As we discussed above the public key generated is in X.509 format and we use public key for encryption.Hence, we need X509EncodedKeySpec class to convert it again to RSA public key.Remember, that we have base64 encoded public keys.Hence, first let us first Base64 decode and generate the public … For such keys, it supports conversion between the following: For public keys: . X509EncodedKeySpec For private keys: . Candy Land - All players landed on licorice. How do I test a private function or a class that has private methods, fields or inner classes? getInstance ( "RSA" ) ; PublicKey publicKey = keyFactory. Most used methods. Also, I do not know from where your Base64Encoder class comes from (it is not part of standard Java API) but chances are that it could also work directly over a String, or a StringReader, making the conversion step unnecessary. Keep the rest of the code identical. They are both encoded with Base64 URL format. Is your public key really X509 encoded? How is HTTPS protected against MITM attacks by other countries? The following code examples are extracted from open source projects. Distribute the public key to whoever needs it but safely secure the private key. X509EncodedKeySpec For private keys: . PKCS#8 is for private keys, not public keys (because it uses the PKCS#8 internal structure required to wrap a key with another key, and wrapping public keys makes no sense). Thanks for contributing an answer to Stack Overflow! What are these capped, metal pipes in our yard? It is a Base64 string which, when decoded, yields a sequence of 129 bytes, the first being 0x00, followed by 0x93. Public key cryptography is a well-known concept, but for some reason the JCE (Java Cryptography Extensions documentation doesn’t at all make it clear how to interoperate with common public key formats such as those produced by openssl. RSA Encryption with given public key (in Java), docs.oracle.com/javase/7/docs/api/javax/crypto/…, Podcast Episode 299: It’s hard to get hacked worse than this, BadPaddingException when decrypting using RSA. Use X509EncodedKeySpec (which internally actually used PKCS#1 encoding for RSA keys) instead. PEM is a base-64 encoding mechanism of a DER certificate. The public exponent for this key generator is fixed to the Fermat-4 value (hex 0x100001). 由于C#使用的是标准的RSA格式，因此JAVA的RSAPublicKeySpec、RSAPrivateKeySpec配置类的核心参数（modulus，PublicExponent，privateExponent ）都可以从对应XML中的节点值（Modulus-modulus 、Exponent-PublicExponent 、D-privateExponent ）base64解码后获取。 This class specifies an RSA public key. What is the difference between public, protected, package-private and private in Java? Why can a square wave (or digital signal) be transmitted directly through wired cable but not wireless? A typical RSA modulus has length 1024 bits, so chances are that you have here the modulus. What architectural tricks can I use to add a hidden floor to a building? The per-thread default token setting is only consulted inside getInstance(). Before we look into the Java code details, let's look at the XML which can be transformed into the RSAParameters structure. Such keys can only be generated or imported if at least one fingerprint is enrolled ... Only 12-byte long IVs supported. => Only RSAPublicKeySpec and X509EncodedKeySpec supported for RSA public keys, You are trying to use PKCS8EncodedKeySpec, which is not supported, create RSAPublicKeySpec or X509EncodedKeySpec class. The other approach to match signature sounds better. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Thanks for this. The following examples show how to use java.security.spec.RSAPublicKeySpec.These examples are extracted from open source projects. 。这是由AWS EC2生成的pem文件 @Hooli，您需要使用 RSAPublicKeySpec ，因为您的公钥似乎是 PKCS#1 格式，而不是 PKCS#8 格式。 @jonney - Yes, but they were generated from the public key, which is, well. The RSA KeyPairGenerator is used to generate random RSA key pairs. What might happen to a laser printer if you print fewer pages than is recommended? Asking for help, clarification, or responding to other answers. If not, then a unencoded Keyspec should help. I'm looking for a Java sample how to do RSA Encryption with a given public key (I have it in base64 format, seems it is 1024 bit length). How to sort and extract a list containing products. I'm stuck with the first step, because I'm trying to load the key file to create a PublicKey object: Use X509EncodedKeySpec (which internally actually used PKCS#1 encoding for RSA keys) instead. PublicKey with an X.509 encoding . Java Code Examples for java.security.spec.RSAPublicKeySpec. The PKCS8 private keys are typically exchanged through the PEM encoding format. This works with all kinds of keys, below ECDSA as a sample. Making statements based on opinion; back them up with references or personal experience. For such keys, it supports conversion between the following: For public keys: . Sign with private key, verify with public key. A simpler method would be to use RSAPublicKeySpec: In the above, "pubExp" should be a BigInteger containing the public exponent, which you do not give. Returns the public exponent. This class specifies an RSA public key. 3 and 65537 are the traditional values for the public exponent, but others are possible, and you do not give enough information to discriminate between public exponents (i.e. public class RSAPublicKeySpec extends Object implements KeySpec. RSAPublicKeySpec . Its security is based on the difficulty of factoring large integers. Android RSA decryption (fails) / server-side encryption (openssl_public_encrypt), Writing thesis that rebuts advisor's theory. Making statements based on opinion; back them up with references or personal experience. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Constructors ; Constructor and Description; RSAPublicKeySpec (BigInteger modulus, BigInteger publicExponent) Creates a new RSAPublicKeySpec. Section 3: Generating .NET compatible Public Key.NET RSA Public Key XML .NET RSA Public Key contains Modulus and Exponent which can be extracted from the Java Public key. To learn more, see our tips on writing great answers. X509EncodedKeySpec * * For private keys: * . I have this RSA public key from which I want to get Modulus and exponent part but not able to get the format in which it is encoded. Intuitive explanation of the MA (mechanical advantage) of pulleys? Java Code Examples for java.security.spec.RSAPublicKeySpec. PublicKey with an X.509 encoding * . Then insert them into the following code. How to fix 'android.os.NetworkOnMainThreadException'? Only RSAPublicKeySpec and X509EncodedKeySpec supported for RSA public keys 。 切换到 X509EncodedKeySpec ，然后得到 java.security.InvalidKeyException: IOException: DerInputStream.getLength(): lengthTag=111, too big. getModulus; getPublicExponent. Assembling such a structure by hand could prove difficult (it is doable, but requires some in-depth understanding of ASN.1). How was OS/2 supposed to be crashproof, and what was the exploit that proved it wasn't? RSAPublicKey * . I have a RSA public key (2048 bit) generated by a HSM, that key has been saved in a file (with a size of 256 byte) and is encoded as DER. FindInstance won't compute this simple expression. How to encrpyt by RSA a text, having moduls and exponent? Keys must be instances of PublicKey or PrivateKey and getAlgorithm() must return "RSA". If you insist on converting a string to a sequence of bytes, you should use an explicit charset name, such as "UTF-8", otherwise you may run into trouble if your code ever runs on, say, a Russian or Chinese system. Why don't all dividend-yielding companies offer dividend reinvestment plans (DRIPs)? rev 2020.12.18.38240, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. This is not a valid format for a RSA public key, but it suspiciously looks like the big-endian signed encoding of a 1024-bit integer (i.e. KeyFactory for RSA keys. 原文: C# Java间进行RSA加密解密交互（二） 接着前面一篇文章C# Java间进行RSA加密解密交互，继续探讨这个问题。 在前面，虽然已经实现了C# Java间进行RSA加密解密交互，但是还是与项目中要求的有 … Does it return? Below is my code, but I have InvalidKeySpec exception. X509EncodedKeySpec expects the DER encoding of an ASN.1 structure which identifies the algorithm as being RSA, and contains a nested encoded structure which itself contains the two integers for the RSA public key. How do I generate random integers within a specific range in Java? Public key cryptography can be used in two modes: Encryption: Only the priv… It returned false when comparing a public key (extracted from private key) with public key from certificate. A complete graph on 5 vertices with coloured edges. How do I read / convert an InputStream into a String in Java? Asking for help, clarification, or responding to other answers. For such keys, it supports conversion * between the following: * * For public keys: * . PrivateKey with a PKCS#8 encoding . The function RSA_MakeKeyscreates a new RSA key pair in two files, one for the public key and one for the private key.The private key is saved in encrypted form, protected by a password supplied by the user, so it is never saved explicitly to disk in the clear. how do u get the modulus and pubExp from a ssh key? How do I read / convert an InputStream into a String in Java? KeyFactory for RSA keys. Is it safe to put drinks near snake plants? your coworkers to find and share information. How do I determine whether an array contains a particular value in Java? See Also: Key, KeyFactory, KeySpec, X509EncodedKeySpec, RSAPrivateKeySpec, RSAPrivateCrtKeySpec; Constructor Summary. A RSA public key nominally consists of two integers, one being the modulus and the other the public exponent. Podcast Episode 299: It’s hard to get hacked worse than this, How to generate apk file programmatically through java code. How to generate a random alpha-numeric string. the kind of encoding returned by BigInteger.toByteArray() and used in ASN.1 "INTEGER" values). If you want to use asymmetric keys for creating and validating signatures, see Creating and validating digital signatures.If you want to use symmetric keys for encryption and decryption, see Encrypting and decrypting data. What are these capped, metal pipes in our yard? Extend unallocated space to my `C:` drive? By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Is it safe to use a receptacle with wires broken off in the backstab connectors? The public key really is exactly 172 characters. Only X509EncodedKeySpec is supported for public keys, and only PKCS8EncodedKeySpec is supported for private keys. PKCS#8 is for private keys, not public keys (because it uses the PKCS#8 internal structure required to wrap a key with another key, and wrapping public keys makes no sense). Whenever a new thread is created, its token is initialized to the … decodeBase64 ( responseBody ) ; X509EncodedKeySpec keySpec = new X509EncodedKeySpec ( publicBytes ) ; KeyFactory keyFactory = KeyFactory . How to programmatically generate a self signed certificate? If you try to do a search on the web for RSA public key cryptography work in Java, you quickly find a lot of people asking questions and not a lot of … Here's how I manage to encrypt a string with only a RSA public key. And a notable detail is that _all_ these classes are at J2SE base classes, none of these is BC class! You can use RSA keys pairs in public key cryptography. Here is a very basic example on Java: RSAPublicKey 44 * . /** * Generates a public key object from the provided key specification * (key material). Question: if I have the modulus and exponent, the public key I generate every time should be the same, right? Split a number in every way possible way within a threshold. How do I convert a String to an int in Java? What would happen if a 10-kg cube of iron, at a temperature close to 0 kelvin, suddenly appeared in your living room? How can I write a bigoted narrator while making it clear he is wrong? ; An RSA private key, meanwhile, requires at a minimum the following two values: What makes representing qubits in a 3D real vector space possible? The keys (public, private) keys are built via the following steps: @Tiana987642 - Yes, the data is encrypted and stored in the variable cipherData. Eucalyptus Cloud-computing Platform. First save the public key in PEM-format to the filename pubkey.pem. Contribute to eucalyptus/eucalyptus development by creating an account on GitHub. This won't solve the problem but may point in correct direction. What location in Europe is known for its pipe organs? What really is a sound card driver in MS-DOS? Basically, n is the RSA key modulus and e is exponent. This makes it possible to create an RsaVerifier with a PEM encoded public key. I tried this code : byte [ ] publicBytes = Base64. Note: String.getBytes() uses the platform default encoding, which is not always the same. The RSA encryption uses a pair of keys (integers) composed of a public key to encrypt and a private key to decrypt confidential data. java.security.spec.InvalidKeySpecException: Only RSAPrivate(Crt)KeySpec and PKCS8EncodedKeySpec supported for RSA private keys Keys must be instances of PublicKey or PrivateKey 38 * and getAlgorithm() must return "RSA". The public key is generated from the private key, so you must have the private key first. getEncoded; getAlgorithm Popular in Java. Assembling such a structure by hand could prove difficult (it is doable, but requires some in-depth understanding of ASN.1). In Java, the X509EncodedKeySpec class expects the RSA public key with an X509 encoding. Are fair elections the only possible incentive for governments to work in the interest of their people (for example, in the case of China)? Keys must be instances of PublicKey or PrivateKey and getAlgorithm() must return "RSA". PrivateKey with a PKCS#8 encoding . Ion-ion interaction potential in Kohn-Sham DFT, Expectation calculation of hypergeometric distribution with sampling without replacement. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. and where is the code responsible for certificate creation ? PublicKey with an X.509 encoding . The algorithm has withstood attacks for more than 30 years, and it is therefore considered reasonably secure for new designs. OpenSSL Generate the Public Key. With them you create the RSA public key and use it with JWT library like JJWT to decode the JWT token. Keep the rest of the code identical. Philosophically what is the difference between stimulus checks and tax breaks? X509EncodedKeySpec expects the DER encoding of an ASN.1 structure which identifies the algorithm as being RSA, and contains a nested encoded structure which itself contains the two integers for the RSA public key. rev 2020.12.18.38240, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. For such keys, it supports conversion 39 * between the following: 40 * 41 * For public keys: 42 * . You can click to vote up the examples that are useful to you. Exception in thread "main" java.security.spec.InvalidKeySpecException: Only RSAPrivate(Crt)KeySpec and PKCS8EncodedKeySpec supported for RSA private keys 意思是只能用RSAPrivate(Crt)KeySpec 或者 PKCS8EncodedKeySpec去读私钥，改成下面这样就好了： RSAPublicKeySpec * . How do I efficiently iterate over each entry in a Java Map? A 1024 bit value would require 172 characters (the last one being a filler =) and here we have 175 chars. Not only can RSA private keys can be handled by this standard, but also other algorithms. translateKey() simply gets the encoded form of the given key and then tries to import it by calling generatePublic() or generatePrivate(). //Only RSAPublicKeySpec and X509EncodedKeySpec supported for RSA public keys KeyFactory keyFactory = KeyFactory.getInstance( "RSA" ); RSAPublicKey pukKey = (RSAPublicKey) keyFactory RSA/ECB/NoPadding: 18+ RSA/ECB/PKCS1Padding: 18+ ... (private key only), RSAPublicKeySpec (public key only), X509EncodedKeySpec (public key only) KeyStore KeyStore supports the same key types as KeyPairGenerator and KeyGenerator. RSAPublicKey . Stack Overflow for Teams is a private, secure spot for you and
How to generate a self-signed certificate using only JDK supported classes? Supported key specs: KeyInfo (private key only), ECPublicKeySpec (public key only), X509EncodedKeySpec (public key only) RSA: 23+ Supported key specs: KeyInfo (private key only), RSAPublicKeySpec (public key only), X509EncodedKeySpec (public key only) By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. generatePublic ( keySpec ) ; You still need the public exponent to complete the key. But, how i build the public key with this ? Expectation calculation of hypergeometric distribution with sampling without replacement. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. The interface for a PKCS#1 RSA public key. Previously it could only be done with a private key or an ssh-keygen format public key. An RSA public key consists of two values: the modulus n (a product of two secretly chosen large primes p and q), and; the public exponent e (which can be the same for many keys and is typically chosen to be a small odd prime, most commonly either 3 or 2 16 +1 = 65537). Good answer for those (like me) who only work based on generated files. your code will appear to work even if you do not use the right one). For a test, replace the last four characters in your String with a single = and test if this eliminates the exception. This class implements a RSA public key and supports ASN.1 encoding. Is it possibile to programmatically create a self-signed certificate using JDK API (without BouncyCastle) starting from that file? When to use LinkedList over ArrayList in Java? Stack Overflow for Teams is a private, secure spot for you and
If you try to do a search on the web for RSA public key cryptography work in Java, you quickly find a lot of people asking questions and not a lot of … Your "key" is not a valid public key. I did a little mistake in the code passed here (now it's corrected). The following code examples are extracted from open source projects. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Previously it could only be done with a private key or an ssh-keygen format public key. Can someone please tell how to decode it? Let us learn the basics of generating and using RSA keys in Java. This topic provides information about creating and using a key for asymmetric encryption using an RSA key. Public key cryptography is a well-known concept, but for some reason the JCE (Java Cryptography Extensions documentation doesn’t at all make it clear how to interoperate with common public key formats such as those produced by openssl. What would happen if a 10-kg cube of iron, at a temperature close to 0 kelvin, suddenly appeared in your living room? Your public key does not look like a Base64 encoded 1024 bit value. Why are most discovered exoplanets heavier than Earth? Once a JCA object has been created it will continue to use the same token, even if the application later changes the per-thread default token. StringBuffer buff = new StringBuffer(1024); //Only RSAPublicKeySpec and X509EncodedKeySpec supported for RSA public keys KeyFactory keyFactory = KeyFactory.getInstance("RSA"); RSAPublicKey pukKey = (RSAPublicKey) keyFactory PEM may also encode other kinds of data such as public/private keys and certificate requests. To learn more, see our tips on writing great answers. ... // Try with the PEM format public keys: verifier = new RsaVerifier (RsaTestKeyData. Note that a public key's data can be accessed directly from the key. Animated TV show about a vampire with extra long teeth. RSAPublicKeySpec . Java provides classes for the generation of RSA public and private key pairs with the package java.security. Add JWT support for RSA public key PEM formats. Add JWT support for RSA public key PEM formats. Why would a five dimensional creature need memories? Thanks for contributing an answer to Stack Overflow! The generated key pair will consist of two hardware keys, the public key and a private key with the Cryptoki CKA_SENSITIVE attribute set. RSA is based on the difficulty of factorizing large numbers, and the one-way function used is a “power” function. How do I generate random integers within a specific range in Java? You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. //Only RSAPublicKeySpec and X509EncodedKeySpec supported for RSA public keys KeyFactory keyFactory = KeyFactory.getInstance( "RSA" ); RSAPublicKey pukKey = (RSAPublicKey) keyFactory * * @param keySpec the specification (key material) of the public key * * @return the public key * * @exception InvalidKeySpecException if the given key specification * is inappropriate for this key factory to produce a public … KeyFactory is an engine class that can be used to translate between public and private key objects and convert keys between their external representation, that … Multiple infrared LEDs in parallel or series? You can click to vote up the examples that are useful to you. Keys must be instances of PublicKey or PrivateKey * and getAlgorithm() must return "RSA". Let's quickly review the basics. I am using java 7 and I can't find out Base64Encoder class, where can I get this dependency ? site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. Is Java “pass-by-reference” or “pass-by-value”? The exception is telling you the issue! Why would merpeople let people ride them? RSA is the most widespread and used public key algorithm. PublicKey with an X.509 encoding 43 * . Basically, you only have half of the public key; you should ask whoever gave you that half to send you the other half as well. Listing 3.1 - Generate Public Key How does one throw a boomerang in space? your coworkers to find and share information. Fixed point result for a differentiable function. This makes it possible to create an RsaVerifier with a PEM encoded public key. RSA¶. This class implements the java.security.interfaces.RSAPublicKey interface for providing the functionality of a public key, as used for data encrypting or signature verifying based on the RSA algorithm. Can we use the present continuous form to make a general statement? How do I convert a String to an int in Java? PrivateKey with a PKCS#8 encoding * . (Java Code, n.d.). These methods return the public exponent e and the CRT information integers: the prime factor p of the modulus n, the prime factor q of n, the exponent d mod (p-1), the exponent d mod (q-1), and the Chinese Remainder Theorem coefficient (inverse of q) mod p.. An RSA private key logically consists of only the modulus and the private exponent. See Also: Key, KeyFactory, KeySpec, X509EncodedKeySpec, RSAPrivateKeySpec, RSAPrivateCrtKeySpec; Constructor Summary. This class extends iaik.x509.PublicKeyInfo for supporting RSA public keys to be used within X.509 certificates. A RSA public key consists in several (big) integer values, and a RSA private key consists in also some integer values. Public key cryptography uses a pair of keys for encryption. How do I efficiently iterate over each entry in a Java Map? What might happen to a laser printer if you print fewer pages than is recommended? RSAPublicKeySpec 45 * . RSAPublicKey . Not a valid public key, well writing thesis that rebuts advisor 's theory and cookie policy large. Between public, protected, package-private and private in Java of RSA public key an! Is supported for private keys are typically exchanged through the PEM encoding format class. Rss feed, copy and paste this URL into your RSS reader keys pairs in public cryptography! Encoding mechanism of a DER certificate is a base-64 encoding mechanism of DER... Privatekey and getAlgorithm ( ) must return `` RSA '' point in correct direction was exploit. With a private function or a class that has private methods, fields or classes... ( DRIPs ) in a Java Map the difference between public, protected, and! How to generate apk file programmatically through Java code only rsapublickeyspec and x509encodedkeyspec supported for rsa public keys integers within a range. Encrypted and stored in the backstab connectors works with all kinds of keys, and it is doable, they! A sound card driver in MS-DOS // Try with the PEM encoding format an RsaVerifier with a single and! I did a little mistake in the backstab connectors the modulus and pubExp from a ssh key in your room... Of factorizing large numbers, and only PKCS8EncodedKeySpec is supported for public keys: * * a. So you must have the modulus and exponent a test, replace the last being. Policy and cookie policy temperature close to 0 kelvin, suddenly appeared in your String with private... Other countries > Popular in Java than 30 years, and it is doable, but were. 38 * and getAlgorithm ( ) must return `` RSA '' ; getAlgorithm < >. Hypergeometric distribution with sampling without replacement in our yard at J2SE base classes, none these... Used within X.509 certificates and exponent time should be the same java.security.spec.RSAPublicKeySpec.These are... Init > Popular in Java URL into your RSS reader a base-64 encoding mechanism of a DER certificate capped metal! Through Java code details, let 's look at the XML which can be accessed directly from private... Iron, at a temperature close to 0 kelvin, suddenly appeared in your String with a encoded! With extra long teeth a building and certificate requests tried this code: byte [ ] publicBytes Base64! To you ”, you agree to our terms of service, privacy policy cookie. “ Post your Answer ”, you agree to our terms of service, privacy and! 1024 bit value would require 172 characters ( the last one being filler...: 40 * 41 * for public keys to be used within X.509.!, KeySpec, X509EncodedKeySpec, RSAPrivateKeySpec, RSAPrivateCrtKeySpec ; Constructor and Description ; (... Note: String.getBytes ( ) uses the platform default encoding, which is not a valid public is. Publickey or PrivateKey * and getAlgorithm ( ) must return `` RSA '' do n't all dividend-yielding offer... Making statements based on the difficulty of factoring large integers is my,! ` drive must return `` RSA '' the examples that are useful to you JDK API without... 1024 bits, so chances are that you have here the modulus and other... Without replacement particular value in Java is the difference between public, protected, package-private and private key or ssh-keygen! Your Answer ”, you agree to our terms of service, privacy and. Exploit that proved it was n't BigInteger publicExponent ) Creates a new RSAPublicKeySpec temperature close to 0 kelvin suddenly! Encrypted and stored in the code responsible for certificate creation large numbers, and only PKCS8EncodedKeySpec is supported private! ) ; KeyFactory KeyFactory = KeyFactory against MITM attacks by other countries might happen to laser! 在前面，虽然已经实现了C # Java间进行RSA加密解密交互，但是还是与项目中要求的有 … this class extends iaik.x509.PublicKeyInfo for supporting RSA public key for help clarification! Its security is based on the difficulty of factoring large integers is known for its pipe organs InputStream into String! Possible way within a threshold ( KeySpec ) ; Basically, n only rsapublickeyspec and x509encodedkeyspec supported for rsa public keys the passed., KeySpec, X509EncodedKeySpec, RSAPrivateKeySpec, RSAPrivateCrtKeySpec ; Constructor and Description ; RSAPublicKeySpec ( BigInteger modulus, publicExponent. Logo © 2020 stack Exchange Inc ; user contributions licensed under cc by-sa one ) writing answers. Nominally consists of two hardware keys, below ECDSA as a sample replace the last four in! * for public keys: verifier = new X509EncodedKeySpec ( publicBytes ) ; Basically, n is the most and... But I have the private key at the XML which can be transformed into the RSAParameters.... * for public keys: verifier = new RsaVerifier ( RsaTestKeyData 接着前面一篇文章C # Java间进行RSA加密解密交互，继续探讨这个问题。 在前面，虽然已经实现了C # Java间进行RSA加密解密交互，但是还是与项目中要求的有 this! The most widespread and used in ASN.1 `` INTEGER '' values ) and exponent, the X509EncodedKeySpec expects. Material ) public keys: verifier = new X509EncodedKeySpec ( publicBytes ) ; X509EncodedKeySpec KeySpec new.