1 files changed, 66 insertions, 0 deletions
diff --git a/backend/node_modules/jsonwebtoken/lib/validateAsymmetricKey.js b/backend/node_modules/jsonwebtoken/lib/validateAsymmetricKey.js
new file mode 100644
index 0000000..c10340b
--- /dev/null
+++ b/backend/node_modules/jsonwebtoken/lib/validateAsymmetricKey.js
@@ -0,0 +1,66 @@
+const ASYMMETRIC_KEY_DETAILS_SUPPORTED = require('./asymmetricKeyDetailsSupported');
+const RSA_PSS_KEY_DETAILS_SUPPORTED = require('./rsaPssKeyDetailsSupported');
+
+const allowedAlgorithmsForKeys = {
+  'ec': ['ES256', 'ES384', 'ES512'],
+  'rsa': ['RS256', 'PS256', 'RS384', 'PS384', 'RS512', 'PS512'],
+  'rsa-pss': ['PS256', 'PS384', 'PS512']
+};
+
+const allowedCurves = {
+  ES256: 'prime256v1',
+  ES384: 'secp384r1',
+  ES512: 'secp521r1',
+};
+
+module.exports = function(algorithm, key) {
+  if (!algorithm || !key) return;
+
+  const keyType = key.asymmetricKeyType;
+  if (!keyType) return;
+
+  const allowedAlgorithms = allowedAlgorithmsForKeys[keyType];
+
+  if (!allowedAlgorithms) {
+    throw new Error(`Unknown key type "${keyType}".`);
+  }
+
+  if (!allowedAlgorithms.includes(algorithm)) {
+    throw new Error(`"alg" parameter for "${keyType}" key type must be one of: ${allowedAlgorithms.join(', ')}.`)
+  }
+
+  /*
+   * Ignore the next block from test coverage because it gets executed
+   * conditionally depending on the Node version. Not ignoring it would
+   * prevent us from reaching the target % of coverage for versions of
+   * Node under 15.7.0.
+   */
+  /* istanbul ignore next */
+  if (ASYMMETRIC_KEY_DETAILS_SUPPORTED) {
+    switch (keyType) {
+    case 'ec':
+      const keyCurve = key.asymmetricKeyDetails.namedCurve;
+      const allowedCurve = allowedCurves[algorithm];
+
+      if (keyCurve !== allowedCurve) {
+        throw new Error(`"alg" parameter "${algorithm}" requires curve "${allowedCurve}".`);
+      }
+      break;
+
+    case 'rsa-pss':
+      if (RSA_PSS_KEY_DETAILS_SUPPORTED) {
+        const length = parseInt(algorithm.slice(-3), 10);
+        const { hashAlgorithm, mgf1HashAlgorithm, saltLength } = key.asymmetricKeyDetails;
+
+        if (hashAlgorithm !== `sha${length}` || mgf1HashAlgorithm !== hashAlgorithm) {
+          throw new Error(`Invalid key for this operation, its RSA-PSS parameters do not meet the requirements of "alg" ${algorithm}.`);
+        }
+
+        if (saltLength !== undefined && saltLength > length >> 3) {
+          throw new Error(`Invalid key for this operation, its RSA-PSS parameter saltLength does not meet the requirements of "alg" ${algorithm}.`)
+        }
+      }
+      break;
+    }
+  }
+}