(CkPython) Generate RSA Key and Export to PKCS1 / PKCS8

CkPython example code showing how to generate an RSA public/private key and save to PKCS1 and PKCS8 format files. In a PKCS1 or PKCS8 formatted file, the key is stored in binary ASN.1 format (and ASN.1 is itself written according to DER -- Distinguished Encoding Rules). A PEM file simply contains the binary ASN.1 base64 encoded and delimited by BEGIN/END lines. PKCS1 format files are never encrypted. PKCS8 can be encrypted or unencrypted. Public keys are never encrypted (there is no need). Private keys *should* always be encrypted - unless perhaps the unencrypted private key is obtained and itself stored in some sort of secure place.

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import sys
import chilkat

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

rsa = chilkat.CkRsa()

# Generate a 2048-bit key.  Chilkat RSA supports
# key sizes ranging from 512 bits to 8192 bits.
success = rsa.GenerateKey(2048)
if (success != True):
    print(rsa.lastErrorText())
    sys.exit()

# Get the public and private key parts:
# pubKey is a CkPublicKey
pubKey = rsa.ExportPublicKeyObj()
# privKey is a CkPrivateKey
privKey = rsa.ExportPrivateKeyObj()

# Get the public key as a PKCS8 PEM string
pubKeyPem = pubKey.getPem(False)
print(pubKeyPem)

# Get the public key in PKCS8 format, in a Base64 encoded string.
pubKeyPkcs8Base64 = pubKey.getEncoded(False,"base64")
print(pubKeyPkcs8Base64)

# Get the public key in PKCS1 format, in a Base64 encoded string.
pubKeyPkcs1Base64 = pubKey.getEncoded(True,"base64")
print(pubKeyPkcs1Base64)

# Get the private key in a PKCS8 PEM string.
privKeyPem = privKey.getPkcs8Pem()
print(privKeyPem)

# Get the private key in a PKCS8 encrypted PEM string.
privKeyEncPem = privKey.getPkcs8EncryptedPem("myPassword")
print(privKeyEncPem)

# Get the private key in PKCS1 Base64 format
privKeyPkcs1Base64 = privKey.getPkcs1ENC("base64")
print(privKeyPkcs1Base64)

# Get the private key in PKCS8 Base64 format
privKeyPkcs8Base64 = privKey.getPkcs8ENC("base64")
print(privKeyPkcs8Base64)

# Save to PKCS1 / PKCS8 / PEM files...

# Save the public key to PKCS8 binary DER
success = pubKey.SaveDerFile(False,"pubKey_pkcs8.der")

# Save the public key to PKCS1 binary DER
success = pubKey.SaveDerFile("pubKey_pkcs1.der")

# Save the private key to unencrypted binary PKCS1 DER.
# Note: PKCS1 is never found in an encrypted format. 
success = privKey.SavePkcs1File("privKey_pkcs1.der")

# Save the private key to unencrypted binary PKCS8
success = privKey.SavePkcs8File("privKey_pkcs8.der")

# Save the private key to encrypted binary PKCS8
success = privKey.SavePkcs8EncryptedFile("myPassword","privKey_enc_pkcs8.der")

# Save the private key to unencrypted PKCS8 PEM
success = privKey.SavePkcs8PemFile("privKey.pem")

# Save the private key to encrypted PKCS8 PEM
success = privKey.SavePkcs8EncryptedPemFile("myPassword","privKey_enc.pem")