blob: e6eea488f11e21d92f45204505fe8af398d6d191 [file] [log] [blame]
/*
* Cipher algorithms supported by the CESA: DES, 3DES and AES.
*
* Author: Boris Brezillon <boris.brezillon@free-electrons.com>
* Author: Arnaud Ebalard <arno@natisbad.org>
*
* This work is based on an initial version written by
* Sebastian Andrzej Siewior < sebastian at breakpoint dot cc >
*
* 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 <crypto/aes.h>
#include "cesa.h"
struct mv_cesa_aes_ctx {
struct mv_cesa_ctx base;
struct crypto_aes_ctx aes;
};
static void mv_cesa_ablkcipher_std_step(struct ablkcipher_request *req)
{
struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(req);
struct mv_cesa_ablkcipher_std_req *sreq = &creq->req.std;
struct mv_cesa_engine *engine = sreq->base.engine;
size_t len = min_t(size_t, req->nbytes - sreq->offset,
CESA_SA_SRAM_PAYLOAD_SIZE);
len = sg_pcopy_to_buffer(req->src, creq->src_nents,
engine->sram + CESA_SA_DATA_SRAM_OFFSET,
len, sreq->offset);
sreq->size = len;
mv_cesa_set_crypt_op_len(&sreq->op, len);
/* FIXME: only update enc_len field */
if (!sreq->skip_ctx) {
memcpy(engine->sram, &sreq->op, sizeof(sreq->op));
sreq->skip_ctx = true;
} else {
memcpy(engine->sram, &sreq->op, sizeof(sreq->op.desc));
}
mv_cesa_set_int_mask(engine, CESA_SA_INT_ACCEL0_DONE);
writel(CESA_SA_CFG_PARA_DIS, engine->regs + CESA_SA_CFG);
writel(CESA_SA_CMD_EN_CESA_SA_ACCL0, engine->regs + CESA_SA_CMD);
}
static int mv_cesa_ablkcipher_std_process(struct ablkcipher_request *req,
u32 status)
{
struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(req);
struct mv_cesa_ablkcipher_std_req *sreq = &creq->req.std;
struct mv_cesa_engine *engine = sreq->base.engine;
size_t len;
len = sg_pcopy_from_buffer(req->dst, creq->dst_nents,
engine->sram + CESA_SA_DATA_SRAM_OFFSET,
sreq->size, sreq->offset);
sreq->offset += len;
if (sreq->offset < req->nbytes)
return -EINPROGRESS;
return 0;
}
static int mv_cesa_ablkcipher_process(struct crypto_async_request *req,
u32 status)
{
struct ablkcipher_request *ablkreq = ablkcipher_request_cast(req);
struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(ablkreq);
struct mv_cesa_ablkcipher_std_req *sreq = &creq->req.std;
struct mv_cesa_engine *engine = sreq->base.engine;
int ret;
ret = mv_cesa_ablkcipher_std_process(ablkreq, status);
if (ret)
return ret;
memcpy(ablkreq->info, engine->sram + CESA_SA_CRYPT_IV_SRAM_OFFSET,
crypto_ablkcipher_ivsize(crypto_ablkcipher_reqtfm(ablkreq)));
return 0;
}
static void mv_cesa_ablkcipher_step(struct crypto_async_request *req)
{
struct ablkcipher_request *ablkreq = ablkcipher_request_cast(req);
mv_cesa_ablkcipher_std_step(ablkreq);
}
static inline void
mv_cesa_ablkcipher_std_prepare(struct ablkcipher_request *req)
{
struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(req);
struct mv_cesa_ablkcipher_std_req *sreq = &creq->req.std;
struct mv_cesa_engine *engine = sreq->base.engine;
sreq->size = 0;
sreq->offset = 0;
mv_cesa_adjust_op(engine, &sreq->op);
memcpy(engine->sram, &sreq->op, sizeof(sreq->op));
}
static inline void mv_cesa_ablkcipher_prepare(struct crypto_async_request *req,
struct mv_cesa_engine *engine)
{
struct ablkcipher_request *ablkreq = ablkcipher_request_cast(req);
struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(ablkreq);
creq->req.base.engine = engine;
mv_cesa_ablkcipher_std_prepare(ablkreq);
}
static inline void
mv_cesa_ablkcipher_req_cleanup(struct crypto_async_request *req)
{
}
static const struct mv_cesa_req_ops mv_cesa_ablkcipher_req_ops = {
.step = mv_cesa_ablkcipher_step,
.process = mv_cesa_ablkcipher_process,
.prepare = mv_cesa_ablkcipher_prepare,
.cleanup = mv_cesa_ablkcipher_req_cleanup,
};
static int mv_cesa_ablkcipher_cra_init(struct crypto_tfm *tfm)
{
struct mv_cesa_aes_ctx *ctx = crypto_tfm_ctx(tfm);
ctx->base.ops = &mv_cesa_ablkcipher_req_ops;
tfm->crt_ablkcipher.reqsize = sizeof(struct mv_cesa_ablkcipher_req);
return 0;
}
static int mv_cesa_aes_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
unsigned int len)
{
struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
struct mv_cesa_aes_ctx *ctx = crypto_tfm_ctx(tfm);
int remaining;
int offset;
int ret;
int i;
ret = crypto_aes_expand_key(&ctx->aes, key, len);
if (ret) {
crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
return ret;
}
remaining = (ctx->aes.key_length - 16) / 4;
offset = ctx->aes.key_length + 24 - remaining;
for (i = 0; i < remaining; i++)
ctx->aes.key_dec[4 + i] =
cpu_to_le32(ctx->aes.key_enc[offset + i]);
return 0;
}
static inline int
mv_cesa_ablkcipher_std_req_init(struct ablkcipher_request *req,
const struct mv_cesa_op_ctx *op_templ)
{
struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(req);
struct mv_cesa_ablkcipher_std_req *sreq = &creq->req.std;
sreq->base.type = CESA_STD_REQ;
sreq->op = *op_templ;
sreq->skip_ctx = false;
return 0;
}
static int mv_cesa_ablkcipher_req_init(struct ablkcipher_request *req,
struct mv_cesa_op_ctx *tmpl)
{
struct mv_cesa_ablkcipher_req *creq = ablkcipher_request_ctx(req);
struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
unsigned int blksize = crypto_ablkcipher_blocksize(tfm);
if (!IS_ALIGNED(req->nbytes, blksize))
return -EINVAL;
creq->src_nents = sg_nents_for_len(req->src, req->nbytes);
creq->dst_nents = sg_nents_for_len(req->dst, req->nbytes);
mv_cesa_update_op_cfg(tmpl, CESA_SA_DESC_CFG_OP_CRYPT_ONLY,
CESA_SA_DESC_CFG_OP_MSK);
return mv_cesa_ablkcipher_std_req_init(req, tmpl);
}
static int mv_cesa_aes_op(struct ablkcipher_request *req,
struct mv_cesa_op_ctx *tmpl)
{
struct mv_cesa_aes_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
int ret, i;
u32 *key;
u32 cfg;
cfg = CESA_SA_DESC_CFG_CRYPTM_AES;
if (mv_cesa_get_op_cfg(tmpl) & CESA_SA_DESC_CFG_DIR_DEC)
key = ctx->aes.key_dec;
else
key = ctx->aes.key_enc;
for (i = 0; i < ctx->aes.key_length / sizeof(u32); i++)
tmpl->ctx.blkcipher.key[i] = cpu_to_le32(key[i]);
if (ctx->aes.key_length == 24)
cfg |= CESA_SA_DESC_CFG_AES_LEN_192;
else if (ctx->aes.key_length == 32)
cfg |= CESA_SA_DESC_CFG_AES_LEN_256;
mv_cesa_update_op_cfg(tmpl, cfg,
CESA_SA_DESC_CFG_CRYPTM_MSK |
CESA_SA_DESC_CFG_AES_LEN_MSK);
ret = mv_cesa_ablkcipher_req_init(req, tmpl);
if (ret)
return ret;
return mv_cesa_queue_req(&req->base);
}
static int mv_cesa_ecb_aes_encrypt(struct ablkcipher_request *req)
{
struct mv_cesa_op_ctx tmpl;
mv_cesa_set_op_cfg(&tmpl,
CESA_SA_DESC_CFG_CRYPTCM_ECB |
CESA_SA_DESC_CFG_DIR_ENC);
return mv_cesa_aes_op(req, &tmpl);
}
static int mv_cesa_ecb_aes_decrypt(struct ablkcipher_request *req)
{
struct mv_cesa_op_ctx tmpl;
mv_cesa_set_op_cfg(&tmpl,
CESA_SA_DESC_CFG_CRYPTCM_ECB |
CESA_SA_DESC_CFG_DIR_DEC);
return mv_cesa_aes_op(req, &tmpl);
}
struct crypto_alg mv_cesa_ecb_aes_alg = {
.cra_name = "ecb(aes)",
.cra_driver_name = "mv-ecb-aes",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
CRYPTO_ALG_KERN_DRIVER_ONLY | CRYPTO_ALG_ASYNC,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct mv_cesa_aes_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = mv_cesa_ablkcipher_cra_init,
.cra_u = {
.ablkcipher = {
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.setkey = mv_cesa_aes_setkey,
.encrypt = mv_cesa_ecb_aes_encrypt,
.decrypt = mv_cesa_ecb_aes_decrypt,
},
},
};
static int mv_cesa_cbc_aes_op(struct ablkcipher_request *req,
struct mv_cesa_op_ctx *tmpl)
{
mv_cesa_update_op_cfg(tmpl, CESA_SA_DESC_CFG_CRYPTCM_CBC,
CESA_SA_DESC_CFG_CRYPTCM_MSK);
memcpy(tmpl->ctx.blkcipher.iv, req->info, AES_BLOCK_SIZE);
return mv_cesa_aes_op(req, tmpl);
}
static int mv_cesa_cbc_aes_encrypt(struct ablkcipher_request *req)
{
struct mv_cesa_op_ctx tmpl;
mv_cesa_set_op_cfg(&tmpl, CESA_SA_DESC_CFG_DIR_ENC);
return mv_cesa_cbc_aes_op(req, &tmpl);
}
static int mv_cesa_cbc_aes_decrypt(struct ablkcipher_request *req)
{
struct mv_cesa_op_ctx tmpl;
mv_cesa_set_op_cfg(&tmpl, CESA_SA_DESC_CFG_DIR_DEC);
return mv_cesa_cbc_aes_op(req, &tmpl);
}
struct crypto_alg mv_cesa_cbc_aes_alg = {
.cra_name = "cbc(aes)",
.cra_driver_name = "mv-cbc-aes",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
CRYPTO_ALG_KERN_DRIVER_ONLY | CRYPTO_ALG_ASYNC,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct mv_cesa_aes_ctx),
.cra_alignmask = 0,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = mv_cesa_ablkcipher_cra_init,
.cra_u = {
.ablkcipher = {
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = mv_cesa_aes_setkey,
.encrypt = mv_cesa_cbc_aes_encrypt,
.decrypt = mv_cesa_cbc_aes_decrypt,
},
},
};