Chilkat Examples

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(Python) RSA Encrypt Hash using SHA256 hash function and SHA1 mask function

Note: This example requires a feature introduced in Chilkat v9.5.0.66

How can this Javascript be duplicated using Chilkat?

function a(e, t) {
                var r = s.pki.publicKeyFromPem(e)
                  , n = r.encrypt(t, "RSA-OAEP", {
                    md: s.md.sha256.create(),
                    mgf1: {
                        md: s.md.sha1.create()
                    }
                });
                return s.util.encode64(n)
            }

Note: The OAEP padding uses random bytes in the padding, and therefore each time encryption happens, even using the same data and key, the result will be different -- but still valid. One should not expect to get the same output.

Chilkat Python Downloads

Python Module for Windows, Linux, MAC OS X,
Solaris, FreeBSD, and ARM Embedded Linux

import sys
import chilkat

#  Note: This example requires a feature introduced in Chilkat v9.5.0.66

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

pubkey = chilkat.CkPublicKey()

sbPem = chilkat.CkStringBuilder()
bCrlf = True
sbPem.AppendLine("-----BEGIN PUBLIC KEY-----",bCrlf)
sbPem.AppendLine("MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA33TqqLR3eeUmDtHS89qF",bCrlf)
sbPem.AppendLine("3p4MP7Wfqt2Zjj3lZjLjjCGDvwr9cJNlNDiuKboODgUiT4ZdPWbOiMAfDcDzlOxA",bCrlf)
sbPem.AppendLine("04DDnEFGAf+kDQiNSe2ZtqC7bnIc8+KSG/qOGQIVaay4Ucr6ovDkykO5Hxn7OU7s",bCrlf)
sbPem.AppendLine("Jp9TP9H0JH8zMQA6YzijYH9LsupTerrY3U6zyihVEDXXOv08vBHk50BMFJbE9iwF",bCrlf)
sbPem.AppendLine("wnxCsU5+UZUZYw87Uu0n4LPFS9BT8tUIvAfnRXIEWCha3KbFWmdZQZlyrFw0buUE",bCrlf)
sbPem.AppendLine("f0YN3/Q0auBkdbDR/ES2PbgKTJdkjc/rEeM0TxvOUf7HuUNOhrtAVEN1D5uuxE1W",bCrlf)
sbPem.AppendLine("SwIDAQAB",bCrlf)
sbPem.AppendLine("-----END PUBLIC KEY-----",bCrlf)

#  Load the public key object from the PEM.
success = pubkey.LoadFromString(sbPem.getAsString())
if (success != True):
    print(pubkey.lastErrorText())
    sys.exit()

originalData = "This is the original data to be SHA-256 hashed and RSA encrypted."

#  First we SHA-256 hash the original data to get the hash in base64 format:
crypt = chilkat.CkCrypt2()
crypt.put_HashAlgorithm("SHA-256")
crypt.put_EncodingMode("base64")
hashBase64 = crypt.hashStringENC(originalData)

#  Setup RSA to use OAEP padding with SHA-1 for the mask function.
rsa = chilkat.CkRsa()
rsa.put_OaepPadding(True)
rsa.put_OaepHash("SHA1")
rsa.ImportPublicKeyObj(pubkey)
rsa.put_EncodingMode("base64")

#  Starting in v9.5.0.66, we can provide a binary encoding mode, such as "base64", "hex", "base64url", etc.
#  for the Charset property.   The Charset property was previously limited to character encodings, such as
#  "utf-8", "iso-8859-1", etc.  If a binary encoding is used, then the string passed in is decoded to the binary
#  bytes as indicated.  (If an actual charset, such as "utf-8" is used, then the input string is converted to the
#  byte representation of the charset, and then encrypted.)

#  Given that a hash is composed of non-text binary bytes, we'll set the Charset property equal to "base64"
#  (because we have the base64 hash from above).
rsa.put_Charset("base64")

#  Note: The OAEP padding uses random bytes in the padding, and therefore each time encryption happens,
#  even using the same data and key, the result will be different --  but still valid.  One should not expect
#  to get the same output.
bUsePrivateKey = False
encryptedStr = rsa.encryptStringENC(hashBase64,bUsePrivateKey)
if (rsa.get_LastMethodSuccess() != True):
    print(rsa.lastErrorText())
    sys.exit()

print("Base64 RSA encrypted output: " + encryptedStr)

 

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