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  • Implementing RSA-SHA1 signature algorithm in Java (creating a private key for use with OAuth RSA-SHA

    - by The Elite Gentleman
    Hi everyone, As you know, OAuth can support RSA-SHA1 Signature. I have an OAuthSignature interface that has the following method public String sign(String data, String consumerSecret, String tokenSecret) throws GeneralSecurityException; I successfully implemented and tested HMAC-SHA1 Signature (which OAuth Supports) as well as the PLAINTEXT "signature". I have searched google and I have to create a private key if I need to use SHA1withRSA signature: Sample code: /** * Signs the data with the given key and the provided algorithm. */ private static byte[] sign(PrivateKey key, String data) throws GeneralSecurityException { Signature signature = Signature.getInstance("SHA1withRSA"); signature.initSign(key); signature.update(data.getBytes()); return signature.sign(); } Now, How can I take the OAuth key (which is key = consumerSecret&tokenSecret) and create a PrivateKey to use with SHA1withRSA signature? Thanks

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  • half-sine pulse shaping

    - by kos
    hi, i wanted to know what is the pulse shape of the modem.oqpskmod? and if it is not half-sine pulse shape, how is it possible to make it half-sine pulse shape as it is stated in ieee 802.15.4(zigbee) standard where it shows it as follows p(t)=sin(pi*t/2*Tc) if 0<=t<=2Tc p(t)=0 if otherwise ? thanks a lot!

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  • Java Access Token PKCS11 Not found Provider

    - by oracleruiz
    Hello I'm trying to access the keystore from my smartcard in Java. And I'm using the following code.. I'm using the Pkcs11 implementation of OpenSc http://www.opensc-project.org/opensc File windows.cnf = name=dnie library=C:\WINDOWS\system32\opensc-pkcs11.dll Java Code = String configName = "windows.cnf" String PIN = "####"; Provider p = new sun.security.pkcs11.SunPKCS11(configName); Security.addProvider(p); KeyStore keyStore = KeyStore.getInstance("PKCS11", "SunPKCS11-dnie"); =)(= char[] pin = PIN.toCharArray(); keyStore.load(null, pin); When the execution goes by the line with =)(= throws me the following exeption java.security.KeyStoreException: PKCS11 not found at java.security.KeyStore.getInstance(KeyStore.java:635) at ObtenerDatos.LeerDatos(ObtenerDatos.java:52) at ObtenerDatos.obtenerNombre(ObtenerDatos.java:19) at main.main(main.java:27) Caused by: java.security.NoSuchAlgorithmException: no such algorithm: PKCS11 for provider SunPKCS11-dnie at sun.security.jca.GetInstance.getService(GetInstance.java:70) at sun.security.jca.GetInstance.getInstance(GetInstance.java:190) at java.security.Security.getImpl(Security.java:662) at java.security.KeyStore.getInstance(KeyStore.java:632) I think the problem is "SunPKCS11-dnie", but I don't know to put there. I had tried with a lot of combinations... Anyone can help me...

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  • How to Verify Signature, Loading PUBLIC KEY From PEM file?

    - by bbirtle
    I'm posting this in the hope it saves somebody else the hours I lost on this really stupid problem involving converting formats of public keys. If anybody sees a simpler solution or a problem, please let me know! The eCommerce system I'm using sends me some data along with a signature. They also give me their public key in .pem format. The .pem file looks like this: -----BEGIN PUBLIC KEY----- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDe+hkicNP7ROHUssGNtHwiT2Ew HFrSk/qwrcq8v5metRtTTFPE/nmzSkRnTs3GMpi57rBdxBBJW5W9cpNyGUh0jNXc VrOSClpD5Ri2hER/GcNrxVRP7RlWOqB1C03q4QYmwjHZ+zlM4OUhCCAtSWflB4wC Ka1g88CjFwRw/PB9kwIDAQAB -----END PUBLIC KEY----- Here's the magic code to turn the above into an "RSACryptoServiceProvider" which is capable of verifying the signature. Uses the BouncyCastle library, since .NET apparently (and appallingly cannot do it without some major headaches involving certificate files): RSACryptoServiceProvider thingee; using (var reader = File.OpenText(@"c:\pemfile.pem")) { var x = new PemReader(reader); var y = (RsaKeyParameters)x.ReadObject(); thingee = (RSACryptoServiceProvider)RSACryptoServiceProvider.Create(); var pa = new RSAParameters(); pa.Modulus = y.Modulus.ToByteArray(); pa.Exponent = y.Exponent.ToByteArray(); thingee.ImportParameters(pa); } And then the code to actually verify the signature: var signature = ... //reads from the packet sent by the eCommerce system var data = ... //reads from the packet sent by the eCommerce system var sha = new SHA1CryptoServiceProvider(); byte[] hash = sha.ComputeHash(Encoding.ASCII.GetBytes(data)); byte[] bSignature = Convert.FromBase64String(signature); ///Verify signature, FINALLY: var hasValidSig = thingee.VerifyHash(hash, CryptoConfig.MapNameToOID("SHA1"), bSignature);

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  • Securing a license key with RSA key.

    - by Jesse Knott
    Hello, it's late, I'm tired, and probably being quite dense.... I have written an application that I need to secure so it will only run on machines that I generate a key for. What I am doing for now is getting the BIOS serial number and generating a hash from that, I then am encrypting it using a XML RSA private key. I then sign the XML to ensure that it is not tampered with. I am trying to package the public key to decrypt and verify the signature with, but every time I try to execute the code as a different user than the one that generated the signature I get a failure on the signature. Most of my code is modified from sample code I have found since I am not as familiar with RSA encryption as I would like to be. Below is the code I was using and the code I thought I needed to use to get this working right... Any feedback would be greatly appreciated as I am quite lost at this point the original code I was working with was this, this code works fine as long as the user launching the program is the same one that signed the document originally... CspParameters cspParams = new CspParameters(); cspParams.KeyContainerName = "XML_DSIG_RSA_KEY"; cspParams.Flags = CspProviderFlags.UseMachineKeyStore; // Create a new RSA signing key and save it in the container. RSACryptoServiceProvider rsaKey = new RSACryptoServiceProvider(cspParams) { PersistKeyInCsp = true, }; This code is what I believe I should be doing but it's failing to verify the signature no matter what I do, regardless if it's the same user or a different one... RSACryptoServiceProvider rsaKey = new RSACryptoServiceProvider(); //Load the private key from xml file XmlDocument xmlPrivateKey = new XmlDocument(); xmlPrivateKey.Load("KeyPriv.xml"); rsaKey.FromXmlString(xmlPrivateKey.InnerXml); I believe this to have something to do with the key container name (Being a real dumbass here please excuse me) I am quite certain that this is the line that is both causing it to work in the first case and preventing it from working in the second case.... cspParams.KeyContainerName = "XML_DSIG_RSA_KEY"; Is there a way for me to sign/encrypt the XML with a private key when the application license is generated and then drop the public key in the app directory and use that to verify/decrypt the code? I can drop the encryption part if I can get the signature part working right. I was using it as a backup to obfuscate the origin of the license code I am keying from. Does any of this make sense? Am I a total dunce? Thanks for any help anyone can give me in this..

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  • Implementing DRM in enterprise environment

    - by Chathuranga Chandrasekara
    Consider the following Business requirement. There are some templates of documents on a server (MS OFFICE format) The users should be able to edit the documents and save a copy in the server. The users SHOULD NOT be able to save a local copy. i.e That option should be not available. Do I have any feature\hack to do this with MS Office? Think about a solution like google docs without the Download options. It is ideal but needs a lot of effort to implement it.

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  • How to read public key from PFX file in java

    - by articlestack
    I am able to read private key from PFX file but not public key. I am using following code to read public key. InputStream inStream = new FileInputStream(certFile); CertificateFactory cf = CertificateFactory.getInstance("X.509"); BufferedInputStream bis = new BufferedInputStream(inStream); // if (bis.available() > 0) { java.security.cert.Certificate cert = cf.generateCertificate(bis); System.out.println("This part is not getting printed in case of PFX file"); // } puk = (PublicKey) cert.getPublicKey(); This code is working properly when i read from .cer file. Please help

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  • Automate the signature of the update.rdf manifest for my firefox extension

    - by streetpc
    Hello, I'm developing a firefox extension and I'd like to provide automatic update to my beta-testers (who are not tech-savvy). Unfortunately, the update server doesn't provide HTTPS. According to the Extension Developer Guide on signing updates, I have to sign my update.rdf and provide an encoded public key in the install.rdf. There is the McCoy tool to do all of this, but it is an interactive GUI tool and I'd like to automate the extension packaging using an Ant script (as this is part of a much bigger process). I can't find a more precise description of what's happening to sign the update.rdf manifest than below, and McCoy source is an awful lot of javascript. The doc says: The add-on author creates a public/private RSA cryptographic key pair. The public part of the key is DER encoded and then base 64 encoded and added to the add-on's install.rdf as an updateKey entry. (...) Roughly speaking the update information is converted to a string, then hashed using a sha512 hashing algorithm and this hash is signed using the private key. The resultant data is DER encoded then base 64 encoded for inclusion in the update.rdf as an signature entry. I don't know well about DER encoding, but it seems like it needs some parameters. So would anyone know either the full algortihm to sign the update.rdf and install.rdf using a predefined keypair, or a scriptable alternative to McCoy whether a command-line tool like asn1coding will suffise a good/simple developer tutorial on DER encoding

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  • Digitally Sign Parts of a XML document

    - by Eros
    I have an XML document having structure similar to the following <envelop> <header>blaa</header> <message>blaa blaa</message> <footer></footer> </envelop> I want to digitally sign the header and message elements and add the signature to the footer element. How can I sign the elements and then later verify the signature (using .net c#) ?

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  • Verify Authenticode signature as being from our company for automatic updater

    - by James Johnston
    I am implementing an automatic update feature and need some advice on how to do this securely using best practices. I would like to use the downloaded file's Authenticode signature to verify that it is safe to run (i.e. originates from our company and hasn't been tampered with). My question is very similar to question #2008519. The bottom-line question: what's the best, most secure way to check Authenticode signatures for an automatic update feature? What fields in the certificate should be checked? Requirements being: (1) check signature is valid, (2) check it's my signature, (3) old clients can still update when my certificate expires and I get a new one. Here's some background information / ideas from my research: I believe this could be broken into two steps: Verify that the signature is valid. I believe this should be easy using WinVerifyTrust as outlined in http://msdn.microsoft.com/en-us/library/aa382384(VS.85).aspx - I don't expect problems here. Verify that the signature corresponds to our company, and not another company. This seems to be a more difficult question to answer: One possibility is to check some of the strings in the signature. Could be obtained via code at MS KB article #323809, but this article doesn't make recommendations on what fields should be checked for this type of application (or any other, for that matter). Question #1072540 also illustrates how to get some certificate info, but again doesn't recommend what fields to actually check. My concern is that the strings might not be the best check: what if another person is able to obtain a certificate with the same name, for example? Or if there's a valid reason for us to change the strings in the future? The person at question #2008519 has a very similar requirement. His need for a "TrustedByUs" function is identical to mine. However, he goes about doing the check by comparing public keys. While this would work in the short-term, it seems like it won't work for an automatic update feature. This is because code signing certificates are only valid for 2 - 3 years max. Therefore, in the future, when we buy a new certificate in 2 years, the old clients wouldn't be able to update any more due to the change in public key.

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  • Generating a scalogram of a signal

    - by Goz
    Hi there, I'm trying to build a scalogram view for my app to see whether there is relevant information we can retrieve from a wavelet transform as opposed to using a spectograms to see what can be retrieved via an FFT. So far I can take a wave form and I can perform the forward wavelet transform on it. However I am lost at the next step. How do I turn this information into power/energy information? I have a set of wave forms at different frequencies but I have, as I say, no frequency information. Can anyone tell me what the next step is for turning this transformed data into a scalogram? Any help would be much appreciated because my google skills are failing me!

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  • java keytool question

    - by user384706
    Hi, I created a java keystore programmatically of type jks (i.e. default type). It is initially empty so I created a DSA certificate. keytool -genkey -alias myCert -v -keystore trivial.keystore How can I see the public and private keys? I.e. is there a command that prints the private key of my certificate? I could only find keytool -certreq which in my understanding prints the certificate as a whole: -----BEGIN NEW CERTIFICATE REQUEST----- MIICaTCCAicCAQAwZTELMAkGA1UEBhMCR1IxDzANBgNVBAgTBkdyZWVjZTEPMA0GA1UEBxMGQXRo BQADLwAwLAIUQZbY/3Qq0G26fsBbWiHMbuVd3VICFE+gwtUauYiRbHh0caAtRj3qRTwl -----END NEW CERTIFICATE REQUEST----- I assume this is the whole certificate. How can I see private (or public key) via keytool? Thank you

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  • How to make prevent public key inside jar to be saved using Java code

    - by Abhijith V R
    After signing a jar , we can retrieve the public keys from jar using Certificate[] cert = jarentry.getCertificates(); Once certificate is extracted we can save this to a new keystore as trusted cert. Once this is done , then second user can sign any jar using this certificate , isn't ? I want to distribute content as jars , contents will contain properties files for a application init. I want to make sure that an user is not capable to rebuilding the property files using the certificate he extracted from jarentry. In the code which reads the jar contents i am checking that jar is signed with my certificate only and also checking that jar is not tampered with . But the issue came to my mind that if i am able to extract the cerificate from jar then why don;t a third guy ? Can any one help me in this............

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  • Google OAuthGetRequestToken returns "signature_invalid"

    - by M Schenkel
    Trying for hours to get a request token using Google OAuthGetRequestToken but it always returns "signature_invalid". For a test I use the oAuth Playground to successfully request the token. Here are the results: Signature base string GET&https%3A%2F%2Fwww.google.com%2Faccounts%2FOAuthGetRequestToken&oauth_callback%3Dhttp%253A%252F%252Fgooglecodesamples.com%252Foauth_playground%252Findex.php%26oauth_consumer_key%3Dwww.embeddedanalytics.com%26oauth_nonce%3D56aa884162ed21815a0406725c79cf79%26oauth_signature_method%3DRSA-SHA1%26oauth_timestamp%3D1321417095%26oauth_version%3D1.0%26scope%3Dhttps%253A%252F%252Fwww.google.com%252Fanalytics%252Ffeeds%252F Request/Response GET /accounts/OAuthGetRequestToken?scope=https%3A%2F%2Fwww.google.com%2Fanalytics%2Ffeeds%2F HTTP/1.1 Host: www.google.com Accept: */* Authorization: OAuth oauth_version="1.0", oauth_nonce="56aa884162ed21815a0406725c79cf79", oauth_timestamp="1321417095", oauth_consumer_key="www.embeddedanalytics.com", oauth_callback="http%3A%2F%2Fgooglecodesamples.com%2Foauth_playground%2Findex.php", oauth_signature_method="RSA-SHA1", oauth_signature="qRtorIaSFaQdOXW1u6eMQlY9LT2j7ThG5kgkcD6rDcW4MIvzluslFgYRNTuRvnaruraNpItjojtgsrK9deYRKoHBGOlU27SsWy6jECxKczcSECl3cVAcjk7dvbywFMDkgi1ZhTZ5Q%2BFoD60HoVQUYnGUbOO0jPXI48LfkiA5ZN4%3D" HTTP/1.1 200 OK Content-Type: text/plain; charset=UTF-8 Date: Wed, 16 Nov 2011 04:18:15 GMT Expires: Wed, 16 Nov 2011 04:18:15 GMT Cache-Control: private, max-age=0 X-Content-Type-Options: nosniff X-XSS-Protection: 1; mode=block Content-Length: 118 Server: GSE oauth_token=4%2FmO86qZzixayI2NoUc-hewC--D53R&oauth_token_secret=r0PReF9D83w1d6uP0nyQQm9c&oauth_callback_confirmed=true I am using Fiddler to trace my calls. It returns the Signature base string: GET&https%3A%2F%2Fwww.google.com%2Faccounts%2FOAuthGetRequestToken&oauth_callback%3Dhttp%253A%252F%252Fgooglecodesamples.com%252Foauth_playground%252Findex.php%26oauth_consumer_key%3Dwww.embeddedanalytics.com%26oauth_nonce%3Dl9Jydzjyzt2fJfM3ltY5yrxxYy2uh1U7%26oauth_signature_method%3DRSA-SHA1%26oauth_timestamp%3D1321417107%26oauth_version%3D1.0%26scope%3Dhttps%253A%252F%252Fwww.google.com%252Fanalytics%252Ffeeds%252F Aside from the oauth_timestamp and oauth_nonce (which should be different), the base string are pretty much identical. Anyone know what I am doing wrong? Update 11/20/2011 Thinking it might be something wrong with my RSA-SHA signing, I have since tried HMAC-SHA. It gives the same results. I thought it might be beneficial to include the Fiddler results (I added carriage returns to have it format better). GET https://www.google.com/accounts/OAuthGetRequestToken? scope=https%3A%2F%2Fwww.google.com%2Fanalytics%2Ffeeds%2F HTTP/1.1 Content-Type: application/x-www-form-urlencoded Authorization: OAuth oauth_version="1.0", oauth_nonce="7C4C900EAACC9C7B62E399A91B81D8DC", oauth_timestamp="1321845418", oauth_consumer_key="www.embeddedanalytics.com", oauth_signature_method="HMAC-SHA1", oauth_signature="ows%2BbFTNSR8jVZo53rGBB8%2BfwFM%3D" Host: www.google.com Accept: */* Accept-Encoding: identity Response HTTP/1.1 400 Bad Request Content-Type: text/plain; charset=UTF-8 Date: Mon, 21 Nov 2011 03:16:57 GMT Expires: Mon, 21 Nov 2011 03:16:57 GMT Cache-Control: private, max-age=0 X-Content-Type-Options: nosniff X-XSS-Protection: 1; mode=block Content-Length: 358 Server: GSE signature_invalid base_string:GET&https%3A%2F%2Fwww.google.com%2Faccounts%2FOAuthGetRequestToken &oauth_consumer_key%3Dwww.embeddedanalytics.com %26oauth_nonce%3D7C4C900EAACC9C7B62E399A91B81D8DC %26oauth_signature_method%3DHMAC-SHA1 %26oauth_timestamp%3D1321845418 %26oauth_version%3D1.0 %26scope%3Dhttps%253A%252F%252Fwww.google.com%252Fanalytics%252Ffeeds%252F

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  • Does Python/Scipy have a firls( ) replacement (i.e. a weighted, least squares, FIR filter design)?

    - by delicasso
    I am porting code from Matlab to Python and am having trouble finding a replacement for the firls( ) routine. It is used for, least-squares linear-phase Finite Impulse Response (FIR) filter design. I looked at scipy.signal and nothing there looked like it would do the trick. Of course I was able to replace my remez and freqz algorithsm, so that's good. On one blog I found an algorithm that implemented this filter without weighting, but I need one with weights. Thanks, David

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  • How do I delete a signature from an Excel document using Office automation

    - by Guy Marom
    Hello, I have a signed Excel workbook and I want to delete the signature from it. The problem is that when I try to delete the signature there's a prompt for confirming the deletion and I want the process to be fully automatic. Here's a code sample, the prompt appears when the last line executes: Dim source As String = "c:\temp\signed.xlsx" Dim app As New Application() app.Visible = True Dim book As Workbook = app.Workbooks.Open(source, UpdateLinks:=0) app.ShowToolTips = False Dim sig As Microsoft.Office.Core.Signature = book.Signatures.Item(1) sig.Delete() Thanks

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  • Compass accuracy dilemma

    - by mob1lejunkie
    I need to build compass for my application. From reading the documentation it seems there are two reasonable ways of doing this: Sensor.TYPE_ORIENTATION method: This is the easy way of doing it. The problem with this is it is not accurate. When I compare my reading with Snaptic Compass it is about 10-15 degress off which for my purposes is unacceptable. Sensor.TYPE_ACCELEROMETER, Sensor.TYPE_MAGNETIC_FIELD and getRotationMatrix() in conjunction with remapCoordinateSystem() and getOrientation() method: The documentation says this "is usually more accurate". The problem is regardless of the delay I register with listener the compass goes crazy even when the device is stationary on flat surface. Any suggestions for solving this problem will be greatly appreciated.

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  • How to create real-life robots?

    - by Click Upvote
    Even before I learnt programming I've been fascinated with how robots could work. Now I know how the underlying programming instructions would be written, but what I don't understand is how those intructions are followed by the robot. For example, if I wrote this code: object=Robot.ScanSurroundings(300,400); if (Objects.isEatable(object)) { Robot.moveLeftArm(300,400); Robot.pickObject(object); } How would this program be followed by the CPU in a way that would make the robot do the physical action of looking to the left, moving his arm, and such? Is it done primarily in binary language/ASM? Lastly, where would i go if I wanted to learn how to create a robot?

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  • Java loading user-specified classes at runtime

    - by user349043
    I'm working on robot simulation in Java (a Swing application). I have an abstract class "Robot" from which different types of Robots are derived, e.g. public class StupidRobot extends Robot { int m_stupidness; int m_insanityLevel; ... } public class AngryRobot extends Robot { float m_aggression; ... } As you can see, each Robot subclass has a different set of parameters. What I would like to do is control the simulation setup in the initial UI. Choose the number and type of Robots, give it a name, fill in the parameters etc. This is one of those times where being such a dinosaur programmer, and new to Java, I wonder if there is some higher level stuff/thinking that could help me here. So here is what I've got: (1) User Interface Scrolling list of Robot types on the left. "Add " and "<< Remove" buttons in the middle. Default-named scrolling list of Robots on the right. "Set Parameters" button underneath. (So if you wanted an AngryRobot, you'd select AngryRobot on the left list, click "Add" and "AngryRobot1" would show up on the right.) When selecting a Robot on the right, click "Set Parameters..." button which would call yet another model dialog where you'd fill in the parameters. Different dialog called for each Robot type. (2) Data structures an implementation As an end-product I think a HashMap would be most convenient. The keys would be Robot types and the accompanying object would be all of the parameters. The initializer could just retrieve each item one and a time and instantiate. Here's what the data structures would look like: enum ROBOT_TYPE {STUPID, ANGRY, etc} public class RobotInitializer { public ROBOT_TYPE m_type; public string m_name; public int[] m_int_params; public float[] m_float_params; etc. The initializer's constructor would create the appropriate length parameter arrays based on the type: public RobotInitializer(ROBOT_TYPE type, int[] int_array, float[] float_array, etc){ switch (type){ case STUPID: m_int_params = new int[STUPID_INT_PARAM_LENGTH]; System.arraycopy(int_array,0,m_int_params,0,STUPID_INT_PARAM_LENGTH); etc. Once all the RobotInitializers are instantiated, they are added to the HashMap. Iterating through the HashMap, the simulation initializer takes items from the Hashmap and instantiates the appropriate Robots. Is this reasonable? If not, how can it be improved? Thanks

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  • How can I know if a file has been changed in .NET C#?

    - by Anthony D
    I have an application that requires a secure way to store its configuration. There are users that can change the configuration. I need some sort of signature scheme where I can verify that the config file has not changed with out a valid user. I had thought about using RSA, where the private key is encrypted with the users password, and the public key is used to sign the config. However there is nothing to prevent someone from changing the user file and adding their own public key, thus circumventing my security. Any ideas?

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  • Programmatically Determine If An Excel File (.xls) Contains Macros

    - by Gkakk McJkakk
    Is there any way to programmatically determine if an .xls contains macros, without actually opening it in Excel? Also are there any methods to examine which certificate (including timestamp cert) these macros are signed with? Again without using Excel. I'm wondering in particular if there are any strings that always show up in the raw data of an Excel file when macros are present.

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  • How to sign XML document or verify XML document signature with C++?

    - by Budda
    Subj. I need to sign/verify in native C++ (no .NET), using private key for signing, public key for verification. I saw few examples on MSDN (http://msdn.microsoft.com/en-us/library/ms761363(VS.85).aspx) that demonstrate how to sign the document with CSP (I don't know what this means). For my case I need to create a "key" from the binary data array... can somebody help me with that? Thank you in advance.

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