这种itext数字签名的实现有什么问题？
我从互联网上拿了一个示例代码，我尝试签署一份文件。
这是代码
public class SimpleSignature { public static final String KEYSTORE = "c:/key/sano"; public static final char[] PASSWORD = "Chennai".toCharArray(); public static final String SRC = "c:/itext/unsigned.pdf"; public static final String DEST = "c:/itext/signed.pdf"; public void sign(String src, String dest, Certificate[] chain, PrivateKey pk, String digestAlgorithm, String provider, CryptoStandard subfilter, String reason, String location) throws GeneralSecurityException, IOException, DocumentException { // Creating the reader and the stamper PdfReader reader = new PdfReader(src); FileOutputStream os = new FileOutputStream(dest); PdfStamper stamper = PdfStamper.createSignature(reader, os, '\0'); // Creating the appearance PdfSignatureAppearance appearance = stamper.getSignatureAppearance(); appearance.setReason(reason); appearance.setLocation(location); appearance.setVisibleSignature(new Rectangle(36, 748, 144, 780), 1, "sig"); // Creating the signature ExternalDigest digest = new BouncyCastleDigest(); ExternalSignature signature = new PrivateKeySignature(pk, digestAlgorithm, provider); MakeSignature.signDetached(appearance, digest, signature, chain, null, null, null, 0, subfilter); } public static void main(String[] args) throws GeneralSecurityException, IOException, DocumentException { BouncyCastleProvider provider = new BouncyCastleProvider(); Security.addProvider(provider); KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType()); ks.load(new FileInputStream(KEYSTORE), PASSWORD); String alias = (String)ks.aliases().nextElement(); PrivateKey pk = (PrivateKey) ks.getKey(alias, PASSWORD); Certificate[] chain = ks.getCertificateChain(alias); SimpleSignature app = new SimpleSignature(); app.sign(SRC, String.format(DEST, 1), chain, pk, DigestAlgorithms.SHA256, provider.getName(), CryptoStandard.CMS, "Test 1", "Ghent"); app.sign(SRC, String.format(DEST, 2), chain, pk, DigestAlgorithms.SHA512, provider.getName(), CryptoStandard.CMS, "Test 2", "Ghent"); app.sign(SRC, String.format(DEST, 3), chain, pk, DigestAlgorithms.SHA256, provider.getName(), CryptoStandard.CADES, "Test 3", "Ghent"); app.sign(SRC, String.format(DEST, 4), chain, pk, DigestAlgorithms.RIPEMD160, provider.getName(), CryptoStandard.CADES, "Test 4", "Ghent"); } } 当我运行此代码。 我收到了这个错误。
Exception in thread "main" java.lang.NoSuchMethodError: org.bouncycastle.asn1.ASN1Integer.(J)V at com.itextpdf.text.pdf.security.PdfPKCS7.getEncodedPKCS7(PdfPKCS7.java:797) at com.itextpdf.text.pdf.security.MakeSignature.signDetached(MakeSignature.java:149) at org.allcolor.yahp.sample.SimpleSignature.sign(SimpleSignature.java:45) at org.allcolor.yahp.sample.SimpleSignature.main(SimpleSignature.java:62)
知道为什么我得到这个错误。
我使用itext5.3.4和bcprov-jdk15on-1.47.jar成功运行了样本