{"id":2992,"date":"2014-03-13T01:30:56","date_gmt":"2014-03-13T01:30:56","guid":{"rendered":"https:\/\/unknownerror.org\/index.php\/2014\/03\/13\/problem-about-sha256-collection-of-common-programming-errors\/"},"modified":"2014-03-13T01:30:56","modified_gmt":"2014-03-13T01:30:56","slug":"problem-about-sha256-collection-of-common-programming-errors","status":"publish","type":"post","link":"https:\/\/unknownerror.org\/index.php\/2014\/03\/13\/problem-about-sha256-collection-of-common-programming-errors\/","title":{"rendered":"problem about sha256-Collection of common programming errors"},"content":{"rendered":"<ul>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/fc763c6ff6c160ddad05741e87e517b6?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nBill the Lizard<br \/>\njava bouncycastle sha256 elliptic-curve<br \/>\nI 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(&#8220;SHA256withECDSA&#8221;, BouncyCastleProvider.PROVIDER_NAME);but step 3 throws &#8220;java.security.NoSuchAlgorithmException: no such algorithm: SHA256withECDSA for provider BC&#8221;.But same &#8220;SHA256withECDSA&#8221; thing when replaced with &#8220;SHA1withECDSA&#8221; prceeds without any exception.How is it possible? I am using<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/i.stack.imgur.com\/EvJ6I.jpg?s=32&amp;g=1\" \/><br \/>\nShehab Fawzy<br \/>\nc# windows-8 sha256<br \/>\nSo 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&#8217;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 = &#8220;appid&#8221;;string key = &#8220;password&#8221;;var hmacsha256 = new HMACSHA256(Encoding.Default.GetBytes(key));hmacsha256.ComputeHash(Encoding.Default.GetBytes(appID));string k = &#8220;&#8221;;foreach (byte test in hmacsha256.Hash){k +<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/e6d21660f6efe05ce22e89cfb9318356?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nMcDermott<br \/>\nios objective-c hash sha256<br \/>\nI want to create hash from a string. If the string has characters with accent (like \u00e9, o), it crashes with NSASCIIStringEncoding. It doesn&#8217;t crash with NSUTF8StringEncoding, but on the server it doesn&#8217;t match.+(NSString *) getSHA256FromString: (NSString *)clear {const char *s=[clear cStringUsingEncoding: NSASCIIStringEncoding];\/\/ NSUTF8StringEncoding works, but isn&#8217;t the same on serverNSData *keyData=[NSData dataWithBytes:s length:strlen(s)];uint8_t digest[CC_SHA256_DIGEST_LENGTH]={0};CC_SHA256(<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/490e6a4234c359f7d60ccee45d2aee86?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\naliasm2k<br \/>\nphp sha256 bitcoin<br \/>\nI 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&#8230; Fatal error: Uncaught exception &#8216;Coinbase_ApiException&#8217; with message &#8216;Please enter a valid email or bitcoin address&#8217; in C:\\xampp\\htdocs\\nahtnam\\lib\\C<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/43a95aa8198e8e2090bc2bfb936ac867?s=32&amp;d=identicon&amp;r=PG&amp;f=1\" \/><br \/>\nuser2782324<br \/>\nsha256<br \/>\nI 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&#8217;do I have to pass some kind of data in the arguments? how can I find out how to use it?<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/3e72cbdf423835d8ddd43f8aff743600?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nmillinon<br \/>\nc++ gcc openssl sha256<br \/>\nI&#8217;m writing a program to get myself acquainted with OpenSSL, libncurses, and UDP networking. I decided to work with OpenSSL&#8217;s SHA256 to become familiar with industry encryption standards, but I&#8217;m having issues with getting it working. I&#8217;ve isolated the error to the linking of OpenSSL with the compiled program. I&#8217;m working on Ubuntu 12.10, 64 bit. I have the package libssl-dev installed.Take, for instance, the C++ main.cpp:#include &lt;iostream&gt; #include &lt;sstream&gt; #include &lt;string&gt;<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/ecdd712b4cb09a101bb2dc23c74329a8?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nFrosty Z<br \/>\nphp encryption undefined trim sha256<br \/>\nI have this php code:$password = sha256($_POST[&#8216;password&#8217;]);but when I run this code it says:Fatal error: Call to undefined function sha256() in &#8230;. on line &#8230;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[&#8216;password&#8217;]));But that doesn&#8217;t work either.<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/46a6db74ccc3bf4e009f875283401c14?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nThomasReggi<br \/>\nnode.js cryptography hmac sha256<br \/>\nI can make an HMAC using the following:var encrypt = crypto.createHmac(&#8220;SHA256&#8221;, secret).update(string).digest(&#8216;base64&#8217;);I am trying to decrypt an encoded HMAC with the secret:var decrypt = crypto.createDecipher(&#8220;SHA256&#8221;, secret).update(string).final(&#8220;ascii&#8221;);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<\/li>\n<\/ul>\n<p>Web site is in building<\/p>\n","protected":false},"excerpt":{"rendered":"<p>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(&#8220;SHA256withECDSA&#8221;, BouncyCastleProvider.PROVIDER_NAME);but step 3 throws &#8220;java.security.NoSuchAlgorithmException: no such algorithm: SHA256withECDSA for provider BC&#8221;.But same &#8220;SHA256withECDSA&#8221; thing when replaced [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2992","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/2992","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/comments?post=2992"}],"version-history":[{"count":0,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/2992\/revisions"}],"wp:attachment":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/media?parent=2992"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/categories?post=2992"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/tags?post=2992"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}