Code to split encipher.it ciphertexts into constituent parts

split-enct2.py

#!/usr/bin/env python3

import base64

ct = 'EnCt22bbdc932ace27197eff234c409c2550cc882a4c92bbdc932ace27197eff234c4GMRUZdNqXgHr7zwU7FbknCNZzGy2Z143IJuZ3Q==IwEmS'
ct = ct[5:]   # trim 'EnCt2' header
ct = ct[:-5]  # trim 'IwEmS' footer

hash = bytes.fromhex(ct[:64])
hmac = bytes.fromhex(ct[:40])
assert hash.startswith(hmac)

salt = ct[64:72]

text = base64.b64decode(ct[72:])
nonce, text = text[:8], text[8:]

def format_cstring(bytes):
  return ''.join('\\x' + hex(b)[2:].rjust(2, '0') for b in bytes)

print('  char *salt = \"%s\";' % salt)
print('  uint8_t *hmac = \"%s\";' % format_cstring(hmac))
print('  uint8_t *nonce = \"%s\";' % format_cstring(nonce))
print('  uint8_t *ciphertext = \"%s\";' % format_cstring(text))