Estoy escribiendo un pequeño fragmento de código que lee la clave pública y privada almacenada en el archivo .pem. Estoy usando los siguientes comandos para generar las claves.
Debajo del comando para generar un par de claves.
$openssl genrsa -out mykey.pem 2048
Este comando para generar la clave privada
$openssl pkcs8 -topk8 -inform PEM -outform PEM -in mykey.pem \
-out private_key.pem -nocrypt
y este comando para obtener la clave pública.
$ openssl rsa -in mykey.pem -pubout -outform DER -out public_key.der
He escrito dos métodos que leen la clave privada y la clave pública respectivamente.
public PrivateKey getPemPrivateKey(String filename, String algorithm) throws Exception {
File f = new File(filename);
FileInputStream fis = new FileInputStream(f);
DataInputStream dis = new DataInputStream(fis);
byte[] keyBytes = new byte[(int) f.length()];
dis.readFully(keyBytes);
dis.close();
String temp = new String(keyBytes);
String privKeyPEM = temp.replace("-----BEGIN PRIVATE KEY-----\n", "");
privKeyPEM = privKeyPEM.replace("-----END PRIVATE KEY-----", "");
//System.out.println("Private key\n"+privKeyPEM);
Base64 b64 = new Base64();
byte [] decoded = b64.decode(privKeyPEM);
PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(decoded);
KeyFactory kf = KeyFactory.getInstance(algorithm);
return kf.generatePrivate(spec);
}
public PublicKey getPemPublicKey(String filename, String algorithm) throws Exception {
File f = new File(filename);
FileInputStream fis = new FileInputStream(f);
DataInputStream dis = new DataInputStream(fis);
byte[] keyBytes = new byte[(int) f.length()];
dis.readFully(keyBytes);
dis.close();
String temp = new String(keyBytes);
String publicKeyPEM = temp.replace("-----BEGIN PUBLIC KEY-----\n", "");
publicKeyPEM = publicKeyPEM.replace("-----END PUBLIC KEY-----", "");
Base64 b64 = new Base64();
byte [] decoded = b64.decode(publicKeyPEM);
X509EncodedKeySpec spec =
new X509EncodedKeySpec(decoded);
KeyFactory kf = KeyFactory.getInstance(algorithm);
return kf.generatePublic(spec);
}
Siento que esta es una forma ingenua de hacerlo. No podría encontrar una mejor manera de hacerlo a través de Internet. ¿Alguien puede sugerirme cuál es la mejor manera de escribir el mismo código para manejar los casos genéricos? No quiero utilizar ningún tipo de biblioteca de terceros.
Tengo un conocimiento muy básico de canto / encriptación y casi no uso ninguna API de seguridad de Java. Entonces, si no tengo sentido en alguna parte, por favor señale.
openssl -nocrypt
comando. ¿Esa parte también se puede hacer en Java?Respuestas:
Prueba esta clase.
package groovy; import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.security.GeneralSecurityException; import java.security.InvalidKeyException; import java.security.KeyFactory; import java.security.NoSuchAlgorithmException; import java.security.PrivateKey; import java.security.PublicKey; import java.security.Signature; import java.security.SignatureException; import java.security.interfaces.RSAPrivateKey; import java.security.interfaces.RSAPublicKey; import java.security.spec.PKCS8EncodedKeySpec; import java.security.spec.X509EncodedKeySpec; import javax.crypto.Cipher; import org.apache.commons.codec.binary.Base64; public class RSA { private static String getKey(String filename) throws IOException { // Read key from file String strKeyPEM = ""; BufferedReader br = new BufferedReader(new FileReader(filename)); String line; while ((line = br.readLine()) != null) { strKeyPEM += line + "\n"; } br.close(); return strKeyPEM; } public static RSAPrivateKey getPrivateKey(String filename) throws IOException, GeneralSecurityException { String privateKeyPEM = getKey(filename); return getPrivateKeyFromString(privateKeyPEM); } public static RSAPrivateKey getPrivateKeyFromString(String key) throws IOException, GeneralSecurityException { String privateKeyPEM = key; privateKeyPEM = privateKeyPEM.replace("-----BEGIN PRIVATE KEY-----\n", ""); privateKeyPEM = privateKeyPEM.replace("-----END PRIVATE KEY-----", ""); byte[] encoded = Base64.decodeBase64(privateKeyPEM); KeyFactory kf = KeyFactory.getInstance("RSA"); PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(encoded); RSAPrivateKey privKey = (RSAPrivateKey) kf.generatePrivate(keySpec); return privKey; } public static RSAPublicKey getPublicKey(String filename) throws IOException, GeneralSecurityException { String publicKeyPEM = getKey(filename); return getPublicKeyFromString(publicKeyPEM); } public static RSAPublicKey getPublicKeyFromString(String key) throws IOException, GeneralSecurityException { String publicKeyPEM = key; publicKeyPEM = publicKeyPEM.replace("-----BEGIN PUBLIC KEY-----\n", ""); publicKeyPEM = publicKeyPEM.replace("-----END PUBLIC KEY-----", ""); byte[] encoded = Base64.decodeBase64(publicKeyPEM); KeyFactory kf = KeyFactory.getInstance("RSA"); RSAPublicKey pubKey = (RSAPublicKey) kf.generatePublic(new X509EncodedKeySpec(encoded)); return pubKey; } public static String sign(PrivateKey privateKey, String message) throws NoSuchAlgorithmException, InvalidKeyException, SignatureException, UnsupportedEncodingException { Signature sign = Signature.getInstance("SHA1withRSA"); sign.initSign(privateKey); sign.update(message.getBytes("UTF-8")); return new String(Base64.encodeBase64(sign.sign()), "UTF-8"); } public static boolean verify(PublicKey publicKey, String message, String signature) throws SignatureException, NoSuchAlgorithmException, UnsupportedEncodingException, InvalidKeyException { Signature sign = Signature.getInstance("SHA1withRSA"); sign.initVerify(publicKey); sign.update(message.getBytes("UTF-8")); return sign.verify(Base64.decodeBase64(signature.getBytes("UTF-8"))); } public static String encrypt(String rawText, PublicKey publicKey) throws IOException, GeneralSecurityException { Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE, publicKey); return Base64.encodeBase64String(cipher.doFinal(rawText.getBytes("UTF-8"))); } public static String decrypt(String cipherText, PrivateKey privateKey) throws IOException, GeneralSecurityException { Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.DECRYPT_MODE, privateKey); return new String(cipher.doFinal(Base64.decodeBase64(cipherText)), "UTF-8"); } } Required jar library "common-codec-1.6"
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Only RSAPublicKeySpec and X509EncodedKeySpec supported for RSA public keys
. Cambió aX509EncodedKeySpec
y luego obtuvejava.security.InvalidKeyException: IOException: DerInputStream.getLength(): lengthTag=111, too big.
. Esto es con un archivo pem generado por AWS EC2RSAPublicKeySpec
ya que su clave pública parece estar enPKCS#1
formato y no enPKCS#8
formato. En el último caso, debe usarX509EncodedKeySpec
(y noPKCS8EncodedKeySpec
como dice la respuesta actualmente). Se puede distinguir entre los dos tomando un vistazo a la cabecera,BEGIN RSA PUBLIC KEY
vsBEGIN PUBLIC KEY
.RSAPublicKeySpec
. Por lo que es probablemente más fácil de convertir sólo a partirPKCS#1
dePKCS#8
laopenssl
o programas similares ...Una opción es usar PEMParser de bouncycastle :
A continuación, se muestra un ejemplo del uso del código de prueba del analizador :
package org.bouncycastle.openssl.test; import java.io.BufferedReader; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.Reader; import java.math.BigInteger; import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.PrivateKey; import java.security.PublicKey; import java.security.SecureRandom; import java.security.Security; import java.security.Signature; import java.security.interfaces.DSAPrivateKey; import java.security.interfaces.RSAPrivateCrtKey; import java.security.interfaces.RSAPrivateKey; import org.bouncycastle.asn1.ASN1ObjectIdentifier; import org.bouncycastle.asn1.cms.CMSObjectIdentifiers; import org.bouncycastle.asn1.cms.ContentInfo; import org.bouncycastle.asn1.pkcs.PrivateKeyInfo; import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo; import org.bouncycastle.asn1.x9.ECNamedCurveTable; import org.bouncycastle.asn1.x9.X9ECParameters; import org.bouncycastle.cert.X509CertificateHolder; 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.PEMWriter; import org.bouncycastle.openssl.PasswordFinder; 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.pkcs.PKCS8EncryptedPrivateKeyInfo; import org.bouncycastle.util.test.SimpleTest; /** * basic class for reading test.pem - the password is "secret" */ public class ParserTest extends SimpleTest { private static class Password implements PasswordFinder { char[] password; Password( char[] word) { this.password = word; } public char[] getPassword() { return password; } } public String getName() { return "PEMParserTest"; } private PEMParser openPEMResource( String fileName) { InputStream res = this.getClass().getResourceAsStream(fileName); Reader fRd = new BufferedReader(new InputStreamReader(res)); return new PEMParser(fRd); } public void performTest() throws Exception { PEMParser pemRd = openPEMResource("test.pem"); Object o; PEMKeyPair pemPair; KeyPair pair; while ((o = pemRd.readObject()) != null) { if (o instanceof KeyPair) { //pair = (KeyPair)o; //System.out.println(pair.getPublic()); //System.out.println(pair.getPrivate()); } else { //System.out.println(o.toString()); } } // test bogus lines before begin are ignored. pemRd = openPEMResource("extratest.pem"); while ((o = pemRd.readObject()) != null) { if (!(o instanceof X509CertificateHolder)) { fail("wrong object found"); } } // // pkcs 7 data // pemRd = openPEMResource("pkcs7.pem"); ContentInfo d = (ContentInfo)pemRd.readObject(); if (!d.getContentType().equals(CMSObjectIdentifiers.envelopedData)) { fail("failed envelopedData check"); } // // ECKey // pemRd = openPEMResource("eckey.pem"); ASN1ObjectIdentifier ecOID = (ASN1ObjectIdentifier)pemRd.readObject(); X9ECParameters ecSpec = ECNamedCurveTable.getByOID(ecOID); if (ecSpec == null) { fail("ecSpec not found for named curve"); } pemPair = (PEMKeyPair)pemRd.readObject(); pair = new JcaPEMKeyConverter().setProvider("BC").getKeyPair(pemPair); Signature sgr = Signature.getInstance("ECDSA", "BC"); sgr.initSign(pair.getPrivate()); byte[] message = new byte[] { (byte)'a', (byte)'b', (byte)'c' }; sgr.update(message); byte[] sigBytes = sgr.sign(); sgr.initVerify(pair.getPublic()); sgr.update(message); if (!sgr.verify(sigBytes)) { fail("EC verification failed"); } if (!pair.getPublic().getAlgorithm().equals("ECDSA")) { fail("wrong algorithm name on public got: " + pair.getPublic().getAlgorithm()); } if (!pair.getPrivate().getAlgorithm().equals("ECDSA")) { fail("wrong algorithm name on private"); } // // ECKey -- explicit parameters // pemRd = openPEMResource("ecexpparam.pem"); ecSpec = (X9ECParameters)pemRd.readObject(); pemPair = (PEMKeyPair)pemRd.readObject(); pair = new JcaPEMKeyConverter().setProvider("BC").getKeyPair(pemPair); sgr = Signature.getInstance("ECDSA", "BC"); sgr.initSign(pair.getPrivate()); message = new byte[] { (byte)'a', (byte)'b', (byte)'c' }; sgr.update(message); sigBytes = sgr.sign(); sgr.initVerify(pair.getPublic()); sgr.update(message); if (!sgr.verify(sigBytes)) { fail("EC verification failed"); } if (!pair.getPublic().getAlgorithm().equals("ECDSA")) { fail("wrong algorithm name on public got: " + pair.getPublic().getAlgorithm()); } if (!pair.getPrivate().getAlgorithm().equals("ECDSA")) { fail("wrong algorithm name on private"); } // // writer/parser test // KeyPairGenerator kpGen = KeyPairGenerator.getInstance("RSA", "BC"); pair = kpGen.generateKeyPair(); keyPairTest("RSA", pair); kpGen = KeyPairGenerator.getInstance("DSA", "BC"); kpGen.initialize(512, new SecureRandom()); pair = kpGen.generateKeyPair(); keyPairTest("DSA", pair); // // PKCS7 // ByteArrayOutputStream bOut = new ByteArrayOutputStream(); PEMWriter pWrt = new PEMWriter(new OutputStreamWriter(bOut)); pWrt.writeObject(d); pWrt.close(); pemRd = new PEMParser(new InputStreamReader(new ByteArrayInputStream(bOut.toByteArray()))); d = (ContentInfo)pemRd.readObject(); if (!d.getContentType().equals(CMSObjectIdentifiers.envelopedData)) { fail("failed envelopedData recode check"); } // OpenSSL test cases (as embedded resources) doOpenSslDsaTest("unencrypted"); doOpenSslRsaTest("unencrypted"); doOpenSslTests("aes128"); doOpenSslTests("aes192"); doOpenSslTests("aes256"); doOpenSslTests("blowfish"); doOpenSslTests("des1"); doOpenSslTests("des2"); doOpenSslTests("des3"); doOpenSslTests("rc2_128"); doOpenSslDsaTest("rc2_40_cbc"); doOpenSslRsaTest("rc2_40_cbc"); doOpenSslDsaTest("rc2_64_cbc"); doOpenSslRsaTest("rc2_64_cbc"); doDudPasswordTest("7fd98", 0, "corrupted stream - out of bounds length found"); doDudPasswordTest("ef677", 1, "corrupted stream - out of bounds length found"); doDudPasswordTest("800ce", 2, "unknown tag 26 encountered"); doDudPasswordTest("b6cd8", 3, "DEF length 81 object truncated by 56"); doDudPasswordTest("28ce09", 4, "DEF length 110 object truncated by 28"); doDudPasswordTest("2ac3b9", 5, "DER length more than 4 bytes: 11"); doDudPasswordTest("2cba96", 6, "DEF length 100 object truncated by 35"); doDudPasswordTest("2e3354", 7, "DEF length 42 object truncated by 9"); doDudPasswordTest("2f4142", 8, "DER length more than 4 bytes: 14"); doDudPasswordTest("2fe9bb", 9, "DER length more than 4 bytes: 65"); doDudPasswordTest("3ee7a8", 10, "DER length more than 4 bytes: 57"); doDudPasswordTest("41af75", 11, "unknown tag 16 encountered"); doDudPasswordTest("1704a5", 12, "corrupted stream detected"); doDudPasswordTest("1c5822", 13, "unknown object in getInstance: org.bouncycastle.asn1.DERUTF8String"); doDudPasswordTest("5a3d16", 14, "corrupted stream detected"); doDudPasswordTest("8d0c97", 15, "corrupted stream detected"); doDudPasswordTest("bc0daf", 16, "corrupted stream detected"); doDudPasswordTest("aaf9c4d",17, "corrupted stream - out of bounds length found"); doNoPasswordTest(); // encrypted private key test InputDecryptorProvider pkcs8Prov = new JceOpenSSLPKCS8DecryptorProviderBuilder().build("password".toCharArray()); pemRd = openPEMResource("enckey.pem"); PKCS8EncryptedPrivateKeyInfo encPrivKeyInfo = (PKCS8EncryptedPrivateKeyInfo)pemRd.readObject(); JcaPEMKeyConverter converter = new JcaPEMKeyConverter().setProvider("BC"); RSAPrivateCrtKey privKey = (RSAPrivateCrtKey)converter.getPrivateKey(encPrivKeyInfo.decryptPrivateKeyInfo(pkcs8Prov)); if (!privKey.getPublicExponent().equals(new BigInteger("10001", 16))) { fail("decryption of private key data check failed"); } // general PKCS8 test pemRd = openPEMResource("pkcs8test.pem"); Object privInfo; while ((privInfo = pemRd.readObject()) != null) { if (privInfo instanceof PrivateKeyInfo) { privKey = (RSAPrivateCrtKey)converter.getPrivateKey(PrivateKeyInfo.getInstance(privInfo)); } else { privKey = (RSAPrivateCrtKey)converter.getPrivateKey(((PKCS8EncryptedPrivateKeyInfo)privInfo).decryptPrivateKeyInfo(pkcs8Prov)); } if (!privKey.getPublicExponent().equals(new BigInteger("10001", 16))) { fail("decryption of private key data check failed"); } } } private void keyPairTest( String name, KeyPair pair) throws IOException { PEMParser pemRd; ByteArrayOutputStream bOut = new ByteArrayOutputStream(); PEMWriter pWrt = new PEMWriter(new OutputStreamWriter(bOut)); pWrt.writeObject(pair.getPublic()); pWrt.close(); pemRd = new PEMParser(new InputStreamReader(new ByteArrayInputStream(bOut.toByteArray()))); SubjectPublicKeyInfo pub = SubjectPublicKeyInfo.getInstance(pemRd.readObject()); JcaPEMKeyConverter converter = new JcaPEMKeyConverter().setProvider("BC"); PublicKey k = converter.getPublicKey(pub); if (!k.equals(pair.getPublic())) { fail("Failed public key read: " + name); } bOut = new ByteArrayOutputStream(); pWrt = new PEMWriter(new OutputStreamWriter(bOut)); pWrt.writeObject(pair.getPrivate()); pWrt.close(); pemRd = new PEMParser(new InputStreamReader(new ByteArrayInputStream(bOut.toByteArray()))); KeyPair kPair = converter.getKeyPair((PEMKeyPair)pemRd.readObject()); if (!kPair.getPrivate().equals(pair.getPrivate())) { fail("Failed private key read: " + name); } if (!kPair.getPublic().equals(pair.getPublic())) { fail("Failed private key public read: " + name); } } private void doOpenSslTests( String baseName) throws IOException { doOpenSslDsaModesTest(baseName); doOpenSslRsaModesTest(baseName); } private void doOpenSslDsaModesTest( String baseName) throws IOException { doOpenSslDsaTest(baseName + "_cbc"); doOpenSslDsaTest(baseName + "_cfb"); doOpenSslDsaTest(baseName + "_ecb"); doOpenSslDsaTest(baseName + "_ofb"); } private void doOpenSslRsaModesTest( String baseName) throws IOException { doOpenSslRsaTest(baseName + "_cbc"); doOpenSslRsaTest(baseName + "_cfb"); doOpenSslRsaTest(baseName + "_ecb"); doOpenSslRsaTest(baseName + "_ofb"); } private void doOpenSslDsaTest( String name) throws IOException { String fileName = "dsa/openssl_dsa_" + name + ".pem"; doOpenSslTestFile(fileName, DSAPrivateKey.class); } private void doOpenSslRsaTest( String name) throws IOException { String fileName = "rsa/openssl_rsa_" + name + ".pem"; doOpenSslTestFile(fileName, RSAPrivateKey.class); } private void doOpenSslTestFile( String fileName, Class expectedPrivKeyClass) throws IOException { JcaPEMKeyConverter converter = new JcaPEMKeyConverter().setProvider("BC"); PEMDecryptorProvider decProv = new JcePEMDecryptorProviderBuilder().setProvider("BC").build("changeit".toCharArray()); PEMParser pr = openPEMResource("data/" + fileName); Object o = pr.readObject(); if (o == null || !((o instanceof PEMKeyPair) || (o instanceof PEMEncryptedKeyPair))) { fail("Didn't find OpenSSL key"); } KeyPair kp = (o instanceof PEMEncryptedKeyPair) ? converter.getKeyPair(((PEMEncryptedKeyPair)o).decryptKeyPair(decProv)) : converter.getKeyPair((PEMKeyPair)o); PrivateKey privKey = kp.getPrivate(); if (!expectedPrivKeyClass.isInstance(privKey)) { fail("Returned key not of correct type"); } } private void doDudPasswordTest(String password, int index, String message) { // illegal state exception check - in this case the wrong password will // cause an underlying class cast exception. try { PEMDecryptorProvider decProv = new JcePEMDecryptorProviderBuilder().setProvider("BC").build(password.toCharArray()); PEMParser pemRd = openPEMResource("test.pem"); Object o; while ((o = pemRd.readObject()) != null) { if (o instanceof PEMEncryptedKeyPair) { ((PEMEncryptedKeyPair)o).decryptKeyPair(decProv); } } fail("issue not detected: " + index); } catch (IOException e) { if (e.getCause() != null && !e.getCause().getMessage().endsWith(message)) { fail("issue " + index + " exception thrown, but wrong message"); } else if (e.getCause() == null && !e.getMessage().equals(message)) { e.printStackTrace(); fail("issue " + index + " exception thrown, but wrong message"); } } } private void doNoPasswordTest() throws IOException { PEMDecryptorProvider decProv = new JcePEMDecryptorProviderBuilder().setProvider("BC").build("".toCharArray()); PEMParser pemRd = openPEMResource("smimenopw.pem"); Object o; PrivateKeyInfo key = null; while ((o = pemRd.readObject()) != null) { key = (PrivateKeyInfo)o; } if (key == null) { fail("private key not detected"); } } public static void main( String[] args) { Security.addProvider(new BouncyCastleProvider()); runTest(new ParserTest()); } }
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Java 9+:
private byte[] loadPEM(String resource) throws IOException { URL url = getClass().getResource(resource); InputStream in = url.openStream(); String pem = new String(in.readAllBytes(), StandardCharsets.ISO_8859_1); Pattern parse = Pattern.compile("(?m)(?s)^---*BEGIN.*---*$(.*)^---*END.*---*$.*"); String encoded = parse.matcher(pem).replaceFirst("$1"); return Base64.getMimeDecoder().decode(encoded); } @Test public void test() throws Exception { KeyFactory kf = KeyFactory.getInstance("RSA"); CertificateFactory cf = CertificateFactory.getInstance("X.509"); PrivateKey key = kf.generatePrivate(new PKCS8EncodedKeySpec(loadPEM("test.key"))); PublicKey pub = kf.generatePublic(new X509EncodedKeySpec(loadPEM("test.pub"))); Certificate crt = cf.generateCertificate(getClass().getResourceAsStream("test.crt")); }
Java 8:
reemplace la
in.readAllBytes()
llamada con una llamada a esto:byte[] readAllBytes(InputStream in) throws IOException { ByteArrayOutputStream baos= new ByteArrayOutputStream(); byte[] buf = new byte[1024]; for (int read=0; read != -1; read = in.read(buf)) { baos.write(buf, 0, read); } return baos.toByteArray(); }
gracias a Daniel por notar problemas de compatibilidad con API
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.pem
archivo de la caja, o tenemos que hacer esto :) Sin embargoBueno, mi código es como el tuyo, con pequeñas diferencias ...
public static X509Certificate loadPublicX509(String fileName) throws GeneralSecurityException { InputStream is = null; X509Certificate crt = null; try { is = fileName.getClass().getResourceAsStream("/" + fileName); CertificateFactory cf = CertificateFactory.getInstance("X.509"); crt = (X509Certificate)cf.generateCertificate(is); } finally { closeSilent(is); } return crt; } public static PrivateKey loadPrivateKey(String fileName) throws IOException, GeneralSecurityException { PrivateKey key = null; InputStream is = null; try { is = fileName.getClass().getResourceAsStream("/" + fileName); BufferedReader br = new BufferedReader(new InputStreamReader(is)); StringBuilder builder = new StringBuilder(); boolean inKey = false; for (String line = br.readLine(); line != null; line = br.readLine()) { if (!inKey) { if (line.startsWith("-----BEGIN ") && line.endsWith(" PRIVATE KEY-----")) { inKey = true; } continue; } else { if (line.startsWith("-----END ") && line.endsWith(" PRIVATE KEY-----")) { inKey = false; break; } builder.append(line); } } // byte[] encoded = DatatypeConverter.parseBase64Binary(builder.toString()); PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(encoded); KeyFactory kf = KeyFactory.getInstance("RSA"); key = kf.generatePrivate(keySpec); } finally { closeSilent(is); } return key; } public static void closeSilent(final InputStream is) { if (is == null) return; try { is.close(); } catch (Exception ign) {} }
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-----BEGIN RSA PRIVATE KEY-----
es un formato diferente, NO PKCS8, y tratar de leerlo como PKCS8 no funcionará. Además, un certificado es algo diferente a una clave pública sin procesar, por lo que esto no funcionará para los datos de esta Q en absoluto.Creo que en la definición de su clave privada, debe reemplazar:
X509EncodedKeySpec spec = new X509EncodedKeySpec(decoded);
con:
PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(decoded);
Mira tu
openssl
comando:Y la excepción de Java:
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Las bibliotecas de Java hacen que sea casi una línea leer el certificado público, tal como lo genera openssl:
val certificate: X509Certificate = ByteArrayInputStream( publicKeyCert.toByteArray(Charsets.US_ASCII)) .use { CertificateFactory.getInstance("X.509") .generateCertificate(it) as X509Certificate }
Pero, diablos, leer la clave privada fue problemático:
RSAPrivateKey
.ver esto: Solución final en kotlin
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Para obtener la clave pública, simplemente puede hacer:
public static PublicKey getPublicKeyFromCertFile(final String certfile){ return new X509CertImpl(new FileInputStream(new File(certfile))).getPublicKey();
Obtener la clave privada es más complicado, puede:
public static PrivateKey getPrivateKeyFromKeyFile(final String keyfile){ try { Process p; p = Runtime.getRuntime().exec("openssl pkcs8 -nocrypt -topk8 -inform PEM " + "-in " + keyfile + " -outform DER -out " + keyfile + ".der"); p.waitFor(); System.out.println("Command executed" + (p.exitValue() == 0 ? " successfully" : " with error" )); } catch ( IOException | InterruptedException e) { e.printStackTrace(); System.exit(1); } PrivateKey myPrivKey = null; try { byte[] keyArray = Files.readAllBytes(Paths.get(keyfile + ".der")); PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyArray); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); myPrivKey = keyFactory.generatePrivate(keySpec); } catch (IOException | NoSuchAlgorithmException | InvalidKeySpecException e){ e.printStackTrace(); System.exit(1); } return myPrivKey; }
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Leer la clave pública de pem (PK o Cert). Depende de Bouncycastle.
private static PublicKey getPublicKeyFromPEM(Reader reader) throws IOException { PublicKey key; try (PEMParser pem = new PEMParser(reader)) { JcaPEMKeyConverter jcaPEMKeyConverter = new JcaPEMKeyConverter(); Object pemContent = pem.readObject(); if (pemContent instanceof PEMKeyPair) { PEMKeyPair pemKeyPair = (PEMKeyPair) pemContent; KeyPair keyPair = jcaPEMKeyConverter.getKeyPair(pemKeyPair); key = keyPair.getPublic(); } else if (pemContent instanceof SubjectPublicKeyInfo) { SubjectPublicKeyInfo keyInfo = (SubjectPublicKeyInfo) pemContent; key = jcaPEMKeyConverter.getPublicKey(keyInfo); } else if (pemContent instanceof X509CertificateHolder) { X509CertificateHolder cert = (X509CertificateHolder) pemContent; key = jcaPEMKeyConverter.getPublicKey(cert.getSubjectPublicKeyInfo()); } else { throw new IllegalArgumentException("Unsupported public key format '" + pemContent.getClass().getSimpleName() + '"'); } } return key; }
Leer la clave privada de PEM:
private static PrivateKey getPrivateKeyFromPEM(Reader reader) throws IOException { PrivateKey key; try (PEMParser pem = new PEMParser(reader)) { JcaPEMKeyConverter jcaPEMKeyConverter = new JcaPEMKeyConverter(); Object pemContent = pem.readObject(); if (pemContent instanceof PEMKeyPair) { PEMKeyPair pemKeyPair = (PEMKeyPair) pemContent; KeyPair keyPair = jcaPEMKeyConverter.getKeyPair(pemKeyPair); key = keyPair.getPrivate(); } else if (pemContent instanceof PrivateKeyInfo) { PrivateKeyInfo privateKeyInfo = (PrivateKeyInfo) pemContent; key = jcaPEMKeyConverter.getPrivateKey(privateKeyInfo); } else { throw new IllegalArgumentException("Unsupported private key format '" + pemContent.getClass().getSimpleName() + '"'); } } return key; }
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Java admite el uso de DER para claves públicas y privadas listas para usar (que es básicamente lo mismo que PEM, como pide el OP, excepto que los archivos PEM contienen datos base 64 más líneas de encabezado y pie de página).
Puede confiar en este código (manejo de excepciones de módulo) sin ninguna biblioteca externa si está en Java 8+ (esto supone que sus archivos clave están disponibles en la ruta de clase):
class Signer { private KeyFactory keyFactory; public Signer() { this.keyFactory = KeyFactory.getInstance("RSA"); } public PublicKey getPublicKey() { byte[] publicKey = readFileAsBytes("public-key.der"); X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKey); return keyFactory.generatePublic(keySpec); } public PrivateKey getPrivateKey() { byte[] privateKey = readFileAsBytes("private-key.der"); PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(privateKey); return keyFactory.generatePrivate(keySpec); } private URI readFileAsBytes(String name) { URI fileUri = getClass().getClassLoader().getResource(name).toURI(); return Files.readAllBytes(Paths.get(fileUri)); } }
Para el registro, puede convertir una clave PEM en una clave DER con el siguiente comando:
$ openssl pkcs8 -topk8 -inform PEM -outform DER -in private-key.pem -out private-key.der -nocrypt
Y obtenga la clave pública en DER con:
$ openssl rsa -in private-key.pem -pubout -outform DER -out public-key.der
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Si un PEM contiene solo una clave privada RSA sin cifrado, debe ser una estructura de secuencia ASN.1 que incluya 9 números para presentar una clave del teorema del resto chino (CRT):
Podemos implementar un
RSAPrivateCrtKey
:class RSAPrivateCrtKeyImpl implements RSAPrivateCrtKey { private static final long serialVersionUID = 1L; BigInteger n, e, d, p, q, dp, dq, qinv; @Override public BigInteger getModulus() { return n; } @Override public BigInteger getPublicExponent() { return e; } @Override public BigInteger getPrivateExponent() { return d; } @Override public BigInteger getPrimeP() { return p; } @Override public BigInteger getPrimeQ() { return q; } @Override public BigInteger getPrimeExponentP() { return dp; } @Override public BigInteger getPrimeExponentQ() { return dq; } @Override public BigInteger getCrtCoefficient() { return qinv; } @Override public String getAlgorithm() { return "RSA"; } @Override public String getFormat() { throw new UnsupportedOperationException(); } @Override public byte[] getEncoded() { throw new UnsupportedOperationException(); } }
Luego lea la clave privada de un archivo PEM:
import sun.security.util.DerInputStream; import sun.security.util.DerValue; static RSAPrivateCrtKey getRSAPrivateKey(String keyFile) { RSAPrivateCrtKeyImpl prvKey = new RSAPrivateCrtKeyImpl(); try (BufferedReader in = new BufferedReader(new FileReader(keyFile))) { StringBuilder sb = new StringBuilder(); String line; while ((line = in.readLine()) != null) { // skip "-----BEGIN/END RSA PRIVATE KEY-----" if (!line.startsWith("--") || !line.endsWith("--")) { sb.append(line); } } DerInputStream der = new DerValue(Base64. getDecoder().decode(sb.toString())).getData(); der.getBigInteger(); // 0 prvKey.n = der.getBigInteger(); prvKey.e = der.getBigInteger(); // 65537 prvKey.d = der.getBigInteger(); prvKey.p = der.getBigInteger(); prvKey.q = der.getBigInteger(); prvKey.dp = der.getBigInteger(); prvKey.dq = der.getBigInteger(); prvKey.qinv = der.getBigInteger(); } catch (IllegalArgumentException | IOException e) { logger.warn(keyFile + ": " + e.getMessage()); return null; } }
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