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(C) RSA OAEP PaddingDemonstrates how to use OAEP padding with the RSA encryption algorithm. More information about OAEP Padding. Note: This example requires Chilkat v11.0.0 or greater.
#include <C_CkRsa.h> #include <C_CkPublicKey.h> void ChilkatSample(void) { BOOL success; HCkRsa rsa; const char *pubKeyXml; HCkPublicKey pubKey; const char *plainText; BOOL usePrivateKey; const char *encryptedStr; success = FALSE; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. rsa = CkRsa_Create(); // RSA public key in XML format: pubKeyXml = "<RSAPublicKey><Modulus>of3im3mRgd2NLXIGoK6uYLg6jj0Ug2b42rnqa5Tbwz2ieFqMJqt+++x2oqLYGurlz49nt+7/785g3XYWqoka4u9c9zul6YubIjnBM72dQy7rEkEfbUxgjcxqXyjZFx+FpaxFUecLu688XEu+9UA42VKiCgcl+E7TrqnfeeYpNXc=</Modulus><Exponent>AQAB</Exponent></RSAPublicKey>"; pubKey = CkPublicKey_Create(); success = CkPublicKey_LoadFromString(pubKey,pubKeyXml); if (success == FALSE) { printf("%s\n",CkPublicKey_lastErrorText(pubKey)); CkRsa_Dispose(rsa); CkPublicKey_Dispose(pubKey); return; } success = CkRsa_UsePublicKey(rsa,pubKey); if (success == FALSE) { printf("%s\n",CkRsa_lastErrorText(rsa)); CkRsa_Dispose(rsa); CkPublicKey_Dispose(pubKey); return; } // To use Optimal Asymmetric Encryption Padding (OAEP) padding, // simply set the PkcsPadding property to FALSE CkRsa_putPkcsPadding(rsa,FALSE); // Encrypt a string and return the encrypted data base64-encoded: CkRsa_putEncodingMode(rsa,"base64"); plainText = "RSA Encryption should be easy."; usePrivateKey = FALSE; encryptedStr = CkRsa_encryptStringENC(rsa,plainText,usePrivateKey); printf("%s\n",encryptedStr); CkRsa_Dispose(rsa); CkPublicKey_Dispose(pubKey); } |
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