C
C
Verify a CAdES-BES Signature and Examine Signature Contents
See more Digital Signatures Examples
Demonstrates how to validate a .p7m (.p7s) signature and examine the contents of the signature.Chilkat C Downloads
#include <C_CkCrypt2.h>
#include <C_CkJsonObject.h>
#include <C_CkDtObj.h>
void ChilkatSample(void)
{
BOOL success;
HCkCrypt2 crypt;
const char *outputFile;
const char *inFile;
HCkJsonObject json;
HCkDtObj authAttrSigningTimeUtctime;
const char *issuerCN;
const char *serial;
const char *strVal;
const char *certSubjectKeyIdentifier;
const char *certDigestAlgOid;
const char *certDigestAlgName;
const char *signingAlgOid;
const char *signingAlgName;
const char *authAttrContentTypeName;
const char *authAttrContentTypeOid;
const char *authAttrSigningTimeName;
const char *authAttrMessageDigestName;
const char *authAttrMessageDigestDigest;
const char *authAttrSigningCertificateV2Name;
const char *authAttrSigningCertificateV2Der;
int i;
int count_i;
success = FALSE;
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
crypt = CkCrypt2_Create();
outputFile = "qa_output/original.xml";
inFile = "qa_data/p7m/fattura_signature.xml.p7m";
// Verify the signature and extract the contained file, which in this case is XML.
success = CkCrypt2_VerifyP7M(crypt,inFile,outputFile);
if (success == FALSE) {
printf("%s\n",CkCrypt2_lastErrorText(crypt));
CkCrypt2_Dispose(crypt);
return;
}
printf("Signature validated.\n");
// Now let's examine the information about the signature.
json = CkJsonObject_Create();
CkCrypt2_GetLastJsonData(crypt,json);
CkJsonObject_putEmitCompact(json,FALSE);
printf("%s\n",CkJsonObject_emit(json));
// Here's an example of the information about the signature:
// {
// "pkcs7": {
// "verify": {
// "certs": [
// {
// "issuerCN": "Xyz EU Qualified Certificates CA G1",
// "serial": "99A28A51AC389999"
// }
// ],
// "useConstructedOctets": true,
// "digestAlgorithms": [
// "sha256"
// ],
// "signerInfo": [
// {
// "cert": {
// "subjectKeyIdentifier": "5VM4x8AWnXf07yzbXuLtbb0U3yY=",
// "digestAlgOid": "2.16.840.1.101.3.4.2.1",
// "digestAlgName": "SHA256"
// },
// "signingAlgOid": "1.2.840.113549.1.1.11",
// "signingAlgName": "RSA-SHA256-PKCSV-1_5",
// "authAttr": {
// "1.2.840.113549.1.9.3": {
// "name": "contentType",
// "oid": "1.2.840.113549.1.7.1"
// },
// "1.2.840.113549.1.9.5": {
// "name": "signingTime",
// "utctime": "190901152340Z"
// },
// "1.2.840.113549.1.9.4": {
// "name": "messageDigest",
// "digest": "y+gd/zAQK33A//HInhaZba7w1fUJleV9AHbP1Ntx6U0="
// },
// "1.2.840.113549.1.9.16.2.47": {
// "name": "signingCertificateV2",
// "der": "MIH4MI..w4vv0="
// }
// }
// }
// ]
// }
// }
// }
// Use this online tool to generate parsing code from sample JSON:
// Generate Parsing Code from JSON
// Chilkat functions returning "const char *" return a pointer to temporary internal memory owned and managed by Chilkat.
// See this example explaining how this memory should be used: const char * functions.
authAttrSigningTimeUtctime = CkDtObj_Create();
i = 0;
count_i = CkJsonObject_SizeOfArray(json,"pkcs7.verify.certs");
while (i < count_i) {
CkJsonObject_putI(json,i);
issuerCN = CkJsonObject_stringOf(json,"pkcs7.verify.certs[i].issuerCN");
serial = CkJsonObject_stringOf(json,"pkcs7.verify.certs[i].serial");
i = i + 1;
}
i = 0;
count_i = CkJsonObject_SizeOfArray(json,"pkcs7.verify.digestAlgorithms");
while (i < count_i) {
CkJsonObject_putI(json,i);
strVal = CkJsonObject_stringOf(json,"pkcs7.verify.digestAlgorithms[i]");
i = i + 1;
}
i = 0;
count_i = CkJsonObject_SizeOfArray(json,"pkcs7.verify.signerInfo");
while (i < count_i) {
CkJsonObject_putI(json,i);
certSubjectKeyIdentifier = CkJsonObject_stringOf(json,"pkcs7.verify.signerInfo[i].cert.subjectKeyIdentifier");
certDigestAlgOid = CkJsonObject_stringOf(json,"pkcs7.verify.signerInfo[i].cert.digestAlgOid");
certDigestAlgName = CkJsonObject_stringOf(json,"pkcs7.verify.signerInfo[i].cert.digestAlgName");
signingAlgOid = CkJsonObject_stringOf(json,"pkcs7.verify.signerInfo[i].signingAlgOid");
signingAlgName = CkJsonObject_stringOf(json,"pkcs7.verify.signerInfo[i].signingAlgName");
authAttrContentTypeName = CkJsonObject_stringOf(json,"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".name");
authAttrContentTypeOid = CkJsonObject_stringOf(json,"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".oid");
authAttrSigningTimeName = CkJsonObject_stringOf(json,"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".name");
CkJsonObject_DtOf(json,"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".utctime",FALSE,authAttrSigningTimeUtctime);
authAttrMessageDigestName = CkJsonObject_stringOf(json,"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".name");
authAttrMessageDigestDigest = CkJsonObject_stringOf(json,"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".digest");
authAttrSigningCertificateV2Name = CkJsonObject_stringOf(json,"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.16.2.47\".name");
authAttrSigningCertificateV2Der = CkJsonObject_stringOf(json,"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.16.2.47\".der");
i = i + 1;
}
CkCrypt2_Dispose(crypt);
CkJsonObject_Dispose(json);
CkDtObj_Dispose(authAttrSigningTimeUtctime);
}