1 files changed, 265 insertions, 0 deletions
diff --git a/drivers/crypto/nx/nx-sha512.c b/drivers/crypto/nx/nx-sha512.c
new file mode 100644
index 000000000..f74776b7d
--- /dev/null
+++ b/drivers/crypto/nx/nx-sha512.c
@@ -0,0 +1,265 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * SHA-512 routines supporting the Power 7+ Nest Accelerators driver
+ *
+ * Copyright (C) 2011-2012 International Business Machines Inc.
+ *
+ * Author: Kent Yoder <yoder1@us.ibm.com>
+ */
+
+#include <crypto/internal/hash.h>
+#include <crypto/sha2.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/unaligned.h>
+
+#include "nx_csbcpb.h"
+#include "nx.h"
+
+struct sha512_state_be {
+	__be64 state[SHA512_DIGEST_SIZE / 8];
+	u64 count[2];
+};
+
+static int nx_crypto_ctx_sha512_init(struct crypto_shash *tfm)
+{
+	struct nx_crypto_ctx *nx_ctx = crypto_shash_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_SHA512];
+
+	NX_CPB_SET_DIGEST_SIZE(nx_ctx->csbcpb, NX_DS_SHA512);
+
+	return 0;
+}
+
+static int nx_sha512_init(struct shash_desc *desc)
+{
+	struct sha512_state_be *sctx = shash_desc_ctx(desc);
+
+	sctx->state[0] = __cpu_to_be64(SHA512_H0);
+	sctx->state[1] = __cpu_to_be64(SHA512_H1);
+	sctx->state[2] = __cpu_to_be64(SHA512_H2);
+	sctx->state[3] = __cpu_to_be64(SHA512_H3);
+	sctx->state[4] = __cpu_to_be64(SHA512_H4);
+	sctx->state[5] = __cpu_to_be64(SHA512_H5);
+	sctx->state[6] = __cpu_to_be64(SHA512_H6);
+	sctx->state[7] = __cpu_to_be64(SHA512_H7);
+	sctx->count[0] = 0;
+	sctx->count[1] = 0;
+
+	return 0;
+}
+
+static int nx_sha512_update(struct shash_desc *desc, const u8 *data,
+			    unsigned int len)
+{
+	struct nx_crypto_ctx *nx_ctx = crypto_shash_ctx(desc->tfm);
+	struct sha512_state_be *sctx = shash_desc_ctx(desc);
+	struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
+	u64 to_process, leftover, total = len;
+	struct nx_sg *out_sg;
+	unsigned long irq_flags;
+	int rc = 0;
+	int data_len;
+	u32 max_sg_len;
+
+	spin_lock_irqsave(&nx_ctx->lock, irq_flags);
+
+	memcpy(csbcpb->cpb.sha512.message_digest, sctx->state, SHA512_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 = SHA512_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 != SHA512_DIGEST_SIZE) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	do {
+		struct nx_sg *in_sg = nx_ctx->in_sg;
+
+		to_process = total & ~(SHA512_BLOCK_SIZE - 1);
+
+		data_len = to_process;
+		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;
+		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.sha512.input_partial_digest,
+			       csbcpb->cpb.sha512.message_digest,
+			       SHA512_DIGEST_SIZE);
+
+		if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
+			rc = -EINVAL;
+			goto out;
+		}
+
+		rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, 0);
+		if (rc)
+			goto out;
+
+		atomic_inc(&(nx_ctx->stats->sha512_ops));
+
+		total -= to_process;
+		data += to_process;
+		sctx->count[0] += to_process;
+		if (sctx->count[0] < to_process)
+			sctx->count[1]++;
+	} while (leftover >= SHA512_BLOCK_SIZE);
+
+	rc = leftover;
+	memcpy(sctx->state, csbcpb->cpb.sha512.message_digest, SHA512_DIGEST_SIZE);
+out:
+	spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
+	return rc;
+}
+
+static int nx_sha512_finup(struct shash_desc *desc, const u8 *src,
+			   unsigned int nbytes, u8 *out)
+{
+	struct sha512_state_be *sctx = shash_desc_ctx(desc);
+	struct nx_crypto_ctx *nx_ctx = crypto_shash_ctx(desc->tfm);
+	struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
+	struct nx_sg *in_sg, *out_sg;
+	u32 max_sg_len;
+	unsigned long irq_flags;
+	u64 count0, count1;
+	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
+	 * copy over the partial digest */
+	memcpy(csbcpb->cpb.sha512.input_partial_digest, sctx->state, SHA512_DIGEST_SIZE);
+	NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
+	NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
+
+	count0 = sctx->count[0] + nbytes;
+	count1 = sctx->count[1];
+
+	csbcpb->cpb.sha512.message_bit_length_lo = count0 << 3;
+	csbcpb->cpb.sha512.message_bit_length_hi = (count1 << 3) |
+						   (count0 >> 61);
+
+	len = nbytes;
+	in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *)src, &len, max_sg_len);
+
+	if (len != nbytes) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	len = SHA512_DIGEST_SIZE;
+	out_sg = nx_build_sg_list(nx_ctx->out_sg, out, &len,
+				 max_sg_len);
+
+	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, 0);
+	if (rc)
+		goto out;
+
+	atomic_inc(&(nx_ctx->stats->sha512_ops));
+	atomic64_add(count0, &(nx_ctx->stats->sha512_bytes));
+
+	memcpy(out, csbcpb->cpb.sha512.message_digest, SHA512_DIGEST_SIZE);
+out:
+	spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
+	return rc;
+}
+
+static int nx_sha512_export(struct shash_desc *desc, void *out)
+{
+	struct sha512_state_be *sctx = shash_desc_ctx(desc);
+	union {
+		u8 *u8;
+		u64 *u64;
+	} p = { .u8 = out };
+	int i;
+
+	for (i = 0; i < SHA512_DIGEST_SIZE / sizeof(*p.u64); i++)
+		put_unaligned(be64_to_cpu(sctx->state[i]), p.u64++);
+
+	put_unaligned(sctx->count[0], p.u64++);
+	put_unaligned(sctx->count[1], p.u64++);
+	return 0;
+}
+
+static int nx_sha512_import(struct shash_desc *desc, const void *in)
+{
+	struct sha512_state_be *sctx = shash_desc_ctx(desc);
+	union {
+		const u8 *u8;
+		const u64 *u64;
+	} p = { .u8 = in };
+	int i;
+
+	for (i = 0; i < SHA512_DIGEST_SIZE / sizeof(*p.u64); i++)
+		sctx->state[i] = cpu_to_be64(get_unaligned(p.u64++));
+
+	sctx->count[0] = get_unaligned(p.u64++);
+	sctx->count[1] = get_unaligned(p.u64++);
+	return 0;
+}
+
+struct shash_alg nx_shash_sha512_alg = {
+	.digestsize = SHA512_DIGEST_SIZE,
+	.init       = nx_sha512_init,
+	.update     = nx_sha512_update,
+	.finup      = nx_sha512_finup,
+	.export     = nx_sha512_export,
+	.import     = nx_sha512_import,
+	.init_tfm   = nx_crypto_ctx_sha512_init,
+	.exit_tfm   = nx_crypto_ctx_shash_exit,
+	.descsize   = sizeof(struct sha512_state_be),
+	.statesize  = sizeof(struct sha512_state_be),
+	.base       = {
+		.cra_name        = "sha512",
+		.cra_driver_name = "sha512-nx",
+		.cra_priority    = 300,
+		.cra_flags	 = CRYPTO_AHASH_ALG_BLOCK_ONLY,
+		.cra_blocksize   = SHA512_BLOCK_SIZE,
+		.cra_module      = THIS_MODULE,
+		.cra_ctxsize     = sizeof(struct nx_crypto_ctx),
+	}
+};