CkPython Requires Chilkat v11.0.0+

RSA Encrypt with SHA-256 hash function and SHA-256 mask function

See more RSA Examples

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.

CkPython

import sys
import chilkat

success = False

#  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 == False):
    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-256 for the mask function.
rsa = chilkat.CkRsa()
rsa.put_PkcsPadding(False)
rsa.put_OaepHash("SHA256")
rsa.UsePublicKey(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() == False):
    print(rsa.lastErrorText())
    sys.exit()

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