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22 lines
426 B
C
22 lines
426 B
C
/* Copyright (C) radare2 - 2016 - moritz */
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#include <r_types.h>
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#include <r_util.h>
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R_API ut64 r_hash_luhn(const ut8 *buf, ut64 len) {
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int i, curDigit, parity = (len - 1) % 2;
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ut64 sum = 0;
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char curChar[2] = "\0";
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for (i = len; i > 0 ; i--) {
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curChar[0] = buf[i - 1];
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curDigit = atoi (curChar);
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if (parity == i % 2) {
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curDigit *= 2;
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}
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sum += curDigit / 10;
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sum += curDigit % 10;
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}
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return sum % 10;
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}
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