1 files changed, 109 insertions, 0 deletions
diff --git a/include/crypto/sha1_base.h b/include/crypto/sha1_base.h
new file mode 100644
index 000000000..2e0e7c382
--- /dev/null
+++ b/include/crypto/sha1_base.h
@@ -0,0 +1,109 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * sha1_base.h - core logic for SHA-1 implementations
+ *
+ * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
+ */
+
+#ifndef _CRYPTO_SHA1_BASE_H
+#define _CRYPTO_SHA1_BASE_H
+
+#include <crypto/internal/hash.h>
+#include <crypto/sha1.h>
+#include <linux/crypto.h>
+#include <linux/module.h>
+#include <linux/string.h>
+
+#include <asm/unaligned.h>
+
+typedef void (sha1_block_fn)(struct sha1_state *sst, u8 const *src, int blocks);
+
+static inline int sha1_base_init(struct shash_desc *desc)
+{
+	struct sha1_state *sctx = shash_desc_ctx(desc);
+
+	sctx->state[0] = SHA1_H0;
+	sctx->state[1] = SHA1_H1;
+	sctx->state[2] = SHA1_H2;
+	sctx->state[3] = SHA1_H3;
+	sctx->state[4] = SHA1_H4;
+	sctx->count = 0;
+
+	return 0;
+}
+
+static inline int sha1_base_do_update(struct shash_desc *desc,
+				      const u8 *data,
+				      unsigned int len,
+				      sha1_block_fn *block_fn)
+{
+	struct sha1_state *sctx = shash_desc_ctx(desc);
+	unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
+
+	sctx->count += len;
+
+	if (unlikely((partial + len) >= SHA1_BLOCK_SIZE)) {
+		int blocks;
+
+		if (partial) {
+			int p = SHA1_BLOCK_SIZE - partial;
+
+			memcpy(sctx->buffer + partial, data, p);
+			data += p;
+			len -= p;
+
+			block_fn(sctx, sctx->buffer, 1);
+		}
+
+		blocks = len / SHA1_BLOCK_SIZE;
+		len %= SHA1_BLOCK_SIZE;
+
+		if (blocks) {
+			block_fn(sctx, data, blocks);
+			data += blocks * SHA1_BLOCK_SIZE;
+		}
+		partial = 0;
+	}
+	if (len)
+		memcpy(sctx->buffer + partial, data, len);
+
+	return 0;
+}
+
+static inline int sha1_base_do_finalize(struct shash_desc *desc,
+					sha1_block_fn *block_fn)
+{
+	const int bit_offset = SHA1_BLOCK_SIZE - sizeof(__be64);
+	struct sha1_state *sctx = shash_desc_ctx(desc);
+	__be64 *bits = (__be64 *)(sctx->buffer + bit_offset);
+	unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
+
+	sctx->buffer[partial++] = 0x80;
+	if (partial > bit_offset) {
+		memset(sctx->buffer + partial, 0x0, SHA1_BLOCK_SIZE - partial);
+		partial = 0;
+
+		block_fn(sctx, sctx->buffer, 1);
+	}
+
+	memset(sctx->buffer + partial, 0x0, bit_offset - partial);
+	*bits = cpu_to_be64(sctx->count << 3);
+	block_fn(sctx, sctx->buffer, 1);
+
+	return 0;
+}
+
+static inline int sha1_base_finish(struct shash_desc *desc, u8 *out)
+{
+	struct sha1_state *sctx = shash_desc_ctx(desc);
+	__be32 *digest = (__be32 *)out;
+	int i;
+
+	for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(__be32); i++)
+		put_unaligned_be32(sctx->state[i], digest++);
+
+	memzero_explicit(sctx, sizeof(*sctx));
+	return 0;
+}
+
+#endif /* _CRYPTO_SHA1_BASE_H */