The Key looks completely different in command line to my program. Why would
this be the case when i am calling the bytes to key function???? I am using
a password of "1" therefore in the C++ do I need to do the same.. do I need
to pad out the password in the C++?
Help :(
MusicAndy wrote:
>
> Thanks again Steve,
>
> However the EVP_MAX_KEY_LENGTH appears to be a length of 32, not 24 that
> DES3 requires. Therefore when i call EVP_EncryptInit_ex I am only going
> to send 24 characters of this key, and see what happens then.
>
> It should only be sending 24 characters shouldnt it?
>
>
> Dr. Stephen Henson wrote:
>>
>> 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
>> ______________________________________________________________________
>> OpenSSL Project http://www.openssl.org
>> User Support Mailing List openssl-users@openssl.org
>> Automated List Manager majord...@openssl.org
>>
>>
>
>
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