I coding up the following pretty quickly and don’t have time to really test it here at work, but it ought to do the job. Let me know if you find any issues with it and I’ll take a look. This should properly flatten out and sort the arrays and hashes, and you’d need to … Read more
MD5 and SHA hashes in raw form are binary, however their common representation is a hex-encoded string, which contains characters [a-fA-F0-9]. So if this is what you meant, then characters G-Z, g-z are “excluded”. Another, less common, representation is Base64 encoding [0-9a-zA-Z+/].
HMAC is not susceptible to length extension attacks. md5(T + K) should be fine for most uses unless your adversary is motivated to tamper with your message and has very good computing power. As long as you control T, birthday attacks are not applicable and you only have brute-force attacks. But it is good to … Read more
This is what I came up with. It’s an extension to String. Don’t forget to add #import <CommonCrypto/CommonCrypto.h> to the ObjC-Swift bridging header that Xcode creates. extension String { var md5: String! { let str = self.cStringUsingEncoding(NSUTF8StringEncoding) let strLen = CC_LONG(self.lengthOfBytesUsingEncoding(NSUTF8StringEncoding)) let digestLen = Int(CC_MD5_DIGEST_LENGTH) let result = UnsafeMutablePointer<CUnsignedChar>.alloc(digestLen) CC_MD5(str!, strLen, result) let hash = … Read more
ETag is similar to the Last-Modified header. It’s a mechanism to determine change by the client. An ETag needs to be a unique value representing the state and specific format of a resource (a resource could have multiple formats that each need their own ETag). Not unique across the entire domain of resources, simply within … Read more
Assuming uniform spread in the range of MD5 and SHA-1 hashes for random strings (which isn’t the case), and assuming we’re only talking about two strings and not talking about a pool of strings (so we avoid birthday-paradox-type complexities): An MD5 hash is 128 bits wide, and SHA-1’s is 160. With the above assumptions, two … Read more
You can check using the following function: function isValidMd5($md5 =”) { return preg_match(‘/^[a-f0-9]{32}$/’, $md5); } echo isValidMd5(‘5d41402abc4b2a76b9719d911017c592′); The MD5 (Message-digest algorithm) Hash is typically expressed in text format as a 32 digit hexadecimal number. This function checks that: It contains only letters and digits (a-f, 0-9). It’s 32 characters long.
An MD5 or SHA1 hash in PHP returns a hexadecimal number, so all you need to do is convert bases. PHP has a function that can do this for you: $bignum = hexdec( md5(“test”) ); or $bignum = hexdec( sha1(“test”) ); PHP Manual for hexdec Since you want a limited size number, you could then … Read more
edit: NB these instructions have changed slightly for the v3 API I’ve figured out a quick way to get the MD5 checksums of the files uploaded and decided to share it here, too. Log into your Google Drive account, then: Visit: https://developers.google.com/drive/v3/reference/files/list Scroll down to the Try it! section. Change “Authorize requests using OAuth 2.0” … Read more
Use JDK version 1.6 instead of 1.7 because 1.7 generates the fingerprint with SHA1 by default. or you can use (-v) option of the keytool to give you all supported algorithms output and you will find the MD5 in it. for examble : keytool -v -list -keystore [your keystore path] and then enter the password … Read more