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(C) RSA Sign with PKCS8 Encrypted Key

Demonstrates how to load a private key from an encrypted PKCS8 file and create an RSA digital signature.

Chilkat C/C++ Library Downloads

MS Visual C/C++

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

void ChilkatSample(void)
    {
    HCkPrivateKey pkey;
    BOOL success;
    const char *pkeyXml;
    HCkRsa rsa;
    const char *strData;
    const char *hexSig;

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

    pkey = CkPrivateKey_Create();

    // Load the private key from an RSA PEM file:
    success = CkPrivateKey_LoadPkcs8EncryptedFile(pkey,"privateKey.key","myPassword");

    // Get the private key in XML format:
    pkeyXml = CkPrivateKey_getXml(pkey);

    rsa = CkRsa_Create();

    // Import the private key into the RSA component:
    success = CkRsa_ImportPrivateKey(rsa,pkeyXml);
    if (success != TRUE) {
        printf("%s\n",CkRsa_lastErrorText(rsa));
        CkPrivateKey_Dispose(pkey);
        CkRsa_Dispose(rsa);
        return;
    }

    // This example will sign a string, and receive the signature
    // in a hex-encoded string.  Therefore, set the encoding mode
    // to "hex":
    CkRsa_putEncodingMode(rsa,"hex");

    // If some other non-Chilkat application or web service is going to be verifying
    // the signature, it is important to match the byte-ordering.
    // The LittleEndian property may be set to TRUE
    // for little-endian byte ordering, 
    // or FALSE  for big-endian byte ordering.
    // Microsoft apps typically use little-endian, while
    // OpenSSL and other services (such as Amazon CloudFront)
    // use big-endian.
    CkRsa_putLittleEndian(rsa,FALSE);

    strData = "This is the string to be signed.";

    // Sign the string using the sha-1 hash algorithm.
    // Other valid choices are "md2", "sha256", "sha384", "sha512",  and "md5".
    hexSig = CkRsa_signStringENC(rsa,strData,"sha-1");

    printf("%s\n",hexSig);


    CkPrivateKey_Dispose(pkey);
    CkRsa_Dispose(rsa);

    }

 

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