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// 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:
KDSA R0, R4 // 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
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