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35 lines
1.1 KiB
C
35 lines
1.1 KiB
C
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/*
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* XOR two pieces of memory, copying the result into a third, which
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* may precisely alias one of the input pair (but no guarantees if it
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* partially overlaps).
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*/
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#include "defs.h"
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#include "misc.h"
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void memxor(uint8_t *out, const uint8_t *in1, const uint8_t *in2, size_t size)
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{
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switch (size & 15) {
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case 0:
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while (size >= 16) {
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size -= 16;
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*out++ = *in1++ ^ *in2++;
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case 15: *out++ = *in1++ ^ *in2++;
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case 14: *out++ = *in1++ ^ *in2++;
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case 13: *out++ = *in1++ ^ *in2++;
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case 12: *out++ = *in1++ ^ *in2++;
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case 11: *out++ = *in1++ ^ *in2++;
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case 10: *out++ = *in1++ ^ *in2++;
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case 9: *out++ = *in1++ ^ *in2++;
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case 8: *out++ = *in1++ ^ *in2++;
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case 7: *out++ = *in1++ ^ *in2++;
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case 6: *out++ = *in1++ ^ *in2++;
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case 5: *out++ = *in1++ ^ *in2++;
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case 4: *out++ = *in1++ ^ *in2++;
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case 3: *out++ = *in1++ ^ *in2++;
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case 2: *out++ = *in1++ ^ *in2++;
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case 1: *out++ = *in1++ ^ *in2++;
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}
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}
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}
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