stan/jdk-24
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

7167656: Multiple Seeders are being created

Browse Source 
Reviewed-by: smarks, mduigou, ahgross
This commit is contained in:
Bradford Wetmore 2012-05-21 15:42:15 -07:00
parent 1e5b3e3ded
commit 3b10a3f9b8
1 changed files with 23 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
jdk/src/share/classes/sun/security/provider/SecureRandom.java
View File

@ -56,12 +56,6 @@ implements java.io.Serializable {
private static final long serialVersionUID = 3581829991155417889L;
/**
* This static object will be seeded by SeedGenerator, and used
* to seed future instances of SecureRandom
*/
private static SecureRandom seeder;
private static final int DIGEST_SIZE = 20;
private transient MessageDigest digest;
private byte[] state;
@ -172,6 +166,28 @@ implements java.io.Serializable {
state[0]++;
}
/**
* This static object will be seeded by SeedGenerator, and used
* to seed future instances of SHA1PRNG SecureRandoms.
*
* Bloch, Effective Java Second Edition: Item 71
*/
private static class SeederHolder {
private static final SecureRandom seeder;
static {
/*
* Call to SeedGenerator.generateSeed() to add additional
* seed material (likely from the Native implementation).
*/
seeder = new SecureRandom(SeedGenerator.getSystemEntropy());
byte [] b = new byte[DIGEST_SIZE];
SeedGenerator.generateSeed(b);
seeder.engineSetSeed(b);
}
}
/**
* Generates a user-specified number of random bytes.
*
@ -183,13 +199,8 @@ implements java.io.Serializable {
byte[] output = remainder;
if (state == null) {
if (seeder == null) {
seeder = new SecureRandom(SeedGenerator.getSystemEntropy());
seeder.engineSetSeed(engineGenerateSeed(DIGEST_SIZE));
}
byte[] seed = new byte[DIGEST_SIZE];
seeder.engineNextBytes(seed);
SeederHolder.seeder.engineNextBytes(seed);
state = digest.digest(seed);
}