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Add some logging to LinuxSecureRandom.

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This commit is contained in:
Andreas Schildbach 2014-12-10 16:10:27 +01:00
parent 5aaf6a25db
commit 4499e0f7c1
1 changed files with 13 additions and 1 deletions
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14
core/src/main/java/org/bitcoinj/crypto/LinuxSecureRandom.java
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@ -25,6 +25,9 @@ import java.security.Provider;
import java.security.SecureRandomSpi;
import java.security.Security;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A SecureRandom implementation that is able to override the standard JVM provided implementation, and which simply
* serves random numbers by reading /dev/urandom. That is, it delegates to the kernel on UNIX systems and is unusable on
@ -41,6 +44,8 @@ public class LinuxSecureRandom extends SecureRandomSpi {
}
}
private static final Logger log = LoggerFactory.getLogger(LinuxSecureRandom.class);
static {
try {
File file = new File("/dev/urandom");
@ -48,9 +53,16 @@ public class LinuxSecureRandom extends SecureRandomSpi {
// This stream is deliberately leaked.
urandom = new FileInputStream(file);
// Now override the default SecureRandom implementation with this one.
Security.insertProviderAt(new LinuxSecureRandomProvider(), 1);
int position = Security.insertProviderAt(new LinuxSecureRandomProvider(), 1);
if (position != -1)
log.info("Secure randomness will be read from {} only.", file);
else
log.info("Randomness is already secure.");
} else {
urandom = null;
log.info("Does not exist: {}", file);
}
} catch (FileNotFoundException e) {
// Should never happen.