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Diffstat (limited to 'arch/sparc/crypto/sha1_glue.c')
-rw-r--r--arch/sparc/crypto/sha1_glue.c183
1 files changed, 183 insertions, 0 deletions
diff --git a/arch/sparc/crypto/sha1_glue.c b/arch/sparc/crypto/sha1_glue.c
new file mode 100644
index 000000000000..2bbb20bee9f1
--- /dev/null
+++ b/arch/sparc/crypto/sha1_glue.c
@@ -0,0 +1,183 @@
+/* Glue code for SHA1 hashing optimized for sparc64 crypto opcodes.
+ *
+ * This is based largely upon arch/x86/crypto/sha1_ssse3_glue.c
+ *
+ * Copyright (c) Alan Smithee.
+ * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
+ * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
+ * Copyright (c) Mathias Krause <minipli@googlemail.com>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <crypto/internal/hash.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/cryptohash.h>
+#include <linux/types.h>
+#include <crypto/sha.h>
+
+#include <asm/pstate.h>
+#include <asm/elf.h>
+
+#include "opcodes.h"
+
+asmlinkage void sha1_sparc64_transform(u32 *digest, const char *data,
+ unsigned int rounds);
+
+static int sha1_sparc64_init(struct shash_desc *desc)
+{
+ struct sha1_state *sctx = shash_desc_ctx(desc);
+
+ *sctx = (struct sha1_state){
+ .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
+ };
+
+ return 0;
+}
+
+static void __sha1_sparc64_update(struct sha1_state *sctx, const u8 *data,
+ unsigned int len, unsigned int partial)
+{
+ unsigned int done = 0;
+
+ sctx->count += len;
+ if (partial) {
+ done = SHA1_BLOCK_SIZE - partial;
+ memcpy(sctx->buffer + partial, data, done);
+ sha1_sparc64_transform(sctx->state, sctx->buffer, 1);
+ }
+ if (len - done >= SHA1_BLOCK_SIZE) {
+ const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE;
+
+ sha1_sparc64_transform(sctx->state, data + done, rounds);
+ done += rounds * SHA1_BLOCK_SIZE;
+ }
+
+ memcpy(sctx->buffer, data + done, len - done);
+}
+
+static int sha1_sparc64_update(struct shash_desc *desc, const u8 *data,
+ unsigned int len)
+{
+ struct sha1_state *sctx = shash_desc_ctx(desc);
+ unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
+
+ /* Handle the fast case right here */
+ if (partial + len < SHA1_BLOCK_SIZE) {
+ sctx->count += len;
+ memcpy(sctx->buffer + partial, data, len);
+ } else
+ __sha1_sparc64_update(sctx, data, len, partial);
+
+ return 0;
+}
+
+/* Add padding and return the message digest. */
+static int sha1_sparc64_final(struct shash_desc *desc, u8 *out)
+{
+ struct sha1_state *sctx = shash_desc_ctx(desc);
+ unsigned int i, index, padlen;
+ __be32 *dst = (__be32 *)out;
+ __be64 bits;
+ static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, };
+
+ bits = cpu_to_be64(sctx->count << 3);
+
+ /* Pad out to 56 mod 64 and append length */
+ index = sctx->count % SHA1_BLOCK_SIZE;
+ padlen = (index < 56) ? (56 - index) : ((SHA1_BLOCK_SIZE+56) - index);
+
+ /* We need to fill a whole block for __sha1_sparc64_update() */
+ if (padlen <= 56) {
+ sctx->count += padlen;
+ memcpy(sctx->buffer + index, padding, padlen);
+ } else {
+ __sha1_sparc64_update(sctx, padding, padlen, index);
+ }
+ __sha1_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
+
+ /* Store state in digest */
+ for (i = 0; i < 5; i++)
+ dst[i] = cpu_to_be32(sctx->state[i]);
+
+ /* Wipe context */
+ memset(sctx, 0, sizeof(*sctx));
+
+ return 0;
+}
+
+static int sha1_sparc64_export(struct shash_desc *desc, void *out)
+{
+ struct sha1_state *sctx = shash_desc_ctx(desc);
+
+ memcpy(out, sctx, sizeof(*sctx));
+
+ return 0;
+}
+
+static int sha1_sparc64_import(struct shash_desc *desc, const void *in)
+{
+ struct sha1_state *sctx = shash_desc_ctx(desc);
+
+ memcpy(sctx, in, sizeof(*sctx));
+
+ return 0;
+}
+
+static struct shash_alg alg = {
+ .digestsize = SHA1_DIGEST_SIZE,
+ .init = sha1_sparc64_init,
+ .update = sha1_sparc64_update,
+ .final = sha1_sparc64_final,
+ .export = sha1_sparc64_export,
+ .import = sha1_sparc64_import,
+ .descsize = sizeof(struct sha1_state),
+ .statesize = sizeof(struct sha1_state),
+ .base = {
+ .cra_name = "sha1",
+ .cra_driver_name= "sha1-sparc64",
+ .cra_priority = SPARC_CR_OPCODE_PRIORITY,
+ .cra_flags = CRYPTO_ALG_TYPE_SHASH,
+ .cra_blocksize = SHA1_BLOCK_SIZE,
+ .cra_module = THIS_MODULE,
+ }
+};
+
+static bool __init sparc64_has_sha1_opcode(void)
+{
+ unsigned long cfr;
+
+ if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
+ return false;
+
+ __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
+ if (!(cfr & CFR_SHA1))
+ return false;
+
+ return true;
+}
+
+static int __init sha1_sparc64_mod_init(void)
+{
+ if (sparc64_has_sha1_opcode()) {
+ pr_info("Using sparc64 sha1 opcode optimized SHA-1 implementation\n");
+ return crypto_register_shash(&alg);
+ }
+ pr_info("sparc64 sha1 opcode not available.\n");
+ return -ENODEV;
+}
+
+static void __exit sha1_sparc64_mod_fini(void)
+{
+ crypto_unregister_shash(&alg);
+}
+
+module_init(sha1_sparc64_mod_init);
+module_exit(sha1_sparc64_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, sparc64 sha1 opcode accelerated");
+
+MODULE_ALIAS("sha1");