On Mon, Aug 10, 2009, MusicAndy wrote:
>
> Thanks for your help so far, but still cannot get this working...
>
> Here is my latest code.
>
> I am trying to emulate something that should be simple, which can be
> decrypted using
> openssl des3 -d -nosalt -k "1" -in <source filename> -out <destination
> > filename>
>
>
>
> EVP_CIPHER_CTX ctx;
> EVP_CIPHER_CTX_init(&ctx);
> const EVP_CIPHER* cipher=EVP_des_ede3_cbc();
> const EVP_MD *dgst=EVP_sha1();
>
> u_char pass[8];
> // char salt[8];
>
> unsigned char key[EVP_MAX_KEY_LENGTH];
> unsigned char iv[EVP_MAX_IV_LENGTH];
>
>
>
> // printf("key_len: %d\n", cipher->key_len);
> // printf(" iv_len: %d\n", cipher->iv_len);
>
> strcpy((char*)pass, "1");
> // strcpy((char*)salt, "ATHENA.MIT.EDUraeburn");
>
>
> EVP_BytesToKey(cipher,dgst,NULL,pass, 1, 3, key, iv);
>
> unsigned char* desBuf = new unsigned char[numbytes];
>
> EVP_EncryptInit_ex(&ctx, cipher, NULL,key,iv);
>
The count parameter must be 1, not 3 for compatibility with the enc program.
Also make sure the file is opened in binary mode ("rb").
You can use the -P option to "enc" and print out the key, IV in your programe
to ensure they are identical.
Steve.
--
Dr Stephen N. Henson. OpenSSL project core developer.
Commercial tech support now available see: http://www.openssl.org
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