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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.)
#include <C_CkStringBuilderW.h> #include <C_CkCertW.h> #include <C_CkPublicKeyW.h> #include <C_CkXmlW.h> #include <C_CkBinDataW.h> void ChilkatSample(void) { HCkStringBuilderW sbCertBase64; BOOL success; HCkCertW cert; HCkPublicKeyW pubKey; int numBits; HCkXmlW xml; HCkBinDataW binDat; // For this example, I have a certificate in raw base64 format (not PEM), // that looks like this: "MIIGkDCCBHigAwIBAgIUMDA ... s/iqLsLA==" sbCertBase64 = CkStringBuilderW_Create(); success = CkStringBuilderW_LoadFile(sbCertBase64,L"qa_data/certs/base64Cert.txt",L"utf-8"); cert = CkCertW_Create(); success = CkCertW_LoadFromBase64(cert,CkStringBuilderW_getAsString(sbCertBase64)); if (success != TRUE) { wprintf(L"%s\n",CkCertW_lastErrorText(cert)); CkStringBuilderW_Dispose(sbCertBase64); CkCertW_Dispose(cert); return; } // Get the public key. pubKey = CkCertW_ExportPublicKey(cert); if (CkCertW_getLastMethodSuccess(cert) != TRUE) { wprintf(L"%s\n",CkCertW_lastErrorText(cert)); CkStringBuilderW_Dispose(sbCertBase64); CkCertW_Dispose(cert); return; } // In Chilkat version v9.5.0.67, the KeySize property was added. numBits = CkPublicKeyW_getKeySize(pubKey); wprintf(L"Number of bits = %d\n",numBits); // If using an older version of Chilkat, the key size can be obtained like this: xml = CkXmlW_Create(); CkXmlW_LoadXml(xml,CkPublicKeyW_getXml(pubKey)); binDat = CkBinDataW_Create(); CkBinDataW_AppendEncoded(binDat,CkXmlW_getChildContent(xml,L"Modulus"),L"base64"); numBits = 8 * CkBinDataW_getNumBytes(binDat); wprintf(L"Number of bits = %d\n",numBits); CkPublicKeyW_Dispose(pubKey); CkStringBuilderW_Dispose(sbCertBase64); CkCertW_Dispose(cert); CkXmlW_Dispose(xml); CkBinDataW_Dispose(binDat); } |
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