md5

问题 I want to make it very clear and simple. What if I have 1gb ram and I'm trying to calculate md5 hash of 2gb file? Currently, I'm doing it this way: private static string Md5Hash(byte[] input) { byte[] hash = MD5.Create().ComputeHash(input); StringBuilder builder = new StringBuilder(32); foreach(byte b in hash) { builder.Append(b.ToString("X2")); } return builder.ToString(); } // I'm using it like: 'Md5.AsString(File.ReadAllBytes(filePath))' So what are your suggestions? 回答1: Rather than

问题 I'm doing a bit of reading on hashing for passwords. I've seen that SHA-256 > MD5. This got me thinking about how an app may deal with changing from one hashing function to another. What happens if someone implements an app that hashes their passwords using MD5. They then decide that SHA-256 is the way to go. But of course the password hashes stored in the database are in MD5. What is the process for migrating the data in the database from one hashing function to another? 回答1: It is not

问题 Have simple Spring Security webapp with password encoding: <security:authentication-manager alias="authenticationManager"> <security:authentication-provider user-service-ref="personService"> <security:password-encoder hash="md5" ref="passwordEncoder"> <!-- <security:salt-source user-property="username"/> --> </security:password-encoder> </security:authentication-provider> </security:authentication-manager> Encoding also simple: person.setPassword(encoder.encodePassword(person.getPassword(),

问题 I need to get a base64-encoded MD5 hash of an object, where the object is an image stored as a file, fname. I've tried this: def get_md5(fname): hash = hashlib.md5() with open(fname) as f: for chunk in iter(lambda: f.read(4096), ""): hash.update(chunk) return hash.hexdigest().encode('base64').strip() However, I don't think this is right because it returns a string with too many characters. My understanding is that it needs to be 24 characters long. I get

问题 I need to calculate the checksum of a csv file. The checksum will change every time the data in the file is changed. I found nothing useful over the internet in this regard. 回答1: First of all, this problem is not specific to JSP. JSP is just a HTML code generator. Writing Java code in a JSP file instead of a normal Java class doesn't make it a JSP problem. You would help yourself more if you concentrate on solving future Java problems using the "Java" keyword, not using the "JSP" keyword.

问题 i'm triing to get this code to work on j2me (it is working a java program) but not yet in j2me public static String generate(String plaintext, String passphase) throws Exception { try { PBEKeySpec pbeKeySpec = new PBEKeySpec(passphase.toCharArray()); PBEParameterSpec pbeParamSpec; SecretKeyFactory keyFac; // Salt byte[] salt = {(byte) 0xc8, (byte) 0x73, (byte) 0x61, (byte) 0x1d, (byte) 0x1a, (byte) 0xf2, (byte) 0xa8, (byte) 0x99}; // Iteration count int count = 20; // Create PBE parameter set

问题 I know there's plenty of other questions out there with a similar topic but I can't find one that creates a solution to my specific problem. I have a Java Application that connects via JDBC to Lamp for a Uni project and I'm trying to compare the inputted password to the password related to the login they also entered in the MySQL database. I have a hashing (MD5) method that will hash the users input but it keeps throwing a null pointer exception and I can't fix it! on button press code:

问题 I am programming a new site in JSF. At the moment i program the Login. I used md5 some years ago, but with Rainbow Tables i think its noch safe anymore. So, how should i store the Password in the Database ? 回答1: Here is excellent, detailed guide: https://www.nccgroup.trust/us/about-us/newsroom-and-events/blog/2007/july/enough-with-the-rainbow-tables-what-you-need-to-know-about-secure-password-schemes/ 回答2: The first thing you want to do is look for a pre-built system from your vendor. You

问题 I have an existing database. users : username => varchar password => md5 hashing I am new to laravel, I was try to create simple login and register from laravel docs, thats work fine, but in docs are create for laravel, now I want to create same login/register but with existing datas. I was read some Question from How to use SHA1 encryption instead of BCrypt in Laravel 4? but I dont understand how to use it. any adv? sory for my bad grammer. 回答1: I'll Try to answer my question. I take it from

问题 In Oracle SQL, is there an MD5 function or something available to me? I would like to do something like... select name, md5_sum( name ) from person; 回答1: See this Tahiti Link. Under MD5 Procedures and Functions it says These subprograms generate MD5 hashes of data. The MD5 algorithm ensures data integrity by generating a 128-bit cryptographic message digest value from given data. Also note, that DBMS_OBFUSCATION_TOOLKIT is deprecated and can/should be replaced with DBMS_CRYPTO , see this