21 lines
602 B
JavaScript
21 lines
602 B
JavaScript
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import { JOSENotSupported } from '../util/errors.js';
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import random from '../runtime/random.js';
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export function bitLength(alg) {
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switch (alg) {
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case 'A128GCM':
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return 128;
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case 'A192GCM':
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return 192;
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case 'A256GCM':
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case 'A128CBC-HS256':
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return 256;
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case 'A192CBC-HS384':
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return 384;
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case 'A256CBC-HS512':
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return 512;
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default:
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throw new JOSENotSupported(`Unsupported JWE Algorithm: ${alg}`);
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}
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}
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export default (alg) => random(new Uint8Array(bitLength(alg) >> 3));
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