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SEC-2521: Improve StandardPasswordEncoder performance

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This commit is contained in:
Rob Winch 2015-10-27 11:20:24 -05:00
parent 9c39a0e83e
commit d648a56e16
1 changed files with 17 additions and 14 deletions
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31
crypto/src/main/java/org/springframework/security/crypto/password/Digester.java
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@ -17,7 +17,6 @@ package org.springframework.security.crypto.password;
import java.security.MessageDigest; import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException; import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
/** /**
* Helper for working with the MessageDigest API. * Helper for working with the MessageDigest API.
@ -30,7 +29,7 @@ import java.security.NoSuchProviderException;
*/ */
final class Digester { final class Digester {
private final MessageDigest messageDigest; private final String algorithm;
private final int iterations; private final int iterations;
@ -40,22 +39,26 @@ final class Digester {
* @param iterations the number of times to apply the digest algorithm to the input * @param iterations the number of times to apply the digest algorithm to the input
*/ */
public Digester(String algorithm, int iterations) { public Digester(String algorithm, int iterations) {
try { // eagerly validate the algorithm
messageDigest = MessageDigest.getInstance(algorithm); createDigest(algorithm);
} this.algorithm = algorithm;
catch (NoSuchAlgorithmException e) {
throw new IllegalStateException("No such hashing algorithm", e);
}
this.iterations = iterations; this.iterations = iterations;
} }
public byte[] digest(byte[] value) { public byte[] digest(byte[] value) {
synchronized (messageDigest) { MessageDigest messageDigest = createDigest(algorithm);
for (int i = 0; i < iterations; i++) { for (int i = 0; i < iterations; i++) {
value = messageDigest.digest(value); value = messageDigest.digest(value);
} }
return value; return value;
}
private static MessageDigest createDigest(String algorithm) {
try {
return MessageDigest.getInstance(algorithm);
}
catch (NoSuchAlgorithmException e) {
throw new IllegalStateException("No such hashing algorithm", e);
} }
} }
} }