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(Unicode C) openssl enc decryptDemonstrates how to decrypt a file that was encrypted using "openssl enc". This example shows how to decrypt what was created using this openssl command: openssl enc -e -aes-256-cbc -in hamlet.xml -out hamlet.enc -pass file:./secret.txt This example shows how to do this: openssl enc -d -aes-256-cbc -in hamlet.enc -out hamlet_dec.xml -pass file:./secret.txt Note: This example requires Chilkat v9.5.0.71 or later.
#include <C_CkCrypt2W.h> #include <C_CkBinDataW.h> void ChilkatSample(void) { HCkCrypt2W crypt; HCkBinDataW fileData; BOOL success; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. crypt = CkCrypt2W_Create(); // Use aes-256-cbc CkCrypt2W_putCryptAlgorithm(crypt,L"aes"); CkCrypt2W_putCipherMode(crypt,L"cbc"); CkCrypt2W_putKeyLength(crypt,256); // We'll need to set the hash algorithm to either MD5 or SHA256. // openssl version 1.0.* or earlier used MD5 by default // openssl version 1.1.* uses SHA-256 for the password to secret key derivation. // For example, if openssl 1.1.0 was used, we should do this: CkCrypt2W_putHashAlgorithm(crypt,L"sha256"); // This example assumes openssl 1.0.2 was used to encrypt what we're now decrypting: CkCrypt2W_putHashAlgorithm(crypt,L"md5"); // The openssl command we are duplicating is: // // openssl enc -d -aes-256-cbc -in hamlet.enc -out hamlet_dec.xml -pass file:./secret.txt // // The file secret.txt contains the word "secret". We could write code to load the contents // of secret.txt, but instead we'll just do this: CkCrypt2W_SetSecretKeyViaPassword(crypt,L"secret"); // Load the file to be decrypted. fileData = CkBinDataW_Create(); success = CkBinDataW_LoadFile(fileData,L"qa_data/openssl_enc/hamlet.enc"); // Decrypt success = CkCrypt2W_DecryptBd(crypt,fileData); // Save the decrypted output. success = CkBinDataW_WriteFile(fileData,L"qa_output/hamlet_dec.xml"); wprintf(L"success = %d\n",success); CkCrypt2W_Dispose(crypt); CkBinDataW_Dispose(fileData); } |
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