public static MD5InputStreamResult generateMD5Result(InputStream toEncode) {
MD5Digest eTag = new MD5Digest();
byte[] resBuf = new byte[eTag.getDigestSize()];
byte[] buffer = new byte[1024];
ByteArrayOutputStream out = new ByteArrayOutputStream();
long length = 0;
int numRead = -1;
try {
do {
numRead = toEncode.read(buffer);
if (numRead > 0) {
length += numRead;
eTag.update(buffer, 0, numRead);
out.write(buffer, 0, numRead);
}
} while (numRead != -1);
} catch (IOException e) {
throw new RuntimeException(e);
} finally {
IOUtils.closeQuietly(out);
IOUtils.closeQuietly(toEncode);
}
eTag.doFinal(resBuf, 0);
return new MD5InputStreamResult(out.toByteArray(), resBuf, length);
}
public static byte[] md5(byte[] plainBytes) {
MD5Digest eTag = new MD5Digest();
byte[] resBuf = new byte[eTag.getDigestSize()];
eTag.update(plainBytes, 0, plainBytes.length);
eTag.doFinal(resBuf, 0);
return resBuf;
}
public synchronized String generateSignature(byte[] message) throws Exception {
// Log.trace("Signed message length is " + message.length);
try {
digest.reset();
cipher.init(true, privateRsaKey);
digest.update(message, 0, message.length);
byte[] hash = new byte[digest.getDigestSize()];
digest.doFinal(hash, 0);
DigestInfo info = new DigestInfo(new AlgorithmIdentifier(md5, null), hash);
byte[] bytes = info.getEncoded(ASN1Encoding.DER);
byte[] signature = cipher.processBlock(bytes, 0, bytes.length);
return new String(org.bouncycastle.util.encoders.Base64.encode(signature));
} catch (Exception e) {
throw new Exception("Ошибка создания подписи:\n" + e.getMessage());
}
}
public synchronized void verifySignature(byte[] message, byte[] signature) throws Exception {
try {
digest.reset();
cipher.init(false, publicRsaKey);
digest.update(message, 0, message.length);
byte[] hash = new byte[digest.getDigestSize()];
digest.doFinal(hash, 0);
DigestInfo info = new DigestInfo(new AlgorithmIdentifier(md5, null), hash);
byte[] bytes = info.getEncoded(ASN1Encoding.DER);
byte[] signatureData = org.bouncycastle.util.encoders.Base64.decode(signature);
byte[] result = cipher.processBlock(signatureData, 0, signatureData.length);
if ((result == null) || (result.length < hash.length)) {
throw new Exception("Invalid signature (1)!");
}
if (!compareFromTheEnd(hash, result)) {
throw new Exception("Invalid signature (2)!");
}
} catch (Exception e) {
throw new Exception("Error checking signature:\n" + e.getMessage());
}
}
public static byte[] md5(File toEncode) {
MD5Digest eTag = new MD5Digest();
byte[] resBuf = new byte[eTag.getDigestSize()];
byte[] buffer = new byte[1024];
int numRead = -1;
InputStream i = null;
try {
i = new FileInputStream(toEncode);
do {
numRead = i.read(buffer);
if (numRead > 0) {
eTag.update(buffer, 0, numRead);
}
} while (numRead != -1);
} catch (IOException e) {
throw new RuntimeException(e);
} finally {
IOUtils.closeQuietly(i);
}
eTag.doFinal(resBuf, 0);
return resBuf;
}