hashlib

问题 Is there any simple way of generating (and checking) MD5 checksums of a list of files in Python? (I have a small program I'm working on, and I'd like to confirm the checksums of the files). 回答1: You can use hashlib.md5() Note that sometimes you won't be able to fit the whole file in memory. In that case, you'll have to read chunks of 4096 bytes sequentially and feed them to the Md5 function: def md5(fname): hash_md5 = hashlib.md5() with open(fname, "rb") as f: for chunk in iter(lambda: f.read

问题 Bellow is a code that compares hashlib.sha256() to my sha256_test() function which is written in raw python in terms of hash rate performance. from time import time_ns as time import hashlib def pad512(bytes_): L = len(bytes_)*8 K = 512 - ((L + 1) % 512) padding = (1 << K) | L return bytes_ + padding.to_bytes((K + 1)//8, 'big') def mpars (M): chunks = [] while M: chunks.append(M[:64]) M = M[64:] return chunks def sha256_transform(H, Kt, W): a, b, c, d, e, f, g, h = H # Step 1: Looping for t

问题 I was going through the Python hashlib package documentation and wanted some clarification on two hash object attributes (namely hash.block_size and hash.digest_size ). Here is the definition of each attribute: hash.digest_size = "The size of the resulting hash in bytes." hash.block_size = "The internal block size of the hash algorithm in bytes." source: https://docs.python.org/2/library/hashlib.html So I understand that hash.digest_size is simply the length or size (in bytes) of the data

问题 Anyone know how to expose python 2.x _hashlib.pyd internals using ctypes? I especially need to extract the EVP_MD_CTX struct for serialization of python HASH objects. 回答1: Mapping C structures from header files (openssl/evp.h and _hashopenssl.c in your case) is straightforward, but is not always portable across different versions. Here it is for my environment: from ctypes import * PyObject_HEAD = [ ('ob_refcnt', c_size_t), ('ob_type', c_void_p), ] class EVP_MD(Structure): _fields_ = [ ('type

问题 I'm having a hell of a time getting S3 to accept uploads via CORS POST request generated by PhoneGap (Cordova) FileTransfer.upload(). Any suggestions as to what I may be missing would be appreciated. Currently I'm getting a 403 AccessDenied response using the code below. I've been over it many times comparing with S3's documentation, and can't figure out the problem. Here is the Python code that generates the signature: # Create policy document for S3. policy_obj = {"expiration": "2014-01

问题 This example works fine example: import hashlib m = hashlib.md5() m.update(b"Nobody inspects") r= m.digest() print(r) Now, I want to do the same thing but with a variable: var= "hash me this text, please" . How could I do it following the same logic of the example ? 回答1: The hash.update() method requires bytes , always. Encode unicode text to bytes first; what you encode to is a application decision, but if all you want to do is fingerprint text for then UTF-8 is a great choice: m.update(var

问题 Is there any other module for md5? 回答1: It is in hashlib import hashlib print(hashlib.md5('asd'.encode()).hexdigest()) 回答2: It has been deprecated since version 2.5. You must use hashlib. 回答3: From: http://www.python.org/dev/peps/pep-0004/ MD5 have been replaced by the 'hashlib' module. 来源： https://stackoverflow.com/questions/4954602/replacement-for-md5-module-in-python-3

问题 I'm porting over a Django site to Node.js and I am trying to re implement the Django set password method in Node. This is the Django code from django.utils.crypto import ( pbkdf2, get_random_string) import hashlib password = 'text1' algorithm = "pbkdf2_sha256" iterations = 10000 salt = 'p9Tkr6uqxKtf' digest = hashlib.sha256 hash = pbkdf2(password, salt, iterations, digest=self.digest) hash = hash.encode('base64').strip() print "%s$%d$%s$%s" % (self.algorithm, iterations, salt, hash) and here

问题 My current approach is this: def get_hash(path=PATH, hash_type='md5'): func = getattr(hashlib, hash_type)() with open(path, 'rb') as f: for block in iter(lambda: f.read(1024*func.block_size, b''): func.update(block) return func.hexdigest() It takes about 3.5 seconds to calculate the md5sum of a 842MB iso file on an i5 @ 1.7 GHz. I have tried different methods of reading the file, but all of them yield slower results. Is there, perhaps, a faster solution? EDIT: I replaced 2**16 (inside the f

问题 Running mkpasswd -m sha-512 -S salt1234 password results in the following: $6$salt1234$Zr07alHmuONZlfKILiGKKULQZaBG6Qmf5smHCNH35KnciTapZ7dItwaCv5SKZ1xH9ydG59SCgkdtsTqVWGhk81 I have this snippet of Python code that I thought would output the same, but isn't: import hashlib, base64 print(base64.b64encode(hashlib.sha512('password' + 'salt1234').digest())) It instead results in: nOkBUt6l7zlKAfjtk1EfB0TmckXfDiA4FPLcpywOLORZ1PWQK4+PZVEiT4+9rFjqR3xnaruZBiRjDGcDpxxTig== Not sure what I am doing wrong