hash

问题 In javascript, is it possible to use the browser built-in sha256 hash (https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/digest#Converting_a_digest_to_a_hex_string) inside a synchronous function? Ideally, I'd like to do something like String.prototype.sha256 = function() { // ... return hash } I already tried things like (async() => {hash = await digestMessage(message); return hash})() , but I can only get back the promise object. It seems to me that it might not be possible to

问题 I have a lists of integers that I would like to use as keys in python dictionaries. I'm caching results from a function(s) that takes a list of ints as input. My current solution: list_of_ints = [1,20,3,4] key = str(sorted(list_of_ints))[1:-1].replace(' ','') which generates the key '1,3,4,20'. Seems like there should be a faster/prettier/more-pythonic way to do this. 回答1: Just use a tuple as a key. Tuples are immutable and hashable, so they're useful as dictionary keys. list_of_ints = [1, 20

问题 I have been comparing hash values between multiple systems and was surprised to find that PowerShells hash values are different than that of other terminals. Linux terminals (CygWin, Bash for Windows, etc.) and Windows Command Prompt are all showing the same hash where as PowerShell is showing a different hash value. This was tested using SHA256 but found the same issue when using other algorithms like md5. Encoding Update: Tried changing the PShell encoding but it did not have any effect on

问题 I have been comparing hash values between multiple systems and was surprised to find that PowerShells hash values are different than that of other terminals. Linux terminals (CygWin, Bash for Windows, etc.) and Windows Command Prompt are all showing the same hash where as PowerShell is showing a different hash value. This was tested using SHA256 but found the same issue when using other algorithms like md5. Encoding Update: Tried changing the PShell encoding but it did not have any effect on

问题 I'm making a little utility to help me remember passwords by repetition. I'd like to enter password to be remembered only once every day and not before each session. Of course, I wouldn't store a password itself, but would gladly store its hash. So, what are the easiest ways to get a hash from std::string using the C++ Standard Library? 回答1: For a quick solution involving no external libraries, you can use hash<std::string> to hash string s. It's defined by including the header files hash_map

问题 I'm working with sets of integer matrices, and I thought representing them as tuples made sense, as they are hashable. However the hash() function gave me strange results for tuples: hash(((1, -1, 0), (1, 0, 0), (1, 0, -1))) Out[147]: -697649482279922733 hash(((1, 0, -1), (1, 0, 0), (1, -1, 0))) Out[148]: -697649482279922733 As you can see, these two different tuples have the same hash value. Note that they are actually pretty similar (exchange of the first and last subtuples), however I

问题 Hereafter, we use N4140 (C++14 Standard). According to § 17.6.3.4 Hash requirements , The value returned shall depend only on the argument k for the duration of the program . [ Note: Thus all evaluations of the expression h(k) with the same value for k yield the same result for a given execution of the program . — end note ] and § 20.9.12 Class template hash says ... the instantiation hash<Key> shall: (1.1) — satisfy the Hash requirements (17.6.3.4) ... (1.2) — ... This means a hash value of

问题 I have read some texts about strong collision resistance and weak collision resistance, but I was unable to understand the difference. The only thing I can understand that there is a low probability of collision in hash functions which have weak collision resistance, and a higher probability of collision in strong collision resistance hash functions. I could not understand what is the real thing, what is the significance of these parameters. Can anyone help me on this ? 回答1: The weak

问题 I am migrating my legacy ASP.NET webforms application to start using the ASP.NET build-in DefaultMembershipProvider. My old homebrewn authenticationmodule used to store SHA256 hashes of passwords. I figured that 'upgrading' to the DefaultMembershipProvider, which also stores hashes in the SQL DB, would mean that I could migrate these hashes as well and therefore offer painless upgrade for current users (so they wouldn't have to reset their password). Now, this didn't quite work as planned

问题 I tried to find this information around the Docker official docs, but had no success. Which pieces of information does Docker take into account when calculating the hash of each commit/layer? It's pretty obvious that the line in the Dockerfile is part of the hash and, of course, the parent commit hash. But is something else take into account when calculating this hash? Concrete use case: Let's suppose I have two devs in different machines, at different points in time (and because of that,