diff --git a/dist/index.d.ts b/dist/index.d.ts
index 4329dbf..c3bd86c 100644
--- a/dist/index.d.ts
+++ b/dist/index.d.ts
@@ -6,8 +6,9 @@
  */
 import * as rdf from '@rdfjs/types';
 import { KeyData, VerificationResult } from './lib/types';
-export { KeyData, VerificationResult, KeyMetadata, Cryptosuites } from './lib/types';
-export { generateKey, KeyDetails } from './lib/crypto_utils';
+export type { KeyData, VerificationResult, KeyMetadata, Cryptosuites } from './lib/types';
+export type { KeyDetails } from './lib/crypto_utils';
+export { generateKey } from './lib/crypto_utils';
 /**
  * Generate a (separate) proof graph (or graphs), per the DI spec. The signature is stored in
  * multibase format, using base64url encoding. Keys are accepted, and stored in JWK format.
diff --git a/dist/index.js b/dist/index.js
index 3fdc692..9930aab 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -6,14 +6,11 @@
  * @packageDocumentation
  */
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.verifyEmbeddedProofGraph = exports.embedProofGraph = exports.verifyProofGraph = exports.generateProofGraph = exports.generateKey = exports.Cryptosuites = void 0;
+exports.verifyEmbeddedProofGraph = exports.embedProofGraph = exports.verifyProofGraph = exports.generateProofGraph = exports.generateKey = void 0;
 const n3 = require("n3");
 const types = require("./lib/types");
 const utils_1 = require("./lib/utils");
 const proof_utils_1 = require("./lib/proof_utils");
-/* This file is also the "top level", so a number of exports are put here to be more friendly to users */
-var types_1 = require("./lib/types");
-Object.defineProperty(exports, "Cryptosuites", { enumerable: true, get: function () { return types_1.Cryptosuites; } });
 var crypto_utils_1 = require("./lib/crypto_utils");
 Object.defineProperty(exports, "generateKey", { enumerable: true, get: function () { return crypto_utils_1.generateKey; } });
 // n3.DataFactory is a namespace with some functions...
diff --git a/dist/lib/crypto_utils.js b/dist/lib/crypto_utils.js
index 447d8f5..bdd35a4 100644
--- a/dist/lib/crypto_utils.js
+++ b/dist/lib/crypto_utils.js
@@ -47,13 +47,6 @@ const RsaAlgs = {
  */
 function algorithmData(report, key) {
     switch (key.kty) {
-        case "EC": {
-            return {
-                name: "ECDSA",
-                namedCurve: key.crv,
-                hash: DEFAULT_HASH
-            };
-        }
         case "RSA": {
             try {
                 return RsaAlgs[key.alg];
@@ -63,6 +56,14 @@ function algorithmData(report, key) {
                 return null;
             }
         }
+        case "EC":
+        default: {
+            return {
+                name: "ECDSA",
+                namedCurve: key.crv,
+                hash: DEFAULT_HASH
+            };
+        }
     }
 }
 /**
@@ -221,13 +222,18 @@ function cryptosuiteId(report, keyPair) {
         return null;
     }
     const alg = algorithmData(report, keyPair.public);
-    switch (alg.name) {
-        case "ECDSA": return types_1.Cryptosuites.ecdsa;
-        case "RSA-PSS": return types_1.Cryptosuites.rsa_pss;
-        case "RSASSA-PKCS1-v1_5": return types_1.Cryptosuites.rsa_ssa;
-        default: {
-            report.errors.push(new types.Invalid_Verification_Method(`Unknown alg (${alg.name} in:\n ${JSON.stringify(keyPair, null, 4)})`));
-            return null;
+    if (alg === null) {
+        return null;
+    }
+    else {
+        switch (alg.name) {
+            case "ECDSA": return types_1.Cryptosuites.ecdsa;
+            case "RSA-PSS": return types_1.Cryptosuites.rsa_pss;
+            case "RSASSA-PKCS1-v1_5": return types_1.Cryptosuites.rsa_ssa;
+            default: {
+                report.errors.push(new types.Invalid_Verification_Method(`Unknown alg (${alg.name} in:\n ${JSON.stringify(keyPair, null, 4)})`));
+                return null;
+            }
         }
     }
 }
diff --git a/dist/lib/proof_utils.js b/dist/lib/proof_utils.js
index 88cfed9..961f9aa 100644
--- a/dist/lib/proof_utils.js
+++ b/dist/lib/proof_utils.js
@@ -76,7 +76,15 @@ async function generateAProofGraph(report, hashValue, keyData) {
             retval.add(quad(keyResource, exports.sec_revoked, literal(keyData.revoked, exports.xsd_datetime)));
         return retval;
     };
-    return createProofGraph(await (0, crypto_utils_1.sign)(report, hashValue, keyData.private));
+    const signature = await (0, crypto_utils_1.sign)(report, hashValue, keyData.private);
+    if (signature === null) {
+        // An error has occurred during signature; details are in the report.
+        // No proof graph is generated
+        return new n3.Store();
+    }
+    else {
+        return createProofGraph(signature);
+    }
 }
 exports.generateAProofGraph = generateAProofGraph;
 ;
@@ -230,6 +238,7 @@ async function verifyAProofGraph(report, hash, proof, proofId) {
  */
 async function verifyProofGraphs(report, hash, proofs) {
     const allErrors = [];
+    // deno-lint-ignore require-await
     const singleVerification = async (pr) => {
         const singleReport = { errors: [], warnings: [] };
         allErrors.push(singleReport);
diff --git a/dist/lib/utils.js b/dist/lib/utils.js
index 208b2cc..8de7ba4 100644
--- a/dist/lib/utils.js
+++ b/dist/lib/utils.js
@@ -106,6 +106,7 @@ exports.DatasetMap = DatasetMap;
  * @param obj
  * @returns
  */
+// deno-lint-ignore no-explicit-any
 function isDatasetCore(obj) {
     return obj.add !== undefined &&
         obj.delete !== undefined &&
@@ -119,6 +120,7 @@ exports.isDatasetCore = isDatasetCore;
  * @param obj
  * @returns
  */
+// deno-lint-ignore no-explicit-any
 function isKeyData(obj) {
     return obj.public !== undefined && obj.private !== undefined;
 }
@@ -180,6 +182,7 @@ function write_quads(dataset) {
     const writer = new n3.Writer({ prefixes: prefixes });
     for (const q of dataset)
         writer.addQuad(q);
-    writer.end((error, result) => console.log(result));
+    // deno-lint-ignore no-explicit-any
+    writer.end((_error, result) => console.log(result));
 }
 exports.write_quads = write_quads;