1 files changed, 0 insertions, 153 deletions
diff --git a/libgo/go/crypto/ecdsa/ecdsa_s390x.go b/libgo/go/crypto/ecdsa/ecdsa_s390x.go
deleted file mode 100644
index f07c3bf50c2..00000000000
--- a/libgo/go/crypto/ecdsa/ecdsa_s390x.go
+++ /dev/null
@@ -1,153 +0,0 @@
-// Copyright 2019 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
-
-package ecdsa
-
-import (
-	"crypto/cipher"
-	"crypto/elliptic"
-	"internal/cpu"
-	"math/big"
-)
-
-// s390x accelerated signatures
-//go:noescape
-func kdsaSig(fc uint64, block *[1720]byte) (errn uint64)
-
-type signverify int
-
-const (
-	signing signverify = iota
-	verifying
-)
-
-// bufferOffsets represents the offset of a particular parameter in
-// the buffer passed to the KDSA instruction.
-type bufferOffsets struct {
-	baseSize       int
-	hashSize       int
-	offsetHash     int
-	offsetKey1     int
-	offsetRNorKey2 int
-	offsetR        int
-	offsetS        int
-	functionCode   uint64
-}
-
-func canUseKDSA(sv signverify, c elliptic.Curve, bo *bufferOffsets) bool {
-	if !cpu.S390X.HasECDSA {
-		return false
-	}
-
-	switch c.Params().Name {
-	case "P-256":
-		bo.baseSize = 32
-		bo.hashSize = 32
-		bo.offsetHash = 64
-		bo.offsetKey1 = 96
-		bo.offsetRNorKey2 = 128
-		bo.offsetR = 0
-		bo.offsetS = 32
-		if sv == signing {
-			bo.functionCode = 137
-		} else {
-			bo.functionCode = 1
-		}
-		return true
-	case "P-384":
-		bo.baseSize = 48
-		bo.hashSize = 48
-		bo.offsetHash = 96
-		bo.offsetKey1 = 144
-		bo.offsetRNorKey2 = 192
-		bo.offsetR = 0
-		bo.offsetS = 48
-		if sv == signing {
-			bo.functionCode = 138
-		} else {
-			bo.functionCode = 2
-		}
-		return true
-	case "P-521":
-		bo.baseSize = 66
-		bo.hashSize = 80
-		bo.offsetHash = 160
-		bo.offsetKey1 = 254
-		bo.offsetRNorKey2 = 334
-		bo.offsetR = 14
-		bo.offsetS = 94
-		if sv == signing {
-			bo.functionCode = 139
-		} else {
-			bo.functionCode = 3
-		}
-		return true
-	}
-	return false
-}
-
-// zeroExtendAndCopy pads src with leading zeros until it has the size given.
-// It then copies the padded src into the dst. Bytes beyond size in dst are
-// not modified.
-func zeroExtendAndCopy(dst, src []byte, size int) {
-	nz := size - len(src)
-	if nz < 0 {
-		panic("src is too long")
-	}
-	// the compiler should replace this loop with a memclr call
-	z := dst[:nz]
-	for i := range z {
-		z[i] = 0
-	}
-	copy(dst[nz:size], src[:size-nz])
-	return
-}
-
-func sign(priv *PrivateKey, csprng *cipher.StreamReader, c elliptic.Curve, e *big.Int) (r, s *big.Int, err error) {
-	var bo bufferOffsets
-	if canUseKDSA(signing, c, &bo) && e.Sign() != 0 {
-		var buffer [1720]byte
-		for {
-			var k *big.Int
-			k, err = randFieldElement(c, csprng)
-			if err != nil {
-				return nil, nil, err
-			}
-			zeroExtendAndCopy(buffer[bo.offsetHash:], e.Bytes(), bo.hashSize)
-			zeroExtendAndCopy(buffer[bo.offsetKey1:], priv.D.Bytes(), bo.baseSize)
-			zeroExtendAndCopy(buffer[bo.offsetRNorKey2:], k.Bytes(), bo.baseSize)
-			errn := kdsaSig(bo.functionCode, &buffer)
-			if errn == 2 {
-				return nil, nil, errZeroParam
-			}
-			if errn == 0 { // success == 0 means successful signing
-				r = new(big.Int)
-				r.SetBytes(buffer[bo.offsetR : bo.offsetR+bo.baseSize])
-				s = new(big.Int)
-				s.SetBytes(buffer[bo.offsetS : bo.offsetS+bo.baseSize])
-				return
-			}
-			//at this point, it must be that errn == 1: retry
-		}
-	}
-	r, s, err = signGeneric(priv, csprng, c, e)
-	return
-}
-
-func verify(pub *PublicKey, c elliptic.Curve, e, r, s *big.Int) bool {
-	var bo bufferOffsets
-	if canUseKDSA(verifying, c, &bo) && e.Sign() != 0 {
-		var buffer [1720]byte
-		zeroExtendAndCopy(buffer[bo.offsetR:], r.Bytes(), bo.baseSize)
-		zeroExtendAndCopy(buffer[bo.offsetS:], s.Bytes(), bo.baseSize)
-		zeroExtendAndCopy(buffer[bo.offsetHash:], e.Bytes(), bo.hashSize)
-		zeroExtendAndCopy(buffer[bo.offsetKey1:], pub.X.Bytes(), bo.baseSize)
-		zeroExtendAndCopy(buffer[bo.offsetRNorKey2:], pub.Y.Bytes(), bo.baseSize)
-		errn := kdsaSig(bo.functionCode, &buffer)
-		return errn == 0
-	}
-	return verifyGeneric(pub, c, e, r, s)
-}