| // 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. |
| |
| #include "textflag.h" |
| |
| // func kdsaSig(fc uint64, block *[1720]byte) (errn uint64) |
| TEXT ·kdsaSig(SB), NOSPLIT|NOFRAME, $0-24 |
| MOVD fc+0(FP), R0 // function code |
| MOVD block+8(FP), R1 // address parameter block |
| |
| loop: |
| WORD $0xB93A0008 // compute digital signature authentication |
| BVS loop // branch back if interrupted |
| BEQ success // signature creation successful |
| BGT retry // signing unsuccessful, but retry with new CSPRN |
| |
| error: |
| MOVD $2, R2 // fallthrough indicates fatal error |
| MOVD R2, errn+16(FP) // return 2 - sign/verify abort |
| RET |
| |
| retry: |
| MOVD $1, R2 |
| MOVD R2, errn+16(FP) // return 1 - sign/verify was unsuccessful -- if sign, retry with new RN |
| RET |
| |
| success: |
| MOVD $0, R2 |
| MOVD R2, errn+16(FP) // return 0 - sign/verify was successful |
| RET |
