From 8517dd463d2b823b5c406a4e2c98c41547e542a5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=A9ter=20Szil=C3=A1gyi?= <peterke@gmail.com>
Date: Thu, 22 Aug 2019 11:22:16 +0300
Subject: [PATCH] crypto/blake2b: fix non-amd64 builds

---
 crypto/blake2b/blake2b_f_fuzz.go | 57 ++++++++++++++++++++++++++++++++
 crypto/blake2b/blake2b_ref.go    |  4 ---
 2 files changed, 57 insertions(+), 4 deletions(-)
 create mode 100644 crypto/blake2b/blake2b_f_fuzz.go

diff --git a/crypto/blake2b/blake2b_f_fuzz.go b/crypto/blake2b/blake2b_f_fuzz.go
new file mode 100644
index 000000000..ab7334280
--- /dev/null
+++ b/crypto/blake2b/blake2b_f_fuzz.go
@@ -0,0 +1,57 @@
+// +build gofuzz
+
+package blake2b
+
+import (
+	"encoding/binary"
+)
+
+func Fuzz(data []byte) int {
+	// Make sure the data confirms to the input model
+	if len(data) != 211 {
+		return 0
+	}
+	// Parse everything and call all the implementations
+	var (
+		rounds = binary.BigEndian.Uint16(data[0:2])
+
+		h [8]uint64
+		m [16]uint64
+		t [2]uint64
+		f uint64
+	)
+	for i := 0; i < 8; i++ {
+		offset := 2 + i*8
+		h[i] = binary.LittleEndian.Uint64(data[offset : offset+8])
+	}
+	for i := 0; i < 16; i++ {
+		offset := 66 + i*8
+		m[i] = binary.LittleEndian.Uint64(data[offset : offset+8])
+	}
+	t[0] = binary.LittleEndian.Uint64(data[194:202])
+	t[1] = binary.LittleEndian.Uint64(data[202:210])
+
+	if data[210]%2 == 1 { // Avoid spinning the fuzzer to hit 0/1
+		f = 0xFFFFFFFFFFFFFFFF
+	}
+	// Run the blake2b compression on all instruction sets and cross reference
+	want := h
+	fGeneric(&want, &m, t[0], t[1], f, uint64(rounds))
+
+	have := h
+	fSSE4(&have, &m, t[0], t[1], f, uint64(rounds))
+	if have != want {
+		panic("SSE4 mismatches generic algo")
+	}
+	have = h
+	fAVX(&have, &m, t[0], t[1], f, uint64(rounds))
+	if have != want {
+		panic("AVX mismatches generic algo")
+	}
+	have = h
+	fAVX2(&have, &m, t[0], t[1], f, uint64(rounds))
+	if have != want {
+		panic("AVX2 mismatches generic algo")
+	}
+	return 1
+}
diff --git a/crypto/blake2b/blake2b_ref.go b/crypto/blake2b/blake2b_ref.go
index 88742139d..874c2d97a 100644
--- a/crypto/blake2b/blake2b_ref.go
+++ b/crypto/blake2b/blake2b_ref.go
@@ -6,10 +6,6 @@
 
 package blake2b
 
-func hashBlocks(h *[8]uint64, c *[2]uint64, flag uint64, blocks []byte) {
-	hashBlocksGeneric(h, c, flag, blocks)
-}
-
 func f(h *[8]uint64, m [16]uint64, c0, c1 uint64, flag uint64, rounds int) {
 	fGeneric(h, m, c0, c1, flag, rounds)
 }