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- // 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,go1.11,!gccgo,!appengine
-
- package poly1305
-
- // hasVectorFacility reports whether the machine supports
- // the vector facility (vx).
- func hasVectorFacility() bool
-
- // hasVMSLFacility reports whether the machine supports
- // Vector Multiply Sum Logical (VMSL).
- func hasVMSLFacility() bool
-
- var hasVX = hasVectorFacility()
- var hasVMSL = hasVMSLFacility()
-
- // poly1305vx is an assembly implementation of Poly1305 that uses vector
- // instructions. It must only be called if the vector facility (vx) is
- // available.
- //go:noescape
- func poly1305vx(out *[16]byte, m *byte, mlen uint64, key *[32]byte)
-
- // poly1305vmsl is an assembly implementation of Poly1305 that uses vector
- // instructions, including VMSL. It must only be called if the vector facility (vx) is
- // available and if VMSL is supported.
- //go:noescape
- func poly1305vmsl(out *[16]byte, m *byte, mlen uint64, key *[32]byte)
-
- // Sum generates an authenticator for m using a one-time key and puts the
- // 16-byte result into out. Authenticating two different messages with the same
- // key allows an attacker to forge messages at will.
- func Sum(out *[16]byte, m []byte, key *[32]byte) {
- if hasVX {
- var mPtr *byte
- if len(m) > 0 {
- mPtr = &m[0]
- }
- if hasVMSL && len(m) > 256 {
- poly1305vmsl(out, mPtr, uint64(len(m)), key)
- } else {
- poly1305vx(out, mPtr, uint64(len(m)), key)
- }
- } else {
- sumGeneric(out, m, key)
- }
- }
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