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(Unicode C++) Get a Certificate's Key SizeDemonstrates how to get the RSA key size of a certificate (for example, 1024-bit, 2048-bit, etc.) Note: This example requires Chilkat v11.0.0 or greater.
#include <CkStringBuilderW.h> #include <CkCertW.h> #include <CkPublicKeyW.h> #include <CkXmlW.h> #include <CkBinDataW.h> void ChilkatSample(void) { bool success = false; // For this example, I have a certificate in raw base64 format (not PEM), // that looks like this: "MIIGkDCCBHigAwIBAgIUMDA ... s/iqLsLA==" CkStringBuilderW sbCertBase64; success = sbCertBase64.LoadFile(L"qa_data/certs/base64Cert.txt",L"utf-8"); CkCertW cert; success = cert.LoadFromBase64(sbCertBase64.getAsString()); if (success == false) { wprintf(L"%s\n",cert.lastErrorText()); return; } // Get the public key. CkPublicKeyW pubKey; cert.GetPublicKey(pubKey); int numBits = pubKey.get_KeySize(); wprintf(L"Number of bits = %d\n",numBits); // If using an older version of Chilkat, the key size can be obtained like this: CkXmlW xml; xml.LoadXml(pubKey.getXml()); CkBinDataW binDat; binDat.AppendEncoded(xml.getChildContent(L"Modulus"),L"base64"); numBits = 8 * binDat.get_NumBytes(); wprintf(L"Number of bits = %d\n",numBits); } |
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