Modifying SE05X Library on Arduino Portenta C33 for Custom Crypto Key Generation (SECP256K1)

MaxMustermann84 — Wed, 31 Jan 2024 09:17:35 GMT

I'm working with an Arduino Portenta C33 and am facing a challenge related to its integrated SE05X security element. The current SE05X library allows for the generation of ECCurve_NIST_P256 key pairs (https://github.com/arduino/ArduinoCore-renesas/blob/main/libraries/SE05X/examples/SE05XPrivateKey/SE05XPrivateKey.ino), but I need to generate a key pair using the SECP256K1 curve. Does anyone have example code or tips on how to solve this problem?

/* SE05X Private Key This sketch uses the SE05X to generate a new EC NIST P-256 keypair and store it with id 999, then the public key is printed in DER format. Circuit: - Portenta C33 */ #include <SE05X.h> #include <Wire.h> void printBufferHex(const byte input[], size_t inputLength) { for (size_t i = 0; i < inputLength; i++) { Serial.print(input[i] >> 4, HEX); Serial.print(input[i] & 0x0f, HEX); } Serial.println(); } void setup() { Serial.begin(9600); while (!Serial); if (!SE05X.begin()) { Serial.println("Failed to communicate with SE05X!"); while (1); } const int KeyId = 999; byte derBuf[256]; size_t derSize; SE05X.generatePrivateKey(KeyId, derBuf, sizeof(derBuf), &derSize); printBufferHex(derBuf, derSize); } void loop() { }

Re: Modifying SE05X Library on Arduino Portenta C33 for Custom Crypto Key Generation (SECP256K1)

Kan_Li — Thu, 01 Feb 2024 09:52:30 GMT

Hi @MaxMustermann84 ,

I think you have to find the curve type definition in the SE05X Library on Arduino Portenta C33 and change it from ECCurve_NIST_P256 to ECCurve_SECP256K1. Please kindly refer to the following for more details.

Have a great day,
Kan

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topic Re: Modifying SE05X Library on Arduino Portenta C33 for Custom Crypto Key Generation (SECP256K1) in Smart Cards and Secure Element

Modifying SE05X Library on Arduino Portenta C33 for Custom Crypto Key Generation (SECP256K1)

Re: Modifying SE05X Library on Arduino Portenta C33 for Custom Crypto Key Generation (SECP256K1)