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diff --git a/internal/chacha20/chacha_s390x.go b/internal/chacha20/chacha_s390x.go
new file mode 100644
index 0000000..aad645b
--- /dev/null
+++ b/internal/chacha20/chacha_s390x.go
@@ -0,0 +1,29 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build s390x,!gccgo,!appengine
+
+package chacha20
+
+import (
+	"golang.org/x/sys/cpu"
+)
+
+var haveAsm = cpu.S390X.HasVX
+
+const bufSize = 256
+
+// xorKeyStreamVX is an assembly implementation of XORKeyStream. It must only
+// be called when the vector facility is available.
+// Implementation in asm_s390x.s.
+//go:noescape
+func xorKeyStreamVX(dst, src []byte, key *[8]uint32, nonce *[3]uint32, counter *uint32, buf *[256]byte, len *int)
+
+func (c *Cipher) xorKeyStreamAsm(dst, src []byte) {
+	xorKeyStreamVX(dst, src, &c.key, &c.nonce, &c.counter, &c.buf, &c.len)
+}
+
+// EXRL targets, DO NOT CALL!
+func mvcSrcToBuf()
+func mvcBufToDst()