NEED HELP To Implement OpenSSL Compliant Encryption On FPGA

[bornlibra23]

Reference:
https://github.com/Xilinx/Vitis_Libraries/blob/main/security/L1/include/xf_security/gcm.hpp

TLDR:
Current implementation expects & reuses the IV with each call. I need to to work more like OpenSSL where it can mutate the IV for subsequent calls.

Details:
The current implementation of aes256GcmEncrypt & aes256GcmDecrypt are single shot functions unsuitable for implementing OpenSSL compliant encryption on successive blocks of data. They behave similar to aes_gcm_encrypt & aes_gcm_decrypt in https://github.com/openssl/openssl/blob/OpenSSL_1_1_1-stable/demos/evp/aesgcm.c

I need them to work like EVP_EncryptUpdate & EVP_DecryptUpdate in OpenSSL
Here is my production tested wrapper code:

#include <openssl11/openssl/evp.h>
class crypto
{
    using cryptoKey_t = char[32];
    using cryptoIV_t = char[16];
    cryptoKey_t cryptoKey;
    cryptoIV_t cryptoIV;

    EVP_CIPHER_CTX *enc_ctx;
    EVP_CIPHER_CTX *dec_ctx;

    public:
        bool initialize(cryptoKey_t cryptoKey, cryptoIV_t cryptoIV, uint8_t ivLength);
        bool encrypt(const unsigned char *plainText, int plainTextLength, unsigned char *cipherText, int& cipherTextLength);
        bool decrypt(const unsigned char *cipherText, int cipherTextLength, unsigned char *plainText, int& plainTextLength);
};

bool crypto::initialize(cryptoKey_t cryptoKey, cryptoIV_t cryptoIV, uint8_t ivLength)
{
    enc_ctx = EVP_CIPHER_CTX_new();
    EVP_EncryptInit_ex(enc_ctx, EVP_aes_256_gcm(), NULL, NULL, NULL);
    EVP_CIPHER_CTX_ctrl(enc_ctx, EVP_CTRL_GCM_SET_IVLEN, ivLength, NULL);
    EVP_EncryptInit_ex(enc_ctx, NULL, NULL, reinterpret_cast<const unsigned char*>(cryptoKey), reinterpret_cast<const unsigned char*>(cryptoIV));

    dec_ctx = EVP_CIPHER_CTX_new();
    EVP_DecryptInit_ex(dec_ctx, EVP_aes_256_gcm(), NULL, NULL, NULL);
    EVP_CIPHER_CTX_ctrl(dec_ctx, EVP_CTRL_GCM_SET_IVLEN, ivLength, NULL);
    EVP_DecryptInit_ex(dec_ctx, NULL, NULL, reinterpret_cast<const unsigned char*>(cryptoKey), reinterpret_cast<const unsigned char*>(cryptoIV));

    return(true);
}
bool crypto::encrypt(const unsigned char *plainText, int plainTextLength, unsigned char *cipherText, int& cipherTextLength)
{
    return(EVP_EncryptUpdate(enc_ctx, cipherText, &cipherTextLength, plainText, plainTextLength));
}
bool crypto::decrypt(const unsigned char *cipherText, int cipherTextLength, unsigned char *plainText, int& plainTextLength)
{
    return(EVP_DecryptUpdate(dec_ctx, plainText, &plainTextLength, cipherText, cipherTextLength));
}

[bornlibra23]

I have managed to implement OpenSSL sequential compatibility for 16 byte messages. I need help with implementing for case involving residue bytes.

[bornlibra23]

I have managed to implement OpenSSL sequential compatibility for variable byte messages. I need help with implementing test cases.

[bornlibra23]

I have managed to implement OpenSSL sequential test cases. I need help with implementing the decryption logic & test cases.