Online SHA256 Hash Generator

In a C program, I can change the internal state of the SHA256 algo as follows:

SHA256_CTX c;SHA256_Init(&c);for (i =0; i<64; i++)    SHA256_Update(&c, "$", 1);# 0x44332211 is just for examplec.h[0] = htole32(0x44332211);c.h[1] = htole32(0x44332211);c.h[2] = htole32(0x44332211);c.h[3] = htole32(0x44332211);c.h[4] = htole32(0x44332211);c.h[5] = htole32(0x44332211);c.h[6] = htole32(0x44332211);c.h[7] = htole32(0x44332211);

Python provides hashlib.sha256. I want to ask if there is any way in which the internal state of sha256 algo can be updated in Python similar to what I did in C above ?

As a part of IEFT standard, I need to hash the body of a JSON request.

I have a reference code in JS that is known to produce the right hash, but now I'm stuck with matching the result in Python.

The JSON body:

body = {"description":"Test ticket"}

The JS code:

bodyHash = CryptoJS.SHA256(body).toString(CryptoJS.enc.Base64)

Please note it's not JSON.stringify(body)! The "correct" hash (the one I'm looking to match):

TqXFCKZWbnYkBUP4/rBv1Fd3e+OVScQBZDav2mXSMw4=

The Python solution should be along the lines of:

body_hash = base64.b64encode(hashlib.sha256(repr(body).encode('utf-8')).digest()).decode('ascii')

Which produces something different:

z0RpYmKAIfVibpSLJx/iRDZaNHJkJ2+rcenc1KEEAUw=

Is there even a way to match those hashes? How the JS object is hashed in CryptoJS?

This specific case is coming whenever i tried to encrypt single char strings in application. When i tried to encrypt the same string with main method then i was able to encrypt it. But when i run with the application then this specific issue is coming. I felt this is strange because it is working with the main method.

My encryption code will be as follows.

public static String encryptWithAES256(String strToEncrypt) throws Exception{    MessageDigest digest = MessageDigest.getInstance("SHA-256");    byte[] encodedhash = digest.digest(KEY.getBytes(StandardCharsets.UTF_8));    IvParameterSpec ivspec = new IvParameterSpec(Arrays.copyOf(KEY.getBytes(),16));    SecretKeySpec secretKey = new SecretKeySpec(encodedhash, AES_ENCRYPTION_ALGORITHM);    Cipher cipher = Cipher.getInstance(CIPHER_TRANSFORMATION);    cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivspec);    return new String(Base64.encodeBase64(cipher.doFinal(strToEncrypt.getBytes(CHARACTER_ENCODING))));}

I have a piece of code that converting email addresses to HASH using SHA256 algorithm. When running the code, the expected results are presented, but when i'm trying to output the results - i'm getting an error :ValueError: I/O operation on closed file

import osimport hashlibwith open("emails.txt", "r") as text:    for line in text.readlines():        line = line.rstrip("\n")        m = hashlib.sha256(line)        print(m.hexdigest())with open("Output.txt", "w") as text_file:    for row in text:        print row        text_file.write("%s\n" % str(row))

can anyone help me to get all the results to external file?

Suppose a user designed a new scheme to detect whether a message is modified by an attacker (protecting data integrity). The scheme is to append to each message a SHA-256 hash of that message. Will there be any vulnerability in the design?