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(C) SII Chile - FRMT Signature Computation and Add to XMLCompute the FRMT signature and add to the XML. This is the RSA signature of the SHA-1 digest of the "flattened" DD element.
#include <C_CkXml.h> #include <C_CkStringBuilder.h> #include <C_CkPrivateKey.h> #include <C_CkRsa.h> void ChilkatSample(void) { HCkXml xml; BOOL success; HCkXml ddXml; HCkStringBuilder sbFlattened; HCkPrivateKey privKey; HCkRsa rsa; const char *sig; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // Also see: Compute the FRMA Signature and Add to XML xml = CkXml_Create(); // Load the unsigned XML that contains the following: // <DTE version="1.0"> // <Documento ID="F60T33"> // <TED version="1.0"> // <DD> // ... // <CAF version="1.0"> // <DA> // ... // </DA> // <FRMA algoritmo="SHA1withRSA">...</FRMA> // </CAF> // ... // </DD> // ... The FRMT will be added here in another example ... // </TED> // </Documento> // </DTE> success = CkXml_LoadXmlFile(xml,"qa_data/xml_dsig/sii_cl/test_1.xml"); if (success == FALSE) { printf("Failed to load initial XML file.\n"); CkXml_Dispose(xml); return; } // Get a reference to the "DD" element ddXml = CkXml_FindChild(xml,"Documento|TED|DD"); if (CkXml_getLastMethodSuccess(xml) == FALSE) { printf("Failed to find DD element\n"); CkXml_Dispose(xml); return; } // We need to get the "flattened" DD XML where: // - No whitespace between elements. // - The 5 pre-defined entities are converted. // - The text is encoded in the ISO-8859-1 character set (Latin-1), sbFlattened = CkStringBuilder_Create(); CkXml_putEmitCompact(ddXml,TRUE); CkXml_putEmitXmlDecl(ddXml,FALSE); CkXml_GetXmlSb(ddXml,sbFlattened); // Compute the SHA-1 message digest of the iso-8859-1 byte representation, // and sign it with our RSA private key, getting the result in base64 format. privKey = CkPrivateKey_Create(); success = CkPrivateKey_LoadAnyFormatFile(privKey,"qa_data/rsa/rsaPrivKey_pkcs8.pem",""); if (success == FALSE) { printf("%s\n",CkPrivateKey_lastErrorText(privKey)); CkXml_Dispose(xml); CkStringBuilder_Dispose(sbFlattened); CkPrivateKey_Dispose(privKey); return; } rsa = CkRsa_Create(); CkRsa_ImportPrivateKeyObj(rsa,privKey); CkRsa_putEncodingMode(rsa,"base64"); CkRsa_putCharset(rsa,"iso-8859-1"); sig = CkRsa_signStringENC(rsa,CkStringBuilder_getAsString(sbFlattened),"sha1"); // Add the FRMT signature element to the XML. CkXml_UpdateChildContent(xml,"Documento|TED|FRMT",sig); CkXml_UpdateAttrAt(xml,"Documento|TED|FRMT",TRUE,"algoritmo","SHA1withRSA"); CkXml_Dispose(ddXml); // See what we have: CkXml_putEmitCompact(xml,FALSE); CkXml_putEmitXmlDecl(xml,TRUE); printf("%s\n",CkXml_getXml(xml)); CkXml_Dispose(xml); CkStringBuilder_Dispose(sbFlattened); CkPrivateKey_Dispose(privKey); CkRsa_Dispose(rsa); } |
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