_ALLOCATES_MEMORY |
CRYPTO_ALG_KERN_DRIVER_ONLY |
CRYPTO_ALG_NEED_FALLBACK,
.base.cra_blocksize = AES_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct ccp_ctx) + CRYPTO_DMA_PADDING,
.base.cra_priority = CCP_CRA_PRIORITY,
.base.cra_module = THIS_MODULE,
};
static const struct skcipher_alg ccp_aes_rfc3686_defaults = {
.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,
.init = ccp_aes_rfc3686_init_tfm,
.base.cra_flags = CRYPTO_ALG_ASYNC |
CRYPTO_ALG_ALLOCATES_MEMORY |
CRYPTO_ALG_KERN_DRIVER_ONLY |
CRYPTO_ALG_NEED_FALLBACK,
.base.cra_blocksize = CTR_RFC3686_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct ccp_ctx) + CRYPTO_DMA_PADDING,
.base.cra_priority = CCP_CRA_PRIORITY,
.base.cra_module = THIS_MODULE,
};
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;
const struct skcipher_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_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_skcipher_alg *ccp_alg;
struct skcipher_alg *alg;
int ret;
ccp_alg = kzalloc_obj(*ccp_alg);
if (!ccp_alg)
return -ENOMEM;
INIT_LIST_HEAD(&ccp_alg->entry);
ccp_alg->mode = def->mode;
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_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;
}
