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(PowerBuilder) RSA-OAEP with SHA256 hashingRSA encrypt a SHA256 hash with OAEP padding. Note: This example requires Chilkat v11.0.0 or greater.
integer li_rc integer li_Success oleobject loo_Pubkey oleobject loo_SbPem integer li_BCrlf oleobject loo_Json oleobject loo_Rsa integer li_BUsePrivateKey string ls_EncryptedStr li_Success = 0 // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. loo_Pubkey = create oleobject li_rc = loo_Pubkey.ConnectToNewObject("Chilkat.PublicKey") if li_rc < 0 then destroy loo_Pubkey MessageBox("Error","Connecting to COM object failed") return end if loo_SbPem = create oleobject li_rc = loo_SbPem.ConnectToNewObject("Chilkat.StringBuilder") li_BCrlf = 1 loo_SbPem.AppendLine("-----BEGIN PUBLIC KEY-----",li_BCrlf) loo_SbPem.AppendLine("MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA33TqqLR3eeUmDtHS89qF",li_BCrlf) loo_SbPem.AppendLine("3p4MP7Wfqt2Zjj3lZjLjjCGDvwr9cJNlNDiuKboODgUiT4ZdPWbOiMAfDcDzlOxA",li_BCrlf) loo_SbPem.AppendLine("04DDnEFGAf+kDQiNSe2ZtqC7bnIc8+KSG/qOGQIVaay4Ucr6ovDkykO5Hxn7OU7s",li_BCrlf) loo_SbPem.AppendLine("Jp9TP9H0JH8zMQA6YzijYH9LsupTerrY3U6zyihVEDXXOv08vBHk50BMFJbE9iwF",li_BCrlf) loo_SbPem.AppendLine("wnxCsU5+UZUZYw87Uu0n4LPFS9BT8tUIvAfnRXIEWCha3KbFWmdZQZlyrFw0buUE",li_BCrlf) loo_SbPem.AppendLine("f0YN3/Q0auBkdbDR/ES2PbgKTJdkjc/rEeM0TxvOUf7HuUNOhrtAVEN1D5uuxE1W",li_BCrlf) loo_SbPem.AppendLine("SwIDAQAB",li_BCrlf) loo_SbPem.AppendLine("-----END PUBLIC KEY-----",li_BCrlf) // Load the public key object from the PEM. li_Success = loo_Pubkey.LoadFromString(loo_SbPem.GetAsString()) if li_Success = 0 then Write-Debug loo_Pubkey.LastErrorText destroy loo_Pubkey destroy loo_SbPem return end if // Build a small string to encrypt loo_Json = create oleobject li_rc = loo_Json.ConnectToNewObject("Chilkat.JsonObject") loo_Json.UpdateString("example","123") loo_Json.UpdateString("hello","world") Write-Debug loo_Json.Emit() // This is the JSON to be RSA encrypted: {"example":"123","hello":"world"} // IMPORTANT: RSA encryption is only used to encrypt small amounts of data. // RSA is only able to encrypt data to a maximum amount of your key size (2048 bits = 256 bytes) // minus padding / header data (11 bytes for PKCS#1 v1.5 padding, 42 bytes for OAEP). // As a result it is often not possible to encrypt files with RSA directly. // RSA is also not meant for this purpose. // // If you want to encrypt more data, you can use something like: // 1) Generate a 256-bit random keystring K // 2) Encrypt your data with AES-CBC with K // 3) Encrypt K with RSA // 4) Send both to the other side loo_Rsa = create oleobject li_rc = loo_Rsa.ConnectToNewObject("Chilkat.Rsa") loo_Rsa.PkcsPadding = 1 loo_Rsa.OaepHash = "SHA-256" loo_Rsa.UsePublicKey(loo_Pubkey) loo_Rsa.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. li_BUsePrivateKey = 0 ls_EncryptedStr = loo_Rsa.EncryptStringENC(loo_Json.Emit(),li_BUsePrivateKey) if loo_Rsa.LastMethodSuccess = 0 then Write-Debug loo_Rsa.LastErrorText destroy loo_Pubkey destroy loo_SbPem destroy loo_Json destroy loo_Rsa return end if Write-Debug "Result: " + ls_EncryptedStr destroy loo_Pubkey destroy loo_SbPem destroy loo_Json destroy loo_Rsa |
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