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/**
* AMCC SoC PPC4xx Crypto Driver
*
* Copyright (c) 2008 Applied Micro Circuits Corporation.
* All rights reserved. James Hsiao <jhsiao@amcc.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* This file implements the Linux crypto algorithms.
*/
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/spinlock_types.h>
#include <linux/scatterlist.h>
#include <linux/crypto.h>
#include <linux/hash.h>
#include <crypto/internal/hash.h>
#include <linux/dma-mapping.h>
#include <crypto/algapi.h>
#include <crypto/aes.h>
#include <crypto/sha.h>
#include "crypto4xx_reg_def.h"
#include "crypto4xx_sa.h"
#include "crypto4xx_core.h"
static void set_dynamic_sa_command_0(struct dynamic_sa_ctl *sa, u32 save_h,
u32 save_iv, u32 ld_h, u32 ld_iv,
u32 hdr_proc, u32 h, u32 c, u32 pad_type,
u32 op_grp, u32 op, u32 dir)
{
sa->sa_command_0.w = 0;
sa->sa_command_0.bf.save_hash_state = save_h;
sa->sa_command_0.bf.save_iv = save_iv;
sa->sa_command_0.bf.load_hash_state = ld_h;
sa->sa_command_0.bf.load_iv = ld_iv;
sa->sa_command_0.bf.hdr_proc = hdr_proc;
sa->sa_command_0.bf.hash_alg = h;
sa->sa_command_0.bf.cipher_alg = c;
sa->sa_command_0.bf.pad_type = pad_type & 3;
sa->sa_command_0.bf.extend_pad = pad_type >> 2;
sa->sa_command_0.bf.op_group = op_grp;
sa->sa_command_0.bf.opcode = op;
sa->sa_command_0.bf.dir = dir;
}
static void set_dynamic_sa_command_1(struct dynamic_sa_ctl *sa, u32 cm,
u32 hmac_mc, u32 cfb, u32 esn,
u32 sn_mask, u32 mute, u32 cp_pad,
u32 cp_pay, u32 cp_hdr)
{
sa->sa_command_1.w = 0;
sa->sa_command_1.bf.crypto_mode31 = (cm & 4) >> 2;
sa->sa_command_1.bf.crypto_mode9_8 = cm & 3;
sa->sa_command_1.bf.feedback_mode = cfb,
sa->sa_command_1.bf.sa_rev = 1;
sa->sa_command_1.bf.extended_seq_num = esn;
sa->sa_command_1.bf.seq_num_mask = sn_mask;
sa->sa_command_1.bf.mutable_bit_proc = mute;
sa->sa_command_1.bf.copy_pad = cp_pad;
sa->sa_command_1.bf.copy_payload = cp_pay;
sa->sa_command_1.bf.copy_hdr = cp_hdr;
}
int crypto4xx_encrypt(struct ablkcipher_request *req)
{
struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
ctx->direction = DIR_OUTBOUND;
ctx->hash_final = 0;
ctx->is_hash = 0;
ctx->pd_ctl = 0x1;
return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
req->nbytes, req->info,
get_dynamic_sa_iv_size(ctx));
}
int crypto4xx_decrypt(struct ablkcipher_request *req)
{
struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
ctx->direction = DIR_INBOUND;
ctx->hash_final = 0;
ctx->is_hash = 0;
ctx->pd_ctl = 1;
return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
req->nbytes, req->info,
get_dynamic_sa_iv_size(ctx));
}
/**
* AES Functions
*/
static int crypto4xx_setkey_aes(struct crypto_ablkcipher *cipher,
const u8 *key,
unsigned int keylen,
unsigned char cm,
u8 fb)
{
struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
struct dynamic_sa_ctl *sa;
int rc;
if (keylen != AES_KEYSIZE_256 &&
keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_128) {
crypto_ablkcipher_set_flags(cipher,
CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
/* Create SA */
if (ctx->sa_in_dma_addr || ctx->sa_out_dma_addr)
crypto4xx_free_sa(ctx);
rc = crypto4xx_alloc_sa(ctx, SA_AES128_LEN + (keylen-16) / 4);
if (rc)
return rc;
if (ctx->state_record_dma_addr == 0) {
rc = crypto4xx_alloc_state_record(ctx);
if (rc) {
crypto4xx_free_sa(ctx);
return rc;
}
}
/* Setup SA */
sa = (struct dynamic_sa_ctl *) ctx->sa_in;
ctx->hash_final = 0;
set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, SA_NOT_SAVE_IV,
SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
SA_NO_HEADER_PROC, SA_HASH_ALG_NULL,
SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO,
SA_OP_GROUP_BASIC, SA_OPCODE_DECRYPT,
DIR_INBOUND);
set_dynamic_sa_command_1(sa, cm, SA_HASH_MODE_HASH,
fb, SA_EXTENDED_SN_OFF,
SA_SEQ_MASK_OFF, SA_MC_ENABLE,
SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
SA_NOT_COPY_HDR);
crypto4xx_memcpy_le(ctx->sa_in + get_dynamic_sa_offset_key_field(ctx),
key, keylen);
sa->sa_contents = SA_AES_CONTENTS | (keylen << 2);
sa->sa_command_1.bf.key_len = keylen >> 3;
ctx->is_hash = 0;
ctx->direction = DIR_INBOUND;
memcpy(ctx->sa_in + get_dynamic_sa_offset_state_ptr_field(ctx),
(void *)&ctx->state_record_dma_addr, 4);
ctx->offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(ctx);
memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
sa = (struct dynamic_sa_ctl *) ctx->sa_out;
sa->sa_command_0.bf.dir = DIR_OUTBOUND;
return 0;
}
int crypto4xx_setkey_aes_cbc(struct crypto_ablkcipher *cipher,
const u8 *key, unsigned int keylen)
{
return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_CBC,
CRYPTO_FEEDBACK_MODE_NO_FB);
}
/**
* HASH SHA1 Functions
*/
static int crypto4xx_hash_alg_init(struct crypto_tfm *tfm,
unsigned int sa_len,
unsigned char ha,
unsigned char hm)
{
struct crypto_alg *alg = tfm->__crt_alg;
struct crypto4xx_alg *my_alg = crypto_alg_to_crypto4xx_alg(alg);
struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
struct dynamic_sa_ctl *sa;
struct dynamic_sa_hash160 *sa_in;
int rc;
ctx->dev = my_alg->dev;
ctx->is_hash = 1;
ctx->hash_final = 0;
/* Create SA */
if (ctx->sa_in_dma_addr || ctx->sa_out_dma_addr)
crypto4xx_free_sa(ctx);
rc = crypto4xx_alloc_sa(ctx, sa_len);
if (rc)
return rc;
if (ctx->state_record_dma_addr == 0) {
crypto4xx_alloc_state_record(ctx);
if (!ctx->state_record_dma_addr) {
crypto4xx_free_sa(ctx);
return -ENOMEM;
}
}
crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
sizeof(struct crypto4xx_ctx));
sa = (struct dynamic_sa_ctl *) ctx->sa_in;
set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
SA_NOT_LOAD_HASH, SA_LOAD_IV_FROM_SA,
SA_NO_HEADER_PROC, ha, SA_CIPHER_ALG_NULL,
SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
SA_OPCODE_HASH, DIR_INBOUND);
set_dynamic_sa_command_1(sa, 0, SA_HASH_MODE_HASH,
CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
SA_SEQ_MASK_OFF, SA_MC_ENABLE,
SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
SA_NOT_COPY_HDR);
ctx->direction = DIR_INBOUND;
sa->sa_contents = SA_HASH160_CONTENTS;
sa_in = (struct dynamic_sa_hash160 *) ctx->sa_in;
/* Need to zero hash digest in SA */
memset(sa_in->inner_digest, 0, sizeof(sa_in->inner_digest));
memset(sa_in->outer_digest, 0, sizeof(sa_in->outer_digest));
sa_in->state_ptr = ctx->state_record_dma_addr;
ctx->offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(ctx);
return 0;
}
int crypto4xx_hash_init(struct ahash_request *req)
{
struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
int ds;
struct dynamic_sa_ctl *sa;
sa = (struct dynamic_sa_ctl *) ctx->sa_in;
ds = crypto_ahash_digestsize(
__crypto_ahash_cast(req->base.tfm));
sa->sa_command_0.bf.digest_len = ds >> 2;
sa->sa_command_0.bf.load_hash_state = SA_LOAD_HASH_FROM_SA;
ctx->is_hash = 1;
ctx->direction = DIR_INBOUND;
return 0;
}
int crypto4xx_hash_update(struct ahash_request *req)
{
struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
ctx->is_hash = 1;
ctx->hash_final = 0;
ctx->pd_ctl = 0x11;
ctx->direction = DIR_INBOUND;
return crypto4xx_build_pd(&req->base, ctx, req->src,
(struct scatterlist *) req->result,
req->nbytes, NULL, 0);
}
int crypto4xx_hash_final(struct ahash_request *req)
{
return 0;
}
int crypto4xx_hash_digest(struct ahash_request *req)
{
struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
ctx->hash_final = 1;
ctx->pd_ctl = 0x11;
ctx->direction = DIR_INBOUND;
return crypto4xx_build_pd(&req->base, ctx, req->src,
(struct scatterlist *) req->result,
req->nbytes, NULL, 0);
}
/**
* SHA1 Algorithm
*/
int crypto4xx_sha1_alg_init(struct crypto_tfm *tfm)
{
return crypto4xx_hash_alg_init(tfm, SA_HASH160_LEN, SA_HASH_ALG_SHA1,
SA_HASH_MODE_HASH);
}
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