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(Unicode C) Verify a .p7m and get Algorithm InformationDemonstrates how to verify a .p7m and then examine the algorithms used by the signature.
#include <C_CkCrypt2W.h> #include <C_CkJsonObjectW.h> void ChilkatSample(void) { HCkCrypt2W crypt; const wchar_t *inFile; const wchar_t *outFile; BOOL success; HCkJsonObjectW json; int i; int count_i; const wchar_t *strVal; const wchar_t *certSerialNumber; const wchar_t *certIssuerCN; const wchar_t *certIssuerDN; const wchar_t *certDigestAlgOid; const wchar_t *certDigestAlgName; const wchar_t *contentType; const wchar_t *signingTime; const wchar_t *messageDigest; const wchar_t *signingAlgOid; const wchar_t *signerDigest; int j; int count_j; const wchar_t *oid; const wchar_t *oidName; const wchar_t *der; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. crypt = CkCrypt2W_Create(); inFile = L"qa_data/p7m/brainpoolP256r1.p7m"; outFile = L"qa_output/something.dat"; // Verify and extract the signed data. success = CkCrypt2W_VerifyP7M(crypt,inFile,outFile); if (success == FALSE) { wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt)); CkCrypt2W_Dispose(crypt); return; } // Examine details about the signature(s) json = CkCrypt2W_LastJsonData(crypt); CkJsonObjectW_putEmitCompact(json,FALSE); wprintf(L"%s\n",CkJsonObjectW_emit(json)); // Sample output // { // "pkcs7": { // "verify": { // "digestAlgorithms": [ // "sha256" // ], // "signerInfo": [ // { // "cert": { // "serialNumber": "FFFFE552B302FFFFFF1E34C3ACEB2FFFF", // "issuerCN": "The common name of the cert...", // "issuerDN": "", // "digestAlgOid": "2.16.840.1.101.3.4.2.1", // "digestAlgName": "SHA256" // }, // "contentType": "1.2.840.113549.1.7.1", // "signingTime": "190409140500Z", // "messageDigest": "lQe9If7vZKFf/NlSYu5Esmlw3phVK/RFsbbb1uH73t8=", // "signingAlgOid": "1.2.840.10045.4.3.2", // "signerDigest": "lQe9If7vZKFf/NlSYu5Esmlw3phVK/RFsbbb1uH73t8=", // "authAttr": [ // { // "oid": "1.2.840.113549.1.9.3", // "oidName": "contentType" // }, // { // "oid": "1.2.840.113549.1.9.5", // "oidName": "signingTime" // }, // { // "oid": "1.2.840.113549.1.9.52", // "oidName": "1.2.840.113549.1.9.52", // "der": "MBs ... AwI=" // }, // { // "oid": "1.2.840.113549.1.9.4", // "oidName": "messageDigest" // }, // { // "oid": "1.2.840.113549.1.9.16.2.47", // "oidName": "signingCertificateV2", // "der": "MCYw .. 7PlQ==" // }, // { // "oid": "1.2.840.113549.1.9.20", // "oidName": "1.2.840.113549.1.9.20" // } // ] // } // ] // } // } // } // Code for parsing the above JSON... i = 0; count_i = CkJsonObjectW_SizeOfArray(json,L"pkcs7.verify.digestAlgorithms"); while (i < count_i) { CkJsonObjectW_putI(json,i); strVal = CkJsonObjectW_stringOf(json,L"pkcs7.verify.digestAlgorithms[i]"); i = i + 1; } i = 0; count_i = CkJsonObjectW_SizeOfArray(json,L"pkcs7.verify.signerInfo"); while (i < count_i) { CkJsonObjectW_putI(json,i); certSerialNumber = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].cert.serialNumber"); certIssuerCN = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].cert.issuerCN"); certIssuerDN = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].cert.issuerDN"); certDigestAlgOid = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].cert.digestAlgOid"); certDigestAlgName = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].cert.digestAlgName"); contentType = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].contentType"); signingTime = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].signingTime"); messageDigest = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].messageDigest"); signingAlgOid = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].signingAlgOid"); signerDigest = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].signerDigest"); j = 0; count_j = CkJsonObjectW_SizeOfArray(json,L"pkcs7.verify.signerInfo[i].authAttr"); while (j < count_j) { CkJsonObjectW_putJ(json,j); oid = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].authAttr[j].oid"); oidName = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].authAttr[j].oidName"); der = CkJsonObjectW_stringOf(json,L"pkcs7.verify.signerInfo[i].authAttr[j].der"); j = j + 1; } i = i + 1; } CkJsonObjectW_Dispose(json); wprintf(L"Success!\n"); CkCrypt2W_Dispose(crypt); } |
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