Kaladaran/briar
0
0
Fork 0
mirror of https://code.briarproject.org/briar/briar.git synced 2026-02-17 05:09:53 +01:00
Code Issues Projects Releases Wiki Activity

Restored accidentally deleted javadoc.

Browse Source
This commit is contained in:
akwizgran
2015-12-31 17:46:18 +00:00
parent 90af176810
commit 7c1ee9ce87
1 changed files with 9 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
briar-core/src/org/briarproject/crypto/DoubleDigest.java
View File

@@ -3,6 +3,15 @@ package org.briarproject.crypto;
import org.briarproject.api.crypto.MessageDigest; import org.briarproject.api.crypto.MessageDigest;
import org.spongycastle.crypto.Digest; import org.spongycastle.crypto.Digest;
/**
* A message digest that prevents length extension attacks - see Ferguson and
* Schneier, <i>Practical Cryptography</i>, chapter 6.
* <p>
* "Let h be an interative hash function. The hash function h<sub>d</sub> is
* defined by h<sub>d</sub> := h(h(m)), and has a claimed security level of
* min(k, n/2) where k is the security level of h and n is the size of the hash
* result."
*/
class DoubleDigest implements MessageDigest { class DoubleDigest implements MessageDigest {
private final Digest delegate; private final Digest delegate;