There are two steps: 1. Create md5 data from a string 2. Covert the md5 data to a hex string Swift 2.0: func md5(string string: String) -> String { var digest = [UInt8](count: Int(CC_MD5_DIGEST_LENGTH), repeatedValue: 0) if let data = string.dataUsingEncoding(NSUTF8StringEncoding) { CC_MD5(data.bytes, CC_LONG(data.length), &digest) } var digestHex = “” for index in 0..<Int(CC_MD5_DIGEST_LENGTH) { … Read more
Check out Hex.encodeHexString from Apache Commons Codec. import org.apache.commons.codec.binary.Hex; String hex = Hex.encodeHexString(bytes);
You need to read the file in chunks of suitable size: def md5_for_file(f, block_size=2**20): md5 = hashlib.md5() while True: data = f.read(block_size) if not data: break md5.update(data) return md5.digest() Note: Make sure you open your file with the ‘rb’ to the open – otherwise you will get the wrong result. So to do the whole … Read more
In regards to your error and what’s missing in your code. m is a name which is not defined for getmd5() function. No offence, I know you are a beginner, but your code is all over the place. Let’s look at your issues one by one 🙂 First, you are not using hashlib.md5.hexdigest() method correctly. … Read more
Yes. MD5 has been completely broken from a security perspective, but the probability of an accidental collision is still vanishingly small. Just be sure that the files aren’t being created by someone you don’t trust and who might have malicious intent.
Probability of just two hashes accidentally colliding is 1/2128 which is 1 in 340 undecillion 282 decillion 366 nonillion 920 octillion 938 septillion 463 sextillion 463 quintillion 374 quadrillion 607 trillion 431 billion 768 million 211 thousand 456. However if you keep all the hashes then the probability is a bit higher thanks to birthday … Read more
TL;DR use buffers to not use tons of memory. We get to the crux of your problem, I believe, when we consider the memory implications of working with very large files. We don’t want this bad boy to churn through 2 gigs of ram for a 2 gigabyte file so, as pasztorpisti points out, we … Read more
I didn’t verify this myself, but you can look at this JavaScript implementation of Java’s String.hashCode() method. Seems reasonably short. With this prototype you can simply call .hashCode() on any string, e.g. “some string”.hashCode(), and receive a numerical hash code (more specifically, a Java equivalent) such as 1395333309. String.prototype.hashCode = function() { var hash = … Read more
MD5 processes an arbitrary-length message into a fixed-length output of 128 bits, typically represented as a sequence of 32 hexadecimal digits.
As per MSDN Create MD5: public static string CreateMD5(string input) { // Use input string to calculate MD5 hash using (System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create()) { byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(input); byte[] hashBytes = md5.ComputeHash(inputBytes); return Convert.ToHexString(hashBytes); // .NET 5 + // Convert the byte array to hexadecimal string prior to .NET 5 // StringBuilder sb = … Read more