problem about sha256-Collection of common programming errors

11 years ago
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4 minutes

  • Bill the Lizard
    java bouncycastle sha256 elliptic-curve
    I am trying to generate a signature using ECDSA with SHA256 in Bouncy Castle as follows,I add the provider in the begining I have built the ECPrivatekey Signature s_oSignature = Signature.getInstance(“SHA256withECDSA”, BouncyCastleProvider.PROVIDER_NAME);but step 3 throws “java.security.NoSuchAlgorithmException: no such algorithm: SHA256withECDSA for provider BC”.But same “SHA256withECDSA” thing when replaced with “SHA1withECDSA” prceeds without any exception.How is it possible? I am using

  • Shehab Fawzy
    c# windows-8 sha256
    So in the old days I used to use System.Security.Cryptography which is not available in windows 8. what i found in windows 8 was windows.security but i didn’t find any examples on how to use Sha256 with a key. This is the old code that I used with System.Security.Cryptographystring appID = “appid”;string key = “password”;var hmacsha256 = new HMACSHA256(Encoding.Default.GetBytes(key));hmacsha256.ComputeHash(Encoding.Default.GetBytes(appID));string k = “”;foreach (byte test in hmacsha256.Hash){k +

  • McDermott
    ios objective-c hash sha256
    I want to create hash from a string. If the string has characters with accent (like é, o), it crashes with NSASCIIStringEncoding. It doesn’t crash with NSUTF8StringEncoding, but on the server it doesn’t match.+(NSString *) getSHA256FromString: (NSString *)clear {const char *s=[clear cStringUsingEncoding: NSASCIIStringEncoding];// NSUTF8StringEncoding works, but isn’t the same on serverNSData *keyData=[NSData dataWithBytes:s length:strlen(s)];uint8_t digest[CC_SHA256_DIGEST_LENGTH]={0};CC_SHA256(

  • aliasm2k
    php sha256 bitcoin
    I am making a bitcoin faucet using the coinbase api, and was looking to validate the address. I looked online to see if there are any good scripts, and couldnt find any so I decided to test and see if it was already built in the API, and it was! The the thing is that instead of just saying that is not a valid address it php displays a LONG error… Fatal error: Uncaught exception ‘Coinbase_ApiException’ with message ‘Please enter a valid email or bitcoin address’ in C:\xampp\htdocs\nahtnam\lib\C

  • user2782324
    sha256
    I was trying to use the sha2.c file from polarssl at this link,https://polarssl.org/sha-256-source-codeI am actually quite a newbie to this, but I was able to get this on Eclipse and when I tried to build it, it gives the errorc:/mingw/x86_64-w64-mingw32/lib/../lib/libmingw32.a(lib64_libmingw32_a-crt0_c.o):crt0_c.c:(.text+0x3d): undefined reference to `WinMain’do I have to pass some kind of data in the arguments? how can I find out how to use it?

  • millinon
    c++ gcc openssl sha256
    I’m writing a program to get myself acquainted with OpenSSL, libncurses, and UDP networking. I decided to work with OpenSSL’s SHA256 to become familiar with industry encryption standards, but I’m having issues with getting it working. I’ve isolated the error to the linking of OpenSSL with the compiled program. I’m working on Ubuntu 12.10, 64 bit. I have the package libssl-dev installed.Take, for instance, the C++ main.cpp:#include <iostream> #include <sstream> #include <string>

  • Frosty Z
    php encryption undefined trim sha256
    I have this php code:$password = sha256($_POST[‘password’]);but when I run this code it says:Fatal error: Call to undefined function sha256() in …. on line …ix it as What is wrong with this code and what must I do to fix this as I know that sha256 exists.I have also tried:$password = sha256(trim($_POST[‘password’]));But that doesn’t work either.

  • ThomasReggi
    node.js cryptography hmac sha256
    I can make an HMAC using the following:var encrypt = crypto.createHmac(“SHA256”, secret).update(string).digest(‘base64’);I am trying to decrypt an encoded HMAC with the secret:var decrypt = crypto.createDecipher(“SHA256”, secret).update(string).final(“ascii”);The following was unsuccessful. How can I decrypt a HMAC with the key?I get the following error:node-crypto : Unknown cipher SHA256crypto.js:155return (new Decipher).init(cipher, password);^ Error: DecipherInit error

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