[patch 8/17] s390: sha256 support.

From: Martin Schwidefsky
Date: Fri Dec 09 2005 - 10:26:41 EST

From: Jan Glauber <jan.glauber@xxxxxxxxxx>

[patch 8/17] s390: sha256 support.

Add support for the hardware accelerated sha256 crypto algorithm.

Signed-off-by: Jan Glauber <jan.glauber@xxxxxxxxxx>
Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>

---

arch/s390/crypto/Makefile | 1
arch/s390/crypto/crypt_s390.h | 2
arch/s390/crypto/crypt_s390_query.c | 6 +
arch/s390/crypto/sha256_s390.c | 151 ++++++++++++++++++++++++++++++++++++
arch/s390/defconfig | 1
crypto/Kconfig | 11 ++
6 files changed, 171 insertions(+), 1 deletion(-)

diff -urpN linux-2.6/arch/s390/crypto/crypt_s390.h linux-2.6-patched/arch/s390/crypto/crypt_s390.h
--- linux-2.6/arch/s390/crypto/crypt_s390.h 2005-12-09 14:25:09.000000000 +0100
+++ linux-2.6-patched/arch/s390/crypto/crypt_s390.h 2005-12-09 14:25:09.000000000 +0100
@@ -61,6 +61,7 @@ enum crypt_s390_kmc_func {
enum crypt_s390_kimd_func {
KIMD_QUERY = CRYPT_S390_KIMD | 0,
KIMD_SHA_1 = CRYPT_S390_KIMD | 1,
+ KIMD_SHA_256 = CRYPT_S390_KIMD | 2,
};

/* function codes for KLMD (COMPUTE LAST MESSAGE DIGEST)
@@ -69,6 +70,7 @@ enum crypt_s390_kimd_func {
enum crypt_s390_klmd_func {
KLMD_QUERY = CRYPT_S390_KLMD | 0,
KLMD_SHA_1 = CRYPT_S390_KLMD | 1,
+ KLMD_SHA_256 = CRYPT_S390_KLMD | 2,
};

/* function codes for KMAC (COMPUTE MESSAGE AUTHENTICATION CODE)
diff -urpN linux-2.6/arch/s390/crypto/crypt_s390_query.c linux-2.6-patched/arch/s390/crypto/crypt_s390_query.c
--- linux-2.6/arch/s390/crypto/crypt_s390_query.c 2005-12-09 14:25:09.000000000 +0100
+++ linux-2.6-patched/arch/s390/crypto/crypt_s390_query.c 2005-12-09 14:25:09.000000000 +0100
@@ -48,16 +48,20 @@ static void query_available_functions(vo
crypt_s390_func_available(KIMD_QUERY));
printk(KERN_INFO "KIMD_SHA_1: %d\n",
crypt_s390_func_available(KIMD_SHA_1));
+ printk(KERN_INFO "KIMD_SHA_256: %d\n",
+ crypt_s390_func_available(KIMD_SHA_256));

/* query available KLMD functions */
printk(KERN_INFO "KLMD_QUERY: %d\n",
crypt_s390_func_available(KLMD_QUERY));
printk(KERN_INFO "KLMD_SHA_1: %d\n",
crypt_s390_func_available(KLMD_SHA_1));
+ printk(KERN_INFO "KLMD_SHA_256: %d\n",
+ crypt_s390_func_available(KLMD_SHA_256));

/* query available KMAC functions */
printk(KERN_INFO "KMAC_QUERY: %d\n",
- crypt_s3990_func_available(KMAC_QUERY));
+ crypt_s390_func_available(KMAC_QUERY));
printk(KERN_INFO "KMAC_DEA: %d\n",
crypt_s390_func_available(KMAC_DEA));
printk(KERN_INFO "KMAC_TDEA_128: %d\n",
diff -urpN linux-2.6/arch/s390/crypto/Makefile linux-2.6-patched/arch/s390/crypto/Makefile
--- linux-2.6/arch/s390/crypto/Makefile 2005-12-09 14:25:09.000000000 +0100
+++ linux-2.6-patched/arch/s390/crypto/Makefile 2005-12-09 14:25:09.000000000 +0100
@@ -3,6 +3,7 @@
#

obj-$(CONFIG_CRYPTO_SHA1_S390) += sha1_s390.o
+obj-$(CONFIG_CRYPTO_SHA256_S390) += sha256_s390.o
obj-$(CONFIG_CRYPTO_DES_S390) += des_s390.o des_check_key.o

obj-$(CONFIG_CRYPTO_TEST) += crypt_s390_query.o
diff -urpN linux-2.6/arch/s390/crypto/sha256_s390.c linux-2.6-patched/arch/s390/crypto/sha256_s390.c
--- linux-2.6/arch/s390/crypto/sha256_s390.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6-patched/arch/s390/crypto/sha256_s390.c 2005-12-09 14:25:09.000000000 +0100
@@ -0,0 +1,151 @@
+/*
+ * Cryptographic API.
+ *
+ * s390 implementation of the SHA256 Secure Hash Algorithm.
+ *
+ * s390 Version:
+ * Copyright (C) 2005 IBM Deutschland GmbH, IBM Corporation
+ * Author(s): Jan Glauber (jang@xxxxxxxxxx)
+ *
+ * Derived from "crypto/sha256.c"
+ * and "arch/s390/crypto/sha1_s390.c"
+ *
+ * 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; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/crypto.h>
+
+#include "crypt_s390.h"
+
+#define SHA256_DIGEST_SIZE 32
+#define SHA256_BLOCK_SIZE 64
+
+struct s390_sha256_ctx {
+ u64 count;
+ u32 state[8];
+ u8 buf[2 * SHA256_BLOCK_SIZE];
+};
+
+static void sha256_init(void *ctx)
+{
+ struct s390_sha256_ctx *sctx = ctx;
+
+ sctx->state[0] = 0x6a09e667;
+ sctx->state[1] = 0xbb67ae85;
+ sctx->state[2] = 0x3c6ef372;
+ sctx->state[3] = 0xa54ff53a;
+ sctx->state[4] = 0x510e527f;
+ sctx->state[5] = 0x9b05688c;
+ sctx->state[6] = 0x1f83d9ab;
+ sctx->state[7] = 0x5be0cd19;
+ sctx->count = 0;
+ memset(sctx->buf, 0, sizeof(sctx->buf));
+}
+
+static void sha256_update(void *ctx, const u8 *data, unsigned int len)
+{
+ struct s390_sha256_ctx *sctx = ctx;
+ unsigned int index;
+
+ /* how much is already in the buffer? */
+ index = sctx->count / 8 & 0x3f;
+
+ /* update message bit length */
+ sctx->count += len * 8;
+
+ /* process one block */
+ if ((index + len) >= SHA256_BLOCK_SIZE) {
+ memcpy(sctx->buf + index, data, SHA256_BLOCK_SIZE - index);
+ crypt_s390_kimd(KIMD_SHA_256, sctx->state, sctx->buf,
+ SHA256_BLOCK_SIZE);
+ data += SHA256_BLOCK_SIZE - index;
+ len -= SHA256_BLOCK_SIZE - index;
+ }
+
+ /* anything left? */
+ if (len)
+ memcpy(sctx->buf + index , data, len);
+}
+
+static void pad_message(struct s390_sha256_ctx* sctx)
+{
+ int index, end;
+
+ index = sctx->count / 8 & 0x3f;
+ end = index < 56 ? SHA256_BLOCK_SIZE : 2 * SHA256_BLOCK_SIZE;
+
+ /* start pad with 1 */
+ sctx->buf[index] = 0x80;
+
+ /* pad with zeros */
+ index++;
+ memset(sctx->buf + index, 0x00, end - index - 8);
+
+ /* append message length */
+ memcpy(sctx->buf + end - 8, &sctx->count, sizeof sctx->count);
+
+ sctx->count = end * 8;
+}
+
+/* Add padding and return the message digest */
+static void sha256_final(void* ctx, u8 *out)
+{
+ struct s390_sha256_ctx *sctx = ctx;
+
+ /* must perform manual padding */
+ pad_message(sctx);
+
+ crypt_s390_kimd(KIMD_SHA_256, sctx->state, sctx->buf,
+ sctx->count / 8);
+
+ /* copy digest to out */
+ memcpy(out, sctx->state, SHA256_DIGEST_SIZE);
+
+ /* wipe context */
+ memset(sctx, 0, sizeof *sctx);
+}
+
+static struct crypto_alg alg = {
+ .cra_name = "sha256",
+ .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
+ .cra_blocksize = SHA256_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct s390_sha256_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_list = LIST_HEAD_INIT(alg.cra_list),
+ .cra_u = { .digest = {
+ .dia_digestsize = SHA256_DIGEST_SIZE,
+ .dia_init = sha256_init,
+ .dia_update = sha256_update,
+ .dia_final = sha256_final } }
+};
+
+static int init(void)
+{
+ int ret;
+
+ if (!crypt_s390_func_available(KIMD_SHA_256))
+ return -ENOSYS;
+
+ ret = crypto_register_alg(&alg);
+ if (ret != 0)
+ printk(KERN_INFO "crypt_s390: sha256_s390 couldn't be loaded.");
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ crypto_unregister_alg(&alg);
+}
+
+module_init(init);
+module_exit(fini);
+
+MODULE_ALIAS("sha256");
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");
diff -urpN linux-2.6/arch/s390/defconfig linux-2.6-patched/arch/s390/defconfig
--- linux-2.6/arch/s390/defconfig 2005-12-09 14:25:09.000000000 +0100
+++ linux-2.6-patched/arch/s390/defconfig 2005-12-09 14:25:18.000000000 +0100
@@ -634,6 +634,7 @@ CONFIG_CRYPTO=y
# CONFIG_CRYPTO_SHA1 is not set
# CONFIG_CRYPTO_SHA1_S390 is not set
# CONFIG_CRYPTO_SHA256 is not set
+# CONFIG_CRYPTO_SHA256_S390 is not set
# CONFIG_CRYPTO_SHA512 is not set
# CONFIG_CRYPTO_WP512 is not set
# CONFIG_CRYPTO_TGR192 is not set
diff -urpN linux-2.6/crypto/Kconfig linux-2.6-patched/crypto/Kconfig
--- linux-2.6/crypto/Kconfig 2005-12-09 14:25:09.000000000 +0100
+++ linux-2.6-patched/crypto/Kconfig 2005-12-09 14:25:09.000000000 +0100
@@ -44,6 +44,7 @@ config CRYPTO_SHA1_S390
tristate "SHA1 digest algorithm (s390)"
depends on CRYPTO && ARCH_S390
help
+ This is the s390 hardware accelerated implementation of the
SHA-1 secure hash standard (FIPS 180-1/DFIPS 180-2).

config CRYPTO_SHA256
@@ -55,6 +56,16 @@ config CRYPTO_SHA256
This version of SHA implements a 256 bit hash with 128 bits of
security against collision attacks.

+config CRYPTO_SHA256_S390
+ tristate "SHA256 digest algorithm (s390)"
+ depends on CRYPTO && ARCH_S390
+ help
+ This is the s390 hardware accelerated implementation of the
+ SHA256 secure hash standard (DFIPS 180-2).
+
+ This version of SHA implements a 256 bit hash with 128 bits of
+ security against collision attacks.
+
config CRYPTO_SHA512
tristate "SHA384 and SHA512 digest algorithms"
depends on CRYPTO
-
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