/**
* Reads in a PKCS7 object. This returns a ContentInfo object suitable for use with the CMS API.
*
* @return the X509Certificate
* @throws IOException if an I/O error occured
*/
private ContentInfo readPKCS7(String endMarker) throws IOException {
String line;
StringBuffer buf = new StringBuffer();
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
while ((line = readLine()) != null) {
if (line.indexOf(endMarker) != -1) {
break;
}
line = line.trim();
buf.append(line.trim());
Base64.decode(buf.substring(0, (buf.length() / 4) * 4), bOut);
buf.delete(0, (buf.length() / 4) * 4);
}
if (buf.length() != 0) {
throw new IOException("base64 data appears to be truncated");
}
if (line == null) {
throw new IOException(endMarker + " not found");
}
try {
ASN1InputStream aIn = new ASN1InputStream(bOut.toByteArray());
return ContentInfo.getInstance(aIn.readObject());
} catch (Exception e) {
throw new PEMException("problem parsing PKCS7 object: " + e.toString(), e);
}
}
private byte[] readBytes(String endMarker) throws IOException {
String line;
StringBuffer buf = new StringBuffer();
while ((line = readLine()) != null) {
if (line.indexOf(endMarker) != -1) {
break;
}
buf.append(line.trim());
}
if (line == null) {
throw new IOException(endMarker + " not found");
}
return Base64.decode(buf.toString());
}
/** Read a Key Pair */
private KeyPair readKeyPair(String type, String endMarker) throws Exception {
boolean isEncrypted = false;
String line = null;
String dekInfo = null;
StringBuffer buf = new StringBuffer();
while ((line = readLine()) != null) {
if (line.startsWith("Proc-Type: 4,ENCRYPTED")) {
isEncrypted = true;
} else if (line.startsWith("DEK-Info:")) {
dekInfo = line.substring(10);
} else if (line.indexOf(endMarker) != -1) {
break;
} else {
buf.append(line.trim());
}
}
//
// extract the key
//
byte[] keyBytes = Base64.decode(buf.toString());
if (isEncrypted) {
if (pFinder == null) {
throw new PasswordException("No password finder specified, but a password is required");
}
char[] password = pFinder.getPassword();
if (password == null) {
throw new PasswordException("Password is null, but a password is required");
}
StringTokenizer tknz = new StringTokenizer(dekInfo, ",");
String dekAlgName = tknz.nextToken();
byte[] iv = Hex.decode(tknz.nextToken());
keyBytes = PEMUtilities.crypt(false, provider, keyBytes, password, dekAlgName, iv);
}
KeySpec pubSpec, privSpec;
ASN1Sequence seq = (ASN1Sequence) ASN1Object.fromByteArray(keyBytes);
if (type.equals("RSA")) {
// DERInteger v = (DERInteger)seq.getObjectAt(0);
DERInteger mod = (DERInteger) seq.getObjectAt(1);
DERInteger pubExp = (DERInteger) seq.getObjectAt(2);
DERInteger privExp = (DERInteger) seq.getObjectAt(3);
DERInteger p1 = (DERInteger) seq.getObjectAt(4);
DERInteger p2 = (DERInteger) seq.getObjectAt(5);
DERInteger exp1 = (DERInteger) seq.getObjectAt(6);
DERInteger exp2 = (DERInteger) seq.getObjectAt(7);
DERInteger crtCoef = (DERInteger) seq.getObjectAt(8);
pubSpec = new RSAPublicKeySpec(mod.getValue(), pubExp.getValue());
privSpec =
new RSAPrivateCrtKeySpec(
mod.getValue(),
pubExp.getValue(),
privExp.getValue(),
p1.getValue(),
p2.getValue(),
exp1.getValue(),
exp2.getValue(),
crtCoef.getValue());
} else if (type.equals("ECDSA")) {
ECPrivateKeyStructure pKey = new ECPrivateKeyStructure(seq);
AlgorithmIdentifier algId =
new AlgorithmIdentifier(X9ObjectIdentifiers.id_ecPublicKey, pKey.getParameters());
PrivateKeyInfo privInfo = new PrivateKeyInfo(algId, pKey.getDERObject());
SubjectPublicKeyInfo pubInfo =
new SubjectPublicKeyInfo(algId, pKey.getPublicKey().getBytes());
privSpec = new PKCS8EncodedKeySpec(privInfo.getEncoded());
pubSpec = new X509EncodedKeySpec(pubInfo.getEncoded());
} else // "DSA"
{
// DERInteger v = (DERInteger)seq.getObjectAt(0);
DERInteger p = (DERInteger) seq.getObjectAt(1);
DERInteger q = (DERInteger) seq.getObjectAt(2);
DERInteger g = (DERInteger) seq.getObjectAt(3);
DERInteger y = (DERInteger) seq.getObjectAt(4);
DERInteger x = (DERInteger) seq.getObjectAt(5);
privSpec = new DSAPrivateKeySpec(x.getValue(), p.getValue(), q.getValue(), g.getValue());
pubSpec = new DSAPublicKeySpec(y.getValue(), p.getValue(), q.getValue(), g.getValue());
}
KeyFactory fact = KeyFactory.getInstance(type, provider);
return new KeyPair(fact.generatePublic(pubSpec), fact.generatePrivate(privSpec));
}