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

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

loRsa = createobject("CkRsa")

// Generate a 2048-bit key.  Chilkat RSA supports
// key sizes ranging from 512 bits to 8192 bits.
llSuccess = loRsa.GenerateKey(2048)
if (llSuccess <> .T.) then
    ? loRsa.LastErrorText
    release loRsa
    return
endif

// Get the public and private key parts:
loPubKey = loRsa.ExportPublicKeyObj()
loPrivKey = loRsa.ExportPrivateKeyObj()

// Get the public key as a PKCS8 PEM string
lcPubKeyPem = loPubKey.GetPem(.F.)
? lcPubKeyPem

// Get the public key in PKCS8 format, in a Base64 encoded string.
lcPubKeyPkcs8Base64 = loPubKey.GetEncoded(.F.,"base64")
? lcPubKeyPkcs8Base64

// Get the public key in PKCS1 format, in a Base64 encoded string.
lcPubKeyPkcs1Base64 = loPubKey.GetEncoded(.T.,"base64")
? lcPubKeyPkcs1Base64

// Get the private key in a PKCS8 PEM string.
lcPrivKeyPem = loPrivKey.GetPkcs8Pem()
? lcPrivKeyPem

// Get the private key in a PKCS8 encrypted PEM string.
lcPrivKeyEncPem = loPrivKey.GetPkcs8EncryptedPem("myPassword")
? lcPrivKeyEncPem

// Get the private key in PKCS1 Base64 format
lcPrivKeyPkcs1Base64 = loPrivKey.GetPkcs1ENC("base64")
? lcPrivKeyPkcs1Base64

// Get the private key in PKCS8 Base64 format
lcPrivKeyPkcs8Base64 = loPrivKey.GetPkcs8ENC("base64")
? lcPrivKeyPkcs8Base64

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

// Save the public key to PKCS8 binary DER
llSuccess = loPubKey.SaveDerFile(.F.,"pubKey_pkcs8.der")

// Save the public key to PKCS1 binary DER
llSuccess = loPubKey.SaveDerFile("pubKey_pkcs1.der")

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

// Save the private key to unencrypted binary PKCS8
llSuccess = loPrivKey.SavePkcs8File("privKey_pkcs8.der")

// Save the private key to encrypted binary PKCS8
llSuccess = loPrivKey.SavePkcs8EncryptedFile("myPassword","privKey_enc_pkcs8.der")

// Save the private key to unencrypted PKCS8 PEM
llSuccess = loPrivKey.SavePkcs8PemFile("privKey.pem")

// Save the private key to encrypted PKCS8 PEM
llSuccess = loPrivKey.SavePkcs8EncryptedPemFile("myPassword","privKey_enc.pem")

release loPubKey
release loPrivKey


release loRsa