[CRYPTO] sha512: Hardware acceleration for s390

Exploit the System z10 hardware acceleration for SHA512.

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

6 files changed, 97 insertions, 4 deletions

diff --git a/arch/s390/crypto/Makefile b/arch/s390/crypto/Makefile
index 5f1a5f89cc9e..6a1157fa4f98 100644
--- a/arch/s390/crypto/Makefile
+++ b/arch/s390/crypto/Makefile
@@ -4,6 +4,7 @@
 
 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_DES_S390) += des_s390.o des_check_key.o
 obj-$(CONFIG_CRYPTO_AES_S390) += aes_s390.o
 obj-$(CONFIG_S390_PRNG) += prng.o
diff --git a/arch/s390/crypto/crypt_s390.h b/arch/s390/crypto/crypt_s390.h
index 95f5160df27f..9992f95ef992 100644
--- a/arch/s390/crypto/crypt_s390.h
+++ b/arch/s390/crypto/crypt_s390.h
@@ -82,6 +82,7 @@ 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,
+        KIMD_SHA_512 = CRYPT_S390_KIMD | 3,
 };
 
 /*
@@ -92,6 +93,7 @@ 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,
+        KLMD_SHA_512 = CRYPT_S390_KLMD | 3,
 };
 
 /*
diff --git a/arch/s390/crypto/sha.h b/arch/s390/crypto/sha.h
index b7a52ab5db97..1ceafa571eab 100644
--- a/arch/s390/crypto/sha.h
+++ b/arch/s390/crypto/sha.h
@@ -19,11 +19,12 @@
 #include <crypto/sha.h>
 
 /* must be big enough for the largest SHA variant */
-#define SHA_MAX_BLOCK_SIZE      SHA256_BLOCK_SIZE
+#define SHA_MAX_STATE_SIZE      16
+#define SHA_MAX_BLOCK_SIZE      SHA512_BLOCK_SIZE
 
 struct s390_sha_ctx {
         u64 count;              /* message length in bytes */
-        u32 state[8];
+        u32 state[SHA_MAX_STATE_SIZE];
         u8 buf[2 * SHA_MAX_BLOCK_SIZE];
         int func;               /* KIMD function to use */
 };
diff --git a/arch/s390/crypto/sha512_s390.c b/arch/s390/crypto/sha512_s390.c
new file mode 100644
index 000000000000..4d651bbce0f4
--- /dev/null
+++ b/arch/s390/crypto/sha512_s390.c
@@ -0,0 +1,71 @@
+/*
+ * Cryptographic API.
+ *
+ * s390 implementation of the SHA512 Secure Hash Algorithm.
+ *
+ * Copyright IBM Corp. 2007
+ * Author(s): Jan Glauber (jang@de.ibm.com)
+ *
+ * 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 "sha.h"
+#include "crypt_s390.h"
+
+static void sha512_init(struct crypto_tfm *tfm)
+{
+        struct s390_sha_ctx *ctx = crypto_tfm_ctx(tfm);
+
+        *(__u64 *)&ctx->state[0] = 0x6a09e667f3bcc908ULL;
+        *(__u64 *)&ctx->state[2] = 0xbb67ae8584caa73bULL;
+        *(__u64 *)&ctx->state[4] = 0x3c6ef372fe94f82bULL;
+        *(__u64 *)&ctx->state[6] = 0xa54ff53a5f1d36f1ULL;
+        *(__u64 *)&ctx->state[8] = 0x510e527fade682d1ULL;
+        *(__u64 *)&ctx->state[10] = 0x9b05688c2b3e6c1fULL;
+        *(__u64 *)&ctx->state[12] = 0x1f83d9abfb41bd6bULL;
+        *(__u64 *)&ctx->state[14] = 0x5be0cd19137e2179ULL;
+        ctx->count = 0;
+        ctx->func = KIMD_SHA_512;
+}
+
+static struct crypto_alg alg = {
+        .cra_name       =       "sha512",
+        .cra_driver_name =      "sha512-s390",
+        .cra_priority   =       CRYPT_S390_PRIORITY,
+        .cra_flags      =       CRYPTO_ALG_TYPE_DIGEST,
+        .cra_blocksize  =       SHA512_BLOCK_SIZE,
+        .cra_ctxsize    =       sizeof(struct s390_sha_ctx),
+        .cra_module     =       THIS_MODULE,
+        .cra_list       =       LIST_HEAD_INIT(alg.cra_list),
+        .cra_u          =       { .digest = {
+        .dia_digestsize =       SHA512_DIGEST_SIZE,
+        .dia_init       =       sha512_init,
+        .dia_update     =       s390_sha_update,
+        .dia_final      =       s390_sha_final } }
+};
+
+static int __init init(void)
+{
+        if (!crypt_s390_func_available(KIMD_SHA_512))
+                return -EOPNOTSUPP;
+        return crypto_register_alg(&alg);
+}
+
+static void __exit fini(void)
+{
+        crypto_unregister_alg(&alg);
+}
+
+module_init(init);
+module_exit(fini);
+
+MODULE_ALIAS("sha512");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SHA512 Secure Hash Algorithm");
diff --git a/arch/s390/crypto/sha_common.c b/arch/s390/crypto/sha_common.c
index 80b6f2ba005e..9d6eb8c3d37e 100644
--- a/arch/s390/crypto/sha_common.c
+++ b/arch/s390/crypto/sha_common.c
@@ -59,12 +59,15 @@ void s390_sha_final(struct crypto_tfm *tfm, u8 *out)
         struct s390_sha_ctx *ctx = crypto_tfm_ctx(tfm);
         unsigned int bsize = crypto_tfm_alg_blocksize(tfm);
         u64 bits;
-        unsigned int index, end;
+        unsigned int index, end, plen;
         int ret;
 
+        /* SHA-512 uses 128 bit padding length */
+        plen = (bsize > SHA256_BLOCK_SIZE) ? 16 : 8;
+
         /* must perform manual padding */
         index = ctx->count & (bsize - 1);
-        end = (index < bsize - 8) ? bsize : (2 * bsize);
+        end = (index < bsize - plen) ? bsize : (2 * bsize);
 
         /* start pad with 1 */
         ctx->buf[index] = 0x80;
@@ -73,6 +76,10 @@ void s390_sha_final(struct crypto_tfm *tfm, u8 *out)
         /* pad with zeros */
         memset(ctx->buf + index, 0x00, end - index - 8);
 
+        /*
+         * Append message length. Well, SHA-512 wants a 128 bit lenght value,
+         * nevertheless we use u64, should be enough for now...
+         */
         bits = ctx->count * 8;
         memcpy(ctx->buf + end - 8, &bits, sizeof(bits));
 
diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index 6d2f0c8d419a..ea7b19047270 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -101,6 +101,17 @@ config CRYPTO_SHA256_S390
           This version of SHA implements a 256 bit hash with 128 bits of
           security against collision attacks.
 
+config CRYPTO_SHA512_S390
+        tristate "SHA512 digest algorithm"
+        depends on S390
+        select CRYPTO_ALGAPI
+        help
+          This is the s390 hardware accelerated implementation of the
+          SHA512 secure hash standard.
+
+          This version of SHA implements a 512 bit hash with 256 bits of
+          security against collision attacks.
+
 config CRYPTO_DES_S390
         tristate "DES and Triple DES cipher algorithms"
         depends on S390