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crypto: add sign/verify support for RSASSA-PSS · nodejs/node@a7d4cad · GitHub

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tniessen
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MylesBorins
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crypto: add sign/verify support for RSASSA-PSS
Adds support for the PSS padding scheme. Until now, the sign/verify functions used the old EVP_Sign*/EVP_Verify* OpenSSL API, making it impossible to change the padding scheme. Fixed by first computing the message digest and then signing/verifying with a custom EVP_PKEY_CTX, allowing us to specify options such as the padding scheme and the PSS salt length. Fixes: #1127 PR-URL: #11705 Reviewed-By: Shigeki Ohtsu <ohtsu@ohtsu.org> Reviewed-By: Sam Roberts <vieuxtech@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Anna Henningsen <anna@addaleax.net>
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8 files changed

Lines changed: 537 additions & 18 deletions

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‎doc/api/crypto.md‎

Lines changed: 57 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -898,17 +898,32 @@ console.log(sign.sign(privateKey).toString('hex'));
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### sign.sign(private_key[, output_format])
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<!-- YAML
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added: v0.1.92
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changes:
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- version: REPLACEME
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pr-url: https://github.com/nodejs/node/pull/11705
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description: Support for RSASSA-PSS and additional options was added.
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-->
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Calculates the signature on all the data passed through using either
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[`sign.update()`][] or [`sign.write()`][stream-writable-write].
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The `private_key` argument can be an object or a string. If `private_key` is a
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string, it is treated as a raw key with no passphrase. If `private_key` is an
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object, it is interpreted as a hash containing two properties:
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object, it must contain one or more of the following properties:
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* `key`: {string} - PEM encoded private key
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* `key`: {string} - PEM encoded private key (required)
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* `passphrase`: {string} - passphrase for the private key
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* `padding`: {integer} - Optional padding value for RSA, one of the following:
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* `crypto.constants.RSA_PKCS1_PADDING` (default)
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* `crypto.constants.RSA_PKCS1_PSS_PADDING`
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Note that `RSA_PKCS1_PSS_PADDING` will use MGF1 with the same hash function
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used to sign the message as specified in section 3.1 of [RFC 4055][].
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* `saltLength`: {integer} - salt length for when padding is
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`RSA_PKCS1_PSS_PADDING`. The special value
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`crypto.constants.RSA_PSS_SALTLEN_DIGEST` sets the salt length to the digest
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size, `crypto.constants.RSA_PSS_SALTLEN_MAX_SIGN` (default) sets it to the
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maximum permissible value.
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The `output_format` can specify one of `'latin1'`, `'hex'` or `'base64'`. If
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`output_format` is provided a string is returned; otherwise a [`Buffer`][] is
@@ -991,11 +1006,33 @@ This can be called many times with new data as it is streamed.
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### verifier.verify(object, signature[, signature_format])
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<!-- YAML
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added: v0.1.92
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changes:
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- version: REPLACEME
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pr-url: https://github.com/nodejs/node/pull/11705
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description: Support for RSASSA-PSS and additional options was added.
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-->
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- `object` {string | Object}
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- `signature` {string | Buffer | Uint8Array}
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- `signature_format` {string}
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Verifies the provided data using the given `object` and `signature`.
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The `object` argument is a string containing a PEM encoded object, which can be
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one an RSA public key, a DSA public key, or an X.509 certificate.
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The `object` argument can be either a string containing a PEM encoded object,
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which can be an RSA public key, a DSA public key, or an X.509 certificate,
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or an object with one or more of the following properties:
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* `key`: {string} - PEM encoded public key (required)
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* `padding`: {integer} - Optional padding value for RSA, one of the following:
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* `crypto.constants.RSA_PKCS1_PADDING` (default)
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* `crypto.constants.RSA_PKCS1_PSS_PADDING`
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Note that `RSA_PKCS1_PSS_PADDING` will use MGF1 with the same hash function
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used to verify the message as specified in section 3.1 of [RFC 4055][].
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* `saltLength`: {integer} - salt length for when padding is
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`RSA_PKCS1_PSS_PADDING`. The special value
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`crypto.constants.RSA_PSS_SALTLEN_DIGEST` sets the salt length to the digest
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size, `crypto.constants.RSA_PSS_SALTLEN_AUTO` (default) causes it to be
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determined automatically.
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The `signature` argument is the previously calculated signature for the data, in
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the `signature_format` which can be `'latin1'`, `'hex'` or `'base64'`.
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If a `signature_format` is specified, the `signature` is expected to be a
@@ -1902,6 +1939,21 @@ the `crypto`, `tls`, and `https` modules and are generally specific to OpenSSL.
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<td><code>RSA_PKCS1_PSS_PADDING</code></td>
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<td></td>
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</tr>
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<tr>
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<td><code>RSA_PSS_SALTLEN_DIGEST</code></td>
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<td>Sets the salt length for `RSA_PKCS1_PSS_PADDING` to the digest size
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when signing or verifying.</td>
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</tr>
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<tr>
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<td><code>RSA_PSS_SALTLEN_MAX_SIGN</code></td>
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<td>Sets the salt length for `RSA_PKCS1_PSS_PADDING` to the maximum
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permissible value when signing data.</td>
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</tr>
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<tr>
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<td><code>RSA_PSS_SALTLEN_AUTO</code></td>
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<td>Causes the salt length for `RSA_PKCS1_PSS_PADDING` to be determined
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automatically when verifying a signature.</td>
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</tr>
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<tr>
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<td><code>POINT_CONVERSION_COMPRESSED</code></td>
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<td></td>
@@ -1977,6 +2029,7 @@ the `crypto`, `tls`, and `https` modules and are generally specific to OpenSSL.
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[publicly trusted list of CAs]: https://mxr.mozilla.org/mozilla/source/security/nss/lib/ckfw/builtins/certdata.txt
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[RFC 2412]: https://www.rfc-editor.org/rfc/rfc2412.txt
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[RFC 3526]: https://www.rfc-editor.org/rfc/rfc3526.txt
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[RFC 4055]: https://www.rfc-editor.org/rfc/rfc4055.txt
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[stream]: stream.html
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[stream-writable-write]: stream.html#stream_writable_write_chunk_encoding_callback
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[Crypto Constants]: #crypto_crypto_constants_1

‎lib/crypto.js‎

Lines changed: 46 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -283,7 +283,28 @@ Sign.prototype.sign = function sign(options, encoding) {
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var key = options.key || options;
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var passphrase = options.passphrase || null;
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var ret = this._handle.sign(toBuf(key), null, passphrase);
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// Options specific to RSA
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var rsaPadding = constants.RSA_PKCS1_PADDING;
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if (options.hasOwnProperty('padding')) {
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if (options.padding === options.padding >> 0) {
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rsaPadding = options.padding;
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} else {
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throw new TypeError('padding must be an integer');
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}
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}
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var pssSaltLength = constants.RSA_PSS_SALTLEN_AUTO;
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if (options.hasOwnProperty('saltLength')) {
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if (options.saltLength === options.saltLength >> 0) {
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pssSaltLength = options.saltLength;
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} else {
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throw new TypeError('saltLength must be an integer');
303+
}
304+
}
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306+
var ret = this._handle.sign(toBuf(key), null, passphrase, rsaPadding,
307+
pssSaltLength);
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288309
encoding = encoding || exports.DEFAULT_ENCODING;
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if (encoding && encoding !== 'buffer')
@@ -309,9 +330,31 @@ util.inherits(Verify, stream.Writable);
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Verify.prototype._write = Sign.prototype._write;
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Verify.prototype.update = Sign.prototype.update;
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312-
Verify.prototype.verify = function verify(object, signature, sigEncoding) {
333+
Verify.prototype.verify = function verify(options, signature, sigEncoding) {
334+
var key = options.key || options;
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sigEncoding = sigEncoding || exports.DEFAULT_ENCODING;
314-
return this._handle.verify(toBuf(object), toBuf(signature, sigEncoding));
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// Options specific to RSA
338+
var rsaPadding = constants.RSA_PKCS1_PADDING;
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if (options.hasOwnProperty('padding')) {
340+
if (options.padding === options.padding >> 0) {
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rsaPadding = options.padding;
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} else {
343+
throw new TypeError('padding must be an integer');
344+
}
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}
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347+
var pssSaltLength = constants.RSA_PSS_SALTLEN_AUTO;
348+
if (options.hasOwnProperty('saltLength')) {
349+
if (options.saltLength === options.saltLength >> 0) {
350+
pssSaltLength = options.saltLength;
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} else {
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throw new TypeError('saltLength must be an integer');
353+
}
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}
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return this._handle.verify(toBuf(key), toBuf(signature, sigEncoding), null,
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rsaPadding, pssSaltLength);
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};
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function rsaPublic(method, defaultPadding) {

‎src/node_constants.cc‎

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@@ -974,6 +974,18 @@ void DefineOpenSSLConstants(Local<Object> target) {
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NODE_DEFINE_CONSTANT(target, RSA_PKCS1_PSS_PADDING);
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#endif
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#ifdef RSA_PSS_SALTLEN_DIGEST
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NODE_DEFINE_CONSTANT(target, RSA_PSS_SALTLEN_DIGEST);
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#endif
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#ifdef RSA_PSS_SALTLEN_MAX_SIGN
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NODE_DEFINE_CONSTANT(target, RSA_PSS_SALTLEN_MAX_SIGN);
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#endif
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#ifdef RSA_PSS_SALTLEN_AUTO
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NODE_DEFINE_CONSTANT(target, RSA_PSS_SALTLEN_AUTO);
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#endif
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#if HAVE_OPENSSL
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// NOTE: These are not defines
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NODE_DEFINE_CONSTANT(target, POINT_CONVERSION_COMPRESSED);

‎src/node_constants.h‎

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@@ -7,6 +7,19 @@
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#include "v8.h"
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#if HAVE_OPENSSL
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#ifndef RSA_PSS_SALTLEN_DIGEST
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#define RSA_PSS_SALTLEN_DIGEST -1
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#endif
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#ifndef RSA_PSS_SALTLEN_MAX_SIGN
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#define RSA_PSS_SALTLEN_MAX_SIGN -2
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#endif
18+
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#ifndef RSA_PSS_SALTLEN_AUTO
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#define RSA_PSS_SALTLEN_AUTO -2
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#endif
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#define DEFAULT_CIPHER_LIST_CORE "ECDHE-RSA-AES128-GCM-SHA256:" \
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"ECDHE-ECDSA-AES128-GCM-SHA256:" \
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"ECDHE-RSA-AES256-GCM-SHA384:" \

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