29 lines
998 B
JavaScript
29 lines
998 B
JavaScript
const { createHmac } = require('crypto')
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const { KEYOBJECT } = require('../help/consts')
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const timingSafeEqual = require('../help/timing_safe_equal')
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const resolveNodeAlg = require('../help/node_alg')
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const { asInput } = require('../help/key_object')
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const sign = (jwaAlg, hmacAlg, { [KEYOBJECT]: keyObject }, payload) => {
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const hmac = createHmac(hmacAlg, asInput(keyObject, false))
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hmac.update(payload)
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return hmac.digest()
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}
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const verify = (jwaAlg, hmacAlg, key, payload, signature) => {
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const expected = sign(jwaAlg, hmacAlg, key, payload)
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const actual = signature
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return timingSafeEqual(actual, expected)
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}
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module.exports = (JWA, JWK) => {
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['HS256', 'HS384', 'HS512'].forEach((jwaAlg) => {
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const hmacAlg = resolveNodeAlg(jwaAlg)
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JWA.sign.set(jwaAlg, sign.bind(undefined, jwaAlg, hmacAlg))
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JWA.verify.set(jwaAlg, verify.bind(undefined, jwaAlg, hmacAlg))
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JWK.oct.sign[jwaAlg] = JWK.oct.verify[jwaAlg] = key => key.use === 'sig' || key.use === undefined
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})
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}
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