shu/kry-ctr-spn
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fix k function

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This commit is contained in:
Sebastian Hugentobler 2022-03-17 12:46:28 +01:00
parent 2a35bbbfab
commit 51a4b2d9bc
2 changed files with 5 additions and 2 deletions
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1
.idea/gradle.xml
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@ -1,5 +1,6 @@
<?xml version="1.0" encoding="UTF-8"?> <?xml version="1.0" encoding="UTF-8"?>
<project version="4"> <project version="4">
<component name="GradleMigrationSettings" migrationVersion="1" />
<component name="GradleSettings"> <component name="GradleSettings">
<option name="linkedExternalProjectsSettings"> <option name="linkedExternalProjectsSettings">
<GradleProjectSettings> <GradleProjectSettings>

6
src/main/java/ch/fhnw/kry/SPN.java
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@ -1,10 +1,12 @@
package ch.fhnw.kry; package ch.fhnw.kry;
public class SPN { public class SPN {
private final static int ROUND_KEY_LENGTH = 16;
public int k(int key, int i) { public int k(int key, int i) {
i *= 4; i *= 4;
int mask = 0xFFFF >>> i; int mask = 0xFFFF_0000 >>> i;
return key & mask; return key & mask >>> ROUND_KEY_LENGTH - i;
} }
} }