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Subject[PATCH v2 13/17] powerpc: crypto: SHA512 hash routines for nx encryption
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Date
These routines add support for SHA-512 hashing on the Power7+ CPU's
in-Nest accelerator driver.

Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>
---
drivers/crypto/nx/nx-sha512.c | 263 +++++++++++++++++++++++++++++++++++++++++
1 files changed, 263 insertions(+), 0 deletions(-)
create mode 100644 drivers/crypto/nx/nx-sha512.c
diff --git a/drivers/crypto/nx/nx-sha512.c b/drivers/crypto/nx/nx-sha512.c
new file mode 100644
index 0000000..2de839a
--- /dev/null
+++ b/drivers/crypto/nx/nx-sha512.c
@@ -0,0 +1,263 @@
+/**
+ * SHA-512 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_sha512_init(struct shash_desc *desc)
+{
+ struct sha512_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_SHA512];
+
+ NX_CPB_SET_DIGEST_SIZE(nx_ctx->csbcpb, NX_DS_SHA512);
+ out_sg = nx_build_sg_list(nx_ctx->out_sg, (u8 *)sctx->state,
+ SHA512_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_sha512_update(struct shash_desc *desc, const u8 *data,
+ unsigned int len)
+{
+ struct sha512_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, spbc_bits;
+ 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.sha512.input_partial_digest,
+ csbcpb->cpb.sha512.message_digest, SHA512_DIGEST_SIZE);
+ }
+
+ /* 2 cases for total data len:
+ * 1: <= SHA512_BLOCK_SIZE: copy into state, return 0
+ * 2: > SHA512_BLOCK_SIZE: process X blocks, copy in leftover
+ */
+ if ((u64)len + sctx->count[0] <= SHA512_BLOCK_SIZE) {
+ memcpy(sctx->buf + sctx->count[0], data, len);
+ sctx->count[0] += len;
+ goto out;
+ }
+
+ /* to_process: the SHA512_BLOCK_SIZE data chunk to process in this
+ * update */
+ to_process = (sctx->count[0] + len) & ~(SHA512_BLOCK_SIZE - 1);
+ leftover = (sctx->count[0] + len) & (SHA512_BLOCK_SIZE - 1);
+
+ if (sctx->count[0]) {
+ in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *)sctx->buf,
+ sctx->count[0], nx_ctx->ap->sglen);
+ in_sg = nx_build_sg_list(in_sg, (u8 *)data,
+ to_process - sctx->count[0],
+ 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->sha512_ops));
+
+ /* copy the leftover back into the state struct */
+ memcpy(sctx->buf, data + len - leftover, leftover);
+ sctx->count[0] = leftover;
+
+ spbc_bits = csbcpb->cpb.sha512.spbc * 8;
+ csbcpb->cpb.sha512.message_bit_length_lo += spbc_bits;
+ if (csbcpb->cpb.sha512.message_bit_length_lo < spbc_bits)
+ csbcpb->cpb.sha512.message_bit_length_hi++;
+
+ /* everything after the first update is continuation */
+ NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
+out:
+ return rc;
+}
+
+static int nx_sha512_final(struct shash_desc *desc, u8 *out)
+{
+ struct sha512_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;
+ u64 count0;
+ 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.sha512.input_partial_digest,
+ csbcpb->cpb.sha512.message_digest, SHA512_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;
+
+ count0 = sctx->count[0] * 8;
+
+ csbcpb->cpb.sha512.message_bit_length_lo += count0;
+ if (csbcpb->cpb.sha512.message_bit_length_lo < count0)
+ csbcpb->cpb.sha512.message_bit_length_hi++;
+
+ in_sg = nx_build_sg_list(nx_ctx->in_sg, sctx->buf, sctx->count[0],
+ nx_ctx->ap->sglen);
+ out_sg = nx_build_sg_list(nx_ctx->out_sg, out, SHA512_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->sha512_ops));
+ atomic64_add(csbcpb->cpb.sha512.message_bit_length_lo,
+ &(nx_ctx->stats->sha512_bytes));
+
+ memcpy(out, csbcpb->cpb.sha512.message_digest, SHA512_DIGEST_SIZE);
+out:
+ return rc;
+}
+
+static int nx_sha512_export(struct shash_desc *desc, void *out)
+{
+ struct sha512_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 sha512_state *octx = out;
+
+ /* move message_bit_length (128 bits) into count and convert its value
+ * to bytes */
+ octx->count[0] = csbcpb->cpb.sha512.message_bit_length_lo >> 3 |
+ ((csbcpb->cpb.sha512.message_bit_length_hi & 7) << 61);
+ octx->count[1] = csbcpb->cpb.sha512.message_bit_length_hi >> 3;
+
+ octx->count[0] += sctx->count[0];
+ if (octx->count[0] < sctx->count[0])
+ octx->count[1]++;
+
+ memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
+
+ /* if no data has been processed yet, we need to export SHA512's
+ * initial data, in case this context gets imported into a software
+ * context */
+ if (csbcpb->cpb.sha512.message_bit_length_hi ||
+ csbcpb->cpb.sha512.message_bit_length_lo)
+ memcpy(octx->state, csbcpb->cpb.sha512.message_digest,
+ SHA512_DIGEST_SIZE);
+ else {
+ octx->state[0] = SHA512_H0;
+ octx->state[1] = SHA512_H1;
+ octx->state[2] = SHA512_H2;
+ octx->state[3] = SHA512_H3;
+ octx->state[4] = SHA512_H4;
+ octx->state[5] = SHA512_H5;
+ octx->state[6] = SHA512_H6;
+ octx->state[7] = SHA512_H7;
+ }
+
+ return 0;
+}
+
+static int nx_sha512_import(struct shash_desc *desc, const void *in)
+{
+ struct sha512_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 sha512_state *ictx = in;
+
+ memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
+ sctx->count[0] = ictx->count[0] & 0x3f;
+ csbcpb->cpb.sha512.message_bit_length_lo = (ictx->count[0] & ~0x3f)
+ << 3;
+ csbcpb->cpb.sha512.message_bit_length_hi = ictx->count[1] << 3 |
+ ictx->count[0] >> 61;
+
+ if (csbcpb->cpb.sha512.message_bit_length_hi ||
+ csbcpb->cpb.sha512.message_bit_length_lo) {
+ memcpy(csbcpb->cpb.sha512.message_digest, ictx->state,
+ SHA512_DIGEST_SIZE);
+
+ NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
+ NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
+ }
+
+ return 0;
+}
+
+struct shash_alg nx_shash_sha512_alg = {
+ .digestsize = SHA512_DIGEST_SIZE,
+ .init = nx_sha512_init,
+ .update = nx_sha512_update,
+ .final = nx_sha512_final,
+ .export = nx_sha512_export,
+ .import = nx_sha512_import,
+ .descsize = sizeof(struct sha512_state),
+ .statesize = sizeof(struct sha512_state),
+ .base = {
+ .cra_name = "sha512",
+ .cra_driver_name = "sha512-nx",
+ .cra_priority = 300,
+ .cra_flags = CRYPTO_ALG_TYPE_SHASH,
+ .cra_blocksize = SHA512_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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