hash

问题 When I go to the System.Security.Cryptography namespace, I can only see SHA1 , SHA256 , HMACSHA1 etc classes there. But actually, there is a SHA1Managed class, as well as SHA256Managed , which I don't see? When I write it out manually - everything works as expected. Is this hidden intentionally? And what's the difference between simply instancing a managed version of those, versus for example calling their factory methods ( SHA1.Create() or SHA256.Create() )? Are they the same thing? 回答1: Can

问题 Say we have the following urls: 1. http://example.com#hash0 2. http://example.com#hash0#hash1 3. http://example.com#hash0/sample.net/ 4. http://example.com#hash0/sample.net/#hash1 5. http://example.com#hash0/image.jpg 6. http://example.com#hash0/image.jpg#hash1 7. something.php#?type=abc&id=123 8. something.php#?type=abc&id=123#hash0 9. something.php/?type=abc&id=#123 .................................... and more permutations of this kind, you got the point. How can I selectively remove the

问题 The objective is to compute the SHA1 hash of a buffer or multiple buffers as part of a C++ program. 回答1: I'm not sure whether the one using boost's UUID will do leading zeros in hash values correctly (your string should always have the same length afaik), so here's a simplified version of the example above which will do that: #include <cstdio> #include <string> #include <boost/uuid/sha1.hpp> std::string get_sha1(const std::string& p_arg) { boost::uuids::detail::sha1 sha1; sha1.process_bytes(p

问题 I have a list that stores well over a million objects within it. I need to look through the list and update the objects found through the below query as efficiently as possible. I was thinking of using a Dictionary or HashSet, but I'm relatively new to C# and could not figure out how to implement these other two approaches. My current code is simply a LINQ statement searching through an IList. public IList<LandObject> landObjects = new List<LandObject>(); var lObjsToUpdate = from obj in

问题 I have two databases for logging stuff, which I want to check for synchronization. The solution approved is to send periodically (lets say hourly) a select to both, generate a hash of the result set and compare them. If they match then great, otherwise generate some alarms. Currently I'm doing it by (bash script): log_table="SELECT column1, column2, column3 FROM log_table where to_char(timestamp, '$ts_format') = '$tx_moment'"; PSQL="psql -t -q -h $_gp_host -U $_gp_user -d log_schema -c ";

问题 I am using the following code to hash (and hopefully salt) user passwords before I store them in my DB. // hash the password before the user is saved ConsultantSchema.pre('save', function(next) { var user = this; // hash the password only if the password has been changed or user is new if (!user.isModified('password')) return next(); // generate the hash bcrypt.hash(user.password, null, null, function(err, hash) { if (err) { logger.error("bcrypt.hash "+err); return next(err); } // change the

问题 I'm quite struggling on this issue. I've stored a Hashie::Mash into a string, and I'm having a hard time restoring it back as a hash. Here's the string: "--- !map:Hashie::Mash \ncreated_at: Mon Jul 30 15:42:20 +0000 2012\nid: 229965155759439872\nid_str: \"229965155759439872\"\ntext: \"#streetart encore plus impressionnant de plus pr\\xC3\\xA8s http://t.co/lUUmXFYs\"\nsource: <a href=\"http://twicca.r246.jp/\" rel=\"nofollow\">twicca</a>\ntruncated: false\nin_reply_to_status_id: \nin_reply_to

问题 I created a class "Book": public class Book { public static int idCount = 1; private int id; private String title; private String author; private String publisher; private int yearOfPublication; private int numOfPages; private Cover cover; ... } And then i need to override the hashCode() and equals() methods. @Override public int hashCode() { int result = id; // !!! result = 31 * result + (title != null ? title.hashCode() : 0); result = 31 * result + (author != null ? author.hashCode() : 0);

问题 I am using the following code to hash (and hopefully salt) user passwords before I store them in my DB. // hash the password before the user is saved ConsultantSchema.pre('save', function(next) { var user = this; // hash the password only if the password has been changed or user is new if (!user.isModified('password')) return next(); // generate the hash bcrypt.hash(user.password, null, null, function(err, hash) { if (err) { logger.error("bcrypt.hash "+err); return next(err); } // change the

问题 For a small project, I'm making an iOS app which should do two things: take a picture take a hash from the picture data (and print it to the xcode console) Then, I want to export the picture to my laptop and confirm the hash. I tried exporting via AirDrop, Photos.app, email and iCloud (Photos.app compresses the photo and iCloud transforms it into an .png ). Problem is, I can't repodruce the hash. This means that the exported picture differs from the picture in the app. There are some