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(Unicode C) Duplicate PHP's openssl_encrypt and openssl_random_pseudo_bytesDemonstrates how to duplicate PHP's openssl_encrypt function. (https://www.php.net/manual/en/function.openssl-encrypt.php) For more information, see https://www.php.net/manual/en/function.openssl-encrypt.php
#include <C_CkCrypt2W.h> #include <C_CkBinDataW.h> void ChilkatSample(void) { BOOL success; HCkCrypt2W crypt; const wchar_t *text; const wchar_t *passphrase; const wchar_t *ivBase64; HCkBinDataW bdKey; int sz; const wchar_t *cipherText64; HCkBinDataW bd; const wchar_t *result; HCkBinDataW bdResult; const wchar_t *originalText; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // Duplicates thw following PHP script: // $text = "This is a test"; // $passphrase = "my password"; // $iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length("AES-256-CBC")); // $crypted = base64_encode($iv.openssl_encrypt($text, "AES-256-CBC", $passphrase, OPENSSL_RAW_DATA, $iv)); // echo $crypted; crypt = CkCrypt2W_Create(); text = L"This is a test"; passphrase = L"my password"; // AES is a block cipher. The IV size for any block cipher is the size of the block, which is defined by the encryption algorithm. // For AES, the block size is always 16 bytes, regardless of key size (i.e. 128-bits, 192-bits, or 256-bits). // Therefore, generate 16 random bytes for the IV. CkCrypt2W_putEncodingMode(crypt,L"base64"); ivBase64 = CkCrypt2W_genRandomBytesENC(crypt,16); wprintf(L"Generated IV = %s\n",ivBase64); // Because we're doing AES-256-CBC, the key length must be 256-bits (i.e. 32 bytes). // Given that our passphrase is a us-ascii string that can be shorter or longer than 32-bytes, we need to // somehow transform the passphrase to a 32-byte secret key. We need to know what openssl_encrypt does. // Here's the answer from the openssl_encrypt documentation: // // "If the passphrase is shorter than expected, it is silently padded with NUL characters; // if the passphrase is longer than expected, it is silently truncated." // OK.... so let's pad or shorten to get a 32-byte key. bdKey = CkBinDataW_Create(); CkBinDataW_AppendString(bdKey,passphrase,L"utf-8"); sz = CkBinDataW_getNumBytes(bdKey); if (sz > 32) { CkBinDataW_RemoveChunk(bdKey,32,sz - 32); } else { CkBinDataW_Clear(bdKey); CkBinDataW_AppendPadded(bdKey,passphrase,L"utf-8",FALSE,32); } // Setup for encryption. CkCrypt2W_putCryptAlgorithm(crypt,L"aes"); CkCrypt2W_putKeyLength(crypt,256); CkCrypt2W_SetEncodedIV(crypt,ivBase64,L"base64"); CkCrypt2W_SetEncodedKey(crypt,CkBinDataW_getEncoded(bdKey,L"base64"),L"base64"); // Encrypt and base64 encode. cipherText64 = CkCrypt2W_encryptStringENC(crypt,text); // The PHP code fragment above returns the base64 encoded bytes of the IV and the encrypted text. // So let's do that.. bd = CkBinDataW_Create(); CkBinDataW_AppendEncoded(bd,ivBase64,L"base64"); CkBinDataW_AppendEncoded(bd,cipherText64,L"base64"); result = CkBinDataW_getEncoded(bd,L"base64"); wprintf(L"result = %s\n",result); // Sample output: // dN0vS1O0cWi5BbLAAY+NTf7bs3S27xzPf11RkG47sjs= // Now let's decrypt from the output... // Setup for decryption. CkCrypt2W_putCryptAlgorithm(crypt,L"aes"); CkCrypt2W_putKeyLength(crypt,256); CkCrypt2W_SetEncodedKey(crypt,CkBinDataW_getEncoded(bdKey,L"base64"),L"base64"); bdResult = CkBinDataW_Create(); CkBinDataW_AppendEncoded(bdResult,result,L"base64"); CkCrypt2W_SetEncodedIV(crypt,CkBinDataW_getEncodedChunk(bdResult,0,16,L"base64"),L"base64"); // Remove the IV (first 16 bytes) from the result. CkBinDataW_RemoveChunk(bdResult,0,16); success = CkCrypt2W_DecryptBd(crypt,bdResult); originalText = CkBinDataW_getString(bdResult,L"utf-8"); wprintf(L"original text = %s\n",originalText); CkCrypt2W_Dispose(crypt); CkBinDataW_Dispose(bdKey); CkBinDataW_Dispose(bd); CkBinDataW_Dispose(bdResult); } |
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