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https://issues.apache.org/jira/browse/DIRKRB-220?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kai Zheng updated DIRKRB-220:
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Summary: Fix random2Key function in Des3KeyMaker (was: Fix random2Key
function in Des3KeyMaker.java)
> Fix random2Key function in Des3KeyMaker
> ---------------------------------------
>
> Key: DIRKRB-220
> URL: https://issues.apache.org/jira/browse/DIRKRB-220
> Project: Directory Kerberos
> Issue Type: Bug
> Reporter: Xu Yaning
> Attachments: DIRKRB-220-v1.patch, DIRKRB-220-v2.patch
>
>
> There is a problem in random2Key function that it dosen't calculate the 8th
> byte for every 7 bytes.
> {code}
> byte[] key = new byte[encProvider().keySize()];
> byte[] tmp1 = new byte[7];
> byte[] tmp2;
> for (int i = 0; i < 3; i++) {
> System.arraycopy(randomBits, i * 7, key, i * 8, 7);
> System.arraycopy(randomBits, i * 7, tmp1, 0, 7);
> tmp2 = getEightBits(tmp1);
> key[8 * (i + 1) - 1] = tmp2[7];
> int nthByte = i * 8;
> key[nthByte + 7] = (byte) (((key[nthByte + 0] & 1) << 1) |
> ((key[nthByte + 1] & 1) << 2) |
> ((key[nthByte + 2] & 1) << 3) |
> ((key[nthByte + 3] & 1) << 4) |
> ((key[nthByte + 4] & 1) << 5) |
> ((key[nthByte + 5] & 1) << 6) |
> ((key[nthByte + 6] & 1) << 7));
> for (int j = 0; j < 8; j++) {
> int tmp = key[nthByte + j] & 0xfe;
> tmp |= (Integer.bitCount(tmp) & 1) ^ 1;
> key[nthByte + j] = (byte) tmp;
> }
> }
> {code}
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