1 // Copyright 2020 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4 5 //go:build !purego
6 7 #include "textflag.h"
8 9 // func kdsa(fc uint64, params *[4096]byte) (errn uint64)
10 TEXT ·kdsa(SB), NOSPLIT|NOFRAME, $0-24
11 MOVD fc+0(FP), R0 // function code
12 MOVD params+8(FP), R1 // address parameter block
13 14 loop:
15 KDSA R0, R4 // compute digital signature authentication
16 BVS loop // branch back if interrupted
17 BGT retry // signing unsuccessful, but retry with new CSPRN
18 BLT error // condition code of 1 indicates a failure
19 20 success:
21 MOVD $0, errn+16(FP) // return 0 - sign/verify was successful
22 RET
23 24 error:
25 MOVD $1, errn+16(FP) // return 1 - sign/verify failed
26 RET
27 28 retry:
29 MOVD $2, errn+16(FP) // return 2 - sign/verify was unsuccessful -- if sign, retry with new RN
30 RET
31