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67 lines
2.2 KiB
JavaScript
67 lines
2.2 KiB
JavaScript
const ASYMMETRIC_KEY_DETAILS_SUPPORTED = require('./asymmetricKeyDetailsSupported');
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const RSA_PSS_KEY_DETAILS_SUPPORTED = require('./rsaPssKeyDetailsSupported');
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const allowedAlgorithmsForKeys = {
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'ec': ['ES256', 'ES384', 'ES512'],
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'rsa': ['RS256', 'PS256', 'RS384', 'PS384', 'RS512', 'PS512'],
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'rsa-pss': ['PS256', 'PS384', 'PS512']
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};
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const allowedCurves = {
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ES256: 'prime256v1',
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ES384: 'secp384r1',
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ES512: 'secp521r1',
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};
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module.exports = function(algorithm, key) {
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if (!algorithm || !key) return;
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const keyType = key.asymmetricKeyType;
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if (!keyType) return;
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const allowedAlgorithms = allowedAlgorithmsForKeys[keyType];
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if (!allowedAlgorithms) {
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throw new Error(`Unknown key type "${keyType}".`);
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}
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if (!allowedAlgorithms.includes(algorithm)) {
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throw new Error(`"alg" parameter for "${keyType}" key type must be one of: ${allowedAlgorithms.join(', ')}.`)
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}
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/*
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* Ignore the next block from test coverage because it gets executed
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* conditionally depending on the Node version. Not ignoring it would
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* prevent us from reaching the target % of coverage for versions of
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* Node under 15.7.0.
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*/
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/* istanbul ignore next */
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if (ASYMMETRIC_KEY_DETAILS_SUPPORTED) {
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switch (keyType) {
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case 'ec':
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const keyCurve = key.asymmetricKeyDetails.namedCurve;
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const allowedCurve = allowedCurves[algorithm];
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if (keyCurve !== allowedCurve) {
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throw new Error(`"alg" parameter "${algorithm}" requires curve "${allowedCurve}".`);
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}
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break;
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case 'rsa-pss':
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if (RSA_PSS_KEY_DETAILS_SUPPORTED) {
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const length = parseInt(algorithm.slice(-3), 10);
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const { hashAlgorithm, mgf1HashAlgorithm, saltLength } = key.asymmetricKeyDetails;
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if (hashAlgorithm !== `sha${length}` || mgf1HashAlgorithm !== hashAlgorithm) {
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throw new Error(`Invalid key for this operation, its RSA-PSS parameters do not meet the requirements of "alg" ${algorithm}.`);
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}
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if (saltLength !== undefined && saltLength > length >> 3) {
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throw new Error(`Invalid key for this operation, its RSA-PSS parameter saltLength does not meet the requirements of "alg" ${algorithm}.`)
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}
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}
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break;
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}
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}
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}
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