Chilkat2-Python

RSA Encrypt Hash using SHA256 hash function and SHA1 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.

Chilkat2-Python

import sys
import chilkat2

success = False

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

pubkey = chilkat2.PublicKey()

sbPem = chilkat2.StringBuilder()
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 to get the hash in base64 format:
crypt = chilkat2.Crypt2()
crypt.HashAlgorithm = "SHA-256"
crypt.EncodingMode = "base64"
hashBase64 = crypt.HashStringENC(originalData)

# Setup RSA to use OAEP padding with SHA-1 for the mask function.
rsa = chilkat2.Rsa()
rsa.PkcsPadding = False
rsa.OaepHash = "SHA256"
rsa.UsePublicKey(pubkey)
rsa.EncodingMode = "base64"

# 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.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.LastMethodSuccess == False):
    print(rsa.LastErrorText)
    sys.exit()

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