82e7917294
* Added authors and licenses and plugin access to crypto related files * removed `rz_hash` and related files * introduced `rz_msg_digest_*` with plugins * updated all old methods with newer ones. * added HMAC support to `rz-hash` (moved key option under `-K`) * removed wrong algorithms on `woD`/`woE` * fixed parity digest size * fixed the behaviour on all hash functions * added unit test for hash * optimized code for HMAC key calculation * removed hash legacy tests
32 lines
625 B
C
32 lines
625 B
C
// SPDX-FileCopyrightText: 2021 deroad <wargio@libero.it>
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// SPDX-License-Identifier: LGPL-3.0-only
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#include <rz_util.h>
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RZ_API bool rz_calculate_luhn_value(const char *data, ut64 *result) {
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rz_return_val_if_fail(data && result, false);
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ssize_t size = strlen(data);
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if (size < 1) {
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return false;
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}
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int digit;
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ut64 sum = 0;
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bool parity = false;
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for (ssize_t i = size - 1; i >= 0; --i) {
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if (!IS_DIGIT(data[i])) {
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return false;
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}
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digit = data[i] - '0';
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if (parity) {
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digit *= 2;
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}
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digit = (digit / 10) + (digit % 10);
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sum += digit;
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parity = !parity;
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}
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*result = sum % 10;
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return true;
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}
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