OK, so after the last post I made; I was trying to use the DES library, and
was advised to use the higher level EVP library, I have now used this and
getting the same type of error! %-|
So where do I go from here. The command line that i wish to use for
decrypting the file that i am encrypting is
openssl des3 -d -nosalt -k "1" -in <source filename> -out <destination
filename>
The code that i am using to test these has two file streams, one for the
input and one for the output and is shown below. This is test code only.
What am i doing wrong here? Is it the key that is at fault. Please help...
I also wish to use salt in the final implementation on this. Please
advise...
if(infile == NULL)
AfxMessageBox("File load error");
fseek(infile, 0L, SEEK_END);
numbytes = ftell(infile);
fseek(infile, 0L, SEEK_SET);
buffer = (char*)calloc(numbytes, sizeof(char));
fread(buffer, sizeof(char), numbytes, infile);
unsigned char* input = new unsigned char[numbytes];
input = (unsigned char*)buffer;
if(buffer == NULL)
AfxMessageBox("Error with buffer");
unsigned char password[] = {'1'};
EVP_CIPHER_CTX ctx;
EVP_CIPHER_CTX_init(&ctx);
unsigned char* desBuf = new unsigned char[numbytes];
EVP_EncryptInit_ex(&ctx, EVP_des_ede3_cbc(), NULL,password,NULL);
if(!EVP_EncryptUpdate(&ctx,desBuf,&outlen,input,numbytes))
{
AfxMessageBox("error 1");
}
if(!EVP_EncryptFinal_ex(&ctx, desBuf+ outlen, &tmplen))
{
AfxMessageBox("error 2");
/* Error */
}
EVP_CIPHER_CTX_cleanup(&ctx);
outlen += tmplen;
fwrite(desBuf, 1, outlen, outfile);
fclose(outfile);
fclose(infile);
--
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