v4.19.13 snapshot.
diff --git a/crypto/sha1_generic.c b/crypto/sha1_generic.c
new file mode 100644
index 0000000..2af64ef
--- /dev/null
+++ b/crypto/sha1_generic.c
@@ -0,0 +1,102 @@
+/*
+ * 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>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+#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 <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[SHA_WORKSPACE_WORDS];
+
+ while (blocks--) {
+ sha_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);
+}
+
+module_init(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");