drivers/crypto/nx/nx-sha256.c - linux - Git at Google

 /**
  * SHA-256 routines supporting the Power 7+ Nest Accelerators driver
  *
  * Copyright (C) 2011-2012 International Business Machines Inc.
  *
  * 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; version 2 only.
  *
  * 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  *
  * Author: Kent Yoder <yoder1@us.ibm.com>
  */

 #include <crypto/internal/hash.h>
 #include <crypto/sha.h>
 #include <linux/module.h>
 #include <asm/vio.h>
 #include <asm/byteorder.h>

 #include "nx_csbcpb.h"
 #include "nx.h"


 static int nx_crypto_ctx_sha256_init(struct crypto_tfm *tfm)
 {
 	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
 	int err;

 	err = nx_crypto_ctx_sha_init(tfm);
 	if (err)
 		return err;

 	nx_ctx_init(nx_ctx, HCOP_FC_SHA);

 	nx_ctx->ap = &nx_ctx->props[NX_PROPS_SHA256];

 	NX_CPB_SET_DIGEST_SIZE(nx_ctx->csbcpb, NX_DS_SHA256);

 	return 0;
 }

 static int nx_sha256_init(struct shash_desc *desc) {
 	struct sha256_state *sctx = shash_desc_ctx(desc);

 	memset(sctx, 0, sizeof *sctx);

 	sctx->state[0] = __cpu_to_be32(SHA256_H0);
 	sctx->state[1] = __cpu_to_be32(SHA256_H1);
 	sctx->state[2] = __cpu_to_be32(SHA256_H2);
 	sctx->state[3] = __cpu_to_be32(SHA256_H3);
 	sctx->state[4] = __cpu_to_be32(SHA256_H4);
 	sctx->state[5] = __cpu_to_be32(SHA256_H5);
 	sctx->state[6] = __cpu_to_be32(SHA256_H6);
 	sctx->state[7] = __cpu_to_be32(SHA256_H7);
 	sctx->count = 0;

 	return 0;
 }

 static int nx_sha256_update(struct shash_desc *desc, const u8 *data,
 			    unsigned int len)
 {
 	struct sha256_state *sctx = shash_desc_ctx(desc);
 	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
 	struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
 	struct nx_sg *out_sg;
 	u64 to_process = 0, leftover, total;
 	unsigned long irq_flags;
 	int rc = 0;
 	int data_len;
 	u32 max_sg_len;
 	u64 buf_len = (sctx->count % SHA256_BLOCK_SIZE);

 	spin_lock_irqsave(&nx_ctx->lock, irq_flags);

 	/* 2 cases for total data len:
 	 *  1: < SHA256_BLOCK_SIZE: copy into state, return 0
 	 *  2: >= SHA256_BLOCK_SIZE: process X blocks, copy in leftover
 	 */
 	total = (sctx->count % SHA256_BLOCK_SIZE) + len;
 	if (total < SHA256_BLOCK_SIZE) {
 		memcpy(sctx->buf + buf_len, data, len);
 		sctx->count += len;
 		goto out;
 	}

 	memcpy(csbcpb->cpb.sha256.message_digest, sctx->state, SHA256_DIGEST_SIZE);
 	NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
 	NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;

 	max_sg_len = min_t(u64, nx_ctx->ap->sglen,
 			nx_driver.of.max_sg_len/sizeof(struct nx_sg));
 	max_sg_len = min_t(u64, max_sg_len,
 			nx_ctx->ap->databytelen/NX_PAGE_SIZE);

 	data_len = SHA256_DIGEST_SIZE;
 	out_sg = nx_build_sg_list(nx_ctx->out_sg, (u8 *)sctx->state,
 				  &data_len, max_sg_len);
 	nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);

 	if (data_len != SHA256_DIGEST_SIZE) {
 		rc = -EINVAL;
 		goto out;
 	}

 	do {
 		int used_sgs = 0;
 		struct nx_sg *in_sg = nx_ctx->in_sg;

 		if (buf_len) {
 			data_len = buf_len;
 			in_sg = nx_build_sg_list(in_sg,
 						 (u8 *) sctx->buf,
 						 &data_len,
 						 max_sg_len);

 			if (data_len != buf_len) {
 				rc = -EINVAL;
 				goto out;
 			}
 			used_sgs = in_sg - nx_ctx->in_sg;
 		}

 		/* to_process: SHA256_BLOCK_SIZE aligned chunk to be
 		 * processed in this iteration. This value is restricted
 		 * by sg list limits and number of sgs we already used
 		 * for leftover data. (see above)
 		 * In ideal case, we could allow NX_PAGE_SIZE * max_sg_len,
 		 * but because data may not be aligned, we need to account
 		 * for that too. */
 		to_process = min_t(u64, total,
 			(max_sg_len - 1 - used_sgs) * NX_PAGE_SIZE);
 		to_process = to_process & ~(SHA256_BLOCK_SIZE - 1);

 		data_len = to_process - buf_len;
 		in_sg = nx_build_sg_list(in_sg, (u8 *) data,
 					 &data_len, max_sg_len);

 		nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg);

 		to_process = data_len + buf_len;
 		leftover = total - to_process;

 		/*
 		 * we've hit the nx chip previously and we're updating
 		 * again, so copy over the partial digest.
 		 */
 		memcpy(csbcpb->cpb.sha256.input_partial_digest,
 			       csbcpb->cpb.sha256.message_digest,
 			       SHA256_DIGEST_SIZE);

 		if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
 			rc = -EINVAL;
 			goto out;
 		}

 		rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
 				   desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
 		if (rc)
 			goto out;

 		atomic_inc(&(nx_ctx->stats->sha256_ops));

 		total -= to_process;
 		data += to_process - buf_len;
 		buf_len = 0;

 	} while (leftover >= SHA256_BLOCK_SIZE);

 	/* copy the leftover back into the state struct */
 	if (leftover)
 		memcpy(sctx->buf, data, leftover);

 	sctx->count += len;
 	memcpy(sctx->state, csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE);
 out:
 	spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
 	return rc;
 }

 static int nx_sha256_final(struct shash_desc *desc, u8 *out)
 {
 	struct sha256_state *sctx = shash_desc_ctx(desc);
 	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
 	struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
 	struct nx_sg *in_sg, *out_sg;
 	unsigned long irq_flags;
 	u32 max_sg_len;
 	int rc = 0;
 	int len;

 	spin_lock_irqsave(&nx_ctx->lock, irq_flags);

 	max_sg_len = min_t(u64, nx_ctx->ap->sglen,
 			nx_driver.of.max_sg_len/sizeof(struct nx_sg));
 	max_sg_len = min_t(u64, max_sg_len,
 			nx_ctx->ap->databytelen/NX_PAGE_SIZE);

 	/* final is represented by continuing the operation and indicating that
 	 * this is not an intermediate operation */
 	if (sctx->count >= SHA256_BLOCK_SIZE) {
 		/* we've hit the nx chip previously, now we're finalizing,
 		 * so copy over the partial digest */
 		memcpy(csbcpb->cpb.sha256.input_partial_digest, sctx->state, SHA256_DIGEST_SIZE);
 		NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
 		NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
 	} else {
 		NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
 		NX_CPB_FDM(csbcpb) &= ~NX_FDM_CONTINUATION;
 	}

 	csbcpb->cpb.sha256.message_bit_length = (u64) (sctx->count * 8);

 	len = sctx->count & (SHA256_BLOCK_SIZE - 1);
 	in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *) sctx->buf,
 				 &len, max_sg_len);

 	if (len != (sctx->count & (SHA256_BLOCK_SIZE - 1))) {
 		rc = -EINVAL;
 		goto out;
 	}

 	len = SHA256_DIGEST_SIZE;
 	out_sg = nx_build_sg_list(nx_ctx->out_sg, out, &len, max_sg_len);

 	if (len != SHA256_DIGEST_SIZE) {
 		rc = -EINVAL;
 		goto out;
 	}

 	nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg);
 	nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
 	if (!nx_ctx->op.outlen) {
 		rc = -EINVAL;
 		goto out;
 	}

 	rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
 			   desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
 	if (rc)
 		goto out;

 	atomic_inc(&(nx_ctx->stats->sha256_ops));

 	atomic64_add(sctx->count, &(nx_ctx->stats->sha256_bytes));
 	memcpy(out, csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE);
 out:
 	spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
 	return rc;
 }

 static int nx_sha256_export(struct shash_desc *desc, void *out)
 {
 	struct sha256_state *sctx = shash_desc_ctx(desc);

 	memcpy(out, sctx, sizeof(*sctx));

 	return 0;
 }

 static int nx_sha256_import(struct shash_desc *desc, const void *in)
 {
 	struct sha256_state *sctx = shash_desc_ctx(desc);

 	memcpy(sctx, in, sizeof(*sctx));

 	return 0;
 }

 struct shash_alg nx_shash_sha256_alg = {
 	.digestsize = SHA256_DIGEST_SIZE,
 	.init       = nx_sha256_init,
 	.update     = nx_sha256_update,
 	.final      = nx_sha256_final,
 	.export     = nx_sha256_export,
 	.import     = nx_sha256_import,
 	.descsize   = sizeof(struct sha256_state),
 	.statesize  = sizeof(struct sha256_state),
 	.base       = {
 		.cra_name        = "sha256",
 		.cra_driver_name = "sha256-nx",
 		.cra_priority    = 300,
 		.cra_blocksize   = SHA256_BLOCK_SIZE,
 		.cra_module      = THIS_MODULE,
 		.cra_ctxsize     = sizeof(struct nx_crypto_ctx),
 		.cra_init        = nx_crypto_ctx_sha256_init,
 		.cra_exit        = nx_crypto_ctx_exit,
 	}
 };
	/**
	* SHA-256 routines supporting the Power 7+ Nest Accelerators driver
	*
	* Copyright (C) 2011-2012 International Business Machines Inc.
	*
	* 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; version 2 only.
	*
	* 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	*
	* Author: Kent Yoder <yoder1@us.ibm.com>
	*/

	#include <crypto/internal/hash.h>
	#include <crypto/sha.h>
	#include <linux/module.h>
	#include <asm/vio.h>
	#include <asm/byteorder.h>

	#include "nx_csbcpb.h"
	#include "nx.h"


	static int nx_crypto_ctx_sha256_init(struct crypto_tfm *tfm)
	{
	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
	int err;

	err = nx_crypto_ctx_sha_init(tfm);
	if (err)
	return err;

	nx_ctx_init(nx_ctx, HCOP_FC_SHA);

	nx_ctx->ap = &nx_ctx->props[NX_PROPS_SHA256];

	NX_CPB_SET_DIGEST_SIZE(nx_ctx->csbcpb, NX_DS_SHA256);

	return 0;
	}

	static int nx_sha256_init(struct shash_desc *desc) {
	struct sha256_state *sctx = shash_desc_ctx(desc);

	memset(sctx, 0, sizeof *sctx);

	sctx->state[0] = __cpu_to_be32(SHA256_H0);
	sctx->state[1] = __cpu_to_be32(SHA256_H1);
	sctx->state[2] = __cpu_to_be32(SHA256_H2);
	sctx->state[3] = __cpu_to_be32(SHA256_H3);
	sctx->state[4] = __cpu_to_be32(SHA256_H4);
	sctx->state[5] = __cpu_to_be32(SHA256_H5);
	sctx->state[6] = __cpu_to_be32(SHA256_H6);
	sctx->state[7] = __cpu_to_be32(SHA256_H7);
	sctx->count = 0;

	return 0;
	}

	static int nx_sha256_update(struct shash_desc desc, const u8 data,
	unsigned int len)
	{
	struct sha256_state *sctx = shash_desc_ctx(desc);
	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
	struct nx_csbcpb csbcpb = (struct nx_csbcpb )nx_ctx->csbcpb;
	struct nx_sg *out_sg;
	u64 to_process = 0, leftover, total;
	unsigned long irq_flags;
	int rc = 0;
	int data_len;
	u32 max_sg_len;
	u64 buf_len = (sctx->count % SHA256_BLOCK_SIZE);

	spin_lock_irqsave(&nx_ctx->lock, irq_flags);

	/* 2 cases for total data len:
	* 1: < SHA256_BLOCK_SIZE: copy into state, return 0
	* 2: >= SHA256_BLOCK_SIZE: process X blocks, copy in leftover
	*/
	total = (sctx->count % SHA256_BLOCK_SIZE) + len;
	if (total < SHA256_BLOCK_SIZE) {
	memcpy(sctx->buf + buf_len, data, len);
	sctx->count += len;
	goto out;
	}

	memcpy(csbcpb->cpb.sha256.message_digest, sctx->state, SHA256_DIGEST_SIZE);
	NX_CPB_FDM(csbcpb) \|= NX_FDM_INTERMEDIATE;
	NX_CPB_FDM(csbcpb) \|= NX_FDM_CONTINUATION;

	max_sg_len = min_t(u64, nx_ctx->ap->sglen,
	nx_driver.of.max_sg_len/sizeof(struct nx_sg));
	max_sg_len = min_t(u64, max_sg_len,
	nx_ctx->ap->databytelen/NX_PAGE_SIZE);

	data_len = SHA256_DIGEST_SIZE;
	out_sg = nx_build_sg_list(nx_ctx->out_sg, (u8 *)sctx->state,
	&data_len, max_sg_len);
	nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);

	if (data_len != SHA256_DIGEST_SIZE) {
	rc = -EINVAL;
	goto out;
	}

	do {
	int used_sgs = 0;
	struct nx_sg *in_sg = nx_ctx->in_sg;

	if (buf_len) {
	data_len = buf_len;
	in_sg = nx_build_sg_list(in_sg,
	(u8 *) sctx->buf,
	&data_len,
	max_sg_len);

	if (data_len != buf_len) {
	rc = -EINVAL;
	goto out;
	}
	used_sgs = in_sg - nx_ctx->in_sg;
	}

	/* to_process: SHA256_BLOCK_SIZE aligned chunk to be
	* processed in this iteration. This value is restricted
	* by sg list limits and number of sgs we already used
	* for leftover data. (see above)
	* In ideal case, we could allow NX_PAGE_SIZE * max_sg_len,
	* but because data may not be aligned, we need to account
	* for that too. */
	to_process = min_t(u64, total,
	(max_sg_len - 1 - used_sgs) * NX_PAGE_SIZE);
	to_process = to_process & ~(SHA256_BLOCK_SIZE - 1);

	data_len = to_process - buf_len;
	in_sg = nx_build_sg_list(in_sg, (u8 *) data,
	&data_len, max_sg_len);

	nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg);

	to_process = data_len + buf_len;
	leftover = total - to_process;

	/*
	* we've hit the nx chip previously and we're updating
	* again, so copy over the partial digest.
	*/
	memcpy(csbcpb->cpb.sha256.input_partial_digest,
	csbcpb->cpb.sha256.message_digest,
	SHA256_DIGEST_SIZE);

	if (!nx_ctx->op.inlen \|\| !nx_ctx->op.outlen) {
	rc = -EINVAL;
	goto out;
	}

	rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
	desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
	if (rc)
	goto out;

	atomic_inc(&(nx_ctx->stats->sha256_ops));

	total -= to_process;
	data += to_process - buf_len;
	buf_len = 0;

	} while (leftover >= SHA256_BLOCK_SIZE);

	/* copy the leftover back into the state struct */
	if (leftover)
	memcpy(sctx->buf, data, leftover);

	sctx->count += len;
	memcpy(sctx->state, csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE);
	out:
	spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
	return rc;
	}

	static int nx_sha256_final(struct shash_desc desc, u8 out)
	{
	struct sha256_state *sctx = shash_desc_ctx(desc);
	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
	struct nx_csbcpb csbcpb = (struct nx_csbcpb )nx_ctx->csbcpb;
	struct nx_sg in_sg, out_sg;
	unsigned long irq_flags;
	u32 max_sg_len;
	int rc = 0;
	int len;

	spin_lock_irqsave(&nx_ctx->lock, irq_flags);

	max_sg_len = min_t(u64, nx_ctx->ap->sglen,
	nx_driver.of.max_sg_len/sizeof(struct nx_sg));
	max_sg_len = min_t(u64, max_sg_len,
	nx_ctx->ap->databytelen/NX_PAGE_SIZE);

	/* final is represented by continuing the operation and indicating that
	* this is not an intermediate operation */
	if (sctx->count >= SHA256_BLOCK_SIZE) {
	/* we've hit the nx chip previously, now we're finalizing,
	* so copy over the partial digest */
	memcpy(csbcpb->cpb.sha256.input_partial_digest, sctx->state, SHA256_DIGEST_SIZE);
	NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
	NX_CPB_FDM(csbcpb) \|= NX_FDM_CONTINUATION;
	} else {
	NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
	NX_CPB_FDM(csbcpb) &= ~NX_FDM_CONTINUATION;
	}

	csbcpb->cpb.sha256.message_bit_length = (u64) (sctx->count * 8);

	len = sctx->count & (SHA256_BLOCK_SIZE - 1);
	in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *) sctx->buf,
	&len, max_sg_len);

	if (len != (sctx->count & (SHA256_BLOCK_SIZE - 1))) {
	rc = -EINVAL;
	goto out;
	}

	len = SHA256_DIGEST_SIZE;
	out_sg = nx_build_sg_list(nx_ctx->out_sg, out, &len, max_sg_len);

	if (len != SHA256_DIGEST_SIZE) {
	rc = -EINVAL;
	goto out;
	}

	nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg);
	nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
	if (!nx_ctx->op.outlen) {
	rc = -EINVAL;
	goto out;
	}

	rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
	desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
	if (rc)
	goto out;

	atomic_inc(&(nx_ctx->stats->sha256_ops));

	atomic64_add(sctx->count, &(nx_ctx->stats->sha256_bytes));
	memcpy(out, csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE);
	out:
	spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
	return rc;
	}

	static int nx_sha256_export(struct shash_desc desc, void out)
	{
	struct sha256_state *sctx = shash_desc_ctx(desc);

	memcpy(out, sctx, sizeof(*sctx));

	return 0;
	}

	static int nx_sha256_import(struct shash_desc desc, const void in)
	{
	struct sha256_state *sctx = shash_desc_ctx(desc);

	memcpy(sctx, in, sizeof(*sctx));

	return 0;
	}

	struct shash_alg nx_shash_sha256_alg = {
	.digestsize = SHA256_DIGEST_SIZE,
	.init = nx_sha256_init,
	.update = nx_sha256_update,
	.final = nx_sha256_final,
	.export = nx_sha256_export,
	.import = nx_sha256_import,
	.descsize = sizeof(struct sha256_state),
	.statesize = sizeof(struct sha256_state),
	.base = {
	.cra_name = "sha256",
	.cra_driver_name = "sha256-nx",
	.cra_priority = 300,
	.cra_blocksize = SHA256_BLOCK_SIZE,
	.cra_module = THIS_MODULE,
	.cra_ctxsize = sizeof(struct nx_crypto_ctx),
	.cra_init = nx_crypto_ctx_sha256_init,
	.cra_exit = nx_crypto_ctx_exit,
	}
	};