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Diffstat (limited to 'src/crypto/rc4/rc4_386.s')
| -rw-r--r-- | src/crypto/rc4/rc4_386.s | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/src/crypto/rc4/rc4_386.s b/src/crypto/rc4/rc4_386.s new file mode 100644 index 000000000..54221036b --- /dev/null +++ b/src/crypto/rc4/rc4_386.s @@ -0,0 +1,53 @@ +// Copyright 2013 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 xorKeyStream(dst, src *byte, n int, state *[256]byte, i, j *uint8) +TEXT ·xorKeyStream(SB),NOSPLIT,$0 + MOVL dst+0(FP), DI + MOVL src+4(FP), SI + MOVL state+12(FP), BP + + MOVL i+16(FP), AX + MOVBLZX (AX), AX + MOVL j+20(FP), BX + MOVBLZX (BX), BX + CMPL n+8(FP), $0 + JEQ done + +loop: + // i += 1 + INCB AX + + // j += c.s[i] + MOVBLZX (BP)(AX*4), DX + ADDB DX, BX + MOVBLZX BX, BX + + // c.s[i], c.s[j] = c.s[j], c.s[i] + MOVBLZX (BP)(BX*4), CX + MOVB CX, (BP)(AX*4) + MOVB DX, (BP)(BX*4) + + // *dst = *src ^ c.s[c.s[i]+c.s[j]] + ADDB DX, CX + MOVBLZX CX, CX + MOVB (BP)(CX*4), CX + XORB (SI), CX + MOVBLZX CX, CX + MOVB CX, (DI) + + INCL SI + INCL DI + DECL n+8(FP) + JNE loop + +done: + MOVL i+16(FP), CX + MOVB AX, (CX) + MOVL j+20(FP), CX + MOVB BX, (CX) + + RET |