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。

以上是 使用BouncyCastle将已签名/已认证的属性添加到CMS签名 的全部内容, 来源链接: utcz.com/qa/416293.html

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