do any body use Openssl Library in LabView?
I'm trying to use mostly to Encrypt Text strings on AES-128-ccm.
I been looking all the forum and I can't find anything.
I Install the latest version of Openssl Library in my Windows platform.
Y developed a .dll using the Openssl in Visual Studio 2017 and looks than works in LabView, but it is unstable, some time makes the LabView Crush, the code works fine if I run into VisualStudio (with modifications for command prompt), but not for LabView (50% of time works fine)
This is my c++ code for one function:
/****************************************************************************
FUNCTION: encryptMessage(unsigned char *plaintext, int plaintext_len, unsigned char *key,
unsigned char *iv, unsigned char *ciphertext)
ARGUMENTS: plaintext - Message to Encrypt
plaintext_len - size of Message
key - Encryption key
iv - initialization vector
ciphertext - array where to put encrypted message
RETURN: STATUS - OK if success; otherwise not OK
DESCRIPTION: This method encrypts the message into plaintext
*****************************************************************************/
int encryptMessage(uint8_t *plaintext, int plaintext_len, uint8_t *key, uint8_t *iv, uint8_t *ciphertext, uint8_t tag[TAG_LEN], char *comment)
{
EVP_CIPHER_CTX *ctx;
uint8_t texttoencrypt[27];
int ciphertext_len, len;
int ret;
memset(texttoencrypt, 0, 27);
memcpy(texttoencrypt, plaintext, plaintext_len);
ctx = EVP_CIPHER_CTX_new();
// Set cipher type and mode
ret = EVP_EncryptInit_ex(ctx, EVP_aes_128_ccm(), NULL, NULL, NULL);
if (ret != 1)
{
comment = (char *) "Encrypt Message: Init AES CCM Error...";
EVP_CIPHER_CTX_free(ctx);
return -1;
}
// Set nonce length (13)
ret = EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_SET_IVLEN, IV_LEN, NULL);
if (ret != 1)
{
comment = (char *) "Encrypt Message: Set IV LEN Error ...";
EVP_CIPHER_CTX_free(ctx);
return -2;
}
// Set tag length
ret = EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_SET_TAG, TAG_LEN, NULL);
if (ret != 1)
{
comment = (char *) "Encrypt Message: TAG Error ...";
EVP_CIPHER_CTX_free(ctx);
return -3;
}
// Initialize key and IV
ret = EVP_EncryptInit_ex(ctx, NULL, NULL, key, iv);
if (ret != 1)
{
comment = (char *) "Encrypt Message: Set KEY and NONCE Error ...";
EVP_CIPHER_CTX_free(ctx);
return -4;
}
// set total plaintext length
ret = EVP_EncryptUpdate(ctx, NULL, &len, NULL, sizeof(texttoencrypt));
if (ret != 1)
{
comment = (char *) "Encrypt Message: set plaintext Error ...";
EVP_CIPHER_CTX_free(ctx);
return -5;
}
/* Encrypt plaintext: can only be called once */
ret = EVP_EncryptUpdate(ctx, ciphertext, &len, texttoencrypt, sizeof(texttoencrypt));
if (ret != 1)
{
comment = (char *) "Encrypt Message: Encrypt plaintext ...";
EVP_CIPHER_CTX_free(ctx);
return -6;
}
ciphertext_len = len;
// Finalize: note get no output for CCM
ret = EVP_EncryptFinal_ex(ctx, ciphertext + len, &len);
if (ret != 1)
{
comment = (char *) "Encrypt Message: Finalize Encrypt error ...";
EVP_CIPHER_CTX_free(ctx);
return -7;
}
ciphertext_len += len;
comment = (char *) "Encrypt Message: Success ...";
EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_GET_TAG, TAG_LEN, tag);
EVP_CIPHER_CTX_free(ctx);
return ciphertext_len;
}
Thank you for your Help
