sparc64: Add SHA224/SHA256 driver making use of the 'sha256' 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/sha256_glue.c b/arch/sparc/crypto/sha256_glue.c
new file mode 100644
index 0000000..75e1ade
--- /dev/null
+++ b/arch/sparc/crypto/sha256_glue.c
@@ -0,0 +1,237 @@
+/* Glue code for SHA256 hashing optimized for sparc64 crypto opcodes.
+ *
+ * This is based largely upon crypto/sha256_generic.c
+ *
+ * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
+ * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
+ * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
+ * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.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>
+
+asmlinkage void sha256_sparc64_transform(u32 *digest, const char *data,
+ unsigned int rounds);
+
+static int sha224_sparc64_init(struct shash_desc *desc)
+{
+ struct sha256_state *sctx = shash_desc_ctx(desc);
+ sctx->state[0] = SHA224_H0;
+ sctx->state[1] = SHA224_H1;
+ sctx->state[2] = SHA224_H2;
+ sctx->state[3] = SHA224_H3;
+ sctx->state[4] = SHA224_H4;
+ sctx->state[5] = SHA224_H5;
+ sctx->state[6] = SHA224_H6;
+ sctx->state[7] = SHA224_H7;
+ sctx->count = 0;
+
+ return 0;
+}
+
+static int sha256_sparc64_init(struct shash_desc *desc)
+{
+ struct sha256_state *sctx = shash_desc_ctx(desc);
+ sctx->state[0] = SHA256_H0;
+ sctx->state[1] = SHA256_H1;
+ sctx->state[2] = SHA256_H2;
+ sctx->state[3] = SHA256_H3;
+ sctx->state[4] = SHA256_H4;
+ sctx->state[5] = SHA256_H5;
+ sctx->state[6] = SHA256_H6;
+ sctx->state[7] = SHA256_H7;
+ sctx->count = 0;
+
+ return 0;
+}
+
+static void __sha256_sparc64_update(struct sha256_state *sctx, const u8 *data,
+ unsigned int len, unsigned int partial)
+{
+ unsigned int done = 0;
+
+ sctx->count += len;
+ if (partial) {
+ done = SHA256_BLOCK_SIZE - partial;
+ memcpy(sctx->buf + partial, data, done);
+ sha256_sparc64_transform(sctx->state, sctx->buf, 1);
+ }
+ if (len - done >= SHA256_BLOCK_SIZE) {
+ const unsigned int rounds = (len - done) / SHA256_BLOCK_SIZE;
+
+ sha256_sparc64_transform(sctx->state, data + done, rounds);
+ done += rounds * SHA256_BLOCK_SIZE;
+ }
+
+ memcpy(sctx->buf, data + done, len - done);
+}
+
+static int sha256_sparc64_update(struct shash_desc *desc, const u8 *data,
+ unsigned int len)
+{
+ struct sha256_state *sctx = shash_desc_ctx(desc);
+ unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
+
+ /* Handle the fast case right here */
+ if (partial + len < SHA256_BLOCK_SIZE) {
+ sctx->count += len;
+ memcpy(sctx->buf + partial, data, len);
+ } else
+ __sha256_sparc64_update(sctx, data, len, partial);
+
+ return 0;
+}
+
+static int sha256_sparc64_final(struct shash_desc *desc, u8 *out)
+{
+ struct sha256_state *sctx = shash_desc_ctx(desc);
+ unsigned int i, index, padlen;
+ __be32 *dst = (__be32 *)out;
+ __be64 bits;
+ static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, };
+
+ bits = cpu_to_be64(sctx->count << 3);
+
+ /* Pad out to 56 mod 64 and append length */
+ index = sctx->count % SHA256_BLOCK_SIZE;
+ padlen = (index < 56) ? (56 - index) : ((SHA256_BLOCK_SIZE+56) - index);
+
+ /* We need to fill a whole block for __sha256_sparc64_update() */
+ if (padlen <= 56) {
+ sctx->count += padlen;
+ memcpy(sctx->buf + index, padding, padlen);
+ } else {
+ __sha256_sparc64_update(sctx, padding, padlen, index);
+ }
+ __sha256_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
+
+ /* Store state in digest */
+ for (i = 0; i < 8; i++)
+ dst[i] = cpu_to_be32(sctx->state[i]);
+
+ /* Wipe context */
+ memset(sctx, 0, sizeof(*sctx));
+
+ return 0;
+}
+
+static int sha224_sparc64_final(struct shash_desc *desc, u8 *hash)
+{
+ u8 D[SHA256_DIGEST_SIZE];
+
+ sha256_sparc64_final(desc, D);
+
+ memcpy(hash, D, SHA224_DIGEST_SIZE);
+ memset(D, 0, SHA256_DIGEST_SIZE);
+
+ return 0;
+}
+
+static int sha256_sparc64_export(struct shash_desc *desc, void *out)
+{
+ struct sha256_state *sctx = shash_desc_ctx(desc);
+
+ memcpy(out, sctx, sizeof(*sctx));
+ return 0;
+}
+
+static int sha256_sparc64_import(struct shash_desc *desc, const void *in)
+{
+ struct sha256_state *sctx = shash_desc_ctx(desc);
+
+ memcpy(sctx, in, sizeof(*sctx));
+ return 0;
+}
+
+static struct shash_alg sha256 = {
+ .digestsize = SHA256_DIGEST_SIZE,
+ .init = sha256_sparc64_init,
+ .update = sha256_sparc64_update,
+ .final = sha256_sparc64_final,
+ .export = sha256_sparc64_export,
+ .import = sha256_sparc64_import,
+ .descsize = sizeof(struct sha256_state),
+ .statesize = sizeof(struct sha256_state),
+ .base = {
+ .cra_name = "sha256",
+ .cra_driver_name= "sha256-sparc64",
+ .cra_flags = CRYPTO_ALG_TYPE_SHASH,
+ .cra_blocksize = SHA256_BLOCK_SIZE,
+ .cra_module = THIS_MODULE,
+ }
+};
+
+static struct shash_alg sha224 = {
+ .digestsize = SHA224_DIGEST_SIZE,
+ .init = sha224_sparc64_init,
+ .update = sha256_sparc64_update,
+ .final = sha224_sparc64_final,
+ .descsize = sizeof(struct sha256_state),
+ .base = {
+ .cra_name = "sha224",
+ .cra_driver_name= "sha224-sparc64",
+ .cra_flags = CRYPTO_ALG_TYPE_SHASH,
+ .cra_blocksize = SHA224_BLOCK_SIZE,
+ .cra_module = THIS_MODULE,
+ }
+};
+
+static bool __init sparc64_has_sha256_opcode(void)
+{
+ unsigned long cfr;
+
+ if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
+ return false;
+
+ __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
+ if (!(cfr & CFR_SHA256))
+ return false;
+
+ return true;
+}
+
+static int __init sha256_sparc64_mod_init(void)
+{
+ if (sparc64_has_sha256_opcode()) {
+ int ret = crypto_register_shash(&sha224);
+ if (ret < 0)
+ return ret;
+
+ ret = crypto_register_shash(&sha256);
+ if (ret < 0) {
+ crypto_unregister_shash(&sha224);
+ return ret;
+ }
+
+ pr_info("Using sparc64 sha256 opcode optimized SHA-256/SHA-224 implementation\n");
+ return 0;
+ }
+ pr_info("sparc64 sha256 opcode not available.\n");
+ return -ENODEV;
+}
+
+static void __exit sha256_sparc64_mod_fini(void)
+{
+ crypto_unregister_shash(&sha224);
+ crypto_unregister_shash(&sha256);
+}
+
+module_init(sha256_sparc64_mod_init);
+module_exit(sha256_sparc64_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm, sparc64 sha256 opcode accelerated");
+
+MODULE_ALIAS("sha224");
+MODULE_ALIAS("sha256");