使用BouncyCastle将已签名/已认证的属性添加到CMS签名
我想使用Bouncycastle生成一个简单的CMS签名。此代码有效!
Security.addProvider(new BouncyCastleProvider()); String password = "123456";
KeyStore ks = KeyStore.getInstance("PKCS12");
ks.load(new FileInputStream("c:/cert_123456.p12"), password.toCharArray());
String alias = (String)ks.aliases().nextElement();
PrivateKey key = (PrivateKey)ks.getKey(alias, password.toCharArray());
Certificate[] chain = ks.getCertificateChain(alias);
CMSSignedDataGenerator generator = new CMSSignedDataGenerator();
generator.addSigner(key, (X509Certificate)chain[0], CMSSignedDataGenerator.DIGEST_SHA1);
ArrayList list = new ArrayList();
for (int i = 0; i < chain.length; i++) {
list.add(chain[i]);
}
CertStore chainStore = CertStore.getInstance("Collection", new CollectionCertStoreParameters(list), "BC");
generator.addCertificatesAndCRLs(chainStore);
CMSProcessable content = new CMSProcessableByteArray("test".getBytes());
CMSSignedData signedData = generator.generate(content, false, "BC");
byte[] pk = signedData.getEncoded();
但是,如何添加签名属性?
我想删除默认的签名属性并添加signature-policy-identifier。
文章非常受欢迎。
回答:
首先,您似乎正在使用最新版本的Bouncy
Castle中不推荐使用的构造。要添加经过身份验证/签名的属性,您必须将它们打包到AttributeTable中,将签名的属性添加到签名者,如下所示:
ASN1EncodableVector signedAttributes = new ASN1EncodableVector();signedAttributes.add(new Attribute(CMSAttributes.contentType, new DERSet(new ASN1ObjectIdentifier("1.2.840.113549.1.7.1"))));
signedAttributes.add(new Attribute(CMSAttributes.messageDigest, new DERSet(new DEROctetString(digestBytes))));
signedAttributes.add(new Attribute(CMSAttributes.signingTime, new DERSet(new DERUTCTime(signingDate))));
AttributeTable signedAttributesTable = new AttributeTable(signedAttributes);
然后在addSigner方法之一中使用它。正如我在开始时已经提到的那样,不建议使用此方法,建议您使用Generators和Generator
Builders。这是一个简短的示例:
/* Construct signed attributes */ ASN1EncodableVector signedAttributes = new ASN1EncodableVector();
signedAttributes.add(new Attribute(CMSAttributes.contentType, new DERSet(new ASN1ObjectIdentifier("1.2.840.113549.1.7.1"))));
signedAttributes.add(new Attribute(CMSAttributes.messageDigest, new DERSet(new DEROctetString(digestBytes))));
signedAttributes.add(new Attribute(CMSAttributes.signingTime, new DERSet(new DERUTCTime(signingDate))));
AttributeTable signedAttributesTable = new AttributeTable(signedAttributes);
signedAttributesTable.toASN1EncodableVector();
DefaultSignedAttributeTableGenerator signedAttributeGenerator = new DefaultSignedAttributeTableGenerator(signedAttributesTable);
/* Build the SignerInfo generator builder, that will build the generator... that will generate the SignerInformation... */
SignerInfoGeneratorBuilder signerInfoBuilder = new SignerInfoGeneratorBuilder(new JcaDigestCalculatorProviderBuilder().setProvider("BC").build());
signerInfoBuilder.setSignedAttributeGenerator(signedAttributeGenerator);
CMSSignedDataGenerator generator = new CMSSignedDataGenerator();
JcaContentSignerBuilder contentSigner = new JcaContentSignerBuilder("SHA1withRSA");
contentSigner.setProvider("BC");
generator.addSignerInfoGenerator(signerInfoBuilder.build(contentSigner.build(this.signingKey), new X509CertificateHolder(this.signingCert.getEncoded())));
ArrayList<X509CertificateHolder> signingChainHolder = new ArrayList<X509CertificateHolder>();
Iterator i = this.signingChain.iterator();
while (i.hasNext()) {
X509CertificateObject cert = (X509CertificateObject)i.next();
signingChainHolder.add(new X509CertificateHolder(cert.getEncoded()));
}
generator.addCertificates(new JcaCertStore(signingChainHolder));
generator.generate(new CMSAbsentContent(), "BC").getEncoded();
它非常笨重,可能还无法正常工作(我正在编写过程中,在研究某些东西时偶然发现了您的问题),尤其是signingDate部分,它可能必须是new
DERSet(new Time(new Date))(update:它可以使用DERUTCTime
)。
有点离题:我仍然无法理解Signed和Authenticated属性之间的区别,Bouncy
Castle拥有DefaultAuthenticatedAttributeTableGenerator和DefaultSignedAttributeTableGenerator类,它们与Signers完美配合。两者之间在signingTime方面似乎有一些细微的差异,如果不存在,SignedAttributes默认会添加signingTime。RFC提到了两种属性类型,但是我找不到任何确定的东西。
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