sparc64: Add MD5 driver making use of the 'md5' instruction.
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/arch/sparc/crypto/md5_glue.c b/arch/sparc/crypto/md5_glue.c
new file mode 100644
index 0000000..bdfcfef
--- /dev/null
+++ b/arch/sparc/crypto/md5_glue.c
@@ -0,0 +1,186 @@
+/* Glue code for MD5 hashing optimized for sparc64 crypto opcodes.
+ *
+ * This is based largely upon arch/x86/crypto/sha1_ssse3_glue.c
+ * and crypto/md5.c which are:
+ *
+ * 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>
+ * Copyright (c) Cryptoapi developers.
+ * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
+ */
+
+#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/md5.h>
+
+#include <asm/pstate.h>
+#include <asm/elf.h>
+
+asmlinkage void md5_sparc64_transform(u32 *digest, const char *data,
+ unsigned int rounds);
+
+static int md5_sparc64_init(struct shash_desc *desc)
+{
+ struct md5_state *mctx = shash_desc_ctx(desc);
+
+ mctx->hash[0] = cpu_to_le32(0x67452301);
+ mctx->hash[1] = cpu_to_le32(0xefcdab89);
+ mctx->hash[2] = cpu_to_le32(0x98badcfe);
+ mctx->hash[3] = cpu_to_le32(0x10325476);
+ mctx->byte_count = 0;
+
+ return 0;
+}
+
+static void __md5_sparc64_update(struct md5_state *sctx, const u8 *data,
+ unsigned int len, unsigned int partial)
+{
+ unsigned int done = 0;
+
+ sctx->byte_count += len;
+ if (partial) {
+ done = MD5_HMAC_BLOCK_SIZE - partial;
+ memcpy((u8 *)sctx->block + partial, data, done);
+ md5_sparc64_transform(sctx->hash, (u8 *)sctx->block, 1);
+ }
+ if (len - done >= MD5_HMAC_BLOCK_SIZE) {
+ const unsigned int rounds = (len - done) / MD5_HMAC_BLOCK_SIZE;
+
+ md5_sparc64_transform(sctx->hash, data + done, rounds);
+ done += rounds * MD5_HMAC_BLOCK_SIZE;
+ }
+
+ memcpy(sctx->block, data + done, len - done);
+}
+
+static int md5_sparc64_update(struct shash_desc *desc, const u8 *data,
+ unsigned int len)
+{
+ struct md5_state *sctx = shash_desc_ctx(desc);
+ unsigned int partial = sctx->byte_count % MD5_HMAC_BLOCK_SIZE;
+
+ /* Handle the fast case right here */
+ if (partial + len < MD5_HMAC_BLOCK_SIZE) {
+ sctx->byte_count += len;
+ memcpy((u8 *)sctx->block + partial, data, len);
+ } else
+ __md5_sparc64_update(sctx, data, len, partial);
+
+ return 0;
+}
+
+/* Add padding and return the message digest. */
+static int md5_sparc64_final(struct shash_desc *desc, u8 *out)
+{
+ struct md5_state *sctx = shash_desc_ctx(desc);
+ unsigned int i, index, padlen;
+ u32 *dst = (u32 *)out;
+ __le64 bits;
+ static const u8 padding[MD5_HMAC_BLOCK_SIZE] = { 0x80, };
+
+ bits = cpu_to_le64(sctx->byte_count << 3);
+
+ /* Pad out to 56 mod 64 and append length */
+ index = sctx->byte_count % MD5_HMAC_BLOCK_SIZE;
+ padlen = (index < 56) ? (56 - index) : ((MD5_HMAC_BLOCK_SIZE+56) - index);
+
+ /* We need to fill a whole block for __md5_sparc64_update() */
+ if (padlen <= 56) {
+ sctx->byte_count += padlen;
+ memcpy((u8 *)sctx->block + index, padding, padlen);
+ } else {
+ __md5_sparc64_update(sctx, padding, padlen, index);
+ }
+ __md5_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
+
+ /* Store state in digest */
+ for (i = 0; i < MD5_HASH_WORDS; i++)
+ dst[i] = sctx->hash[i];
+
+ /* Wipe context */
+ memset(sctx, 0, sizeof(*sctx));
+
+ return 0;
+}
+
+static int md5_sparc64_export(struct shash_desc *desc, void *out)
+{
+ struct md5_state *sctx = shash_desc_ctx(desc);
+
+ memcpy(out, sctx, sizeof(*sctx));
+
+ return 0;
+}
+
+static int md5_sparc64_import(struct shash_desc *desc, const void *in)
+{
+ struct md5_state *sctx = shash_desc_ctx(desc);
+
+ memcpy(sctx, in, sizeof(*sctx));
+
+ return 0;
+}
+
+static struct shash_alg alg = {
+ .digestsize = MD5_DIGEST_SIZE,
+ .init = md5_sparc64_init,
+ .update = md5_sparc64_update,
+ .final = md5_sparc64_final,
+ .export = md5_sparc64_export,
+ .import = md5_sparc64_import,
+ .descsize = sizeof(struct md5_state),
+ .statesize = sizeof(struct md5_state),
+ .base = {
+ .cra_name = "md5",
+ .cra_driver_name= "md5-sparc64",
+ .cra_priority = 150,
+ .cra_flags = CRYPTO_ALG_TYPE_SHASH,
+ .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
+ .cra_module = THIS_MODULE,
+ }
+};
+
+static bool __init sparc64_has_md5_opcode(void)
+{
+ unsigned long cfr;
+
+ if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
+ return false;
+
+ __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
+ if (!(cfr & CFR_MD5))
+ return false;
+
+ return true;
+}
+
+static int __init md5_sparc64_mod_init(void)
+{
+ if (sparc64_has_md5_opcode()) {
+ pr_info("Using sparc64 md5 opcode optimized MD5 implementation\n");
+ return crypto_register_shash(&alg);
+ }
+ pr_info("sparc64 md5 opcode not available.\n");
+ return -ENODEV;
+}
+
+static void __exit md5_sparc64_mod_fini(void)
+{
+ crypto_unregister_shash(&alg);
+}
+
+module_init(md5_sparc64_mod_init);
+module_exit(md5_sparc64_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("MD5 Secure Hash Algorithm, sparc64 md5 opcode accelerated");
+
+MODULE_ALIAS("md5");