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JCL-385: Improve PKCE verifier to always produce spec conforming values by acoburn · Pull Request #517 · inrupt/solid-client-java · GitHub

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JCL-385: Improve PKCE verifier to always produce spec conforming values #517

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Merged
acoburn merged 1 commit into from
Jun 9, 2023
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JCL-385: Improve PKCE verifier to always produce spec conforming values #517

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      • PKCE.java
      • PKCETest.java
4 changes: 3 additions & 1 deletion openid/src/main/java/com/inrupt/client/openid/PKCE.java
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,8 @@
*/
public final class PKCE {

private static final BigInteger PADDING = BigInteger.valueOf(2).pow(256);

/**
* Create a PKCE challenge value using the S256 algorithm.
*
Expand Down Expand Up @@ -73,7 +75,7 @@ static String createChallenge(final String verifier, final String alg) {
* @return the Base64URL-encoded verifier
*/
static String createVerifier() {
final byte[] rand = new BigInteger(32 * 8, new SecureRandom()).toByteArray();
final byte[] rand = PADDING.add(new BigInteger(32 * 8, new SecureRandom())).toByteArray();
return Base64.getUrlEncoder().withoutPadding().encodeToString(rand);
}

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13 changes: 6 additions & 7 deletions openid/src/test/java/com/inrupt/client/openid/PKCETest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,6 @@
*/
package com.inrupt.client.openid;

import static java.nio.charset.StandardCharsets.UTF_8;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;

Expand All @@ -30,16 +29,16 @@ class PKCETest {

@Test
void createChallengeTest() {
assertTrue(PKCE.createChallenge("🐶🐶🐶", "SHA-256").getBytes(UTF_8).length >= 43);
assertTrue(PKCE.createChallenge("🐶🐶🐶", "SHA-256").getBytes(UTF_8).length <= 128);
assertTrue(PKCE.createChallenge("", "SHA-256").getBytes(UTF_8).length >= 43);
assertTrue(PKCE.createChallenge("", "SHA-256").getBytes(UTF_8).length <= 128);
assertTrue(PKCE.createChallenge("🐶🐶🐶", "SHA-256").length() >= 43);
Comment on lines -36 to +32

NSeydoux Jun 9, 2023

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

For my own understanding, was the .getBytes(UTF_8) useful in the first place?

acoburn Jun 9, 2023

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

No, the getBytes test was unnecessary. The spec requires checking the character length of the resulting string, not the size of the byte array. Admittedly, for ASCII strings, the two will be equivalent, but it is unnecessary
assertTrue(PKCE.createChallenge("🐶🐶🐶", "SHA-256").length() <= 128);
assertTrue(PKCE.createChallenge("", "SHA-256").length() >= 43);
assertTrue(PKCE.createChallenge("", "SHA-256").length() <= 128);
assertThrows(NullPointerException.class, () -> PKCE.createChallenge(null, "SHA-256"));
}

@Test
void createVerifierTest() {
assertTrue(PKCE.createVerifier().getBytes(UTF_8).length >= 43);
assertTrue(PKCE.createVerifier().getBytes(UTF_8).length <= 128);
assertTrue(PKCE.createVerifier().length() >= 43);
assertTrue(PKCE.createVerifier().length() <= 128);
}
}
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