drivers/crypto/amcc/crypto4xx_alg.c - kernel/msm-4.9 - Gitiles

 /**
  * 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, (cm == CRYPTO_MODE_CBC ?
 				 SA_SAVE_IV : 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);
 }
	/**
	* 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, (cm == CRYPTO_MODE_CBC ?
	SA_SAVE_IV : 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);
	}