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  • Get private SecKeyRef from DER file?

    - by Alexander Parfyanovich
    In my iPhone project I have used this solution to encrypt data with DER encoded certificate, which was generated by openssl commands like this: openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout privateKey.pem -out cert.pem openssl x509 -outform der -in cert.pem -out cert.der openssl rsa -in privateKey.pem -outform DER -out privateKey.der And now I want to decrypt data using private key file. How can I get the private SecKeyRef instance from DER encoded private key file?

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  • How to read a password encrypted key with java?

    - by Denis
    Hi, This is very simple question. I have private key stored in file in PKCS8 DER format and protected by password. What is the easiest way to read it? Here is the code I use to load unencrypted one: InputStream in = new FileInputStream(privateKeyFilename); byte[] privateKeydata = new byte[in.available()]; in.read(privateKeydata); in.close(); KeyFactory privateKeyFactory = KeyFactory.getInstance("RSA"); PKCS8EncodedKeySpec encodedKeySpec = new PKCS8EncodedKeySpec(privateKeydata); PrivateKey privateKey = privateKeyFactory.generatePrivate(encodedKeySpec); Please, Help!!!

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  • OpenSSL.NET can't export private key with null Cipher

    - by Nick
    I've recently discovered OpenSSL.NET and it's a pretty sweet little wrapper. I'm trying to execute the following code: public static void DoSomething(byte[] buf) { OpenSSL.Core.BIO input = new OpenSSL.Core.BIO(buf); OpenSSL.X509.X509Certificate b = OpenSSL.X509.X509Certificate.FromPKCS12(input, "passphrase"); OpenSSL.Core.BIO outs = OpenSSL.Core.BIO.MemoryBuffer(false); b.PrivateKey.WritePrivateKey(outs, OpenSSL.Crypto.Cipher.Null, "passphrase"); outs.SetClose(OpenSSL.Core.BIO.CloseOption.Close); Console.WriteLine(outs.ReadString()); } Problem comes at the "b.PrivateKey.WritePrivateKey(.." line. I want to write the private key out without any encryption. According to spec, if I use a Null cipher type this should do the trick, but it never works, regardless of the cert I use in buf. Here's the exception: error:0D0A706C:asn1 encoding routines:PKCS5_pbe2_set:cipher has no object identifier error:2307D00D:PKCS12 routines:PKCS8_encrypt:ASN1 lib I know this part works fine because if I specify any other cipher type, it exports the private key without fail. Anyone have any suggestions?

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  • how do i convert RSAParameters from .net to .pem file so i can use it in php

    - by netuser24
    Hello i have a private and public keys for RSA generated in .net in this format string privateKey = "<RSAKeyValue>" + "<Modulus>...kCFhsjB4xMW49mrx5B/Ga...</Modulus>" + "<Exponent>...</Exponent>" + "<P>...7bRCrQVgVIfXdTIH3iY8x...</P>" + "<Q>...4SiQDhrAZADuFDTr7bRCrQVgVIfXdTIH3iY8x...</Q>" + "<DP>...ZADuFDTr7bRCrQVgVIfXdT...</DP>" + "<DQ>...4SiQDhrAZADuFDTr...</DQ>" + "<InverseQ>...sjB4xMW49mrx5B/Ga...</InverseQ>" + "<D>...SiQDhrAZADuFDTr7bRCrQVgVIf...</D>" + "</RSAKeyValue>"; how can i convert this so i can use it in php openssl functions to encrypt and decrypt data? i need both public and private keys converted. maybe with openssl bash command in linux where can i specify my own modulus, exponent and so on? any ideas? thanks

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  • [C#] RSACryptoServiceProvider Using the Public Key to decrypt Private Key encrypted Data ?

    - by prixone
    Hello, i went thru lots and lots of searchs and results and pages considering this matter but havent found the solution yet. Like i described in the title i want to decrypt data using my Public Key which is something i am able to do with my PHP code, my certificate is generated from my PHP page. Here is a sample of what i am trying: public string Decrypt(string data) { X509Certificate2 cert = new X509Certificate2(); cert.Import(Encoding.ASCII.GetBytes(webApi["PublicDefaultKey"])); RSACryptoServiceProvider rsa = (RSACryptoServiceProvider)cert.PublicKey.Key; byte[] ciphertextBytes = Convert.FromBase64String(data); byte[] plaintextBytes = rsa.Decrypt(ciphertextBytes, false); return System.Text.Encoding.UTF8.GetString(plaintextBytes); } MessageBox.Show(Decrypt("pgcl93TpVfyHubuRlL72/PZN0nA4Q+HHx8Y15qGvUyTNpI6y7J13YG07ZVEyB7Dbgx63FSw9vEw1D1Z3bvNbI0gqalVfKTfHv5tKVc7Y6nQwQYwoODpUhVpa/K9OP1lqx4esnxqwJx95G0rqgJTdS+Yo773s5UcJrHzzbsX2z+w=")); here is the public key i am using for tests: -----BEGIN CERTIFICATE----- MIIDxDCCAy2gAwIBAgIBADANBgkqhkiG9w0BAQUFADCBozELMAkGA1UEBhMCVUsx EDAOBgNVBAgTB0VuZ2xhbmQxDzANBgNVBAcTBkxvbmRvbjESMBAGA1UEChMJTU1P Q2xldmVyMSMwIQYDVQQLExpNTU9DbGV2ZXIgRGV2ZWxvcGVyJ3MgVGVhbTESMBAG A1UEAxMJTU1PQ2xldmVyMSQwIgYJKoZIhvcNAQkBFhVzdXBwb3J0QG1tb2NsZXZl ci5jb20wHhcNMTAwNTE2MTkxNDQ4WhcNMTEwNTE2MTkxNDQ4WjCBozELMAkGA1UE BhMCVUsxEDAOBgNVBAgTB0VuZ2xhbmQxDzANBgNVBAcTBkxvbmRvbjESMBAGA1UE ChMJTU1PQ2xldmVyMSMwIQYDVQQLExpNTU9DbGV2ZXIgRGV2ZWxvcGVyJ3MgVGVh bTESMBAGA1UEAxMJTU1PQ2xldmVyMSQwIgYJKoZIhvcNAQkBFhVzdXBwb3J0QG1t b2NsZXZlci5jb20wgZ8wDQYJKoZIhvcNAQEBBQADgY0AMIGJAoGBAMozHr17PL+N seZyadobUmpIV+RKqmRUGX0USIdj0i0yvwvltu3AIKAyRhGz16053jZV2WeglCEj qfiewF9sYTAAoIVGtdd/sZvO4uUcng9crSzDo0CrEPs/Tn5SunmlmyFlZfdlqpAM XXLno/HMo9cza0CrcMnRokaTiu8szBeBAgMBAAGjggEEMIIBADAdBgNVHQ4EFgQU zip+3/hBIpjvdcSoWQ2rW+xDEWAwgdAGA1UdIwSByDCBxYAUzip+3/hBIpjvdcSo WQ2rW+xDEWChgamkgaYwgaMxCzAJBgNVBAYTAlVLMRAwDgYDVQQIEwdFbmdsYW5k MQ8wDQYDVQQHEwZMb25kb24xEjAQBgNVBAoTCU1NT0NsZXZlcjEjMCEGA1UECxMa TU1PQ2xldmVyIERldmVsb3BlcidzIFRlYW0xEjAQBgNVBAMTCU1NT0NsZXZlcjEk MCIGCSqGSIb3DQEJARYVc3VwcG9ydEBtbW9jbGV2ZXIuY29tggEAMAwGA1UdEwQF MAMBAf8wDQYJKoZIhvcNAQEFBQADgYEAyU6RLifBXSyQUkBFnTcI6h5ryujh+6o6 eQ1wuPOPmRdYJZuWx/5mjMpIF13sYlNorcOv5WaEnp8/Jfuwc9h/jXlcujser0UE WoaaFwK81O801Xkv2zEm2UUWiOabrGTIT4FVy3gCUXJYjaCnvfSdmkfLJOQxNHVt 4NTMp7IeF60= -----END CERTIFICATE----- by default, the PHP generates the key in PKCS as far as i know, from my C# code i can encrypt using my publick key with out any problems and decrypt it on my php page but so far i was not able to decrypt data sent from my php page encrypted with the private key which is something i can do on my php... i did like some help to understand what i am doing wrong... the error when i run the functions is "bad data" at rsa.Decrypt(ciphertextBytes, false); which i couldnt found anymore information at it... Thanks for any and all the help :)

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  • Confused about encryption with public and private keys (which to use for encryption)

    - by jax
    I am making a licensing system when clients ask my server for a license and I send them a license if they are permitted to have one. On my current system I encrypt the license using a single private key and have the public key embedded into the client application that they use to decrypt the license. It works! Others have told me that I should be encrypting with the public key on the server and distributing the private key to clients. I have searched the web and can see that sometimes they use the private key to encrypt and other times they use the public key to encrypt. In this case what am I supposed to do?

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  • Import .pem public and private keys to JKS keystore

    - by Rolf
    Hi, I have public and private keys in separate .pem files that I would need to get into a JKS keystore somehow. Tried using the -import command in KeyTool for this, which gives an "not an X.509 certificate" error. I'm guessing the solution has to do with OpenSSL, but I'm not entirely sure what to do with it. Would really appreciate any help with this, since I'm completely clueless with everything crypto-related. Thanks in advance, --Rolf

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  • Meet-in-the-Middle Atack on an NTRU Private key

    - by Elena Kirshanova
    Hello everyone. I was wondering if anyone could tell me how to represent the enumeration of vectors of privite key f in a Meet-In-the-Middle Attack on an NTRU Private key. I can not understand the example, given here http://securityinnovation.com/cryptolab/pdf/NTRUTech004v2.pdf I'll be very thankful if anyone could show an example in detail.

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  • How do I store a Java KeyStore password?

    - by Anthony D
    In my web application I access a private key that is stored in a Java KeyStore. I would like to know what is the best/recommended way to store the password for the KeyStore and private key. I've considered using a properties file but that does not seem very secure for use in a production environment (storing password in a plain text file). Also, hard-coding the password in my code is not an option I'm willing to entertain. Thanks.

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  • Is web.config more secure than a class?

    - by o-logn
    I was reading a tutorial on ASP.NET and third party API's and it mentioned that the API KEY and SECRET KEY should be stored in the web.config file, for security on production servers, instead of in the classes that use them. However, I'm not quite sure what's more secure about a web.config file than a class? I understand the convenience of storing it in a config file, but I don't see the security benefit?

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  • What exactly is a "key container"?

    - by saugata
    Is it something specific, with a definite structure, or just an arbitrary data file with some form of encryption to hold keys, and potentially other secret information? Can someone please explain the term or point me to a link.

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  • IIS 6 Private Key certificate access

    - by gaizkile
    Hi, We have a Web asp.net application running in the framework 2.0 and hosted in an IIS 6 server, and the OS is windows server 2003. The web application is suing a client certificate to be authenticated by a web service. We have impersonalized the application pool with de user “Network Service”. The problem is when we have to access to the private key of the certificate that is stored in the machine key/my storage. The user Network Service cannot access the key. We have given privileges to the Network Service user using the winhttpcertcfg.exe tool, however the result is the same. When we impersonalize the application pool with the local administrator the result is successfully. Therefore we think that the problem is the privileges of the user. If someone could give us some information about, we would be gratefully. Thanks in advance

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  • SSH Private Key Not Working in Some Directories

    - by uesp
    I have a strange issue where SSH won't properly connect with a private-key if the key file is in certain directories. I've setup the keys on a set of servers and the following command ssh -i /root/privatekey [email protected] works fine and I login to the given host without getting prompted by a password, but this command: ssh -i /etc/keyfiles/privatekey [email protected] gives me a password prompt. I've narrowed it down that this behavior occurs in only some sub-directories of /etc/. For example /etc/httpd1/ gives me a password prompt but /etc/httpd/ does not. What I've checked so far: All private key files used are identical (copied from the original file). The private key file and directories used have identical permissions. No relevant error messages in the server/client logs. No interesting debug messages from ssh -v (it just seems to skip the key file). It happens with connecting to different hosts. After more testing it is not the actual directory name. For example: mkdir /etc/test cp /root/privatekey /etc/test ssh -i /etc/test/privatekey [email protected] # Results in password prompt cp /root/privatekey /etc/httpd # Existing directory ls -ald test httpd # drwxr-xr-x 4 root root 4096 Mar 5 18:25 httpd # drwxr-xr-x 2 root root 4096 Mar 5 18:43 test ssh -i /etc/httpd/privatekey [email protected] # Results in *no* prompt rm -r test cp -R /etc/httpd /etc/test ssh -i /etc/test/privatekey [email protected] # Results in *no* prompt` I'm sure its just something simple I've overlooked but I'm at a loss.

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  • Help me clean up this crazy lambda with the out keyword

    - by Sarah Vessels
    My code looks ugly, and I know there's got to be a better way of doing what I'm doing: private delegate string doStuff( PasswordEncrypter encrypter, RSAPublicKey publicKey, string privateKey, out string salt ); private bool tryEncryptPassword( doStuff encryptPassword, out string errorMessage ) { ...get some variables... string encryptedPassword = encryptPassword(encrypter, publicKey, privateKey, out salt); ... } This stuff so far doesn't bother me. It's how I'm calling tryEncryptPassword that looks so ugly, and has duplication because I call it from two methods: public bool method1(out string errorMessage) { string rawPassword = "foo"; return tryEncryptPassword( (PasswordEncrypter encrypter, RSAPublicKey publicKey, string privateKey, out string salt) => encrypter.EncryptPasswordAndDoStuff( // Overload 1 rawPassword, publicKey, privateKey, out salt ), out errorMessage ); } public bool method2(SecureString unencryptedPassword, out string errorMessage) { return tryEncryptPassword( (PasswordEncrypter encrypter, RSAPublicKey publicKey, string privateKey, out string salt) => encrypter.EncryptPasswordAndDoStuff( // Overload 2 unencryptedPassword, publicKey, privateKey, out salt ), out errorMessage ); } Two parts to the ugliness: I have to explicitly list all the parameter types in the lambda expression because of the single out parameter. The two overloads of EncryptPasswordAndDoStuff take all the same parameters except for the first parameter, which can either be a string or a SecureString. So method1 and method2 are pretty much identical, they just call different overloads of EncryptPasswordAndDoStuff. Any suggestions? Edit: if I apply Jeff's suggestions, I do the following call in method1: return tryEncryptPassword( (encrypter, publicKey, privateKey) => { var result = new EncryptionResult(); string salt; result.EncryptedValue = encrypter.EncryptPasswordAndDoStuff( rawPassword, publicKey, privateKey, out salt ); result.Salt = salt; return result; }, out errorMessage ); Much the same call is made in method2, just with a different first value to EncryptPasswordAndDoStuff. This is an improvement, but it still seems like a lot of duplicated code.

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  • RSA decrypting data in C# (.NET 3.5) which was encrypted with openssl in php 5.3.2

    - by panny
    Maybe someone can clear me up. I have been surfing on this a while now. Step #1: Create a root certificate Key generation on unix 1) openssl req -x509 -nodes -days 3650 -newkey rsa:1024 -keyout privatekey.pem -out mycert.pem 2) openssl rsa -in privatekey.pem -pubout -out publickey.pem 3) openssl pkcs12 -export -out mycertprivatekey.pfx -in mycert.pem -inkey privatekey.pem -name "my certificate" Step #2: Does root certificate work on php: YES PHP side I used the publickey.pem to read it into php: $publicKey = "file://C:/publickey.pem"; $privateKey = "file://C:/privatekey.pem"; $plaintext = "123"; openssl_public_encrypt($plaintext, $encrypted, $publicKey); $transfer = base64_encode($encrypted); openssl_private_decrypt($encrypted, $decrypted, $privateKey); echo $decrypted; // "123" OR $server_public_key = openssl_pkey_get_public(file_get_contents("C:\publickey.pem")); // rsa encrypt openssl_public_encrypt("123", $encrypted, $server_public_key); and the privatekey.pem to check if it works: openssl_private_decrypt($encrypted, $decrypted, openssl_get_privatekey(file_get_contents("C:\privatekey.pem"))); echo $decrypted; // "123" Coming to the conclusion, that encryption/decryption works fine on the php side with these openssl root certificate files. Step #3: Does root certificate work on .NET: YES C# side In same manner I read the keys into a .net C# console program: X509Certificate2 myCert2 = new X509Certificate2(); RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(); try { myCert2 = new X509Certificate2(@"C:\mycertprivatekey.pfx"); rsa = (RSACryptoServiceProvider)myCert2.PrivateKey; } catch (Exception e) { } byte[] test = {Convert.ToByte("123")}; string t = Convert.ToString(rsa.Decrypt(rsa.Encrypt(test, false), false)); Coming to the point, that encryption/decryption works fine on the c# side with these openssl root certificate files. Step #4: Enrypt in php and Decrypt in .NET: !!NO!! PHP side $onett = "123" .... openssl_public_encrypt($onett, $encrypted, $server_public_key); $onettbase64 = base64_encode($encrypted); copy - paste $onettbase64 ("LkU2GOCy4lqwY4vtPI1JcsxgDgS2t05E6kYghuXjrQe7hSsYXETGdlhzEBlp+qhxzTXV3pw+AS5bEg9CPxqHus8fXHOnXYqsd2HL20QSaz+FjZee6Kvva0cGhWkFdWL+ANDSOWRWo/OMhm7JVqU3P/44c3dLA1eu2UsoDI26OMw=") into c# program: C# side byte[] transfered_onettbase64 = Convert.FromBase64String("LkU2GOCy4lqwY4vtPI1JcsxgDgS2t05E6kYghuXjrQe7hSsYXETGdlhzEBlp+qhxzTXV3pw+AS5bEg9CPxqHus8fXHOnXYqsd2HL20QSaz+FjZee6Kvva0cGhWkFdWL+ANDSOWRWo/OMhm7JVqU3P/44c3dLA1eu2UsoDI26OMw="); string k = Convert.ToString(rsa.Decrypt(transfered_onettbase64, false)); // Bad Data exception == Exception while decrypting!!! Any ideas?

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  • RSA Decrypting a string in C# which was encrypted with openssl in php 5.3.2

    - by panny
    maybe someone can clear me up. I have been surfing on this a while now. I used openssl from console to create a root certificate for me (privatekey.pem, publickey.pem, mycert.pem, mycertprivatekey.pfx). See the end of this text on how. The problem is still to get a string encrypted on the PHP side to be decrypted on the C# side with RSACryptoServiceProvider. Any ideas? PHP side I used the publickey.pem to read it into php: $server_public_key = openssl_pkey_get_public(file_get_contents("C:\publickey.pem")); // rsa encrypt openssl_public_encrypt("123", $encrypted, $server_public_key); and the privatekey.pem to check if it works: openssl_private_decrypt($encrypted, $decrypted, openssl_get_privatekey(file_get_contents("C:\privatekey.pem"))); Coming to the conclusion, that encryption/decryption works fine on the php side with these openssl root certificate files. C# side In same manner I read the keys into a .net C# console program: X509Certificate2 myCert2 = new X509Certificate2(); RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(); try { myCert2 = new X509Certificate2(@"C:\mycertprivatekey.pfx"); rsa = (RSACryptoServiceProvider)myCert2.PrivateKey; } catch (Exception e) { } string t = Convert.ToString(rsa.Decrypt(rsa.Encrypt(test, false), false)); coming to the point, that encryption/decryption works fine on the c# side with these openssl root certificate files. key generation on unix 1) openssl req -x509 -nodes -days 3650 -newkey rsa:1024 -keyout privatekey.pem -out mycert.pem 2) openssl rsa -in privatekey.pem -pubout -out publickey.pem 3) openssl pkcs12 -export -out mycertprivatekey.pfx -in mycert.pem -inkey privatekey.pem -name "my certificate"

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  • Decrypting a string in C# which was encrypted with openssl in php 5.3.2

    - by panny
    maybe someone can clear me up. I have been surfing on this a while now. I used openssl from console to create a root certificate for me (privatekey.pem, publickey.pem, mycert.pem, mycertprivatekey.pfx). See the end of this text on how. The problem is still to get a string encrypted on the PHP side to be decrypted on the C# side with RSACryptoServiceProvider. Any ideas? PHP side I used the publickey.pem to read it into php: $server_public_key = openssl_pkey_get_public(file_get_contents("C:\publickey.pem")); // rsa encrypt openssl_public_encrypt("123", $encrypted, $server_public_key); and the privatekey.pem to check if it works: openssl_private_decrypt($encrypted, $decrypted, openssl_get_privatekey(file_get_contents("C:\privatekey.pem"))); Coming to the conclusion, that encryption/decryption works fine on the php side with these openssl root certificate files. C# side In same manner I read the keys into a .net C# console program: X509Certificate2 myCert2 = new X509Certificate2(); RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(); try { myCert2 = new X509Certificate2(@"C:\mycertprivatekey.pfx"); rsa = (RSACryptoServiceProvider)myCert2.PrivateKey; } catch (Exception e) { } string t = Convert.ToString(rsa.Decrypt(rsa.Encrypt(test, false), false)); coming to the point, that encryption/decryption works fine on the c# side with these openssl root certificate files. key generation on unix 1) openssl req -x509 -nodes -days 3650 -newkey rsa:1024 -keyout privatekey.pem -out mycert.pem 2) openssl rsa -in privatekey.pem -pubout -out publickey.pem 3) openssl pkcs12 -export -out mycertprivatekey.pfx -in mycert.pem -inkey privatekey.pem -name "my certificate"

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  • Decrypting a string in C# 3.5 which was encrypted with openssl in php 5.3.2

    - by panny
    Hi everyone, maybe someone can clear me up. I have been surfing on this a while now. I used openssl from console to create a root certificate for me (privatekey.pem, publickey.pem, mycert.pem, mycertprivatekey.pfx). See the end of this text on how. The problem is still to get a string encrypted on the PHP side to be decrypted on the C# side with RSACryptoServiceProvider. Any ideas? PHP side I used the publickey.pem to read it into php: $server_public_key = openssl_pkey_get_public(file_get_contents("C:\publickey.pem")); // rsa encrypt openssl_public_encrypt("123", $encrypted, $server_public_key); and the privatekey.pem to check if it works: openssl_private_decrypt($encrypted, $decrypted, openssl_get_privatekey(file_get_contents("C:\privatekey.pem"))); Coming to the conclusion, that encryption/decryption works fine on the php side with these openssl root certificate files. C# side In same manner I read the keys into a .net C# console program: X509Certificate2 myCert2 = new X509Certificate2(); RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(); try { myCert2 = new X509Certificate2(@"C:\mycertprivatekey.pfx"); rsa = (RSACryptoServiceProvider)myCert2.PrivateKey; } catch (Exception e) { } string t = Convert.ToString(rsa.Decrypt(rsa.Encrypt(test, false), false)); coming to the point, that encryption/decryption works fine on the c# side with these openssl root certificate files. key generation on unix 1) openssl req -x509 -nodes -days 3650 -newkey rsa:1024 -keyout privatekey.pem -out mycert.pem 2) openssl rsa -in privatekey.pem -pubout -out publickey.pem 3) openssl pkcs12 -export -out mycertprivatekey.pfx -in mycert.pem -inkey privatekey.pem -name "my certificate"

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  • How to encrypt a RSAKey using another RSAKey?

    - by Tom Brito
    I know its not the usual thing to do. But the specification I'm implementing is discribed this way, and I cannot run out. I was trying to encrypt the modulus and exponent of the private key, but the following test code raises an exception because the byte array is 1 byte larger then the maximum allowed by RSA block: import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.NoSuchAlgorithmException; import java.security.NoSuchProviderException; import java.security.interfaces.RSAPrivateKey; import java.security.interfaces.RSAPublicKey; import javax.crypto.Cipher; import org.apache.commons.lang.ArrayUtils; public class TEST { public static KeyPair generateKeyPair() throws NoSuchAlgorithmException, NoSuchProviderException { KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA", "BC"); keyPairGenerator.initialize(1024); return keyPairGenerator.generateKeyPair(); } public static void main(String[] args) throws Exception { KeyPair keyPair = generateKeyPair(); RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); System.out.println("Priv modulus len = " + privateKey.getModulus().bitLength()); System.out.println("Priv exponent len = " + privateKey.getPrivateExponent().bitLength()); System.out.println("Priv modulus toByteArray len = " + privateKey.getModulus().toByteArray().length); byte[] byteArray = privateKey.getModulus().toByteArray(); // the byte at index 0 have no value (in every generation it is always zero) byteArray = ArrayUtils.subarray(byteArray, 1, byteArray.length); System.out.println("byteArray size: " + byteArray.length); RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); Cipher cipher = Cipher.getInstance("RSA", "BC"); cipher.init(Cipher.ENCRYPT_MODE, publicKey); byte[] encryptedBytes = cipher.doFinal(byteArray); System.out.println("Success!"); } } (obs. its just a test, i would never encrypt the private key with its pair public key) The byte array is 128 bytes, the exactly maximum allowed by a RSA block, so why the exception? And how to fix it?

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  • Problem with reCaptcha and .NET

    - by vtortola
    Hi, I get this error with reCaptcha: 'Input error: response: Required field must not be blank challenge: Required field must not be blank privatekey: Required field must not be blank' I'm sending the data via POST, so I don't understand what is going on. This is the code I use: public static Boolean Check(String challenge, String response) { try { String privatekey = "7LeAbLoSAAAABJBn05uo6sZoFNoFnK2XKyF3dRXL"; String remoteip = HttpContext.Current.Request.UserHostAddress; WebRequest req = WebRequest.Create("http://api-verify.recaptcha.net/verify"); req.Method = "POST"; using (StreamWriter sw = new StreamWriter(req.GetRequestStream())) { sw.Write("privatekey={0}&remoteip={1}&challenge={2}&response={3}", privatekey, remoteip, challenge, response); sw.Flush(); } String resultString = String.Empty; String errorString = String.Empty; using (StreamReader sr = new StreamReader(req.GetResponse().GetResponseStream())) { resultString = sr.ReadLine(); errorString = sr.ReadLine(); } Boolean b; return Boolean.TryParse(resultString, out b) && b; } catch (Exception) { return false; } } (Of course that'is not the correct private key :P) I have no idea what the problem is about, I think I'm sending the data correctly, but that error says that apparently I'm not sending anything. What could be the problem? Cheers.

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  • Ruby on Rails Decryption

    - by user812120
    0 down vote favorite share [g+] share [fb] share [tw] The following function works perfect in PHP. How can it be translated in Ruby on Rails. Please note that both privateKey and iv are 32 characters long. mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $privateKey, base64_decode($enc), MCRYPT_MODE_CBC, $iv) I tried to use the following in Ruby but got a bad decrypt error. cipher = OpenSSL::Cipher.new('aes-256-cbc') cipher.decrypt cipher.key = privateKey cipher.iv = iv decrypted = '' << cipher.update(encrypted) << cipher.final

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  • Recaptcha php problem [closed]

    - by Sam Gabriel
    Hey guys, I'm using recaptcha and I've got a problem, when a user clicks the signup button it redirects him to the sign up verification page, and here is the code, found on the very top of the web code, that checks the recaptcha entered data. <?php require_once('recaptchalib.php'); $privatekey = "***"; $resp = recaptcha_check_answer ($privatekey, $_SERVER["REMOTE_ADDR"], $_POST["recaptcha_challenge_field"], $_POST["recaptcha_response_field"]); if (!$resp->is_valid) { header('location: signup.php'); } ?> But it seems whatever I type in in the recaptcha box, be it right or wrong, I get redirected to the signup.php page. Here is the recaptcha code in the signup.php page: <?php ini_set('display_errors', 'On'); error_reporting(E_ALL | E_STRICT); require_once('recaptchalib.php'); $publickey = "***"; echo recaptcha_get_html($publickey); ?>

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  • [Java] RSA BadPaddingException : data must start with zero

    - by Robin Monjo
    Hello everyone. I try to implement an RSA algorithm in a Java program. I am facing the "BadPaddingException : data must start with zero". Here are the methods used to encrypt and decrypt my data : public byte[] encrypt(byte[] input) throws Exception { Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");// cipher.init(Cipher.ENCRYPT_MODE, this.publicKey); return cipher.doFinal(input); } public byte[] decrypt(byte[] input) throws Exception { Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");/// cipher.init(Cipher.DECRYPT_MODE, this.privateKey); return cipher.doFinal(input); } privateKey and publicKey attributes are read from files this way : public PrivateKey readPrivKeyFromFile(String keyFileName) throws IOException { PrivateKey key = null; try { FileInputStream fin = new FileInputStream(keyFileName); ObjectInputStream ois = new ObjectInputStream(fin); BigInteger m = (BigInteger) ois.readObject(); BigInteger e = (BigInteger) ois.readObject(); RSAPrivateKeySpec keySpec = new RSAPrivateKeySpec(m, e); KeyFactory fact = KeyFactory.getInstance("RSA"); key = fact.generatePrivate(keySpec); ois.close(); } catch (Exception e) { e.printStackTrace(); } return key; } Private key and Public key are created this way : public void Initialize() throws Exception { KeyPairGenerator keygen = KeyPairGenerator.getInstance("RSA"); keygen.initialize(2048); keyPair = keygen.generateKeyPair(); KeyFactory fact = KeyFactory.getInstance("RSA"); RSAPublicKeySpec pub = fact.getKeySpec(keyPair.getPublic(), RSAPublicKeySpec.class); RSAPrivateKeySpec priv = fact.getKeySpec(keyPair.getPrivate(), RSAPrivateKeySpec.class); saveToFile("public.key", pub.getModulus(), pub.getPublicExponent()); saveToFile("private.key", priv.getModulus(), priv.getPrivateExponent()); } and then saved in files : public void saveToFile(String fileName, BigInteger mod, BigInteger exp) throws IOException { FileOutputStream f = new FileOutputStream(fileName); ObjectOutputStream oos = new ObjectOutputStream(f); oos.writeObject(mod); oos.writeObject(exp); oos.close(); } I can't figured out how the problem come from. Any help would be appreciate ! Thanks in advance.

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