hello,
i am trying to write a piece of code that will take an unsigned char*
(called Data) and 3DES encode it and then store it in another
unsigned char *. at the bottom of this message are two code
snippets, #1 writes the encrypted data to a file BIO while #2
writes it to a mem BIO. #1 appears to work perfectly, if i use
the "openssl des3" command with the appropiate flags and key
i can decrypt the file that was written. #2 does not work, the
encrypted data produced is always shorter than the data
produced by #1 and i cannot decrypt it. any ideas on why
#2 will not work?
code snippet #1:
------------------------------------------------------------------------
const EVP_CIPHER *cipher=NULL;
unsigned char *SaltPtr=NULL;
unsigned char Salt[PKCS5_SALT_LEN];
unsigned char Key[24], MD[MD5_DIGEST_LENGTH];
BIO *OutData, *EncBio=NULL;
BUF_MEM *OutDataBuf=NULL;
static const char magic[]="Salted__";
int DataLen=0;
OpenSSL_add_all_algorithms();
cipher = EVP_get_cipherbyname("des3");
OutData = BIO_new(BIO_s_file());
if (BIO_write_filename(OutData, "mytest.des") <= 0)
{
printf("Error with BIO_write\n");
goto end;
}
if (RAND_pseudo_bytes(Salt, PKCS5_SALT_LEN) < 0)
{
printf("Error with RAND_pseudo_bytes\n");
return (1);
}
if ((BIO_write(OutData, magic, sizeof(magic)-1) != sizeof(magic)-1)
|| (BIO_write(OutData, (char *) Salt, PKCS5_SALT_LEN) !=
PKCS5_SALT_LEN))
{
printf("Error writing salt\n");
goto end;
}
SaltPtr = Salt;
EVP_BytesToKey(cipher, EVP_md5(), SaltPtr,
(unsigned char *) Passwd,
strlen(Passwd), 1, Key, MD);
if (!(EncBio=BIO_new(BIO_f_cipher())))
goto end;
BIO_set_cipher(EncBio, cipher, Key, MD, 1);
if (EncBio)
{
OutData = BIO_push(EncBio, OutData);
}
if (BIO_write(OutData, (char *)Data, strlen(Data)) != strlen(Data))
{
printf("Error writing Data\n");
goto end;
}
---------------------------------------------------------------------
code snippet #2:
----------------------------------------------------------------------
const EVP_CIPHER *cipher=NULL;
unsigned char *SaltPtr=NULL;
unsigned char Salt[PKCS5_SALT_LEN];
unsigned char Key[24], MD[MD5_DIGEST_LENGTH];
BIO *OutData, *EncBio=NULL;
BUF_MEM *OutDataBuf=NULL;
static const char magic[]="Salted__";
int DataLen=0, ret=0;
OpenSSL_add_all_algorithms();
cipher = EVP_get_cipherbyname("des3");
OutData = BIO_new(BIO_s_mem());
if (RAND_pseudo_bytes(Salt, PKCS5_SALT_LEN) < 0)
{
printf("Error with RAND_pseudo_bytes \n");
return (1);
}
if ((BIO_write(OutData, magic, sizeof(magic)-1) != sizeof(magic)-1) ||
(BIO_write(OutData, (char *) Salt, PKCS5_SALT_LEN) !=
PKCS5_SALT_LEN))
{
printf("Error writing salt\n");
goto end;
}
EVP_BytesToKey(cipher, EVP_md5(), SaltPtr,
(unsigned char *) Passwd,
strlen(Passwd), 1, Key, MD);
if (!(EncBio=BIO_new(BIO_f_cipher())))
goto end;
BIO_set_cipher(EncBio, cipher, Key, MD, 1);
if (EncBio)
{
OutData = BIO_push(EncBio, OutData);
}
if (BIO_write(OutData, (char *)Data, strlen(Data)) != strlen(Data))
{
printf("Error writing Data\n");
goto end;
}
BIO_get_mem_ptr(OutData, &OutDataBuf);
DataLen = OutDataBuf->length;
OutBuf = OutDataBuf->data;
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