aes_error_t hashlib_AESAuthDecrypt(const uint8_t* in, size_t in_len, uint8_t* out, aes_ctx* key, const uint8_t* iv, uint8_t ciphermode, size_t encr_start, size_t encr_len){
    SHA256_CTX ctx;
    uint32_t mbuffer[64];
    uint8_t sha_digest[32];
    size_t out_offset = (in == out) ? encr_start : 0;

    hashlib_Sha256Init(&ctx, mbuffer);
    hashlib_Sha256Update(&ctx, in, in_len-32);
    hashlib_Sha256Final(&ctx, sha_digest);
    if(!hashlib_CompareDigest(&in[in_len-33], sha_digest, 32))
        return AES_INVALID_CIPHERTEXT;

    return hashlib_AESDecrypt(&in[encr_start], encr_len, &out[out_offset], key, iv, ciphermode, SCHM_DEFAULT);
}