rsa encryption

  1. KMatle

    B4R Tutorial RSA Encryption: Create keys, en-/decrypt, hash, sign/verify signature (clean code)

    This example replaces my previous examples with cleaner inline C coding (I'm getting better :-))using almost all variables from Globals. You can define the keysizes (eg. 2048 or 4096). It's fully compatible with all plattforms (B4x, PHP, OpenSSL, etc.). The ESP's use mbdtls which is included...
  2. KMatle

    B4R Tutorial Updated RSA Encryption between B4x and ESP32's (any other plattform will do, too)

    Here's an updated example how to - generate an RSA keypair (Public and Private key) on a ESP32 and on B4x - export these keys in PEM format (compatible with any other plattform like B4x, .net, php, python, etc.) - exchange the Public Keys (here via WiFi/AsyncStreams) - encrypt and decrypt on...
  3. KMatle

    Android Code Snippet [B4x] Generate RSA private/public key in php and prepare it to use in B4x

    Sometimes it makes sense to generate pricat/public key pairs for clients on the server side by code. Here's an example how to do this in php (OpenSSL must be installed as it usually is): $keys = openssl_pkey_new(array("private_key_bits" => $4096,"private_key_type" => OPENSSL_KEYTYPE_RSA))...
  4. K

    Android Question Saving RSA Generated Key Into KeyStore

    Hello, I'm Kinda New To B4a and for sure using Keystore. (never used before) I'm having a problem where I'm trying to save the new generated pair of RSA, 2048 keys into the KeyStore of where I believe that used to keep the private key safe, and constant where the public key can be saved on a...
  5. KMatle

    B4J Tutorial [B4x] RSA sign & verify messages (extra: with corresponding php code)

    This little tutorial is about signing and verifying data you send/receive between apps (= all "programs", even websites). You can use it in B4A without a change (I don't know how B4i works, but I assume there are similar libs). You should know how RSA works. If not, take a Google search and you...
  6. Pablo Torres

    B4J Question RSA Encription problem

    Hi, I have the following code Dim su As StringUtils Dim Bconv As ByteConverter Dim ForeignPubKeyString As String Dim ForeignPubKeyBytes(0) As Byte Dim ForeignPrivKeyBytes(0) As Byte Dim ForeignPrivKeyString As String Dim...