diff options
Diffstat (limited to 'crypto/j2me/org/bouncycastle/tsp/TSPUtil.java')
| -rw-r--r-- | crypto/j2me/org/bouncycastle/tsp/TSPUtil.java | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/crypto/j2me/org/bouncycastle/tsp/TSPUtil.java b/crypto/j2me/org/bouncycastle/tsp/TSPUtil.java new file mode 100644 index 000000000..daa51cdbb --- /dev/null +++ b/crypto/j2me/org/bouncycastle/tsp/TSPUtil.java @@ -0,0 +1,233 @@ +package org.bouncycastle.tsp; + +import java.io.ByteArrayInputStream; +import java.io.IOException; +import java.io.OutputStream; + +import java.util.ArrayList; +import java.util.Collection; +import java.util.Collections; +import java.util.HashMap; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Set; + +import org.bouncycastle.asn1.ASN1Encodable; +import org.bouncycastle.asn1.ASN1EncodableVector; +import org.bouncycastle.asn1.ASN1InputStream; +import org.bouncycastle.asn1.ASN1ObjectIdentifier; +import org.bouncycastle.asn1.ASN1OctetString; +import org.bouncycastle.asn1.ASN1Set; +import org.bouncycastle.asn1.cms.Attribute; +import org.bouncycastle.asn1.cms.AttributeTable; +import org.bouncycastle.asn1.cms.ContentInfo; +import org.bouncycastle.asn1.cryptopro.CryptoProObjectIdentifiers; +import org.bouncycastle.asn1.nist.NISTObjectIdentifiers; +import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers; +import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers; +import org.bouncycastle.asn1.teletrust.TeleTrusTObjectIdentifiers; +import org.bouncycastle.asn1.x509.ExtendedKeyUsage; +import org.bouncycastle.asn1.x509.Extension; +import org.bouncycastle.asn1.x509.Extensions; +import org.bouncycastle.asn1.x509.ExtensionsGenerator; +import org.bouncycastle.asn1.x509.KeyPurposeId; +import org.bouncycastle.asn1.x509.X509Extensions; +import org.bouncycastle.cert.X509CertificateHolder; +import org.bouncycastle.cms.SignerInformation; +import org.bouncycastle.operator.DigestCalculator; +import org.bouncycastle.operator.DigestCalculatorProvider; +import org.bouncycastle.operator.OperatorCreationException; +import org.bouncycastle.util.Arrays; + +public class TSPUtil +{ + private static Set EMPTY_SET = Collections.unmodifiableSet(new HashSet()); + private static List EMPTY_LIST = Collections.unmodifiableList(new ArrayList()); + + private static final Map digestLengths = new HashMap(); + private static final Map digestNames = new HashMap(); + + static + { + digestLengths.put(PKCSObjectIdentifiers.md5.getId(), new Integer(16)); + digestLengths.put(OIWObjectIdentifiers.idSHA1.getId(), new Integer(20)); + digestLengths.put(NISTObjectIdentifiers.id_sha224.getId(), new Integer(28)); + digestLengths.put(NISTObjectIdentifiers.id_sha256.getId(), new Integer(32)); + digestLengths.put(NISTObjectIdentifiers.id_sha384.getId(), new Integer(48)); + digestLengths.put(NISTObjectIdentifiers.id_sha512.getId(), new Integer(64)); + digestLengths.put(TeleTrusTObjectIdentifiers.ripemd128.getId(), new Integer(16)); + digestLengths.put(TeleTrusTObjectIdentifiers.ripemd160.getId(), new Integer(20)); + digestLengths.put(TeleTrusTObjectIdentifiers.ripemd256.getId(), new Integer(32)); + digestLengths.put(CryptoProObjectIdentifiers.gostR3411.getId(), new Integer(32)); + + digestNames.put(PKCSObjectIdentifiers.md5.getId(), "MD5"); + digestNames.put(OIWObjectIdentifiers.idSHA1.getId(), "SHA1"); + digestNames.put(NISTObjectIdentifiers.id_sha224.getId(), "SHA224"); + digestNames.put(NISTObjectIdentifiers.id_sha256.getId(), "SHA256"); + digestNames.put(NISTObjectIdentifiers.id_sha384.getId(), "SHA384"); + digestNames.put(NISTObjectIdentifiers.id_sha512.getId(), "SHA512"); + digestNames.put(PKCSObjectIdentifiers.sha1WithRSAEncryption.getId(), "SHA1"); + digestNames.put(PKCSObjectIdentifiers.sha224WithRSAEncryption.getId(), "SHA224"); + digestNames.put(PKCSObjectIdentifiers.sha256WithRSAEncryption.getId(), "SHA256"); + digestNames.put(PKCSObjectIdentifiers.sha384WithRSAEncryption.getId(), "SHA384"); + digestNames.put(PKCSObjectIdentifiers.sha512WithRSAEncryption.getId(), "SHA512"); + digestNames.put(TeleTrusTObjectIdentifiers.ripemd128.getId(), "RIPEMD128"); + digestNames.put(TeleTrusTObjectIdentifiers.ripemd160.getId(), "RIPEMD160"); + digestNames.put(TeleTrusTObjectIdentifiers.ripemd256.getId(), "RIPEMD256"); + digestNames.put(CryptoProObjectIdentifiers.gostR3411.getId(), "GOST3411"); + } + + /** + * Fetches the signature time-stamp attributes from a SignerInformation object. + * Checks that the MessageImprint for each time-stamp matches the signature field. + * (see RFC 3161 Appendix A). + * + * @param signerInfo a SignerInformation to search for time-stamps + * @param digCalcProvider provider for digest calculators + * @return a collection of TimeStampToken objects + * @throws TSPValidationException + */ + public static Collection getSignatureTimestamps(SignerInformation signerInfo, DigestCalculatorProvider digCalcProvider) + throws TSPValidationException + { + List timestamps = new ArrayList(); + + AttributeTable unsignedAttrs = signerInfo.getUnsignedAttributes(); + if (unsignedAttrs != null) + { + ASN1EncodableVector allTSAttrs = unsignedAttrs.getAll( + PKCSObjectIdentifiers.id_aa_signatureTimeStampToken); + for (int i = 0; i < allTSAttrs.size(); ++i) + { + Attribute tsAttr = (Attribute)allTSAttrs.get(i); + ASN1Set tsAttrValues = tsAttr.getAttrValues(); + for (int j = 0; j < tsAttrValues.size(); ++j) + { + try + { + ContentInfo contentInfo = ContentInfo.getInstance(tsAttrValues.getObjectAt(j)); + TimeStampToken timeStampToken = new TimeStampToken(contentInfo); + TimeStampTokenInfo tstInfo = timeStampToken.getTimeStampInfo(); + + DigestCalculator digCalc = digCalcProvider.get(tstInfo.getHashAlgorithm()); + + OutputStream dOut = digCalc.getOutputStream(); + + dOut.write(signerInfo.getSignature()); + dOut.close(); + + byte[] expectedDigest = digCalc.getDigest(); + + if (!Arrays.constantTimeAreEqual(expectedDigest, tstInfo.getMessageImprintDigest())) + { + throw new TSPValidationException("Incorrect digest in message imprint"); + } + + timestamps.add(timeStampToken); + } + catch (OperatorCreationException e) + { + throw new TSPValidationException("Unknown hash algorithm specified in timestamp"); + } + catch (Exception e) + { + throw new TSPValidationException("Timestamp could not be parsed"); + } + } + } + } + + return timestamps; + } + + /** + * Validate the passed in certificate as being of the correct type to be used + * for time stamping. To be valid it must have an ExtendedKeyUsage extension + * which has a key purpose identifier of id-kp-timeStamping. + * + * @param cert the certificate of interest. + * @throws TSPValidationException if the certicate fails on one of the check points. + */ + public static void validateCertificate( + X509CertificateHolder cert) + throws TSPValidationException + { + if (cert.toASN1Structure().getVersionNumber() != 3) + { + throw new IllegalArgumentException("Certificate must have an ExtendedKeyUsage extension."); + } + + Extension ext = cert.getExtension(Extension.extendedKeyUsage); + if (ext == null) + { + throw new TSPValidationException("Certificate must have an ExtendedKeyUsage extension."); + } + + if (!ext.isCritical()) + { + throw new TSPValidationException("Certificate must have an ExtendedKeyUsage extension marked as critical."); + } + + ExtendedKeyUsage extKey = ExtendedKeyUsage.getInstance(ext.getParsedValue()); + + if (!extKey.hasKeyPurposeId(KeyPurposeId.id_kp_timeStamping) || extKey.size() != 1) + { + throw new TSPValidationException("ExtendedKeyUsage not solely time stamping."); + } + } + + /* + * Return the digest algorithm using one of the standard JCA string + * representations rather than the algorithm identifier (if possible). + */ + static String getDigestAlgName( + String digestAlgOID) + { + String digestName = (String)digestNames.get(digestAlgOID); + + if (digestName != null) + { + return digestName; + } + + return digestAlgOID; + } + + static int getDigestLength( + String digestAlgOID) + throws TSPException + { + Integer length = (Integer)digestLengths.get(digestAlgOID); + + if (length != null) + { + return length.intValue(); + } + + throw new TSPException("digest algorithm cannot be found."); + } + + static List getExtensionOIDs(Extensions extensions) + { + if (extensions == null) + { + return EMPTY_LIST; + } + + return Collections.unmodifiableList(java.util.Arrays.asList(extensions.getExtensionOIDs())); + } + + static void addExtension(ExtensionsGenerator extGenerator, ASN1ObjectIdentifier oid, boolean isCritical, ASN1Encodable value) + throws TSPIOException + { + try + { + extGenerator.addExtension(oid, isCritical, value); + } + catch (IOException e) + { + throw new TSPIOException("cannot encode extension: " + e.getMessage(), e); + } + } +} |