(C) FatturaPA XML Invoice Sign+Encrypt to P7M

Demonstrates how to create a CAdES BES signed + encrypted invoice.xml.p7m for the Italian FatturaPA exchange system.

Note: This example requires Chilkat v9.5.0.75 or greater.

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#include <C_CkCrypt2.h>
#include <C_CkCert.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    HCkCrypt2 crypt;
    const char *pfxPath;
    const char *pfxPassword;
    HCkCert cert;
    BOOL success;
    HCkJsonObject jsonSignedAttrs;
    const char *inFile;
    const char *sigFile;
    HCkCert encryptCert;

    // Note: Requires Chilkat v9.5.0.75 or greater.

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

    crypt = CkCrypt2_Create();

    // Use a digital certificate and private key from a PFX file (.pfx or .p12).
    pfxPath = "qa_data/pfx/cert_test123.pfx";
    pfxPassword = "test123";

    cert = CkCert_Create();
    success = CkCert_LoadPfxFile(cert,pfxPath,pfxPassword);
    if (success != TRUE) {
        printf("%s\n",CkCert_lastErrorText(cert));
        CkCrypt2_Dispose(crypt);
        CkCert_Dispose(cert);
        return;
    }

    // Provide the signing cert (with associated private key).
    success = CkCrypt2_SetSigningCert(crypt,cert);
    if (success != TRUE) {
        printf("%s\n",CkCrypt2_lastErrorText(crypt));
        CkCrypt2_Dispose(crypt);
        CkCert_Dispose(cert);
        return;
    }

    // Indicate that SHA-256 should be used.
    CkCrypt2_putHashAlgorithm(crypt,"sha256");

    // Specify the signed attributes to be included.
    // (This is what makes it CAdES-BES compliant.)
    jsonSignedAttrs = CkJsonObject_Create();
    CkJsonObject_UpdateInt(jsonSignedAttrs,"contentType",1);
    CkJsonObject_UpdateInt(jsonSignedAttrs,"signingTime",1);
    CkJsonObject_UpdateInt(jsonSignedAttrs,"messageDigest",1);
    CkJsonObject_UpdateInt(jsonSignedAttrs,"signingCertificateV2",1);
    CkCrypt2_putSigningAttributes(crypt,CkJsonObject_emit(jsonSignedAttrs));

    inFile = "qa_data/xml/IT01234567890_11002.xml";
    sigFile = "qa_data/fatturapa/signed.p7m";

    // Create the CAdES-BES signature, which contains the original data.
    success = CkCrypt2_CreateP7M(crypt,inFile,sigFile);
    if (success == FALSE) {
        printf("%s\n",CkCrypt2_lastErrorText(crypt));
        CkCrypt2_Dispose(crypt);
        CkCert_Dispose(cert);
        CkJsonObject_Dispose(jsonSignedAttrs);
        return;
    }

    // Now we'll encrypt what was signed using FatturaPA's certificate (from a PEM file)
    encryptCert = CkCert_Create();
    success = CkCert_LoadFromFile(encryptCert,"qa_data/certs/fatturapa_cert.pem");
    if (success != TRUE) {
        printf("%s\n",CkCert_lastErrorText(encryptCert));
        CkCrypt2_Dispose(crypt);
        CkCert_Dispose(cert);
        CkJsonObject_Dispose(jsonSignedAttrs);
        CkCert_Dispose(encryptCert);
        return;
    }

    CkCrypt2_putCryptAlgorithm(crypt,"pki");

    success = CkCrypt2_SetEncryptCert(crypt,encryptCert);
    if (success != TRUE) {
        printf("%s\n",CkCrypt2_lastErrorText(crypt));
        CkCrypt2_Dispose(crypt);
        CkCert_Dispose(cert);
        CkJsonObject_Dispose(jsonSignedAttrs);
        CkCert_Dispose(encryptCert);
        return;
    }

    // Indicate the underlying bulk encryption algorithm to be used:
    CkCrypt2_putPkcs7CryptAlg(crypt,"aes");
    CkCrypt2_putKeyLength(crypt,128);

    // There's one last option that could be set.  If is the RSA encryption encryption/padding scheme. 
    // By default, RSAES_PKCS1-V1_5 is used.  If desired, the OaepPadding property could be set to TRUE to
    // use RSAES_OAEP.  (We'll leave it set at the default value of FALSE)
    CkCrypt2_putOaepPadding(crypt,FALSE);

    // Everything is specified.  Encrypt the .p7m to create a new .p7m (which adds a layer of encryption around the opaque signature).
    // The output is PKCS7 in binary DER format.
    success = CkCrypt2_CkEncryptFile(crypt,sigFile,"qa_output/signed_and_encrypted.p7m");
    if (success != TRUE) {
        printf("%s\n",CkCrypt2_lastErrorText(crypt));
        CkCrypt2_Dispose(crypt);
        CkCert_Dispose(cert);
        CkJsonObject_Dispose(jsonSignedAttrs);
        CkCert_Dispose(encryptCert);
        return;
    }

    printf("Success.\n");


    CkCrypt2_Dispose(crypt);
    CkCert_Dispose(cert);
    CkJsonObject_Dispose(jsonSignedAttrs);
    CkCert_Dispose(encryptCert);

    }