bash determine if variable is empty and if so exit.
The answer I prefer is following [[ -z “$1” ]] && { echo “Parameter 1 is empty” ; exit 1; } Note, don’t forget the ; into the {} after each instruction
md5
Why is it not possible to reverse a cryptographic hash?
MD5 is designed to be cryptographically irreversible. In this case, the most important property is that it is computationally unfeasible to find the reverse of a hash, but it is easy to find the hash of any data. For example, let’s think about just operating on numbers (binary files after all, could be interpreted as … Read more
Get MD5 String from Message Digest
You can get it writing less: String hex = (new HexBinaryAdapter()).marshal(md5.digest(YOUR_STRING.getBytes()))
How do I create an MD5 Hash of a string in Cocoa?
This is the category I use: NSString+MD5.h @interface NSString (MD5) – (NSString *)MD5String; @end NSString+MD5.m #import <CommonCrypto/CommonDigest.h> @implementation NSString (MD5) – (NSString *)MD5String { const char *cStr = [self UTF8String]; unsigned char result[CC_MD5_DIGEST_LENGTH]; CC_MD5( cStr, (CC_LONG)strlen(cStr), result ); return [NSString stringWithFormat: @”%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X”, result[0], result[1], result[2], result[3], result[4], result[5], result[6], result[7], result[8], result[9], result[10], result[11], result[12], … Read more
MD5 hash from file in C++
Here’s a straight forward implementation of the md5sum command that computes and displays the MD5 of the file specified on the command-line. It needs to be linked against the OpenSSL library (gcc md5.c -o md5 -lssl) to work. It’s pure C, but you should be able to adapt it to your C++ application easily enough. … Read more
Why md5(‘240610708’) is equal to md5(‘QNKCDZO’)? [duplicate]
md5(‘240610708’) ‘s result is 0e462097431906509019562988736854. md5(‘QNKCDZO’) ‘s result is 0e830400451993494058024219903391. They are both float number format strings (numerical strings), and if you use == in php, when compare a number with a string or the comparison involves numerical strings, then each string is converted to a number and the comparison performed numerically. Both of the … Read more
How can it be impossible to “decrypt” an MD5 hash? [duplicate]
Basically it’s because the output of MD5 contains less information than the input. This is basically what distinguishes a hash algorithm from an encryption algorithm. Here’s a simple example: imagine an algorithm to compute the hash of a 10-digit number. The algorithm is “return the last 2 digits.” If I take the hash of 8023798734, … Read more
How to compute a md5 hash in a pre-request script in PostMan?
You can create the following pre-request script provided your parameters are defined environment variables. You would need to tweak this example if they are defined in some other fashion. // Access your env variables like this var str_1 = environment.variable_1 + environment.variable_2; // Or get your request parameters var str_2 = request.data[“foo”] + request.data[“bar”]; // … Read more
What is the difference between using MD5.Create and MD5CryptoServiceProvider?
System.Security.Cryptography.MD5.Create() is actually creating a MD5CryptoServiceProvider. That is why you see the same results. Looking at the definition MD5 is the base class and it’s abstract. I’m guessing they added the public create function for ease of use. public sealed class MD5CryptoServiceProvider : MD5 { } public abstract class MD5 : HashAlgorithm { } Take … Read more
Generating a MD5 Hash with Qt
PHP gives it to you in hex, Qt in binary. Convert it to hex using QByteArray::toHex. QString blah = QString(QCryptographicHash::hash((“myPassword”),QCryptographicHash::Md5).toHex())