25 lines
757 B
JavaScript
25 lines
757 B
JavaScript
import { util } from './crypto.js'
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export function HMAC(hasher, message, key, options) {
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const _blocksize = 16
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// Allow arbitrary length keys
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key = key.length > _blocksize * 4 ?
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hasher(key, { asBytes: true }) :
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util.stringToBytes(key);
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// XOR keys with pad constants
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var okey = key,
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ikey = key.slice(0);
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for (var i = 0; i < _blocksize * 4; i++) {
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okey[i] ^= 0x5C;
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ikey[i] ^= 0x36;
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}
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var hmacbytes = hasher(util.bytesToString(okey) +
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hasher(util.bytesToString(ikey) + message, { asString: true }),
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{ asBytes: true });
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return options && options.asBytes ? hmacbytes :
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options && options.asString ? util.bytesToString(hmacbytes) :
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util.bytesToHex(hmacbytes);
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} |