md5

问题 I'm currently doing this (see snippet below) to get an md5 hash string for the image files I'm uploading (I'm using the hash as fileNames ): NOTE: I'm using the md5 package to generate the hash (it's loaded into the snippet). There are 4 available methods on FileReader() to read the files. They all seem to produce good results. readAsText(file) readAsBinaryString(file); readAsArrayBuffer(file); readAsDataURL(file); Which is should I be using in this case and why? Can you also explain the

问题 Does MD5 and SHA only contain alphanumeric characters? (i.e., from A to Z and 0 to 9, or do they exclude some characters?) 回答1: 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+/]. 来源： https://stackoverflow.com/questions/12618321/what-pool-of-characters-do-md5-and

问题 Both CRC and hash methods can be used to verify the integrity of the original data. Why do most systems uses hash method nowadays? 回答1: CRC was designed to prevent transmission errors, not malicious action. Therefore, it isn't collision resistant. In particular, the linear properties of CRC codes even allow an attacker to modify a message in such a way as to leave the check value unchanged 回答2: HASH methods (ONE WAY ENCRYPTION) are more complex (and powerful) than simple check codes (CRC).

问题 I was given an excel file with about 450 username and passwords (the passwords are encoded with MD5 hash) How can I put this excel (.xls) file into my MySQL database and on the website (php side) how can I check if the user entered password is the correct password (I know nothing about hashing a password with MD5 or any hash-sequence for that matter) 回答1: 1.- You can export an excel file as a CSV file. 2.- Use phpmyadmin to import to your site a CSV file. 3.- Checking passwords: if (md5($

问题 Google provide a great documentation for their cloud services, but unfortunately nobody can understand the content. Their explanation always jumping and leave people with no clue to accomplish even a simple task. Creating tsv file should be a simple task. I tried to follow everything in this page Creating a URL List but stuck with "unknown error" log. Unknown error means I never know what I am doing wrong. They gave example downloaded file md5-test a string "Storage Transfer MD5 Test" =>

问题 I am trying to build an application that needs to compare the MD5 hash of any file. Due to specific issues, before the upload, the MD5 must be generated client side, and after the upload the application needs to check it server side. My first approach was to use, at the client side, the JavaScript File API and the FileReader.ReadAs functions. Then I use the MD5 algorithm found here: http://pajhome.org.uk/crypt/md5/ Server side, I would use PHP's fopen command and the md5 function. This

问题 I am trying to build an application that needs to compare the MD5 hash of any file. Due to specific issues, before the upload, the MD5 must be generated client side, and after the upload the application needs to check it server side. My first approach was to use, at the client side, the JavaScript File API and the FileReader.ReadAs functions. Then I use the MD5 algorithm found here: http://pajhome.org.uk/crypt/md5/ Server side, I would use PHP's fopen command and the md5 function. This

问题 I want to generate a MD5 hash of a text file in ABAP. I have not found any standard solution for generating it for a very big file. Function module CALCULATE_HASH_FOR_CHAR does not meet my requirements because it takes a string as an input parameter. Although it works for smaller files, in case of a for example 4 GB file one cannot construct such a big string. Does anybody know whether there is a standard piece of coding for doing that (my google efforts did not bring me anything) or maybe

问题 I want to compare hashes of two files. But no matter if files are different or not, even with different hashes comparison results True Here is the code: import hashlib hasher1 = hashlib.md5() afile1 = open('canvas.png', 'rb') buf1 = afile1.read() a = hasher1.update(buf1) print(str(hasher1.hexdigest())) hasher2 = hashlib.md5() afile2 = open('img5.png', 'rb') buf2 = afile2.read() b = hasher2.update(buf2) print(str(hasher2.hexdigest())) print(str(a) == str(b)) The output:

问题 I am looking for some help in getting MD5 and SHA-1 in my iPhone app. Can anybody give me an idea on how to get these? 回答1: #include <CommonCrypto/CommonDigest.h> -(NSString*) sha1:(NSString*)input { NSData *data = [input dataUsingEncoding: NSUTF8StringEncoding]; uint8_t digest[CC_SHA1_DIGEST_LENGTH]; CC_SHA1(data.bytes, data.length, digest); NSMutableString* output = [NSMutableString stringWithCapacity:CC_SHA1_DIGEST_LENGTH * 2]; for(int i = 0; i < CC_SHA1_DIGEST_LENGTH; i++) [output