Chilkat Examples

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Python Examples


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(Python) RSA Encrypt with SHA-256 hash function and SHA-1 mask function

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

#  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.
crypt = chilkat.CkCrypt2()
crypt.put_HashAlgorithm("SHA-256")
hashBytes = chilkat.CkByteData()
success = crypt.HashString(originalData,hashBytes)

#  Now to RSA encrypt using 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")

#  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.encryptBytesENC(hashBytes,bUsePrivateKey)
if (rsa.get_LastMethodSuccess() != True):
    print(rsa.lastErrorText())
    sys.exit()

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

 

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