C

RSA Sign utf-8 Byte Representation of String

See more RSA Examples

Demontstrates how to sign the utf-8 byte representation of a string. C

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

void ChilkatSample(void)
    {
    BOOL success;
    HCkPrivateKey privKey;
    HCkRsa rsa;
    const char *originalData;
    const char *sigBase64;

    success = FALSE;

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

    // Load an RSA private key for signing.
    privKey = CkPrivateKey_Create();
    success = CkPrivateKey_LoadEncryptedPemFile(privKey,"qa_data/pem/rsa_passwd.pem","passwd");
    if (success == FALSE) {
        printf("%s\n",CkPrivateKey_lastErrorText(privKey));
        CkPrivateKey_Dispose(privKey);
        return;
    }

    rsa = CkRsa_Create();
    success = CkRsa_UsePrivateKey(rsa,privKey);
    if (success == FALSE) {
        printf("%s\n",CkRsa_lastErrorText(rsa));
        CkPrivateKey_Dispose(privKey);
        CkRsa_Dispose(rsa);
        return;
    }

    originalData = "This is the string to be hashed an RSA signed.";

    // Indicate that we want the utf-8 byte representation of the string to be signed
    CkRsa_putCharset(rsa,"utf-8");

    // We want the RSA signature in base64 format
    CkRsa_putEncodingMode(rsa,"base64");

    sigBase64 = CkRsa_signStringENC(rsa,originalData,"sha256");
    printf("%s\n",sigBase64);


    CkPrivateKey_Dispose(privKey);
    CkRsa_Dispose(rsa);

    }