1 files changed, 96 insertions, 0 deletions
diff --git a/crypto/sha1_generic.c b/crypto/sha1_generic.c
new file mode 100644
index 000000000..325b57fe2
--- /dev/null
+++ b/crypto/sha1_generic.c
@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Cryptographic API.
+ *
+ * SHA1 Secure Hash Algorithm.
+ *
+ * Derived from cryptoapi implementation, adapted for in-place
+ * scatterlist interface.
+ *
+ * Copyright (c) Alan Smithee.
+ * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
+ * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
+ */
+#include <crypto/internal/hash.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/types.h>
+#include <crypto/sha1.h>
+#include <crypto/sha1_base.h>
+#include <asm/byteorder.h>
+
+const u8 sha1_zero_message_hash[SHA1_DIGEST_SIZE] = {
+	0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d,
+	0x32, 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90,
+	0xaf, 0xd8, 0x07, 0x09
+};
+EXPORT_SYMBOL_GPL(sha1_zero_message_hash);
+
+static void sha1_generic_block_fn(struct sha1_state *sst, u8 const *src,
+				  int blocks)
+{
+	u32 temp[SHA1_WORKSPACE_WORDS];
+
+	while (blocks--) {
+		sha1_transform(sst->state, src, temp);
+		src += SHA1_BLOCK_SIZE;
+	}
+	memzero_explicit(temp, sizeof(temp));
+}
+
+int crypto_sha1_update(struct shash_desc *desc, const u8 *data,
+		       unsigned int len)
+{
+	return sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
+}
+EXPORT_SYMBOL(crypto_sha1_update);
+
+static int sha1_final(struct shash_desc *desc, u8 *out)
+{
+	sha1_base_do_finalize(desc, sha1_generic_block_fn);
+	return sha1_base_finish(desc, out);
+}
+
+int crypto_sha1_finup(struct shash_desc *desc, const u8 *data,
+		      unsigned int len, u8 *out)
+{
+	sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
+	return sha1_final(desc, out);
+}
+EXPORT_SYMBOL(crypto_sha1_finup);
+
+static struct shash_alg alg = {
+	.digestsize	=	SHA1_DIGEST_SIZE,
+	.init		=	sha1_base_init,
+	.update		=	crypto_sha1_update,
+	.final		=	sha1_final,
+	.finup		=	crypto_sha1_finup,
+	.descsize	=	sizeof(struct sha1_state),
+	.base		=	{
+		.cra_name	=	"sha1",
+		.cra_driver_name=	"sha1-generic",
+		.cra_priority	=	100,
+		.cra_blocksize	=	SHA1_BLOCK_SIZE,
+		.cra_module	=	THIS_MODULE,
+	}
+};
+
+static int __init sha1_generic_mod_init(void)
+{
+	return crypto_register_shash(&alg);
+}
+
+static void __exit sha1_generic_mod_fini(void)
+{
+	crypto_unregister_shash(&alg);
+}
+
+subsys_initcall(sha1_generic_mod_init);
+module_exit(sha1_generic_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
+
+MODULE_ALIAS_CRYPTO("sha1");
+MODULE_ALIAS_CRYPTO("sha1-generic");