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这篇文章给大家介绍RSA如何无视PEM文件格式直接读取PEM文件为PrivateKey和PublicKey，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。

RSA无视PEM文件格式（pkcs#1,pkcs#8，有无密码 ）直接读取PEM文件为PrivateKey，PublicKey

import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;import org.bouncycastle.jce.provider.BouncyCastleProvider;import org.bouncycastle.openssl.PEMDecryptorProvider;import org.bouncycastle.openssl.PEMEncryptedKeyPair;import org.bouncycastle.openssl.PEMKeyPair;import org.bouncycastle.openssl.PEMParser;import org.bouncycastle.openssl.jcajce.JcaPEMKeyConverter;import org.bouncycastle.openssl.jcajce.JceOpenSSLPKCS8DecryptorProviderBuilder;import org.bouncycastle.openssl.jcajce.JcePEMDecryptorProviderBuilder;import org.bouncycastle.operator.InputDecryptorProvider;import org.bouncycastle.operator.OperatorCreationException;import org.bouncycastle.pkcs.PKCS8EncryptedPrivateKeyInfo;import org.bouncycastle.pkcs.PKCSException;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import java.io.IOException;import java.io.StringReader;import java.security.Key;import java.security.KeyPair;import java.security.PrivateKey;import java.security.PublicKey;/** * RSA无视PEM文件格式（pkcs#1,pkcs#8，有无密码 ）直接读取PEM文件为PrivateKey，PublicKey */public class RSAUtil { private final static Logger logger = LoggerFactory.getLogger(RSAUtil.class); static { java.security.Security.addProvider( new org.bouncycastle.jce.provider.BouncyCastleProvider() ); } public static PrivateKey privateKey(String pemString, String password) { try { return (PrivateKey) parseKey(pemString, password); } catch (IOException e) { logger.error("privateKey error", e); e.printStackTrace(); } return null; } public static PrivateKey privateKey(String pemString) { try { return (PrivateKey) parseKey(pemString, null); } catch (IOException e) { logger.error("privateKey error", e); } return null; } public static PublicKey publicKey(String pemString) { try { return (PublicKey) parseKey(pemString, null); } catch (IOException e) { logger.error("publicKey error", e); } return null; } /** * Parses a Key instance from a PEM representation. *

* When the provided key is encrypted, the provided pass phrase is applied. * * @param pemString a PEM representation of a private key (cannot be null or empty) * @param passPhrase optional pass phrase (must be present if the private key is encrypted). * @return a Key instance (never null) */ public static Key parseKey(String pemString, String passPhrase) throws IOException { if (passPhrase == null) { passPhrase = ""; } try (StringReader reader = new StringReader(pemString); // PEMParser pemParser = new PEMParser(reader)) { final Object object = pemParser.readObject(); final JcaPEMKeyConverter converter = new JcaPEMKeyConverter().setProvider(BouncyCastleProvider.PROVIDER_NAME); final KeyPair kp; if (object instanceof PEMEncryptedKeyPair) { // Encrypted key - we will use provided password final PEMDecryptorProvider decProv = new JcePEMDecryptorProviderBuilder().build(passPhrase.toCharArray()); kp = converter.getKeyPair(((PEMEncryptedKeyPair) object).decryptKeyPair(decProv)); } else if (object instanceof PKCS8EncryptedPrivateKeyInfo) { // Encrypted key - we will use provided password try { final PKCS8EncryptedPrivateKeyInfo encryptedInfo = (PKCS8EncryptedPrivateKeyInfo) object; final InputDecryptorProvider provider = new JceOpenSSLPKCS8DecryptorProviderBuilder().build(passPhrase.toCharArray()); final PrivateKeyInfo privateKeyInfo = encryptedInfo.decryptPrivateKeyInfo(provider); return converter.getPrivateKey(privateKeyInfo); } catch (PKCSException | OperatorCreationException e) { throw new IOException("Unable to decrypt private key.", e); } } else if (object instanceof PrivateKeyInfo) { return converter.getPrivateKey((PrivateKeyInfo) object); } else if (object instanceof SubjectPublicKeyInfo) { return converter.getPublicKey((SubjectPublicKeyInfo) object); } else { // Unencrypted key - no password needed kp = converter.getKeyPair((PEMKeyPair) object); } return kp.getPrivate(); } }}关于RSA如何无视PEM文件格式直接读取PEM文件为PrivateKey和PublicKey就分享到这里了，希望以上内容可以对大家有一定的帮助，可以学到更多知识。如果觉得文章不错，可以把它分享出去让更多的人看到。

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