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(C) RSA Signature/Verify with .key and .cerSee more RSA ExamplesDemonstrates how to use a .key file (private key) and digital certificate (.cer, public key) to create and verify an RSA signature.Note: This example requires Chilkat v11.0.0 or greater.
#include <C_CkPrivateKey.h> #include <C_CkRsa.h> #include <C_CkCert.h> #include <C_CkPublicKey.h> void ChilkatSample(void) { BOOL success; HCkPrivateKey privKey; HCkRsa rsa; const char *strData; const char *hexSig; HCkCert cert; HCkPublicKey pubKey; HCkRsa rsa2; success = FALSE; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. privKey = CkPrivateKey_Create(); // Load the private key from an RSA .key file: success = CkPrivateKey_LoadPemFile(privKey,"privateKey.key"); if (success == FALSE) { printf("%s\n",CkPrivateKey_lastErrorText(privKey)); CkPrivateKey_Dispose(privKey); return; } rsa = CkRsa_Create(); // Import the private key into the RSA component: success = CkRsa_UsePrivateKey(rsa,privKey); if (success == FALSE) { printf("%s\n",CkRsa_lastErrorText(rsa)); CkPrivateKey_Dispose(privKey); CkRsa_Dispose(rsa); return; } // Create the signature as a hex string: CkRsa_putEncodingMode(rsa,"hex"); strData = "This is the string to be signed."; // Sign the string using the sha256 hash algorithm. // Other valid choices are "md2", "sha1", "sha384", // "sha512", and "md5". hexSig = CkRsa_signStringENC(rsa,strData,"sha256"); printf("%s\n",hexSig); // Load a digital certificate from a .cer file: cert = CkCert_Create(); success = CkCert_LoadFromFile(cert,"myCert.cer"); if (success == FALSE) { printf("%s\n",CkCert_lastErrorText(cert)); CkPrivateKey_Dispose(privKey); CkRsa_Dispose(rsa); CkCert_Dispose(cert); return; } pubKey = CkPublicKey_Create(); CkCert_GetPublicKey(cert,pubKey); // Now verify using a new instance of the RSA object: rsa2 = CkRsa_Create(); // Import the public key into the RSA object: success = CkRsa_UsePublicKey(rsa2,pubKey); if (success == FALSE) { printf("%s\n",CkRsa_lastErrorText(rsa2)); CkPrivateKey_Dispose(privKey); CkRsa_Dispose(rsa); CkCert_Dispose(cert); CkPublicKey_Dispose(pubKey); CkRsa_Dispose(rsa2); return; } // The signature is a hex string, so make sure the EncodingMode is correct: CkRsa_putEncodingMode(rsa2,"hex"); // Verify the signature: success = CkRsa_VerifyStringENC(rsa2,strData,"sha256",hexSig); if (success == FALSE) { printf("%s\n",CkRsa_lastErrorText(rsa2)); CkPrivateKey_Dispose(privKey); CkRsa_Dispose(rsa); CkCert_Dispose(cert); CkPublicKey_Dispose(pubKey); CkRsa_Dispose(rsa2); return; } printf("Success.\n"); CkPrivateKey_Dispose(privKey); CkRsa_Dispose(rsa); CkCert_Dispose(cert); CkPublicKey_Dispose(pubKey); CkRsa_Dispose(rsa2); } |
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