1 files changed, 101 insertions, 0 deletions
diff --git a/src/crypto/include/zinc/blake2s.h b/src/crypto/include/zinc/blake2s.h
new file mode 100644
index 0000000..0e50836
--- /dev/null
+++ b/src/crypto/include/zinc/blake2s.h
@@ -0,0 +1,101 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ */
+
+#ifndef _ZINC_BLAKE2S_H
+#define _ZINC_BLAKE2S_H
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <crypto/algapi.h>
+
+enum blake2s_lengths {
+	BLAKE2S_BLOCKBYTES = 64,
+	BLAKE2S_OUTBYTES = 32,
+	BLAKE2S_KEYBYTES = 32
+};
+
+struct blake2s_state {
+	u32 h[8];
+	u32 t[2];
+	u32 f[2];
+	u8 buf[BLAKE2S_BLOCKBYTES];
+	size_t buflen;
+	u8 last_node;
+};
+
+void blake2s_init(struct blake2s_state *state, const size_t outlen);
+void blake2s_init_key(struct blake2s_state *state, const size_t outlen,
+		      const void *key, const size_t keylen);
+void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen);
+void __blake2s_final(struct blake2s_state *state);
+static inline void blake2s_final(struct blake2s_state *state, u8 *out,
+				 const size_t outlen)
+{
+	int i;
+
+#ifdef DEBUG
+	BUG_ON(!out || !outlen || outlen > BLAKE2S_OUTBYTES);
+#endif
+	__blake2s_final(state);
+
+	if (__builtin_constant_p(outlen) && !(outlen % sizeof(u32))) {
+		if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
+		    IS_ALIGNED((unsigned long)out, __alignof__(u32))) {
+			__le32 *outwords = (__le32 *)out;
+
+			for (i = 0; i < outlen / sizeof(u32); ++i)
+				outwords[i] = cpu_to_le32(state->h[i]);
+		} else {
+			__le32 buffer[BLAKE2S_OUTBYTES];
+
+			for (i = 0; i < outlen / sizeof(u32); ++i)
+				buffer[i] = cpu_to_le32(state->h[i]);
+			memcpy(out, buffer, outlen);
+			memzero_explicit(buffer, sizeof(buffer));
+		}
+	} else {
+		u8 buffer[BLAKE2S_OUTBYTES] __aligned(__alignof__(u32));
+		__le32 *outwords = (__le32 *)buffer;
+
+		for (i = 0; i < 8; ++i)
+			outwords[i] = cpu_to_le32(state->h[i]);
+		memcpy(out, buffer, outlen);
+		memzero_explicit(buffer, sizeof(buffer));
+	}
+
+	memzero_explicit(state, sizeof(struct blake2s_state));
+}
+
+static inline void blake2s(u8 *out, const u8 *in, const u8 *key,
+			   const size_t outlen, const size_t inlen,
+			   const size_t keylen)
+{
+	struct blake2s_state state;
+
+#ifdef DEBUG
+	BUG_ON((!in && inlen > 0) || !out || !outlen ||
+	       outlen > BLAKE2S_OUTBYTES || keylen > BLAKE2S_KEYBYTES ||
+	       (!key && keylen));
+#endif
+
+	if (keylen)
+		blake2s_init_key(&state, outlen, key, keylen);
+	else
+		blake2s_init(&state, outlen);
+
+	blake2s_update(&state, in, inlen);
+	blake2s_final(&state, out, outlen);
+}
+
+void blake2s_hmac(u8 *out, const u8 *in, const u8 *key, const size_t outlen,
+		  const size_t inlen, const size_t keylen);
+
+void blake2s_fpu_init(void);
+
+#ifdef DEBUG
+bool blake2s_selftest(void);
+#endif
+
+#endif /* _ZINC_BLAKE2S_H */