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crypto: add support for SM2 #37066

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70988ea
crypto: add 'sm2' key type and key pair generation
tniessen Jan 24, 2021
4282617
crypto: add support for SM2 one-shot signatures
tniessen Jan 24, 2021
a52008c
crypto: allow adjusting key type on import
tniessen Jan 25, 2021
a76c7e4
test: ensure EC keys on the SM2 curve work
tniessen Jan 25, 2021
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51 changes: 45 additions & 6 deletions doc/api/crypto.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1307,6 +1307,9 @@ API using additional attributes.
<!-- YAML
added: v11.6.0
changes:
- version: REPLACEME
pr-url: ???
description: Added support for `'sm2'`.
- version:
- v13.9.0
- v12.17.0
Expand Down Expand Up @@ -1336,6 +1339,7 @@ types are:
* `'rsa-pss'` (OID 1.2.840.113549.1.1.10)
* `'dsa'` (OID 1.2.840.10040.4.1)
* `'ec'` (OID 1.2.840.10045.2.1)
* `'sm2'` (OID 1.2.840.10045.2.1)
* `'x25519'` (OID 1.3.101.110)
* `'x448'` (OID 1.3.101.111)
* `'ed25519'` (OID 1.3.101.112)
Expand Down Expand Up @@ -2356,6 +2360,9 @@ input.on('readable', () => {
<!-- YAML
added: v11.6.0
changes:
- version: REPLACEME
pr-url: ???
description: Add `asymmetricKeyType` option.
- version: v15.0.0
pr-url: https://github.com/nodejs/node/pull/35093
description: The key can also be an ArrayBuffer. The encoding option was
Expand All @@ -2371,6 +2378,7 @@ changes:
required only if the `format` is `'der'` and ignored if it is `'pem'`.
* `passphrase`: {string | Buffer} The passphrase to use for decryption.
* `encoding`: {string} The string encoding to use when `key` is a string.
* `asymmetricKeyType` {string} The requested asymmetric key type.
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@jasnell jasnell Jan 25, 2021 •
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It would be good to document the expected values here (or link to where they are documented)

(I know there's a paragraph added below but listing the values here would be helpful)

* Returns: {KeyObject}
<!--lint enable maximum-line-length remark-lint-->

Expand All @@ -2381,10 +2389,18 @@ must be an object with the properties described above.
If the private key is encrypted, a `passphrase` must be specified. The length
of the passphrase is limited to 1024 bytes.

If the `asymmetricKeyType` is specified, Node.js will attempt to assign the
given type to the key. This can be used, for example, to distinguish between
EC keys on the SM2 curve (`'ec'`) and SM2 keys (`'sm2'`). If the given type
cannot be assigned to the key, the function fails.

### `crypto.createPublicKey(key)`
<!-- YAML
added: v11.6.0
changes:
- version: REPLACEME
pr-url: ???
description: Add `asymmetricKeyType` option.
- version: v15.0.0
pr-url: https://github.com/nodejs/node/pull/35093
description: The key can also be an ArrayBuffer. The encoding option was
Expand All @@ -2405,6 +2421,7 @@ changes:
* `type`: {string} Must be `'pkcs1'` or `'spki'`. This option is required
only if the `format` is `'der'`.
* `encoding` {string} The string encoding to use when `key` is a string.
* `asymmetricKeyType` {string} The requested asymmetric key type.
* Returns: {KeyObject}
<!--lint enable maximum-line-length remark-lint-->

Expand All @@ -2415,6 +2432,11 @@ otherwise, `key` must be an object with the properties described above.

If the format is `'pem'`, the `'key'` may also be an X.509 certificate.

If the `asymmetricKeyType` is specified, Node.js will attempt to assign the
given type to the key. This can be used, for example, to distinguish between
EC keys on the SM2 curve (`'ec'`) and SM2 keys (`'sm2'`). If the given type
cannot be assigned to the key, the function fails.

Because public keys can be derived from private keys, a private key may be
passed instead of a public key. In that case, this function behaves as if
[`crypto.createPrivateKey()`][] had been called, except that the type of the
Expand Down Expand Up @@ -2555,6 +2577,9 @@ console.log(key.export().toString('hex')); // e89..........41e
<!-- YAML
added: v10.12.0
changes:
- version: REPLACEME
pr-url: ???
description: Add support for SM2.
- version:
- v13.9.0
- v12.17.0
Expand All @@ -2573,7 +2598,7 @@ changes:
-->

* `type`: {string} Must be `'rsa'`, `'dsa'`, `'ec'`, `'ed25519'`, `'ed448'`,
`'x25519'`, `'x448'`, or `'dh'`.
`'x25519'`, `'x448'`, `'dh'`, or `'sm2'`.
* `options`: {Object}
* `modulusLength`: {number} Key size in bits (RSA, DSA).
* `publicExponent`: {number} Public exponent (RSA). **Default:** `0x10001`.
Expand All @@ -2592,7 +2617,7 @@ changes:
* `privateKey`: {string | Buffer | KeyObject}

Generates a new asymmetric key pair of the given `type`. RSA, DSA, EC, Ed25519,
Ed448, X25519, X448, and DH are currently supported.
Ed448, X25519, X448, DH, and SM2 are currently supported.

If a `publicKeyEncoding` or `privateKeyEncoding` was specified, this function
behaves as if [`keyObject.export()`][] had been called on its result. Otherwise,
Expand Down Expand Up @@ -2630,6 +2655,9 @@ a `Promise` for an `Object` with `publicKey` and `privateKey` properties.
<!-- YAML
added: v10.12.0
changes:
- version: REPLACEME
pr-url: ???
description: Add support for SM2.
- version:
- v13.9.0
- v12.17.0
Expand All @@ -2645,7 +2673,7 @@ changes:
-->

* `type`: {string} Must be `'rsa'`, `'dsa'`, `'ec'`, `'ed25519'`, `'ed448'`,
`'x25519'`, `'x448'`, or `'dh'`.
`'x25519'`, `'x448'`, `'dh'`, or `'sm2'`.
* `options`: {Object}
* `modulusLength`: {number} Key size in bits (RSA, DSA).
* `publicExponent`: {number} Public exponent (RSA). **Default:** `0x10001`.
Expand All @@ -2663,7 +2691,7 @@ changes:
* `privateKey`: {string | Buffer | KeyObject}

Generates a new asymmetric key pair of the given `type`. RSA, DSA, EC, Ed25519,
Ed448, X25519, X448, and DH are currently supported.
Ed448, X25519, X448, DH, and SM2 are currently supported.

If a `publicKeyEncoding` or `privateKeyEncoding` was specified, this function
behaves as if [`keyObject.export()`][] had been called on its result. Otherwise,
Expand Down Expand Up @@ -3627,6 +3655,9 @@ Throws an error if FIPS mode is not available.
<!-- YAML
added: v12.0.0
changes:
- version: REPLACEME
pr-url: ???
description: Add support for SM2.
- version:
- v13.2.0
- v12.16.0
Expand All @@ -3643,7 +3674,7 @@ changes:

Calculates and returns the signature for `data` using the given private key and
algorithm. If `algorithm` is `null` or `undefined`, then the algorithm is
dependent upon the key type (especially Ed25519 and Ed448).
dependent upon the key type (especially Ed25519, Ed448, and SM2).

If `key` is not a [`KeyObject`][], this function behaves as if `key` had been
passed to [`crypto.createPrivateKey()`][]. If it is an object, the following
Expand All @@ -3664,6 +3695,9 @@ additional properties can be passed:
`crypto.constants.RSA_PSS_SALTLEN_DIGEST` sets the salt length to the digest
size, `crypto.constants.RSA_PSS_SALTLEN_MAX_SIGN` (default) sets it to the
maximum permissible value.
* `sm2Identifier` {ArrayBuffer|Buffer|TypedArray|DataView} For SM2, this option
specifies the SM2 identifier. The same identifier must be specified during
verification.

### `crypto.timingSafeEqual(a, b)`
<!-- YAML
Expand Down Expand Up @@ -3699,6 +3733,9 @@ not introduce timing vulnerabilities.
<!-- YAML
added: v12.0.0
changes:
- version: REPLACEME
pr-url: ???
description: Add support for SM2.
- version: v15.0.0
pr-url: https://github.com/nodejs/node/pull/35093
description: The data, key, and signature arguments can also be ArrayBuffer.
Expand All @@ -3719,7 +3756,7 @@ changes:

Verifies the given signature for `data` using the given key and algorithm. If
`algorithm` is `null` or `undefined`, then the algorithm is dependent upon the
key type (especially Ed25519 and Ed448).
key type (especially Ed25519, Ed448, and SM2).

If `key` is not a [`KeyObject`][], this function behaves as if `key` had been
passed to [`crypto.createPublicKey()`][]. If it is an object, the following
Expand All @@ -3740,6 +3777,8 @@ additional properties can be passed:
`crypto.constants.RSA_PSS_SALTLEN_DIGEST` sets the salt length to the digest
size, `crypto.constants.RSA_PSS_SALTLEN_MAX_SIGN` (default) sets it to the
maximum permissible value.
* `sm2Identifier` {ArrayBuffer|Buffer|TypedArray|DataView} For SM2, this option
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I'd prefer to make this a more generic name, e.g. just identifier perhaps.

specifies the SM2 identifier.

The `signature` argument is the previously calculated signature for the `data`.

Expand Down
6 changes: 3 additions & 3 deletions lib/internal/crypto/cipher.js
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Expand Up @@ -65,7 +65,7 @@ let StringDecoder;

function rsaFunctionFor(method, defaultPadding, keyType) {
return (options, buffer) => {
const { format, type, data, passphrase } =
const { format, type, data, passphrase, asymmetricKeyType } =
keyType === 'private' ?
preparePrivateKey(options) :
preparePublicOrPrivateKey(options);
Expand All @@ -77,8 +77,8 @@ function rsaFunctionFor(method, defaultPadding, keyType) {
if (oaepLabel !== undefined)
oaepLabel = getArrayBufferOrView(oaepLabel, 'key.oaepLabel', encoding);
buffer = getArrayBufferOrView(buffer, 'buffer', encoding);
return method(data, format, type, passphrase, buffer, padding, oaepHash,
oaepLabel);
return method(data, format, type, passphrase, asymmetricKeyType, buffer,
padding, oaepHash, oaepLabel);
};
}

Expand Down
12 changes: 12 additions & 0 deletions lib/internal/crypto/keygen.js
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Original file line number Diff line number Diff line change
Expand Up @@ -16,8 +16,10 @@ const {
kCryptoJobSync,
kKeyVariantRSA_PSS,
kKeyVariantRSA_SSA_PKCS1_V1_5,
EVP_PKEY_EC,
EVP_PKEY_ED25519,
EVP_PKEY_ED448,
EVP_PKEY_SM2,
EVP_PKEY_X25519,
EVP_PKEY_X448,
OPENSSL_EC_NAMED_CURVE,
Expand Down Expand Up @@ -244,6 +246,16 @@ function createJob(mode, type, options) {
mode,
namedCurve,
paramEncoding,
EVP_PKEY_EC,
...encoding);
}
case 'sm2':
{
return new EcKeyPairGenJob(
mode,
'SM2',
OPENSSL_EC_NAMED_CURVE,
EVP_PKEY_SM2,
...encoding);
}
case 'ed25519':
Expand Down
55 changes: 48 additions & 7 deletions lib/internal/crypto/keys.js
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,16 @@ const {
kKeyEncodingPKCS8,
kKeyEncodingSPKI,
kKeyEncodingSEC1,
EVP_PKEY_DH,
EVP_PKEY_DSA,
EVP_PKEY_EC,
EVP_PKEY_ED25519,
EVP_PKEY_ED448,
EVP_PKEY_RSA,
EVP_PKEY_RSA_PSS,
EVP_PKEY_SM2,
EVP_PKEY_X25519,
EVP_PKEY_X448
} = internalBinding('crypto');

const {
Expand Down Expand Up @@ -359,13 +369,41 @@ function prepareAsymmetricKey(key, ctx) {
// Expect PEM by default, mostly for backward compatibility.
return { format: kKeyFormatPEM, data: getArrayBufferOrView(key, 'key') };
} else if (typeof key === 'object') {
const { key: data, encoding } = key;
const { key: data, encoding, asymmetricKeyType: typeStr } = key;

let asymmetricKeyType;
if (typeStr == null)
asymmetricKeyType = undefined;
else if (typeStr === 'dh')
asymmetricKeyType = EVP_PKEY_DH;
else if (typeStr === 'dsa')
asymmetricKeyType = EVP_PKEY_DSA;
else if (typeStr === 'ec')
asymmetricKeyType = EVP_PKEY_EC;
else if (typeStr === 'ed25519')
asymmetricKeyType = EVP_PKEY_ED25519;
else if (typeStr === 'ed448')
asymmetricKeyType = EVP_PKEY_ED448;
else if (typeStr === 'rsa')
asymmetricKeyType = EVP_PKEY_RSA;
else if (typeStr === 'rsa-pss')
asymmetricKeyType = EVP_PKEY_RSA_PSS;
else if (typeStr === 'sm2')
asymmetricKeyType = EVP_PKEY_SM2;
else if (typeStr === 'x25519')
asymmetricKeyType = EVP_PKEY_X25519;
else if (typeStr === 'x448')
asymmetricKeyType = EVP_PKEY_X448;
else
throw new ERR_INVALID_ARG_VALUE('options.asymmetricKeyType', typeStr);
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A switch statement would be nicer here from a code readability point of view.

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@Mifrill Mifrill Nov 17, 2023 •
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I suggest key-map object instead:

const keyTypeMap = {
  'dh': EVP_PKEY_DH,
  'dsa': EVP_PKEY_DSA,
  'ec': EVP_PKEY_EC,
  'ed25519': EVP_PKEY_ED25519,
  'ed448': EVP_PKEY_ED448,
  'rsa': EVP_PKEY_RSA,
  'rsa-pss': EVP_PKEY_RSA_PSS,
  'sm2': EVP_PKEY_SM2,
  'x25519': EVP_PKEY_X25519,
  'x448': EVP_PKEY_X448,
  null: undefined // Map null to undefined
};
const asymmetricKeyType = keyTypeMap[typeStr];
if (asymmetricKeyType === undefined) { // if asymmetricKeyType null or not in keyTypeMap
  throw new ERR_INVALID_ARG_VALUE('options.asymmetricKeyType', typeStr);
}


// The 'key' property can be a KeyObject as well to allow specifying
// additional options such as padding along with the key.
const common = { asymmetricKeyType };
if (isKeyObject(data))
return { data: getKeyObjectHandle(data, ctx) };
return { data: getKeyObjectHandle(data, ctx), ...common };
else if (isCryptoKey(data))
return { data: getKeyObjectHandle(data[kKeyObject], ctx) };
return { data: getKeyObjectHandle(data[kKeyObject], ctx), ...common };
// Either PEM or DER using PKCS#1 or SPKI.
if (!isStringOrBuffer(data)) {
throw new ERR_INVALID_ARG_TYPE(
Expand All @@ -378,6 +416,7 @@ function prepareAsymmetricKey(key, ctx) {
(ctx === kConsumePrivate || ctx === kCreatePrivate) ? false : undefined;
return {
data: getArrayBufferOrView(data, 'key', encoding),
...common,
...parseKeyEncoding(key, undefined, isPublic)
};
}
Expand Down Expand Up @@ -428,17 +467,19 @@ function createSecretKey(key, encoding) {
}

function createPublicKey(key) {
const { format, type, data } = prepareAsymmetricKey(key, kCreatePublic);
const { format, type, data, passphrase, asymmetricKeyType } =
prepareAsymmetricKey(key, kCreatePublic);
const handle = new KeyObjectHandle();
handle.init(kKeyTypePublic, data, format, type);
handle.init(kKeyTypePublic, data, format, type, passphrase, asymmetricKeyType);
return new PublicKeyObject(handle);
}

function createPrivateKey(key) {
const { format, type, data, passphrase } =
const { format, type, data, passphrase, asymmetricKeyType } =
prepareAsymmetricKey(key, kCreatePrivate);
const handle = new KeyObjectHandle();
handle.init(kKeyTypePrivate, data, format, type, passphrase);
handle.init(kKeyTypePrivate, data, format, type, passphrase,
asymmetricKeyType);
return new PrivateKeyObject(handle);
}

Expand Down
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