(PureBasic) RSA Sign using Base64 Private Key

Signs a string using a non-encrypted RSA private key in base64 encoding. Returns the RSA signature as a base64 string.

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkStringBuilder.pb"
IncludeFile "CkPrivateKey.pb"
IncludeFile "CkRsa.pb"

Procedure ChilkatExample()

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

    privKey.i = CkPrivateKey::ckCreate()
    If privKey.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success.i

    sbPem.i = CkStringBuilder::ckCreate()
    If sbPem.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkStringBuilder::ckAppendLine(sbPem,"-----BEGIN RSA PRIVATE KEY-----",1)
    CkStringBuilder::ckAppendLine(sbPem,"MIIC .... j5A==",1)
    CkStringBuilder::ckAppendLine(sbPem,"-----END RSA PRIVATE KEY-----",1)

    success = CkPrivateKey::ckLoadPem(privKey,CkStringBuilder::ckGetAsString(sbPem))
    If success <> 1
        Debug CkPrivateKey::ckLastErrorText(privKey)
        CkPrivateKey::ckDispose(privKey)
        CkStringBuilder::ckDispose(sbPem)
        ProcedureReturn
    EndIf

    rsa.i = CkRsa::ckCreate()
    If rsa.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkRsa::ckImportPrivateKeyObj(rsa,privKey)
    If success <> 1
        Debug CkRsa::ckLastErrorText(rsa)
        CkPrivateKey::ckDispose(privKey)
        CkStringBuilder::ckDispose(sbPem)
        CkRsa::ckDispose(rsa)
        ProcedureReturn
    EndIf

    CkRsa::setCkEncodingMode(rsa, "base64")
    strSigned.s = CkRsa::ckOpenSslSignStringENC(rsa,"12345678")
    Debug strSigned

    strOriginal.s = CkRsa::ckOpenSslVerifyStringENC(rsa,strSigned)
    Debug strOriginal


    CkPrivateKey::ckDispose(privKey)
    CkStringBuilder::ckDispose(sbPem)
    CkRsa::ckDispose(rsa)


    ProcedureReturn
EndProcedure