toBytes method
Generates pseudo-random bytes based on the current transcript state.
This method produces pseudo-random bytes using the current state of the transcript. The generated bytes can be used for various cryptographic purposes. It takes a label and an output length as parameters and appends the label to the transcript.
Parameters:
label
: A list of integers representing the label for the pseudo-random data.outLen
: The length of the pseudo-random data to generate, specified as an integer.
Returns:
A List<int>
containing the pseudo-random bytes of the specified length.
Usage:
MerlinTranscript transcript = MerlinTranscript("MyApp");
List<int> randomBytes = transcript.toBytes("nonce".codeUnits, 16);
// Generate 16 bytes of pseudo-random data with the label "nonce."
This method appends the label to the transcript, ensuring that it influences the generation of pseudo-random bytes. The generated data is suitable for cryptographic operations.
Implementation
List<int> toBytes(List<int> label, int outLen) {
final len = List.filled(4, 0);
writeUint32LE(outLen, len);
List<int> labelSize = [...label, ...len];
strobe.additionalData(true, labelSize);
List<int> outBytes = strobe.pseudoRandomData(outLen);
return BytesUtils.toBytes(outBytes);
}