尝试从证书中获取签名时格式错误的内容异常
may*_*ran 1 java security bouncycastle sign certificate
我编写了以下代码,以使用证书库中的证书验证文件的签名.但是,当我尝试获取其签名并将其传递给SignedData方法时,我得到以下异常.
org.bouncycastle.cms.CMSException: Malformed content.
at org.bouncycastle.cms.CMSUtils.readContentInfo(Unknown Source)
at org.bouncycastle.cms.CMSUtils.readContentInfo(Unknown Source)
at org.bouncycastle.cms.CMSSignedData.<init>(Unknown Source)
at VerifyFinal.main(VerifyFinal.java:65)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
Caused by: java.lang.IllegalArgumentException: unknown object in getInstance: org.bouncycastle.asn1.DERApplicationSpecific
at org.bouncycastle.asn1.ASN1Sequence.getInstance(Unknown Source)
at org.bouncycastle.asn1.cms.ContentInfo.getInstance(Unknown Source)
... 9 more
下面是我用来验证文件签名的代码.
Security.addProvider(new BouncyCastleProvider());
KeyStore msCertStore = KeyStore.getInstance("Windows-MY", "SunMSCAPI");
msCertStore.load(null, null);
X509Certificate cer = ((X509Certificate) msCertStore.getCertificate("Software View Certificate Authority"));
PublicKey pubKey = cer.getPublicKey();
byte[] sigToVerify = cer.getSignature();
Signature signature = Signature.getInstance("SHA1WithRSA", "BC");
signature.initVerify(pubKey);
CMSSignedData cms = new CMSSignedData(cer.getSignature());
Store store = cms.getCertificates();
SignerInformationStore signers = cms.getSignerInfos();
Collection c = signers.getSigners();
Iterator it = c.iterator();
while (it.hasNext()) {
SignerInformation signer = (SignerInformation) it.next();
Collection certCollection = store.getMatches(signer.getSID());
Iterator certIt = certCollection.iterator();
X509CertificateHolder certHolder = (X509CertificateHolder) certIt.next();
X509Certificate cert = new JcaX509CertificateConverter().setProvider("BC").getCertificate(certHolder);
if (signer.verify(new JcaSimpleSignerInfoVerifierBuilder().setProvider("BC").build(cert))) {
System.out.println("verified");
}
}
} catch (Exception ex) {
ex.printStackTrace();
}
如果您需要,下面是我签署文件的方式.
File file = new File("G:\\Projects\\test.zip");
fin = new FileInputStream(file);
byte fileContent[] = new byte[(int) file.length()];
Security.addProvider(new BouncyCastleProvider());
KeyStore ks = KeyStore.getInstance(KEYSTORE_INSTANCE);
ks.load(new FileInputStream(KEYSTORE_FILE), KEYSTORE_PWD.toCharArray());
Key key = ks.getKey(KEYSTORE_ALIAS, KEYSTORE_PWD.toCharArray());
//Sign
PrivateKey privKey = (PrivateKey) key;
Signature signature = Signature.getInstance("SHA1WithRSA", "BC");
signature.initSign(privKey);
signature.update(fileContent);
//Build CMS
X509Certificate cert = (X509Certificate) ks.getCertificate(KEYSTORE_ALIAS);
List certList = new ArrayList();
CMSTypedData msg = new CMSProcessableByteArray(signature.sign());
certList.add(cert);
Store certs = new JcaCertStore(certList);
CMSSignedDataGenerator gen = new CMSSignedDataGenerator();
ContentSigner sha1Signer = new JcaContentSignerBuilder("SHA1withRSA").setProvider("BC").build(privKey);
gen.addSignerInfoGenerator(new JcaSignerInfoGeneratorBuilder(new JcaDigestCalculatorProviderBuilder().setProvider("BC").build()).build(sha1Signer, cert));
gen.addCertificates(certs);
CMSSignedData sigData = gen.generate(msg, true);
BASE64Encoder encoder = new BASE64Encoder();
String signedContent = encoder.encode((byte[]) sigData.getSignedContent().getContent());
System.out.println("Signed content: " + signedContent + "\n");
String envelopedData = encoder.encode(sigData.getEncoded());
System.out.println("Enveloped data: " + envelopedData);
在对VOLKERK的评论之后:
我如何生成签名+数据文件:
public static void main(String[] args) throws Exception {
// String text = "This is a message";
// File file = new
// File("C:\\Users\\mayooranM\\Desktop\\SignatureVerificationTest\\ProcessExplorer.zip");
// fin = new FileInputStream(file);
// byte fileContent[] = new byte[(int) file.length()];
Path filepath = Paths.get("G:\\IntelliJTestProjects\\googleplaces.zip");
byte[] fileContent = Files.readAllBytes(filepath);
Security.addProvider(new BouncyCastleProvider());
KeyStore ks = KeyStore.getInstance(KEYSTORE_INSTANCE);
ks.load(new FileInputStream(KEYSTORE_FILE), KEYSTORE_PWD.toCharArray());
Key key = ks.getKey(KEYSTORE_ALIAS, KEYSTORE_PWD.toCharArray());
// Sign
PrivateKey privKey = (PrivateKey) key;
Signature signature = Signature.getInstance("SHA1WithRSA", "BC");
signature.initSign(privKey);
signature.update(fileContent);
// Build CMS
X509Certificate cert = (X509Certificate) ks.getCertificate(KEYSTORE_ALIAS);
List certList = new ArrayList();
CMSTypedData msg = new CMSProcessableByteArray(signature.sign());
certList.add(cert);
Store certs = new JcaCertStore(certList);
CMSSignedDataGenerator gen = new CMSSignedDataGenerator();
ContentSigner sha1Signer = new JcaContentSignerBuilder("SHA1withRSA").setProvider("BC").build(privKey);
gen.addSignerInfoGenerator(
new JcaSignerInfoGeneratorBuilder(new JcaDigestCalculatorProviderBuilder().setProvider("BC").build())
.build(sha1Signer, cert));
gen.addCertificates(certs);
CMSSignedData sigData = gen.generate(msg, true);
BASE64Encoder encoder = new BASE64Encoder();
String signedContent = encoder.encode((byte[]) sigData.getSignedContent().getContent());
System.out.println("Signed content: " + signedContent + "\n");
String envelopedData = encoder.encode(sigData.getEncoded());
System.out.println("Enveloped data: " + envelopedData);
FileOutputStream fos = new FileOutputStream(
"G:\\IntelliJTestProjects\\SignedZip.zip");
fos.write(envelopedData.getBytes());
fos.close();
}
我如何验证数据:
public static void main(String[] args) {
try {
Security.addProvider(new BouncyCastleProvider());
Path path = Paths
.get("G:\\IntelliJTestProjects\\SignedZip.zip");
byte[] signedContent = Files.readAllBytes(path);
String output = new String(signedContent);
System.out.println("output: " + output);
CMSSignedData cms = new CMSSignedData(Base64.decode(signedContent));
Store store = cms.getCertificates();
SignerInformationStore signers = cms.getSignerInfos();
Collection c = signers.getSigners();
Iterator it = c.iterator();
while (it.hasNext()) {
SignerInformation signer = (SignerInformation) it.next();
Collection certCollection = store.getMatches(signer.getSID());
Iterator certIt = certCollection.iterator();
X509CertificateHolder certHolder = (X509CertificateHolder) certIt.next();
X509Certificate cert = new JcaX509CertificateConverter().setProvider("BC").getCertificate(certHolder);
if (signer.verify(new JcaSimpleSignerInfoVerifierBuilder().setProvider("BC").build(cert))) {
System.out.println("verified");
}
}
CMSProcessable origData = cms.getSignedContent() ;
byte[] originalContent = (byte[]) origData.getContent();
ZipInputStream zipStream = new ZipInputStream(new ByteArrayInputStream(originalContent));
ZipEntry entry = null;
while ((entry = zipStream.getNextEntry()) != null) {
String entryName = entry.getName();
FileOutputStream out = new FileOutputStream(entryName);
byte[] byteBuff = new byte[4096];
int bytesRead = 0;
while ((bytesRead = zipStream.read(byteBuff)) != -1)
{
out.write(byteBuff, 0, bytesRead);
}
out.close();
zipStream.closeEntry();
}
zipStream.close();
} catch (Exception ex) {
ex.printStackTrace();
}
}
第2部分
好的,既然你有一个包含pkcs7签名数据的文件,让我们尝试检索内容并验证完整性和有效性.
目标是再次不将整个事物加载到内存中.看起来CMSSignedDataParser可以做到这一点.
自文档说
注意:因为我们处于流模式[...],所以解析器上的方法以适当的顺序调用是很重要的.
那么,让我们先来看看到目前为止我们实际得到了什么.为此,我使用了一个包含该行Mary had a little lamb作为输入文件的文本文件,而不是.m4v(或您的情况下为.zip)并将结果传递给http://lapo.it/asn1js/(您必须喜欢这个工具....)
因此,实际内容出现在签名数据之前,我们必须按照它们在文件中出现的顺序读取条目.反过来会更容易,但是......想法是将内容写入目标文件,无论它是否签出.如果它不只是删除文件.(缺点:如果它包含例如病毒,则可能会触发病毒扫描程序......太糟糕了.我会把处理权交给你.)
public class SignedDataTest {
... see Part 1
private static void verify(Path signedFile, Path extractToFile) throws Exception {
FileInputStream fis = new FileInputStream(signedFile.toFile());
DigestCalculatorProvider build = new JcaDigestCalculatorProviderBuilder().setProvider("BC").build();
CMSSignedDataParser sp = new CMSSignedDataParser(build, fis);
// we have to read the whole stream sp.getSignedContent().getContentStream()
// just copy it to the target file
Files.copy(sp.getSignedContent().getContentStream(), extractToFile, StandardCopyOption.REPLACE_EXISTING);
// now we can go on with the other stuff.....
Store certStore = sp.getCertificates();
// the examples create a new instance of this for each certificate.
// I don't think that's necessary, but you might want to look into that...
JcaSimpleSignerInfoVerifierBuilder verifier = new JcaSimpleSignerInfoVerifierBuilder().setProvider("BC");
for (Object objSigner : sp.getSignerInfos().getSigners()) {
SignerInformation signer = (SignerInformation) objSigner;
// as I understand it, there should be only one match ....but anyways....
for (Object objMatch : certStore.getMatches(signer.getSID())) {
X509CertificateHolder certHolder = (X509CertificateHolder) objMatch;
System.out.print("verifying against " + certHolder.getSubject().toString());
if (signer.verify(verifier.build(certHolder))) {
System.out.println(": verified");
} else {
System.out.println(": no match");
}
}
}
}
}
那么,这实际上做了什么/测试？它从pkcs7 signedData中获取签名者信息,然后再检查hashData和签名,以及signedData中包含的证书.不够好,我和任何其他攻击者都可以在那里放任何证书; 所以我创建一个新的KeyPiar为该密钥对生成一个自签名证书,并将任何zip文件放在我喜欢的地方,最好是一个讨厌的网络钓鱼工具.
这很可能是你KeyStore.getInstance("Windows-MY", "SunMSCAPI")在代码中使用的原因; 你暗示信任的KeyStore.所以,让我们这样做.
我们不是从signedData文件中的数据构建SignerInformationVerifier,而是将现成的verfier传递给该方法.此验证程序使用来自Windows"KeyStore"的证书进行准备.顺便说一下:你不能随意混合BC和SunMSCAPI供应商; 但是你可以用这种方式混合它们,即让BC检查数据的完整性,并且SunMSCAPI检查哈希是否已经被认为值得信赖的东西签名.
(对不起,得走了我会后刚刚完整的示例类;还有很多,虽然说些什么....其实一个可以写的是...其实实际上书籍.已被写入有关该主题; - ))
public class SignedDataTest {
private static final File KEYSTORE_FILE = new File("c:\\temp\\Software_View_Certificate_Authority.p12");
private static final String KEYSTORE_TYPE = "pkcs12";
private static final char[] KEYSTORE_PWD = "foobar".toCharArray();
private static final String KEYSTORE_ALIAS = "Software View Certificate Authority";
private static final Path CONTENT_SRC_PATH = Paths.get("c:\\temp\\test.txt");
private static final Path CONTENT_TARGET_PATH = Paths.get("c:\\temp\\test-retrieved.txt");
private static final Path SIGNEDDATA_TARGET_PATH = Paths.get("c:\\temp\\test.txt.signed.pkcs7");
public static void main(String[] args) throws Exception {
Security.addProvider(new BouncyCastleProvider());
doForth();
andBack();
}
private static void doForth() throws Exception {
KeyStore ks = KeyStore.getInstance(KEYSTORE_TYPE, "BC");
ks.load(new FileInputStream(KEYSTORE_FILE), KEYSTORE_PWD);
X500PrivateCredential creds = new X500PrivateCredential(
(X509Certificate) ks.getCertificate(KEYSTORE_ALIAS),
(PrivateKey) ks.getKey(KEYSTORE_ALIAS, KEYSTORE_PWD)
);
createSignature(CONTENT_SRC_PATH, creds, new FileOutputStream(SIGNEDDATA_TARGET_PATH.toFile()));
}
private static void andBack() throws Exception {
KeyStore msCertStore = KeyStore.getInstance("Windows-MY", "SunMSCAPI");
msCertStore.load(null, null);
SignerInformationVerifier verifier = new JcaSimpleSignerInfoVerifierBuilder().setProvider("SunMSCAPI")
.build(((X509Certificate) msCertStore.getCertificate("Software View Certificate Authority")));
verify(SIGNEDDATA_TARGET_PATH, CONTENT_TARGET_PATH, verifier);
}
private static void verify(Path signedFile, Path extractToFile, SignerInformationVerifier verifier) throws Exception {
FileInputStream fis = new FileInputStream(signedFile.toFile());
DigestCalculatorProvider build = new JcaDigestCalculatorProviderBuilder().setProvider("BC").build();
CMSSignedDataParser sp = new CMSSignedDataParser(build, fis);
// we have to read the whole stream sp.getSignedContent().getContentStream()
// just copy it to the target file
Files.copy(sp.getSignedContent().getContentStream(), extractToFile, StandardCopyOption.REPLACE_EXISTING);
// now we can go on with the other stuff.....
Store certStore = sp.getCertificates();
// the examples create a new instance of this for each certificate.
// I don't think that's necessary, but you might want to look into that...
for (Object objSigner : sp.getSignerInfos().getSigners()) {
SignerInformation signer = (SignerInformation) objSigner;
if (signer.verify(verifier)) {
System.out.println("verified");
// now(!) you want to keep the target content file
} else {
// actually a "org.bouncycastle.cms.CMSSignerDigestMismatchException: message-digest attribute value does not match calculated value"
// exception will be thrown in case the contents has been altered
// So, you will need a try-catch(-finally?) construct to delete the target contents file in such cases....
System.out.println("no match");
}
}
}
private static void createSignature(Path srcfile, X500PrivateCredential creds, FileOutputStream target) throws Exception {
CMSSignedDataStreamGenerator gen = new CMSSignedDataStreamGenerator() {
{
addSignerInfoGenerator(
new JcaSignerInfoGeneratorBuilder(
new JcaDigestCalculatorProviderBuilder().setProvider("BC").build()
).build(
new JcaContentSignerBuilder("SHA1withRSA").setProvider("BC").build(creds.getPrivateKey()),
creds.getCertificate()
)
);
addCertificates(new JcaCertStore(new ArrayList<X509Certificate>() {
{
add(creds.getCertificate());
}
}));
}
};
try (OutputStream sigOut = gen.open(target, true)) {
Files.copy(srcfile, sigOut);
}
}
}
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