58 lines
1.7 KiB
JavaScript
58 lines
1.7 KiB
JavaScript
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// taken from https://github.com/crypto-browserify/buffer-reverse/blob/master/inplace.js
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function reverseInplace (buffer) {
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for (var i = 0, j = buffer.length - 1; i < j; ++i, --j) {
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var t = buffer[j];
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buffer[j] = buffer[i];
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buffer[i] = t;
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}
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return buffer;
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}
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function ripemd160 (bytearray) {
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const crypto = require('crypto');
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const secret = 'abcdefg';
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const hash = crypto.createHash('ripemd160', secret)
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.update(bytearray, 'binary', 'binary')
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.digest();
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return hash;
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}
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function sha256 (bytearray) {
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const crypto = require('crypto');
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const secret = 'abcdefg';
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const hash = crypto.createHash('sha256', secret)
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.update(bytearray, 'binary', 'binary')
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.digest();
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return hash;
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}
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export function OutpointToClaimId (outpointstr) {
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var outpointsplit = outpointstr.split(':');
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var outpoint = {txid: outpointsplit[0], vout: outpointsplit[1]};
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// Assuming endianess is LittleEndian - Javacsript endianess depends on hardware.
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// Can check with os.endianness(). Possible values are "BE" or "LE" as of Node.js v0.10.0
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// convert txid to byte array then reverse bytes to get BigEndian
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var txidbytes = Buffer.from(outpoint.txid, 'hex');
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var txidrevbytes = reverseInplace(txidbytes);
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// Get big endian of vout(uint32)
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var voutbytes = Buffer.allocUnsafe(4);
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voutbytes.writeInt32BE(outpoint.vout);
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// Merge arrays
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var claimidbytes = Buffer.concat([txidrevbytes, voutbytes]);
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// Hash - Sha256
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claimidbytes = sha256(claimidbytes);
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// Hash - RipeMD160
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claimidbytes = ripemd160(claimidbytes);
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// Return to little endian.
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claimidbytes = reverseInplace(claimidbytes);
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// Encode to hex string
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var claimid = claimidbytes.toString('hex');
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return claimid;
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}
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