From: Kent Yoder Subject: [PATCH 12/17] powerpc: crypto: SHA256 hash routines for nx encryption Date: Wed, 21 Mar 2012 16:40:41 -0500 Message-ID: <1332366041.3858.46.camel@key-ThinkPad-W510> References: <1332365297.3858.5.camel@key-ThinkPad-W510> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: linux-crypto@vger.kernel.org, rcj@linux.vnet.ibm.com, benh@kernel.crashing.org, linuxppc-dev@lists.ozlabs.org To: linux-kernel@vger.kernel.org Return-path: In-Reply-To: <1332365297.3858.5.camel@key-ThinkPad-W510> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-crypto.vger.kernel.org These routines add support for SHA-256 hashing on the Power7+ CPU's in-Nest accelerator driver. Signed-off-by: Kent Yoder --- arch/powerpc/crypto/nx/nx-sha256.c | 240 ++++++++++++++++++++++++++++++++++++ 1 files changed, 240 insertions(+), 0 deletions(-) create mode 100644 arch/powerpc/crypto/nx/nx-sha256.c diff --git a/arch/powerpc/crypto/nx/nx-sha256.c b/arch/powerpc/crypto/nx/nx-sha256.c new file mode 100644 index 0000000..38560d6 --- /dev/null +++ b/arch/powerpc/crypto/nx/nx-sha256.c @@ -0,0 +1,240 @@ +/** + * 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 + */ + +#include +#include +#include +#include + +#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_ctx->csbcpb->cpb.hdr.digest_size = 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; + + if (csbcpb->cpb.hdr.fdm.continuation == 1) { + /* 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; + return 0; + } + + /* 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); + } + + csbcpb->cpb.hdr.fdm.intermediate = 1; + + if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) + return -EINVAL; + + 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 */ + csbcpb->cpb.hdr.fdm.continuation = 1; +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 (csbcpb->cpb.hdr.fdm.continuation == 1) { + /* 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 */ + csbcpb->cpb.hdr.fdm.intermediate = 0; + + 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) + return -EINVAL; + + 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); + + csbcpb->cpb.hdr.fdm.continuation = 1; + csbcpb->cpb.hdr.fdm.intermediate = 1; + } + + 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