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    Subject[PATCH v3 13/17] powerpc: crypto: SHA256 hash routines for nx encryption
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    Date
    These routines add support for SHA-256 hashing on the Power7+ CPU's
    in-Nest accelerator driver.

    Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>
    ---
    drivers/crypto/nx/nx-sha256.c | 244 +++++++++++++++++++++++++++++++++++++++++
    1 files changed, 244 insertions(+), 0 deletions(-)
    create mode 100644 drivers/crypto/nx/nx-sha256.c

    diff --git a/drivers/crypto/nx/nx-sha256.c b/drivers/crypto/nx/nx-sha256.c
    new file mode 100644
    index 0000000..239cc3b
    --- /dev/null
    +++ b/drivers/crypto/nx/nx-sha256.c
    @@ -0,0 +1,244 @@
    +/**
    + * 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 "nx_csbcpb.h"
    +#include "nx.h"
    +
    +
    +static int nx_sha256_init(struct shash_desc *desc)
    +{
    + struct sha256_state *sctx = shash_desc_ctx(desc);
    + struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
    + struct nx_sg *out_sg;
    +
    + nx_ctx_init(nx_ctx, HCOP_FC_SHA);
    +
    + memset(sctx, 0, sizeof *sctx);
    +
    + nx_ctx->ap = &nx_ctx->props[NX_PROPS_SHA256];
    +
    + NX_CPB_SET_DIGEST_SIZE(nx_ctx->csbcpb, NX_DS_SHA256);
    + out_sg = nx_build_sg_list(nx_ctx->out_sg, (u8 *)sctx->state,
    + SHA256_DIGEST_SIZE, nx_ctx->ap->sglen);
    + nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
    +
    + 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 *in_sg;
    + u64 to_process, leftover;
    + int rc = 0;
    +
    + if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) {
    + /* 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);
    + }
    +
    + /* 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
    + */
    + if (len + sctx->count <= SHA256_BLOCK_SIZE) {
    + memcpy(sctx->buf + sctx->count, data, len);
    + sctx->count += len;
    + goto out;
    + }
    +
    + /* to_process: the SHA256_BLOCK_SIZE data chunk to process in this
    + * update */
    + to_process = (sctx->count + len) & ~(SHA256_BLOCK_SIZE - 1);
    + leftover = (sctx->count + len) & (SHA256_BLOCK_SIZE - 1);
    +
    + if (sctx->count) {
    + in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *)sctx->buf,
    + sctx->count, nx_ctx->ap->sglen);
    + in_sg = nx_build_sg_list(in_sg, (u8 *)data,
    + to_process - sctx->count,
    + nx_ctx->ap->sglen);
    + nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) *
    + sizeof(struct nx_sg);
    + } else {
    + in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *)data,
    + to_process, nx_ctx->ap->sglen);
    + nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) *
    + sizeof(struct nx_sg);
    + }
    +
    + NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
    +
    + if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
    + rc = -EINVAL;
    + goto out;
    + }
    +
    + rc = nx_hcall_sync(nx_ctx, &nx_ctx->op);
    + if (rc)
    + goto out;
    +
    + atomic_inc(&(nx_ctx->stats->sha256_ops));
    +
    + /* copy the leftover back into the state struct */
    + memcpy(sctx->buf, data + len - leftover, leftover);
    + sctx->count = leftover;
    +
    + csbcpb->cpb.sha256.message_bit_length += (u64)
    + (csbcpb->cpb.sha256.spbc * 8);
    +
    + /* everything after the first update is continuation */
    + NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
    +out:
    + 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;
    + int rc;
    +
    + if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) {
    + /* we've hit the nx chip previously, now we're finalizing,
    + * so copy over the partial digest */
    + memcpy(csbcpb->cpb.sha256.input_partial_digest,
    + csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE);
    + }
    +
    + /* final is represented by continuing the operation and indicating that
    + * this is not an intermediate operation */
    + NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
    +
    + csbcpb->cpb.sha256.message_bit_length += (u64)(sctx->count * 8);
    +
    + in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *)sctx->buf,
    + sctx->count, nx_ctx->ap->sglen);
    + out_sg = nx_build_sg_list(nx_ctx->out_sg, out, SHA256_DIGEST_SIZE,
    + nx_ctx->ap->sglen);
    + 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);
    + if (rc)
    + goto out;
    +
    + atomic_inc(&(nx_ctx->stats->sha256_ops));
    +
    + atomic64_add(csbcpb->cpb.sha256.message_bit_length,
    + &(nx_ctx->stats->sha256_bytes));
    + memcpy(out, csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE);
    +out:
    + return rc;
    +}
    +
    +static int nx_sha256_export(struct shash_desc *desc, void *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 sha256_state *octx = out;
    +
    + octx->count = sctx->count +
    + (csbcpb->cpb.sha256.message_bit_length / 8);
    + memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
    +
    + /* if no data has been processed yet, we need to export SHA256's
    + * initial data, in case this context gets imported into a software
    + * context */
    + if (csbcpb->cpb.sha256.message_bit_length)
    + memcpy(octx->state, csbcpb->cpb.sha256.message_digest,
    + SHA256_DIGEST_SIZE);
    + else {
    + octx->state[0] = SHA256_H0;
    + octx->state[1] = SHA256_H1;
    + octx->state[2] = SHA256_H2;
    + octx->state[3] = SHA256_H3;
    + octx->state[4] = SHA256_H4;
    + octx->state[5] = SHA256_H5;
    + octx->state[6] = SHA256_H6;
    + octx->state[7] = SHA256_H7;
    + }
    +
    + return 0;
    +}
    +
    +static int nx_sha256_import(struct shash_desc *desc, const void *in)
    +{
    + 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;
    + const struct sha256_state *ictx = in;
    +
    + memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
    +
    + sctx->count = ictx->count & 0x3f;
    + csbcpb->cpb.sha256.message_bit_length = (ictx->count & ~0x3f) * 8;
    +
    + if (csbcpb->cpb.sha256.message_bit_length) {
    + memcpy(csbcpb->cpb.sha256.message_digest, ictx->state,
    + SHA256_DIGEST_SIZE);
    +
    + NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
    + NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
    + }
    +
    + 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_flags = CRYPTO_ALG_TYPE_SHASH,
    + .cra_blocksize = SHA256_BLOCK_SIZE,
    + .cra_module = THIS_MODULE,
    + .cra_ctxsize = sizeof(struct nx_crypto_ctx),
    + .cra_init = nx_crypto_ctx_sha_init,
    + .cra_exit = nx_crypto_ctx_exit,
    + }
    +};
    --
    1.7.1



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