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crypto: runtime-deprecate calling Hmac.digest() more than once
Emit a DEP0206 deprecation warning when Hmac.digest() is called on an already-finalized instance. This behavior is inconsistent with Hash.digest() which throws ERR_CRYPTO_HASH_FINALIZED. Fixes: #62838 Co-authored-by: Filip Skokan <panva.ip@gmail.com> Signed-off-by: developers-universe-1 <madelynreyes2026@gmail.com> Signed-off-by: Filip Skokan <panva.ip@gmail.com> PR-URL: #63624 Reviewed-By: Filip Skokan <panva.ip@gmail.com> Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>
1 parent 723dd38 commit 463e56f

5 files changed

Lines changed: 85 additions & 53 deletions

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‎doc/api/deprecations.md‎

Lines changed: 4 additions & 1 deletion
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@@ -4562,12 +4562,15 @@ removed in a future version of Node.js.
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<!-- YAML
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changes:
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- version: REPLACEME
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pr-url: https://github.com/nodejs/node/pull/63624
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description: Runtime deprecation.
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- version: v26.2.0
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pr-url: https://github.com/nodejs/node/pull/63121
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description: Documentation-only deprecation.
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-->
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Type: Documentation-only
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Type: Runtime
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Calling `hmac.digest()` more than once returns an empty buffer instead of
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throwing an error. This behavior is inconsistent with `hash.digest()` and

‎lib/internal/crypto/hash.js‎

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Original file line numberDiff line numberDiff line change
@@ -87,6 +87,11 @@ const maybeEmitDeprecationWarning = getDeprecationWarningEmitter(
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},
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);
8989

90+
const emitHmacDigestDeprecation = getDeprecationWarningEmitter(
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'DEP0206',
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'Calling Hmac.digest() more than once is deprecated.',
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);
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9095
function Hash(algorithm, options) {
9196
if (!new.target)
9297
return new Hash(algorithm, options);
@@ -187,6 +192,7 @@ Hmac.prototype.digest = function digest(outputEncoding) {
187192
const state = this[kState];
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189194
if (state[kFinalized]) {
195+
emitHmacDigestDeprecation();
190196
const buf = Buffer.from('');
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if (outputEncoding && outputEncoding !== 'buffer')
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return buf.toString(outputEncoding);

‎test/parallel/test-crypto-dep0181.js‎

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@@ -0,0 +1,19 @@
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'use strict';
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const common = require('../common');
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if (!common.hasCrypto)
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common.skip('missing crypto');
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const assert = require('assert');
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const crypto = require('crypto');
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10+
common.expectWarning({
11+
DeprecationWarning: {
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DEP0181: 'crypto.Hmac constructor is deprecated.',
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},
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});
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const Hmac = crypto.Hmac;
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const instance = crypto.Hmac('sha256', 'Node');
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assert(instance instanceof Hmac, 'Hmac is expected to return a new instance' +
19+
' when called without `new`');

‎test/parallel/test-crypto-dep0206.js‎

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@@ -0,0 +1,56 @@
1+
'use strict';
2+
3+
const common = require('../common');
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if (!common.hasCrypto)
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common.skip('missing crypto');
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7+
const assert = require('assert');
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const crypto = require('crypto');
9+
10+
common.expectWarning({
11+
DeprecationWarning: {
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DEP0206: 'Calling Hmac.digest() more than once is deprecated.',
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},
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});
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16+
// Verify runtime deprecation warning for calling digest() more than once.
17+
{
18+
const h = crypto.createHmac('sha1', 'key').update('data');
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h.digest('hex');
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h.digest('hex');
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}
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// Check initialized -> uninitialized state transition after calling digest().
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{
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const expected =
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'\u0010\u0041\u0052\u00c5\u00bf\u00dc\u00a0\u007b\u00c6\u0033' +
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'\u00ee\u00bd\u0046\u0019\u009f\u0002\u0055\u00c9\u00f4\u009d';
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{
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const h = crypto.createHmac('sha1', 'key').update('data');
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assert.deepStrictEqual(h.digest('buffer'), Buffer.from(expected, 'latin1'));
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assert.deepStrictEqual(h.digest('buffer'), Buffer.from(''));
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}
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{
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const h = crypto.createHmac('sha1', 'key').update('data');
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assert.strictEqual(h.digest('latin1'), expected);
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assert.strictEqual(h.digest('latin1'), '');
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}
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}
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// Check initialized -> uninitialized state transition after calling digest().
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// Calls to update() omitted intentionally.
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{
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const expected =
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'\u00f4\u002b\u00b0\u00ee\u00b0\u0018\u00eb\u00bd\u0045\u0097' +
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'\u00ae\u0072\u0013\u0071\u001e\u00c6\u0007\u0060\u0084\u003f';
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{
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const h = crypto.createHmac('sha1', 'key');
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assert.deepStrictEqual(h.digest('buffer'), Buffer.from(expected, 'latin1'));
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assert.deepStrictEqual(h.digest('buffer'), Buffer.from(''));
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}
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{
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const h = crypto.createHmac('sha1', 'key');
53+
assert.strictEqual(h.digest('latin1'), expected);
54+
assert.strictEqual(h.digest('latin1'), '');
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}
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}

‎test/parallel/test-crypto-hmac.js‎

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Original file line numberDiff line numberDiff line change
@@ -7,13 +7,6 @@ if (!common.hasCrypto) {
77
const assert = require('assert');
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const crypto = require('crypto');
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10-
{
11-
const Hmac = crypto.Hmac;
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const instance = crypto.Hmac('sha256', 'Node');
13-
assert(instance instanceof Hmac, 'Hmac is expected to return a new instance' +
14-
' when called without `new`');
15-
}
16-
1710
assert.throws(
1811
() => crypto.createHmac(null),
1912
{
@@ -411,41 +404,6 @@ assert.strictEqual(
411404
crypto.createHmac('sha256', 'w00t').digest('ucs2'),
412405
crypto.createHmac('sha256', 'w00t').digest().toString('ucs2'));
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414-
// Check initialized -> uninitialized state transition after calling digest().
415-
{
416-
const expected =
417-
'\u0010\u0041\u0052\u00c5\u00bf\u00dc\u00a0\u007b\u00c6\u0033' +
418-
'\u00ee\u00bd\u0046\u0019\u009f\u0002\u0055\u00c9\u00f4\u009d';
419-
{
420-
const h = crypto.createHmac('sha1', 'key').update('data');
421-
assert.deepStrictEqual(h.digest('buffer'), Buffer.from(expected, 'latin1'));
422-
assert.deepStrictEqual(h.digest('buffer'), Buffer.from(''));
423-
}
424-
{
425-
const h = crypto.createHmac('sha1', 'key').update('data');
426-
assert.strictEqual(h.digest('latin1'), expected);
427-
assert.strictEqual(h.digest('latin1'), '');
428-
}
429-
}
430-
431-
// Check initialized -> uninitialized state transition after calling digest().
432-
// Calls to update() omitted intentionally.
433-
{
434-
const expected =
435-
'\u00f4\u002b\u00b0\u00ee\u00b0\u0018\u00eb\u00bd\u0045\u0097' +
436-
'\u00ae\u0072\u0013\u0071\u001e\u00c6\u0007\u0060\u0084\u003f';
437-
{
438-
const h = crypto.createHmac('sha1', 'key');
439-
assert.deepStrictEqual(h.digest('buffer'), Buffer.from(expected, 'latin1'));
440-
assert.deepStrictEqual(h.digest('buffer'), Buffer.from(''));
441-
}
442-
{
443-
const h = crypto.createHmac('sha1', 'key');
444-
assert.strictEqual(h.digest('latin1'), expected);
445-
assert.strictEqual(h.digest('latin1'), '');
446-
}
447-
}
448-
449407
{
450408
assert.throws(
451409
() => crypto.createHmac('sha7', 'key'),
@@ -460,13 +418,3 @@ assert.strictEqual(
460418
crypto.createHmac('sha256', keyObject).update('foo').digest(),
461419
);
462420
}
463-
464-
{
465-
crypto.Hmac('sha256', 'Node');
466-
common.expectWarning({
467-
DeprecationWarning: [
468-
['crypto.Hmac constructor is deprecated.',
469-
'DEP0181'],
470-
]
471-
});
472-
}

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