sha256

Without using 3rd party BouncyCastle library, is there a way to read a custom private key and sign the message ? (sha256 hash+encryption using private key) Technically, yes. Depending on what kind of key you have the answer gets more tricky. PKCS#8 PrivateKeyInfo (PEM "BEGIN PRIVATE KEY") If you have this type of file, and you're on .NET 4.6 or higher, then yes. You need to have the DER encoded (vs PEM encoded) data blob (see below if it's PEM). using (CngKey key = CngKey.Import(blob, CngKeyBlobFormat.Pkcs8PrivateBlob)) using (RSA rsa = new RSACng(key)) { return rsa.SignData(data,

PHP code: echo hash('sha256', 'jake'); PHP output: cdf30c6b345276278bedc7bcedd9d5582f5b8e0c1dd858f46ef4ea231f92731d Java code: String s = "jake"; MessageDigest md = MessageDigest.getInstance("SHA-256"); md.update(s.getBytes(Charset.forName("UTF-8"))); byte[] hashed = md.digest(); String s2 = ""; for (byte b : hashed) { s2 += b; } System.out.println(s2); Java output: -51-1312107528211839-117-19-57-68-19-39-43884791-1141229-4088-12110-12-223531-11011529 I had expected the two to return the same result. Obviously, this is not the case. How can I get the two to match up or is it impossible? EDIT:

Amazon Product API now requires a signature with every request which I'm trying to generate ushing Python. The step I get hung up on is this one: "Calculate an RFC 2104-compliant HMAC with the SHA256 hash algorithm using the string above with our "dummy" Secret Access Key: 1234567890. For more information about this step, see documentation and code samples for your programming language." Given a string and a secret key (in this case 1234567890) how do I calculate this hash using Python? ----------- UPDATE ------------- The first solution using HMAC.new looks correct however I'm getting a

I try to hash a string using SHA256, I'm using the following code: using System; using System.Security.Cryptography; using System.Text; public class Hash { public static string getHashSha256(string text) { byte[] bytes = Encoding.Unicode.GetBytes(text); SHA256Managed hashstring = new SHA256Managed(); byte[] hash = hashstring.ComputeHash(bytes); string hashString = string.Empty; foreach (byte x in hash) { hashString += String.Format("{0:x2}", x); } return hashString; } } However, this code gives significantly different results compared to my friends php, as well as online generators (such as

This question already has an answer here: How to decrypt file in Java encrypted with openssl command using AES? 3 answers AES 256 Encryption Issue 1 answer I'm using Java 8 and I'm attempting to emulate the following openssl calls with Java. Encrypt: echo -n 'hello world' | openssl enc -a -aes-256-cbc -md sha256 -pass pass:97DE:4F76 U2FsdGVkX18PnO/NLSxJ1pg6OKoLyZApMz7aBRfKhJc= Decrypt: echo U2FsdGVkX18PnO/NLSxJ1pg6OKoLyZApMz7aBRfKhJc= | openssl enc -d -a -aes-256-cbc -md sha256 -pass pass:97DE:4F76 hello world Questions: My implementation doesn't work. I've visited many other StackOverflow

/** * 利用java原生的类实现SHA256加密 * * @param str * @return */ private String getSHA256(String str) { MessageDigest messageDigest; String encodestr = ""; try { messageDigest = MessageDigest.getInstance("SHA-256"); messageDigest.update(str.getBytes("UTF-8")); encodestr = byte2Hex(messageDigest.digest()); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return encodestr; } //15 转16进制 /** * 将byte转为16进制 * * @param bytes * @return */ private static String byte2Hex(byte[] bytes) { StringBuffer stringBuffer = new StringBuffer();