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<script type="text/javascript">
description("Test HKDF deriveBits operation for corner-case length values");

jsTestIsAsync = true;

var nonExtractable = false;
var rawKey = asciiToUint8Array("jnOw99oOZFLIEPMr");
var info = asciiToUint8Array("jnOw99oO");
var salt = asciiToUint8Array("jnOw99oO");

crypto.subtle.importKey("raw", rawKey, "HKDF", nonExtractable, ["deriveBits"]).then(function(result) {
    baseKey = result;

    deriveBits = function(hash, length) {
        return crypto.subtle.deriveBits({name: "HKDF", info: info, salt: salt, hash: hash}, baseKey, length);
    };

    // For each SHA algorithm and the corresponding HashLen length, we check that:
    //   - deriving with zero length rejects,
    //   - deriving with 8, HashLen * 8 and 255 * HashLen * 8 resolves,
    //   - deriving with 256 * HashLen * 8 rejects.

    return Promise.resolve().then(function(result) {
        // SHA-1, hash output length is 20 bytes
        return shouldReject('deriveBits("sha-1", 0)').then(function(result) {
            return Promise.all([
                deriveBits("sha-1", 8),
                deriveBits("sha-1", 20 * 8),
                deriveBits("sha-1", 255 * 20 * 8)
            ]).then(function(result) {
                testPassed("Bit derivations for SHA-1 with minimum, maximum and HashLen lengths all passed");
                return shouldReject('deriveBits("sha-1", 256 * 20 * 8)');
            });
        });
    }).then(function(result) {
        // SHA-224, hash output length is 28 bytes
        return shouldReject('deriveBits("sha-224", 0)').then(function(result) {
            return Promise.all([
                deriveBits("sha-224", 8),
                deriveBits("sha-224", 28 * 8),
                deriveBits("sha-224", 255 * 28 * 8)
            ]).then(function(result) {
                testPassed("Bit derivations for SHA-224 with minimum, maximum and HashLen lengths all passed");
                return shouldReject('deriveBits("sha-224", 256 * 28 * 8)');
            });
        });
    }).then(function(result) {
        // SHA-256, hash output length is 32 bytes
        return shouldReject('deriveBits("sha-256", 0)').then(function(result) {
            return Promise.all([
                deriveBits("sha-256", 8),
                deriveBits("sha-256", 32 * 8),
                deriveBits("sha-256", 255 * 32 * 8)
            ]).then(function(result) {
                testPassed("Bit derivations for SHA-256 with minimum, maximum and HashLen lengths all passed");
                return shouldReject('deriveBits("sha-256", 256 * 32 * 8)');
            });
        });
    }).then(function(result) {
        // SHA-384, hash output length is 48 bytes
        return shouldReject('deriveBits("sha-384", 0)').then(function(result) {
            return Promise.all([
                deriveBits("sha-384", 8),
                deriveBits("sha-384", 48 * 8),
                deriveBits("sha-384", 255 * 48 * 8)
            ]).then(function(result) {
                testPassed("Bit derivations for SHA-384 with minimum, maximum and HashLen lengths all passed");
                return shouldReject('deriveBits("sha-384", 256 * 48 * 8)');
            });
        });
    }).then(function(result) {
        // SHA-512, hash output length is 64 bytes
        return shouldReject('deriveBits("sha-512", 0)').then(function(result) {
            return Promise.all([
                deriveBits("sha-512", 8),
                deriveBits("sha-512", 64 * 8),
                deriveBits("sha-512", 255 * 64 * 8)
            ]).then(function(result) {
                testPassed("Bit derivations for SHA-512 with minimum, maximum and HashLen lengths all passed");
                return shouldReject('deriveBits("sha-512", 256 * 64 * 8)');
            });
        });
    });
}).then(finishJSTest, finishJSTest);

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