sha256

I need to calculate a SHA-256 hash of a large file (or portion of it). My implementation works fine, but its much slower than the C++'s CryptoPP calculation (25 Min. vs. 10 Min for ~30GB file). What I need is a similar execution time in C++ and Java, so the hashes are ready at almost the same time. I also tried the Bouncy Castle implementation, but it gave me the same result. Here is how I calculate the hash: int buff = 16384; try { RandomAccessFile file = new RandomAccessFile("T:\\someLargeFile.m2v", "r"); long startTime = System.nanoTime(); MessageDigest hashSum = MessageDigest.getInstance(

Windows下使用自带certutil工具校验文件MD5、SHA1、SHA256。 Windows下shell（或cmd）中也集成了专门的工具用来校验文件的MD5值、SHA1值、SHA256值的，吼吼吼！命令是： certutil -hashfile xxx MD5 certutil -hashfile xxx SHA1 certutil -hashfile xxx SHA256 xxx表示将验证文件的绝对路径（地址要填对）； 来源： https://my.oschina.net/u/4075942/blog/3107091

Why aren't these the same? php: $hash = hash('sha256', $userData['salt'] . hash('sha256', $password) ); c# public static string ComputeHash(string plainText, string salt) { // Convert plain text into a byte array. byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText); byte[] saltBytes = Encoding.UTF8.GetBytes(salt); SHA256Managed hash = new SHA256Managed(); // Compute hash value of salt. byte[] plainHash = hash.ComputeHash(plainTextBytes); byte[] concat = new byte[plainHash.Length + saltBytes.Length]; System.Buffer.BlockCopy(saltBytes, 0, concat, 0, saltBytes.Length); System.Buffer

It's the year 2017 and anybody who needs to use hashes should avoid 'broken' ones such as MD5, if security is important. Has anybody found or created a way to do more secure SHA256 or SHA512 hashing in Excel, without using VBA or macros? A spectacular example of this being done before was over 3½ years ago with MD5 (as seen in this SO: MD5 Hash function in excel without using VBA ). Reason for avoiding VBA/Macros: Compatibility with mobile devices, such as Excel for iOS. Side Note: The original Stack Overflow post has a successful answer with a dead link, here is a new link for reference:

I'm trying to write a C function using OpenSSL/libcrypto to calculate the SHA256 sum of a file. I'm basing my code on Adam Lamer's c++ example here . Here's my code: int main (int argc, char** argv) { char calc_hash[65]; calc_sha256("file.txt", calc_hash); } int calc_sha256 (char* path, char output[65]) { FILE* file = fopen(path, "rb"); if(!file) return -1; char hash[SHA256_DIGEST_LENGTH]; SHA256_CTX sha256; SHA256_Init(&sha256); const int bufSize = 32768; char* buffer = malloc(bufSize); int bytesRead = 0; if(!buffer) return -1; while((bytesRead = fread(buffer, 1, bufSize, file))) { SHA256

MD5 and SHA-1 hashes have weaknesses against collision attacks. SHA256 does not but it outputs 256 bits. Can I safely take the first or last 128 bits and use that as the hash? I know it will be weaker (because it has less bits) but otherwise will it work? Basically I want to use this to uniquely identify files in a file system that might one day contain a trillion files. I'm aware of the birthday problem and a 128 bit hash should yield about a 1 in a trillion chance on a trillion files that there would be two different files with the same hash. I can live with those odds. What I can't live

http://code.jquery.com/ 到此地址查看； jQuery 3.x jQuery Core 3.4.1 <script src="http://code.jquery.com/jquery-3.4.1.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script> jQuery 2.x jQuery Core 2.2.4 <script src="http://code.jquery.com/jquery-2.2.4.min.js" integrity="sha256-BbhdlvQf/xTY9gja0Dq3HiwQF8LaCRTXxZKRutelT44=" crossorigin="anonymous"></script> jQuery 1.x jQuery Core 1.12.4 <script src="http://code.jquery.com/jquery-1.12.4.min.js" integrity="sha256-ZosEbRLbNQzLpnKIkEdrPv7lOy9C27hHQ+Xp8a4MxAQ=" crossorigin="anonymous"></script> 来源： https:/

We have a piece of code which creates a SigningCredentials object to use to sign xml document by using SHA256 algorithm. It works with .NET 3.5 perfectly. However, when we upgrade our codebase to .NET 4.5, it stops working. Same code, same certificate! I have spent hours on debugging and searching on the internet without any luck. Could anyone please tell me what the problem here is? Thank you in advance. Code to create SigningCredentials: public SigningCredentials CreateSigningCredentials(X509Certificate2 cert) { var ski = new SecurityKeyIdentifier(new X509RawDataKeyIdentifierClause(cert));

C#自带的类库实现sha265会返回一个byte[] 数组 这个数组的长度是32，js的sha265是64，是把每个byte直接转换成了2个hex字符串。 C#中加密后是44位是因为把这个数组用base64编码成了字符串。 C#中也直接把byte转换成对应的hex字符串就和js中一样了。 另外，把str转换成byte[]数组的Encoding 如果不同，sha是不同的，一般js的都是utf8. public static string SHA256( string str) { //如果str有中文，不同Encoding的sha是不同的！！ byte [] SHA256Data = Encoding.UTF8.GetBytes(str); SHA256Managed Sha256 = new SHA256Managed(); byte [] by = Sha256.ComputeHash(SHA256Data); return BitConverter.ToString( by ).Replace( "-" , "" ).ToLower(); //64 //return Convert.ToBase64String(by); //44 } static void Main( string [] args) { string s = "hello world" ; //sha265