CAPLfunctionSecurityLocalSignEd25519

SecurityLocalSignEd25519

Valid for: CANoe DE • CANoe4SW DE

Function Syntax

SecurityLocalSignEd25519(byte[] PrivateKey, dword PrivateKeyLength, byte[] Data, dword DataLength, byte[] Signature, dword& SignatureLength)

Description

Generates signature of data with a given private key using asymmetric Ed25519 signature algorithm.

Parameters

• PrivateKey: Private key to use for signing the data. Expected size is 32 bytes.
• PrivateKeyLength: Size of the private key. Expected size is 32 bytes for Ed25519.
• Data: Buffer containing data to be signed.
• DataLength: Size of the buffer to be signed. Maximum size is 65536 bytes.
• Signature [OUT]: Buffer to store the signature to. Expected size is 64 bytes.
• SignatureLength [IN/OUT]: Size of the buffer to store the signature into. Expected size is 64 bytes. Will be updated with the number of bytes written to the buffer.

Return Values

• 1: Success
  A Value of 1 means that the action was successful.
• <= 0: Error
  A value less than or equal to 0 means error.

Example

byte priv[1000];
byte pub[1000];
byte data[1000];
byte signature[64];
dword verify;

dword privSize;
dword pubSize;
dword dataSize;
dword signatureSize;

privSize = elcount(priv);
pubSize = elcount(pub);
dataSize = elcount(data);
signatureSize = elcount(signature);

verify = 0;

write("SecurityLocalGenerateAsymmetricKeyPair Ed25519");
SecurityLocalGenerateAsymmetricKeyPair(1, priv, privSize, pub, pubSize);

SecurityLocalSignEd25519(priv, privSize, data, dataSize, signature, signatureSize);
SecurityLocalVerifyEd25519(pub, pubSize, data, dataSize, signature, signatureSize, verify);

write("VerificationResult result %ld", verify);

SecurityLocalVerifyEd25519