Adding upstream version 1.19.8.upstream/1.19.8upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 28 insertions, 0 deletions

diff --git a/src/crypto/ecdsa/ecdsa_s390x.s b/src/crypto/ecdsa/ecdsa_s390x.s
new file mode 100644
index 0000000..ba5b3bf
--- /dev/null
+++ b/src/crypto/ecdsa/ecdsa_s390x.s
@@ -0,0 +1,28 @@
+// Copyright 2020 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.
+
+#include "textflag.h"
+
+// func kdsa(fc uint64, params *[4096]byte) (errn uint64)
+TEXT ·kdsa(SB), NOSPLIT|NOFRAME, $0-24
+	MOVD fc+0(FP), R0     // function code
+	MOVD params+8(FP), R1 // address parameter block
+
+loop:
+	WORD $0xB93A0008 // compute digital signature authentication
+	BVS  loop        // branch back if interrupted
+	BGT  retry       // signing unsuccessful, but retry with new CSPRN
+	BLT  error       // condition code of 1 indicates a failure
+
+success:
+	MOVD $0, errn+16(FP) // return 0 - sign/verify was successful
+	RET
+
+error:
+	MOVD $1, errn+16(FP) // return 1 - sign/verify failed
+	RET
+
+retry:
+	MOVD $2, errn+16(FP) // return 2 - sign/verify was unsuccessful -- if sign, retry with new RN
+	RET