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(Unicode C) RSA Encrypt RSA/ECB/OAEPWithSHA1AndMGF1PaddingDemonstrates how to RSA encrypt using RSA/ECB/OAEPWithSHA1AndMGF1Padding. Also demonstrates RSA/ECB/OAEPWithSHA-256AndMGF1Padding. Both of these terms are from Java's JCE. Note: In this context, "ECB" doesn't actually mean anything. It's a symmetric cipher mode that doesn't apply (or make sense) in this context.
#include <C_CkRsaW.h> #include <C_CkPublicKeyW.h> #include <C_CkPrivateKeyW.h> void ChilkatSample(void) { HCkRsaW rsa; HCkPublicKeyW pubkey; BOOL success; const wchar_t *plainText; BOOL usePrivateKey; const wchar_t *encryptedStr; HCkRsaW rsa2; HCkPrivateKeyW privKey; const wchar_t *originalStr; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. rsa = CkRsaW_Create(); // First load a public key object with a public key. // In this case, we'll load it from a file. pubkey = CkPublicKeyW_Create(); success = CkPublicKeyW_LoadFromFile(pubkey,L"qa_data/pem/rsa_public.pem"); if (success != TRUE) { wprintf(L"%s\n",CkPublicKeyW_lastErrorText(pubkey)); CkRsaW_Dispose(rsa); CkPublicKeyW_Dispose(pubkey); return; } // RSA encryption is limited to small amounts of data. The limit // is typically a few hundred bytes and is based on the key size and // padding (OAEP vs. PKCS1_5). RSA encryption is typically used for // encrypting hashes or symmetric (bulk encryption algorithm) secret keys. plainText = L"Time is an illusion. Lunchtime doubly so."; // Import the public key to be used for encrypting. success = CkRsaW_ImportPublicKeyObj(rsa,pubkey); // To get OAEP padding, set the OaepPadding property: CkRsaW_putOaepPadding(rsa,TRUE); // To use SHA1 or SHA-256, set the OaepHash property CkRsaW_putOaepHash(rsa,L"sha256"); // for SHA1 -- CkRsaW_putOaepHash(rsa,L"sha1"); // Indicate we'll want hex output CkRsaW_putEncodingMode(rsa,L"hex"); // Encrypt.. usePrivateKey = FALSE; encryptedStr = CkRsaW_encryptStringENC(rsa,plainText,usePrivateKey); wprintf(L"%s\n",encryptedStr); // ------------------------------------------------- // Now decrypt with the matching private key. rsa2 = CkRsaW_Create(); privKey = CkPrivateKeyW_Create(); success = CkPrivateKeyW_LoadEncryptedPem(privKey,L"qa_data/pem/rsa_passwd.pem",L"passwd"); if (success != TRUE) { wprintf(L"%s\n",CkPrivateKeyW_lastErrorText(privKey)); CkRsaW_Dispose(rsa); CkPublicKeyW_Dispose(pubkey); CkRsaW_Dispose(rsa2); CkPrivateKeyW_Dispose(privKey); return; } success = CkRsaW_ImportPrivateKeyObj(rsa2,privKey); // Make sure we have the same settings used for encryption. CkRsaW_putOaepPadding(rsa2,TRUE); CkRsaW_putEncodingMode(rsa2,L"hex"); CkRsaW_putOaepHash(rsa2,L"sha1"); originalStr = CkRsaW_decryptStringENC(rsa2,encryptedStr,TRUE); wprintf(L"%s\n",originalStr); CkRsaW_Dispose(rsa); CkPublicKeyW_Dispose(pubkey); CkRsaW_Dispose(rsa2); CkPrivateKeyW_Dispose(privKey); } |
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