md5

What kind of hash algorithm is used for Hive's built-in HASH() Function

由 南楼画角 提交于 2019-11-30 09:19:09
What kind of hashing algorithm is used in the built-in HASH() function? I'm ideally looking for a SHA512/SHA256 hash, similar to what the SHA() function offers within the linkedin datafu UDFs for Pig. HASH function (as of Hive 0.11) uses algorithm similar to java.util.List#hashCode . Its code looks like this: int hashCode = 0; // Hive HASH uses 0 as the seed, List#hashCode uses 1. I don't know why. for (Object item: items) { hashCode = hashCode * 31 + (item == null ? 0 : item.hashCode()); } Basically it's a classic hash algorithm as recommended in the book Effective Java. To quote a great man

How to get the MD5 hex hash for a file using VBA?

由 主宰稳场 提交于 2019-11-30 07:01:07
问题 How can I get the MD5 hex hash for a file using VBA? I need a version that works for a file. Something as simple as this Python code: import hashlib def md5_for_file(fileLocation, block_size=2**20): f = open(fileLocation) md5 = hashlib.md5() while True: data = f.read(block_size) if not data: break md5.update(data) f.close() return md5.hexdigest() But in VBA. 回答1: http://www.di-mgt.com.au/crypto.html#MD5 回答2: An older question that could use a better answer. These functions are specifically

CommonCrypto is no longer part of the iPhone SDK - Where else can I easily get an MD5 function?

由 冷暖自知 提交于 2019-11-30 06:48:31
问题 So as many of you may already know, CommonCrypto isn't included in the iPhone SDK anymore (as on 3.0). Where else can I easily get hold of an MD5 function? Am I going to have to compile OpenSSL into my project just to get MD5?? A few clarifications: This isn't for security This is going to be used with an API that requires an MD5 digest of a string. I have no control over this API. If I could use SHA256, I would. I'm all for moving forward, but I can't change the API. Edit It seems I was

Combining MD5 hash values

由 笑着哭i 提交于 2019-11-30 06:48:08
When calculating a single MD5 checksum on a large file, what technique is generally used to combine the various MD5 values into a single value? Do you just add them together? I'm not really interested in any particular language, library or API which will do this; rather I'm just interested in the technique behind it. Can someone explain how it is done? Given the following algorithm in pseudo-code: MD5Digest X for each file segment F MD5Digest Y = CalculateMD5(F) Combine(X,Y) But what exactly would Combine do? Does it add the two MD5 digests together, or what? In order to calculate MD5 values

Computing MD5SUM of large files in C#

由 寵の児 提交于 2019-11-30 06:46:57
问题 I am using following code to compute MD5SUM of a file - byte[] b = System.IO.File.ReadAllBytes(file); string sum = BitConverter.ToString(new MD5CryptoServiceProvider().ComputeHash(b)); This works fine normally, but if I encounter a large file (~1GB) - e.g. an iso image or a DVD VOB file - I get an Out of Memory exception. Though, I am able to compute the MD5SUM in cygwin for the same file in about 10secs. Please suggest how can I get this to work for big files in my program. Thanks 回答1: I

What does & 0xff do And MD5 Structure?

由 霸气de小男生 提交于 2019-11-30 06:41:24
问题 import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; public class JavaMD5 { public static void main(String[] args) { String passwordToHash = "MyPassword123"; String generatedPassword = null; try { MessageDigest md = MessageDigest.getInstance("MD5"); md.update(passwordToHash.getBytes()); byte[] bytes = md.digest(); StringBuilder sb = new StringBuilder(); for (int i = 0; i < bytes.length; i++) { sb.append(Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1)

Java - PBKDF2 with HMACSHA256 as the PRF

由 只愿长相守 提交于 2019-11-30 06:30:11
问题 I've been given the task of creating a Login API for our project and I'm supposed to use PBKDF2 with HMACSHA256 as the PRF. The plain text password is hashed using MD5 and then fed into the PBKDF2 to generate a derived key. The problem is, I'm not able to get the same output as what the project documentation is telling me. Here's the PBKDF2 Implementation in Java: public class PBKDF2 { public static byte[] deriveKey( byte[] password, byte[] salt, int iterationCount, int dkLen ) throws java

How do I calculate the md5 checksum of a file in Python?

由 牧云@^-^@ 提交于 2019-11-30 06:13:26
问题 I have made a code in python that checks for an md5 in a file and makes sure the md5 matches that of the original. Here is what I have developed: #Defines filename filename = "file.exe" #Gets MD5 from file def getmd5(filename): return m.hexdigest() md5 = dict() for fname in filename: md5[fname] = getmd5(fname) #If statement for alerting the user whether the checksum passed or failed if md5 == '>md5 will go here<': print("MD5 Checksum passed. You may now close this window") input ("press enter

How does MD5Sum algorithm work?

由 |▌冷眼眸甩不掉的悲伤 提交于 2019-11-30 06:06:13
Md5sum is used to check integrity of iso image of say ubuntu.How does it work? The algorithm Message Digest 5 or MD5, it is a one-way cryptographic hash function. MD5 performs many binary operations on the "message" (binary data, for example of an iso image) to compute a 128-bit "hash". It is useful to check the integrity of a downloaded package such as ubuntu because generating the MD5 hash will be identical if the package is exactly the same as the authenticated source. If there are errors in the download (from network interference, etc.) or if you downloaded a malicious package that was

XSLT: Obtaining or matching hashes for base64 encoded data

由 大城市里の小女人 提交于 2019-11-30 05:50:28
I need to find a way to find a way to find the hash for the base64 encoded data in the XML node //note/resource/data , or somehow otherwise match it to the hash value in the node //note/content/en-note//en-media@hash See below for the full XML file Please suggest a way to {obtain|match} using XSLT 4aaafc3e14314027bb1d89cf7d59a06c {from|with} R0lGODlhEAAQAPMAMcDAwP/crv/erbigfVdLOyslHQAAAAECAwECAwECAwECAwECAwECAwECAwEC AwECAyH/C01TT0ZGSUNFOS4wGAAAAAxtc09QTVNPRkZJQ0U5LjAHgfNAGQAh/wtNU09GRklDRTku MBUAAAAJcEhZcwAACxMAAAsTAQCanBgAIf8LTVNPRkZJQ0U5LjATAAAAB3RJTUUH1AkWBTYSQXe8 fQAh
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