crypto: add support for RSA-PSS keys

This commit adds support for RSA-PSS keys, including
- KeyObjects of type rsa-pss,
- key pair generation for RSA-PSS, and
- signing and verification using RSA-PSS keys.

PR-URL: #26960
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>

Author: tniessen

doc/api/crypto.md

@@ -1129,6 +1129,9 @@ passing keys as strings or `Buffer`s due to improved security features.
 <!-- YAML
 added: v11.6.0
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/26960
+    description: Added support for `'rsa-pss'`
   - version: REPLACEME
     pr-url: https://github.com/nodejs/node/pull/26786
     description: This property now returns `undefined` for KeyObject
@@ -1142,8 +1145,18 @@ changes:
 -->
 * {string}
 
-For asymmetric keys, this property represents the type of the embedded key
-(`'rsa'`, `'dsa'`, `'ec'`, `'ed25519'`, `'ed448'`, `'x25519'` or `'x448'`).
+For asymmetric keys, this property represents the type of the key. Supported key
+types are:
+
+* `'rsa'` (OID 1.2.840.113549.1.1.1)
+* `'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)
+* `'x25519'` (OID 1.3.101.110)
+* `'x448'` (OID 1.3.101.111)
+* `'ed25519'` (OID 1.3.101.112)
+* `'ed448'` (OID 1.3.101.113)
+
 This property is `undefined` for unrecognized `KeyObject` types and symmetric
 keys.
 
@@ -1271,6 +1284,9 @@ console.log(verify.verify(publicKey, signature));
 <!-- YAML
 added: v0.1.92
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/26960
+    description: This function now supports RSA-PSS keys.
   - version: v11.6.0
     pr-url: https://github.com/nodejs/node/pull/24234
     description: This function now supports key objects.
@@ -1296,7 +1312,9 @@ object, the following additional properties can be passed:
   * `crypto.constants.RSA_PKCS1_PSS_PADDING`
 
   Note that `RSA_PKCS1_PSS_PADDING` will use MGF1 with the same hash function
-  used to sign the message as specified in section 3.1 of [RFC 4055][].
+  used to sign the message as specified in section 3.1 of [RFC 4055][], unless
+  an MGF1 hash function has been specified as part of the key in compliance with
+  section 3.3 of [RFC 4055][].
 * `saltLength`: {integer} - salt length for when padding is
   `RSA_PKCS1_PSS_PADDING`. The special value
   `crypto.constants.RSA_PSS_SALTLEN_DIGEST` sets the salt length to the digest
@@ -1369,6 +1387,9 @@ This can be called many times with new data as it is streamed.
 <!-- YAML
 added: v0.1.92
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/26960
+    description: This function now supports RSA-PSS keys.
   - version: v11.7.0
     pr-url: https://github.com/nodejs/node/pull/25217
     description: The key can now be a private key.
@@ -1395,7 +1416,9 @@ object, the following additional properties can be passed:
   * `crypto.constants.RSA_PKCS1_PSS_PADDING`
 
   Note that `RSA_PKCS1_PSS_PADDING` will use MGF1 with the same hash function
-  used to verify the message as specified in section 3.1 of [RFC 4055][].
+  used to verify the message as specified in section 3.1 of [RFC 4055][], unless
+  an MGF1 hash function has been specified as part of the key in compliance with
+  section 3.3 of [RFC 4055][].
 * `saltLength`: {integer} - salt length for when padding is
   `RSA_PKCS1_PSS_PADDING`. The special value
   `crypto.constants.RSA_PSS_SALTLEN_DIGEST` sets the salt length to the digest

lib/internal/crypto/keygen.js

@@ -3,6 +3,7 @@
 const { AsyncWrap, Providers } = internalBinding('async_wrap');
 const {
   generateKeyPairRSA,
+  generateKeyPairRSAPSS,
   generateKeyPairDSA,
   generateKeyPairEC,
   generateKeyPairNid,
@@ -141,6 +142,7 @@ function check(type, options, callback) {
   let impl;
   switch (type) {
     case 'rsa':
+    case 'rsa-pss':
       {
         const { modulusLength } = needOptions();
         if (!isUint32(modulusLength))
@@ -153,10 +155,27 @@ function check(type, options, callback) {
           throw new ERR_INVALID_OPT_VALUE('publicExponent', publicExponent);
         }
 
-        impl = (wrap) => generateKeyPairRSA(modulusLength, publicExponent,
-                                            publicFormat, publicType,
-                                            privateFormat, privateType,
-                                            cipher, passphrase, wrap);
+        if (type === 'rsa') {
+          impl = (wrap) => generateKeyPairRSA(modulusLength, publicExponent,
+                                              publicFormat, publicType,
+                                              privateFormat, privateType,
+                                              cipher, passphrase, wrap);
+          break;
+        }
+
+        const { hash, mgf1Hash, saltLength } = options;
+        if (hash !== undefined && typeof hash !== 'string')
+          throw new ERR_INVALID_OPT_VALUE('hash', hash);
+        if (mgf1Hash !== undefined && typeof mgf1Hash !== 'string')
+          throw new ERR_INVALID_OPT_VALUE('mgf1Hash', mgf1Hash);
+        if (saltLength !== undefined && !isUint32(saltLength))
+          throw new ERR_INVALID_OPT_VALUE('saltLength', saltLength);
+
+        impl = (wrap) => generateKeyPairRSAPSS(modulusLength, publicExponent,
+                                               hash, mgf1Hash, saltLength,
+                                               publicFormat, publicType,
+                                               privateFormat, privateType,
+                                               cipher, passphrase, wrap);
       }
       break;
     case 'dsa':
@@ -225,8 +244,7 @@ function check(type, options, callback) {
       break;
     default:
       throw new ERR_INVALID_ARG_VALUE('type', type,
-                                      "must be one of 'rsa', 'dsa', 'ec', " +
-                                      "'ed25519', 'ed448', 'x25519', 'x448'");
+                                      'must be a supported key type');
   }
 
   if (options) {

lib/internal/crypto/sig.js

@@ -12,10 +12,6 @@ const {
   signOneShot: _signOneShot,
   verifyOneShot: _verifyOneShot
 } = internalBinding('crypto');
-const {
-  RSA_PSS_SALTLEN_AUTO,
-  RSA_PKCS1_PADDING
-} = internalBinding('constants').crypto;
 const {
   getDefaultEncoding,
   kHandle,
@@ -56,14 +52,14 @@ Sign.prototype.update = function update(data, encoding) {
 };
 
 function getPadding(options) {
-  return getIntOption('padding', RSA_PKCS1_PADDING, options);
+  return getIntOption('padding', options);
 }
 
 function getSaltLength(options) {
-  return getIntOption('saltLength', RSA_PSS_SALTLEN_AUTO, options);
+  return getIntOption('saltLength', options);
 }
 
-function getIntOption(name, defaultValue, options) {
+function getIntOption(name, options) {
   const value = options[name];
   if (value !== undefined) {
     if (value === value >> 0) {
@@ -72,7 +68,7 @@ function getIntOption(name, defaultValue, options) {
       throw new ERR_INVALID_OPT_VALUE(name, value);
     }
   }
-  return defaultValue;
+  return undefined;
 }
 
 Sign.prototype.sign = function sign(options, encoding) {

src/env.h

@@ -161,6 +161,7 @@ constexpr size_t kFsStatsBufferLength = kFsStatsFieldsNumber * 2;
   V(crypto_x25519_string, "x25519")                                            \
   V(crypto_x448_string, "x448")                                                \
   V(crypto_rsa_string, "rsa")                                                  \
+  V(crypto_rsa_pss_string, "rsa-pss")                                          \
   V(cwd_string, "cwd")                                                         \
   V(data_string, "data")                                                       \
   V(dest_string, "dest")                                                       \