CkPython

Manually Duplicate SetSecretKeyViaPassword

Demonstrates how to duplicate the password string to binary secret key computation of SetSecretKeyViaPassword.

This is a cryptographically weak way of generating a secret key from a password. The SetSecretKeyViaPassword method is deprecated and should not be used.

CkPython

import chilkat

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

crypt = chilkat.CkCrypt2()

# The password string is transformed to a binary secret key by computing the 
# MD5 digest (of the utf-8 password) to obtain 16 bytes.  
# If the KeyLength is greater than 16 bytes, then the MD5 digest of the Base64 encoding 
# of the utf-8 password is added.  A max of 32 bytes of key material is generated, and 
# this is truncated to the actual KeyLength required.

crypt.put_CryptAlgorithm("aes")
crypt.put_KeyLength(256)

password = "this is my password"
crypt.SetSecretKeyViaPassword(password)

# Examine the resulting SecretKey in hex:
print("Computed Secret Key = " + crypt.getEncodedKey("hex"))

# Now perform the same computation manually:
sb = chilkat.CkStringBuilder()

crypt.put_HashAlgorithm("md5")
crypt.put_Charset("utf-8")
crypt.put_EncodingMode("hex")
sb.Append(crypt.hashStringENC(password))

passwordBase64 = crypt.encodeString(password,"utf-8","base64")
sb.Append(crypt.hashStringENC(passwordBase64))

print("Manually Computed = " + sb.getAsString())

# The output is:
# Computed Secret Key = 210D53992DFF432EC1B1A9698AF9DA16C7E90518F90E24828F78EC9E0A413B36
# Manually Computed = 210D53992DFF432EC1B1A9698AF9DA16C7E90518F90E24828F78EC9E0A413B36