| // 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. |
| |
| //go:build !purego |
| |
| #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 |
