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@@ -0,0 +1,203 @@
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+/*
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+ * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions
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+ *
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+ * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+
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+#include <crypto/internal/hash.h>
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+#include <crypto/sha.h>
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+#include <linux/crypto.h>
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+#include <linux/module.h>
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+
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+#include <asm/hwcap.h>
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+#include <asm/simd.h>
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+#include <asm/neon.h>
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+#include <asm/unaligned.h>
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+
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+MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
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+MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
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+MODULE_LICENSE("GPL v2");
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+
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+asmlinkage void sha2_ce_transform(int blocks, u8 const *src, u32 *state,
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+ u8 *head);
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+
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+static int sha224_init(struct shash_desc *desc)
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+{
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+ struct sha256_state *sctx = shash_desc_ctx(desc);
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+
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+ *sctx = (struct sha256_state){
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+ .state = {
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+ SHA224_H0, SHA224_H1, SHA224_H2, SHA224_H3,
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+ SHA224_H4, SHA224_H5, SHA224_H6, SHA224_H7,
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+ }
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+ };
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+ return 0;
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+}
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+
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+static int sha256_init(struct shash_desc *desc)
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+{
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+ struct sha256_state *sctx = shash_desc_ctx(desc);
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+
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+ *sctx = (struct sha256_state){
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+ .state = {
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+ SHA256_H0, SHA256_H1, SHA256_H2, SHA256_H3,
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+ SHA256_H4, SHA256_H5, SHA256_H6, SHA256_H7,
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+ }
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+ };
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+ return 0;
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+}
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+
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+static int sha2_update(struct shash_desc *desc, const u8 *data,
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+ unsigned int len)
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+{
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+ struct sha256_state *sctx = shash_desc_ctx(desc);
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+ unsigned int partial;
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+
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+ if (!may_use_simd())
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+ return crypto_sha256_update(desc, data, len);
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+
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+ partial = sctx->count % SHA256_BLOCK_SIZE;
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+ sctx->count += len;
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+
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+ if ((partial + len) >= SHA256_BLOCK_SIZE) {
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+ int blocks;
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+
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+ if (partial) {
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+ int p = SHA256_BLOCK_SIZE - partial;
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+
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+ memcpy(sctx->buf + partial, data, p);
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+ data += p;
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+ len -= p;
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+ }
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+
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+ blocks = len / SHA256_BLOCK_SIZE;
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+ len %= SHA256_BLOCK_SIZE;
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+
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+ kernel_neon_begin();
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+ sha2_ce_transform(blocks, data, sctx->state,
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+ partial ? sctx->buf : NULL);
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+ kernel_neon_end();
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+
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+ data += blocks * SHA256_BLOCK_SIZE;
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+ partial = 0;
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+ }
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+ if (len)
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+ memcpy(sctx->buf + partial, data, len);
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+ return 0;
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+}
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+
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+static void sha2_final(struct shash_desc *desc)
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+{
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+ static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, };
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+
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+ struct sha256_state *sctx = shash_desc_ctx(desc);
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+ __be64 bits = cpu_to_be64(sctx->count << 3);
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+ u32 padlen = SHA256_BLOCK_SIZE
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+ - ((sctx->count + sizeof(bits)) % SHA256_BLOCK_SIZE);
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+
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+ sha2_update(desc, padding, padlen);
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+ sha2_update(desc, (const u8 *)&bits, sizeof(bits));
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+}
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+
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+static int sha224_final(struct shash_desc *desc, u8 *out)
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+{
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+ struct sha256_state *sctx = shash_desc_ctx(desc);
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+ __be32 *dst = (__be32 *)out;
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+ int i;
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+
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+ sha2_final(desc);
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+
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+ for (i = 0; i < SHA224_DIGEST_SIZE / sizeof(__be32); i++)
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+ put_unaligned_be32(sctx->state[i], dst++);
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+
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+ *sctx = (struct sha256_state){};
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+ return 0;
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+}
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+
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+static int sha256_final(struct shash_desc *desc, u8 *out)
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+{
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+ struct sha256_state *sctx = shash_desc_ctx(desc);
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+ __be32 *dst = (__be32 *)out;
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+ int i;
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+
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+ sha2_final(desc);
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+
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+ for (i = 0; i < SHA256_DIGEST_SIZE / sizeof(__be32); i++)
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+ put_unaligned_be32(sctx->state[i], dst++);
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+
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+ *sctx = (struct sha256_state){};
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+ return 0;
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+}
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+
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+static int sha2_export(struct shash_desc *desc, void *out)
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+{
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+ struct sha256_state *sctx = shash_desc_ctx(desc);
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+ struct sha256_state *dst = out;
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+
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+ *dst = *sctx;
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+ return 0;
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+}
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+
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+static int sha2_import(struct shash_desc *desc, const void *in)
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+{
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+ struct sha256_state *sctx = shash_desc_ctx(desc);
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+ struct sha256_state const *src = in;
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+
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+ *sctx = *src;
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+ return 0;
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+}
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+
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+static struct shash_alg algs[] = { {
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+ .init = sha224_init,
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+ .update = sha2_update,
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+ .final = sha224_final,
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+ .export = sha2_export,
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+ .import = sha2_import,
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+ .descsize = sizeof(struct sha256_state),
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+ .digestsize = SHA224_DIGEST_SIZE,
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+ .statesize = sizeof(struct sha256_state),
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+ .base = {
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+ .cra_name = "sha224",
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+ .cra_driver_name = "sha224-ce",
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+ .cra_priority = 200,
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+ .cra_flags = CRYPTO_ALG_TYPE_SHASH,
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+ .cra_blocksize = SHA256_BLOCK_SIZE,
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+ .cra_module = THIS_MODULE,
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+ }
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+}, {
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+ .init = sha256_init,
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+ .update = sha2_update,
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+ .final = sha256_final,
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+ .export = sha2_export,
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+ .import = sha2_import,
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+ .descsize = sizeof(struct sha256_state),
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+ .digestsize = SHA256_DIGEST_SIZE,
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+ .statesize = sizeof(struct sha256_state),
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+ .base = {
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+ .cra_name = "sha256",
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+ .cra_driver_name = "sha256-ce",
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+ .cra_priority = 200,
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+ .cra_flags = CRYPTO_ALG_TYPE_SHASH,
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+ .cra_blocksize = SHA256_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 int __init sha2_ce_mod_init(void)
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+{
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+ if (!(elf_hwcap2 & HWCAP2_SHA2))
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+ return -ENODEV;
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+ return crypto_register_shashes(algs, ARRAY_SIZE(algs));
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+}
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+
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+static void __exit sha2_ce_mod_fini(void)
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+{
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+ crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
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+}
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+
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+module_init(sha2_ce_mod_init);
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+module_exit(sha2_ce_mod_fini);
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Ard Biesheuvel