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
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>
>
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