(C) RSA Sign using Base64 Private Key

Signs a string using a non-encrypted RSA private key in base64 encoding. Returns the RSA signature as a base64 string.

Chilkat C/C++ Library Downloads
MS Visual C/C++ Linux/CentOS C/C++ Alpine Linux C/C++ MAC OS X C/C++	armhf/aarch64 C/C++ C++ Builder iOS C/C++ Android C/C++	Solaris C/C++ MinGW C/C++

#include <C_CkPrivateKey.h>
#include <C_CkStringBuilder.h>
#include <C_CkRsa.h>

void ChilkatSample(void)
    {
    HCkPrivateKey privKey;
    BOOL success;
    HCkStringBuilder sbPem;
    HCkRsa rsa;
    const char *strSigned;
    const char *strOriginal;

    //  This requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    privKey = CkPrivateKey_Create();

    sbPem = CkStringBuilder_Create();
    CkStringBuilder_AppendLine(sbPem,"-----BEGIN RSA PRIVATE KEY-----",TRUE);
    CkStringBuilder_AppendLine(sbPem,"MIIC .... j5A==",TRUE);
    CkStringBuilder_AppendLine(sbPem,"-----END RSA PRIVATE KEY-----",TRUE);

    success = CkPrivateKey_LoadPem(privKey,CkStringBuilder_getAsString(sbPem));
    if (success != TRUE) {
        printf("%s\n",CkPrivateKey_lastErrorText(privKey));
        CkPrivateKey_Dispose(privKey);
        CkStringBuilder_Dispose(sbPem);
        return;
    }

    rsa = CkRsa_Create();

    success = CkRsa_ImportPrivateKeyObj(rsa,privKey);
    if (success != TRUE) {
        printf("%s\n",CkRsa_lastErrorText(rsa));
        CkPrivateKey_Dispose(privKey);
        CkStringBuilder_Dispose(sbPem);
        CkRsa_Dispose(rsa);
        return;
    }

    CkRsa_putEncodingMode(rsa,"base64");
    strSigned = CkRsa_openSslSignStringENC(rsa,"12345678");
    printf("%s\n",strSigned);

    strOriginal = CkRsa_openSslVerifyStringENC(rsa,strSigned);
    printf("%s\n",strOriginal);


    CkPrivateKey_Dispose(privKey);
    CkStringBuilder_Dispose(sbPem);
    CkRsa_Dispose(rsa);

    }