s390/crypto: Support for SHA3 via CPACF (MSA6)

This patch introduces sha3 support for s390.

- Rework the s390-specific SHA1 and SHA2 related code to
  provide the basis for SHA3.
- Provide two new kernel modules sha3_256_s390 and
  sha3_512_s390 together with new kernel options.

Signed-off-by: Joerg Schmidbauer <jschmidb@de.ibm.com>
Reviewed-by: Ingo Franzki <ifranzki@linux.ibm.com>
Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

5 files changed, 363 insertions, 28 deletions

diff --git a/arch/s390/crypto/Makefile b/arch/s390/crypto/Makefile
index a51010ea62fa..12889d4652cc 100644
--- a/arch/s390/crypto/Makefile
+++ b/arch/s390/crypto/Makefile
@@ -6,6 +6,8 @@
 obj-$(CONFIG_CRYPTO_SHA1_S390) += sha1_s390.o sha_common.o
 obj-$(CONFIG_CRYPTO_SHA256_S390) += sha256_s390.o sha_common.o
 obj-$(CONFIG_CRYPTO_SHA512_S390) += sha512_s390.o sha_common.o
+obj-$(CONFIG_CRYPTO_SHA3_256_S390) += sha3_256_s390.o sha_common.o
+obj-$(CONFIG_CRYPTO_SHA3_512_S390) += sha3_512_s390.o sha_common.o
 obj-$(CONFIG_CRYPTO_DES_S390) += des_s390.o
 obj-$(CONFIG_CRYPTO_AES_S390) += aes_s390.o
 obj-$(CONFIG_CRYPTO_PAES_S390) += paes_s390.o
diff --git a/arch/s390/crypto/sha.h b/arch/s390/crypto/sha.h
index d6f8258b44df..ada2f98c27b7 100644
--- a/arch/s390/crypto/sha.h
+++ b/arch/s390/crypto/sha.h
@@ -12,15 +12,17 @@
 
 #include <linux/crypto.h>
 #include <crypto/sha.h>
+#include <crypto/sha3.h>
 
 /* must be big enough for the largest SHA variant */
-#define SHA_MAX_STATE_SIZE	(SHA512_DIGEST_SIZE / 4)
-#define SHA_MAX_BLOCK_SIZE      SHA512_BLOCK_SIZE
+#define SHA3_STATE_SIZE			200
+#define CPACF_MAX_PARMBLOCK_SIZE	SHA3_STATE_SIZE
+#define SHA_MAX_BLOCK_SIZE		SHA3_224_BLOCK_SIZE
 
 struct s390_sha_ctx {
-	u64 count;              /* message length in bytes */
-	u32 state[SHA_MAX_STATE_SIZE];
-	u8 buf[2 * SHA_MAX_BLOCK_SIZE];
+	u64 count;		/* message length in bytes */
+	u32 state[CPACF_MAX_PARMBLOCK_SIZE / sizeof(u32)];
+	u8 buf[SHA_MAX_BLOCK_SIZE];
 	int func;		/* KIMD function to use */
 };
 
diff --git a/arch/s390/crypto/sha3_256_s390.c b/arch/s390/crypto/sha3_256_s390.c
new file mode 100644
index 000000000000..460cbbbaa44a
--- /dev/null
+++ b/arch/s390/crypto/sha3_256_s390.c
@@ -0,0 +1,147 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Cryptographic API.
+ *
+ * s390 implementation of the SHA256 and SHA224 Secure Hash Algorithm.
+ *
+ * s390 Version:
+ *   Copyright IBM Corp. 2019
+ *   Author(s): Joerg Schmidbauer (jschmidb@de.ibm.com)
+ */
+#include <crypto/internal/hash.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/cpufeature.h>
+#include <crypto/sha.h>
+#include <crypto/sha3.h>
+#include <asm/cpacf.h>
+
+#include "sha.h"
+
+static int sha3_256_init(struct shash_desc *desc)
+{
+	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
+
+	memset(sctx->state, 0, sizeof(sctx->state));
+	sctx->count = 0;
+	sctx->func = CPACF_KIMD_SHA3_256;
+
+	return 0;
+}
+
+static int sha3_256_export(struct shash_desc *desc, void *out)
+{
+	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
+	struct sha3_state *octx = out;
+
+	octx->rsiz = sctx->count;
+	memcpy(octx->st, sctx->state, sizeof(octx->st));
+	memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
+
+	return 0;
+}
+
+static int sha3_256_import(struct shash_desc *desc, const void *in)
+{
+	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
+	const struct sha3_state *ictx = in;
+
+	sctx->count = ictx->rsiz;
+	memcpy(sctx->state, ictx->st, sizeof(ictx->st));
+	memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
+	sctx->func = CPACF_KIMD_SHA3_256;
+
+	return 0;
+}
+
+static int sha3_224_import(struct shash_desc *desc, const void *in)
+{
+	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
+	const struct sha3_state *ictx = in;
+
+	sctx->count = ictx->rsiz;
+	memcpy(sctx->state, ictx->st, sizeof(ictx->st));
+	memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
+	sctx->func = CPACF_KIMD_SHA3_224;
+
+	return 0;
+}
+
+static struct shash_alg sha3_256_alg = {
+	.digestsize	=	SHA3_256_DIGEST_SIZE,	   /* = 32 */
+	.init		=	sha3_256_init,
+	.update		=	s390_sha_update,
+	.final		=	s390_sha_final,
+	.export		=	sha3_256_export,
+	.import		=	sha3_256_import,
+	.descsize	=	sizeof(struct s390_sha_ctx),
+	.statesize	=	sizeof(struct sha3_state),
+	.base		=	{
+		.cra_name	 =	"sha3-256",
+		.cra_driver_name =	"sha3-256-s390",
+		.cra_priority	 =	300,
+		.cra_blocksize	 =	SHA3_256_BLOCK_SIZE,
+		.cra_module	 =	THIS_MODULE,
+	}
+};
+
+static int sha3_224_init(struct shash_desc *desc)
+{
+	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
+
+	memset(sctx->state, 0, sizeof(sctx->state));
+	sctx->count = 0;
+	sctx->func = CPACF_KIMD_SHA3_224;
+
+	return 0;
+}
+
+static struct shash_alg sha3_224_alg = {
+	.digestsize	=	SHA3_224_DIGEST_SIZE,
+	.init		=	sha3_224_init,
+	.update		=	s390_sha_update,
+	.final		=	s390_sha_final,
+	.export		=	sha3_256_export, /* same as for 256 */
+	.import		=	sha3_224_import, /* function code different! */
+	.descsize	=	sizeof(struct s390_sha_ctx),
+	.statesize	=	sizeof(struct sha3_state),
+	.base		=	{
+		.cra_name	 =	"sha3-224",
+		.cra_driver_name =	"sha3-224-s390",
+		.cra_priority	 =	300,
+		.cra_blocksize	 =	SHA3_224_BLOCK_SIZE,
+		.cra_module	 =	THIS_MODULE,
+	}
+};
+
+static int __init sha3_256_s390_init(void)
+{
+	int ret;
+
+	if (!cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA3_256))
+		return -ENODEV;
+
+	ret = crypto_register_shash(&sha3_256_alg);
+	if (ret < 0)
+		goto out;
+
+	ret = crypto_register_shash(&sha3_224_alg);
+	if (ret < 0)
+		crypto_unregister_shash(&sha3_256_alg);
+out:
+	return ret;
+}
+
+static void __exit sha3_256_s390_fini(void)
+{
+	crypto_unregister_shash(&sha3_224_alg);
+	crypto_unregister_shash(&sha3_256_alg);
+}
+
+module_cpu_feature_match(MSA, sha3_256_s390_init);
+module_exit(sha3_256_s390_fini);
+
+MODULE_ALIAS_CRYPTO("sha3-256");
+MODULE_ALIAS_CRYPTO("sha3-224");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SHA3-256 and SHA3-224 Secure Hash Algorithm");
diff --git a/arch/s390/crypto/sha3_512_s390.c b/arch/s390/crypto/sha3_512_s390.c
new file mode 100644
index 000000000000..72cf460a53e5
--- /dev/null
+++ b/arch/s390/crypto/sha3_512_s390.c
@@ -0,0 +1,155 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Cryptographic API.
+ *
+ * s390 implementation of the SHA512 and SHA384 Secure Hash Algorithm.
+ *
+ * Copyright IBM Corp. 2019
+ * Author(s): Joerg Schmidbauer (jschmidb@de.ibm.com)
+ */
+#include <crypto/internal/hash.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/cpufeature.h>
+#include <crypto/sha.h>
+#include <crypto/sha3.h>
+#include <asm/cpacf.h>
+
+#include "sha.h"
+
+static int sha3_512_init(struct shash_desc *desc)
+{
+	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
+
+	memset(sctx->state, 0, sizeof(sctx->state));
+	sctx->count = 0;
+	sctx->func = CPACF_KIMD_SHA3_512;
+
+	return 0;
+}
+
+static int sha3_512_export(struct shash_desc *desc, void *out)
+{
+	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
+	struct sha3_state *octx = out;
+
+	octx->rsiz = sctx->count;
+	octx->rsizw = sctx->count >> 32;
+
+	memcpy(octx->st, sctx->state, sizeof(octx->st));
+	memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
+
+	return 0;
+}
+
+static int sha3_512_import(struct shash_desc *desc, const void *in)
+{
+	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
+	const struct sha3_state *ictx = in;
+
+	if (unlikely(ictx->rsizw))
+		return -ERANGE;
+	sctx->count = ictx->rsiz;
+
+	memcpy(sctx->state, ictx->st, sizeof(ictx->st));
+	memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
+	sctx->func = CPACF_KIMD_SHA3_512;
+
+	return 0;
+}
+
+static int sha3_384_import(struct shash_desc *desc, const void *in)
+{
+	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
+	const struct sha3_state *ictx = in;
+
+	if (unlikely(ictx->rsizw))
+		return -ERANGE;
+	sctx->count = ictx->rsiz;
+
+	memcpy(sctx->state, ictx->st, sizeof(ictx->st));
+	memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
+	sctx->func = CPACF_KIMD_SHA3_384;
+
+	return 0;
+}
+
+static struct shash_alg sha3_512_alg = {
+	.digestsize	=	SHA3_512_DIGEST_SIZE,
+	.init		=	sha3_512_init,
+	.update		=	s390_sha_update,
+	.final		=	s390_sha_final,
+	.export		=	sha3_512_export,
+	.import		=	sha3_512_import,
+	.descsize	=	sizeof(struct s390_sha_ctx),
+	.statesize	=	sizeof(struct sha3_state),
+	.base		=	{
+		.cra_name	 =	"sha3-512",
+		.cra_driver_name =	"sha3-512-s390",
+		.cra_priority	 =	300,
+		.cra_blocksize	 =	SHA3_512_BLOCK_SIZE,
+		.cra_module	 =	THIS_MODULE,
+	}
+};
+
+MODULE_ALIAS_CRYPTO("sha3-512");
+
+static int sha3_384_init(struct shash_desc *desc)
+{
+	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
+
+	memset(sctx->state, 0, sizeof(sctx->state));
+	sctx->count = 0;
+	sctx->func = CPACF_KIMD_SHA3_384;
+
+	return 0;
+}
+
+static struct shash_alg sha3_384_alg = {
+	.digestsize	=	SHA3_384_DIGEST_SIZE,
+	.init		=	sha3_384_init,
+	.update		=	s390_sha_update,
+	.final		=	s390_sha_final,
+	.export		=	sha3_512_export, /* same as for 512 */
+	.import		=	sha3_384_import, /* function code different! */
+	.descsize	=	sizeof(struct s390_sha_ctx),
+	.statesize	=	sizeof(struct sha3_state),
+	.base		=	{
+		.cra_name	 =	"sha3-384",
+		.cra_driver_name =	"sha3-384-s390",
+		.cra_priority	 =	300,
+		.cra_blocksize	 =	SHA3_384_BLOCK_SIZE,
+		.cra_ctxsize	 =	sizeof(struct s390_sha_ctx),
+		.cra_module	 =	THIS_MODULE,
+	}
+};
+
+MODULE_ALIAS_CRYPTO("sha3-384");
+
+static int __init init(void)
+{
+	int ret;
+
+	if (!cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA3_512))
+		return -ENODEV;
+	ret = crypto_register_shash(&sha3_512_alg);
+	if (ret < 0)
+		goto out;
+	ret = crypto_register_shash(&sha3_384_alg);
+	if (ret < 0)
+		crypto_unregister_shash(&sha3_512_alg);
+out:
+	return ret;
+}
+
+static void __exit fini(void)
+{
+	crypto_unregister_shash(&sha3_512_alg);
+	crypto_unregister_shash(&sha3_384_alg);
+}
+
+module_cpu_feature_match(MSA, init);
+module_exit(fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SHA3-512 and SHA3-384 Secure Hash Algorithm");
diff --git a/arch/s390/crypto/sha_common.c b/arch/s390/crypto/sha_common.c
index cf0718d121bc..d39e0f079217 100644
--- a/arch/s390/crypto/sha_common.c
+++ b/arch/s390/crypto/sha_common.c
@@ -20,7 +20,7 @@ int s390_sha_update(struct shash_desc *desc, const u8 *data, unsigned int len)
 	unsigned int index, n;
 
 	/* how much is already in the buffer? */
-	index = ctx->count & (bsize - 1);
+	index = ctx->count % bsize;
 	ctx->count += len;
 
 	if ((index + len) < bsize)
@@ -37,7 +37,7 @@ int s390_sha_update(struct shash_desc *desc, const u8 *data, unsigned int len)
 
 	/* process as many blocks as possible */
 	if (len >= bsize) {
-		n = len & ~(bsize - 1);
+		n = (len / bsize) * bsize;
 		cpacf_kimd(ctx->func, ctx->state, data, n);
 		data += n;
 		len -= n;
@@ -50,34 +50,63 @@ store:
 }
 EXPORT_SYMBOL_GPL(s390_sha_update);
 
+static int s390_crypto_shash_parmsize(int func)
+{
+	switch (func) {
+	case CPACF_KLMD_SHA_1:
+		return 20;
+	case CPACF_KLMD_SHA_256:
+		return 32;
+	case CPACF_KLMD_SHA_512:
+		return 64;
+	case CPACF_KLMD_SHA3_224:
+	case CPACF_KLMD_SHA3_256:
+	case CPACF_KLMD_SHA3_384:
+	case CPACF_KLMD_SHA3_512:
+		return 200;
+	default:
+		return -EINVAL;
+	}
+}
+
 int s390_sha_final(struct shash_desc *desc, u8 *out)
 {
 	struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
 	unsigned int bsize = crypto_shash_blocksize(desc->tfm);
 	u64 bits;
-	unsigned int index, end, plen;
-
-	/* SHA-512 uses 128 bit padding length */
-	plen = (bsize > SHA256_BLOCK_SIZE) ? 16 : 8;
+	unsigned int n, mbl_offset;
 
-	/* must perform manual padding */
-	index = ctx->count & (bsize - 1);
-	end = (index < bsize - plen) ? bsize : (2 * bsize);
-
-	/* start pad with 1 */
-	ctx->buf[index] = 0x80;
-	index++;
-
-	/* pad with zeros */
-	memset(ctx->buf + index, 0x00, end - index - 8);
-
-	/*
-	 * Append message length. Well, SHA-512 wants a 128 bit length value,
-	 * nevertheless we use u64, should be enough for now...
-	 */
+	n = ctx->count % bsize;
 	bits = ctx->count * 8;
-	memcpy(ctx->buf + end - 8, &bits, sizeof(bits));
-	cpacf_kimd(ctx->func, ctx->state, ctx->buf, end);
+	mbl_offset = s390_crypto_shash_parmsize(ctx->func) / sizeof(u32);
+	if (mbl_offset < 0)
+		return -EINVAL;
+
+	/* set total msg bit length (mbl) in CPACF parmblock */
+	switch (ctx->func) {
+	case CPACF_KLMD_SHA_1:
+	case CPACF_KLMD_SHA_256:
+		memcpy(ctx->state + mbl_offset, &bits, sizeof(bits));
+		break;
+	case CPACF_KLMD_SHA_512:
+		/*
+		 * the SHA512 parmblock has a 128-bit mbl field, clear
+		 * high-order u64 field, copy bits to low-order u64 field
+		 */
+		memset(ctx->state + mbl_offset, 0x00, sizeof(bits));
+		mbl_offset += sizeof(u64) / sizeof(u32);
+		memcpy(ctx->state + mbl_offset, &bits, sizeof(bits));
+		break;
+	case CPACF_KLMD_SHA3_224:
+	case CPACF_KLMD_SHA3_256:
+	case CPACF_KLMD_SHA3_384:
+	case CPACF_KLMD_SHA3_512:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	cpacf_klmd(ctx->func, ctx->state, ctx->buf, n);
 
 	/* copy digest to out */
 	memcpy(out, ctx->state, crypto_shash_digestsize(desc->tfm));