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+/* Glue code for MD5 hashing optimized for sparc64 crypto opcodes.
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+ *
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+ * This is based largely upon arch/x86/crypto/sha1_ssse3_glue.c
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+ * and crypto/md5.c which are:
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+ *
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+ * Copyright (c) Alan Smithee.
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+ * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
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+ * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
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+ * Copyright (c) Mathias Krause <minipli@googlemail.com>
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+ * Copyright (c) Cryptoapi developers.
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+ * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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+ */
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+
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+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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+
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+#include <crypto/internal/hash.h>
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+#include <linux/init.h>
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+#include <linux/module.h>
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+#include <linux/mm.h>
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+#include <linux/cryptohash.h>
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+#include <linux/types.h>
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+#include <crypto/md5.h>
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+
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+#include <asm/pstate.h>
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+#include <asm/elf.h>
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+
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+asmlinkage void md5_sparc64_transform(u32 *digest, const char *data,
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+ unsigned int rounds);
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+
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+static int md5_sparc64_init(struct shash_desc *desc)
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+{
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+ struct md5_state *mctx = shash_desc_ctx(desc);
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+
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+ mctx->hash[0] = cpu_to_le32(0x67452301);
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+ mctx->hash[1] = cpu_to_le32(0xefcdab89);
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+ mctx->hash[2] = cpu_to_le32(0x98badcfe);
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+ mctx->hash[3] = cpu_to_le32(0x10325476);
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+ mctx->byte_count = 0;
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+
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+ return 0;
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+}
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+
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+static void __md5_sparc64_update(struct md5_state *sctx, const u8 *data,
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+ unsigned int len, unsigned int partial)
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+{
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+ unsigned int done = 0;
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+
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+ sctx->byte_count += len;
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+ if (partial) {
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+ done = MD5_HMAC_BLOCK_SIZE - partial;
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+ memcpy((u8 *)sctx->block + partial, data, done);
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+ md5_sparc64_transform(sctx->hash, (u8 *)sctx->block, 1);
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+ }
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+ if (len - done >= MD5_HMAC_BLOCK_SIZE) {
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+ const unsigned int rounds = (len - done) / MD5_HMAC_BLOCK_SIZE;
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+
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+ md5_sparc64_transform(sctx->hash, data + done, rounds);
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+ done += rounds * MD5_HMAC_BLOCK_SIZE;
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+ }
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+
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+ memcpy(sctx->block, data + done, len - done);
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+}
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+
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+static int md5_sparc64_update(struct shash_desc *desc, const u8 *data,
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+ unsigned int len)
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+{
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+ struct md5_state *sctx = shash_desc_ctx(desc);
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+ unsigned int partial = sctx->byte_count % MD5_HMAC_BLOCK_SIZE;
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+
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+ /* Handle the fast case right here */
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+ if (partial + len < MD5_HMAC_BLOCK_SIZE) {
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+ sctx->byte_count += len;
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+ memcpy((u8 *)sctx->block + partial, data, len);
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+ } else
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+ __md5_sparc64_update(sctx, data, len, partial);
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+
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+ return 0;
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+}
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+
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+/* Add padding and return the message digest. */
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+static int md5_sparc64_final(struct shash_desc *desc, u8 *out)
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+{
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+ struct md5_state *sctx = shash_desc_ctx(desc);
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+ unsigned int i, index, padlen;
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+ u32 *dst = (u32 *)out;
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+ __le64 bits;
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+ static const u8 padding[MD5_HMAC_BLOCK_SIZE] = { 0x80, };
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+
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+ bits = cpu_to_le64(sctx->byte_count << 3);
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+
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+ /* Pad out to 56 mod 64 and append length */
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+ index = sctx->byte_count % MD5_HMAC_BLOCK_SIZE;
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+ padlen = (index < 56) ? (56 - index) : ((MD5_HMAC_BLOCK_SIZE+56) - index);
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+
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+ /* We need to fill a whole block for __md5_sparc64_update() */
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+ if (padlen <= 56) {
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+ sctx->byte_count += padlen;
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+ memcpy((u8 *)sctx->block + index, padding, padlen);
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+ } else {
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+ __md5_sparc64_update(sctx, padding, padlen, index);
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+ }
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+ __md5_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
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+
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+ /* Store state in digest */
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+ for (i = 0; i < MD5_HASH_WORDS; i++)
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+ dst[i] = sctx->hash[i];
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+
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+ /* Wipe context */
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+ memset(sctx, 0, sizeof(*sctx));
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+
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+ return 0;
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+}
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+
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+static int md5_sparc64_export(struct shash_desc *desc, void *out)
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+{
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+ struct md5_state *sctx = shash_desc_ctx(desc);
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+
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+ memcpy(out, sctx, sizeof(*sctx));
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+
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+ return 0;
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+}
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+
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+static int md5_sparc64_import(struct shash_desc *desc, const void *in)
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+{
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+ struct md5_state *sctx = shash_desc_ctx(desc);
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+
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+ memcpy(sctx, in, sizeof(*sctx));
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+
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+ return 0;
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+}
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+
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+static struct shash_alg alg = {
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+ .digestsize = MD5_DIGEST_SIZE,
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+ .init = md5_sparc64_init,
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+ .update = md5_sparc64_update,
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+ .final = md5_sparc64_final,
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+ .export = md5_sparc64_export,
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+ .import = md5_sparc64_import,
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+ .descsize = sizeof(struct md5_state),
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+ .statesize = sizeof(struct md5_state),
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+ .base = {
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+ .cra_name = "md5",
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+ .cra_driver_name= "md5-sparc64",
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+ .cra_priority = 150,
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+ .cra_flags = CRYPTO_ALG_TYPE_SHASH,
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+ .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
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+ .cra_module = THIS_MODULE,
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+ }
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+};
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+
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+static bool __init sparc64_has_md5_opcode(void)
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+{
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+ unsigned long cfr;
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+
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+ if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
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+ return false;
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+
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+ __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
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+ if (!(cfr & CFR_MD5))
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+ return false;
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+
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+ return true;
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+}
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+
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+static int __init md5_sparc64_mod_init(void)
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+{
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+ if (sparc64_has_md5_opcode()) {
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+ pr_info("Using sparc64 md5 opcode optimized MD5 implementation\n");
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+ return crypto_register_shash(&alg);
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+ }
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+ pr_info("sparc64 md5 opcode not available.\n");
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+ return -ENODEV;
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+}
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+
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+static void __exit md5_sparc64_mod_fini(void)
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+{
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+ crypto_unregister_shash(&alg);
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+}
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+
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+module_init(md5_sparc64_mod_init);
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+module_exit(md5_sparc64_mod_fini);
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+
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+MODULE_LICENSE("GPL");
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+MODULE_DESCRIPTION("MD5 Secure Hash Algorithm, sparc64 md5 opcode accelerated");
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+
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+MODULE_ALIAS("md5");
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David S. Miller