⚠️ Potential issue | 🔴 Critical

Implementation correctly trims whitespace, but conflicts with PR description and test expectations.

The change to use bufferToString(keyInfo)?.trim() successfully achieves the goal of accepting Base64 inputs with trailing whitespace by trimming before validation. The trimmed keyData is then used in PEM construction (line 73) and normalized via normalizePemFile, which is correct behavior per RFC 7468.

However, there's an inconsistency with:

1. PR description: States "The fix does not trim whitespace for generated PEM output" — but the implementation DOES trim (line 63) and normalizes the output.
2. Test expectations in test/crypto.spec.ts (lines 153-172): Expect trailing spaces to be preserved in the output, but trim() removes them.

The implementation approach (trim input, normalize output) is the correct interpretation of RFC 7468, which advocates for liberal input parsing but strict output formatting. The confusion seems to stem from the PR description and test expectations.

Recommendation: Keep the implementation as-is, but update:

1. The PR description to clarify that trailing whitespace is trimmed from output (not preserved)
2. The test expectations to match the actual behavior (see test file review comments)

Also applies to: 73-73

In src/crypto.ts around line 63 (and related behavior at line 73), the code
trims whitespace from Base64 input which is correct per RFC 7468 but conflicts
with the PR description and tests; keep the implementation as-is (trim input,
normalize output), update the PR description to state that trailing whitespace
is trimmed and not preserved in generated PEM output, and update
test/crypto.spec.ts (tests around lines 153-172) to expect trimmed/normalized
PEM output instead of preserving trailing spaces.

⚠️ Potential issue | 🔴 Critical

Critical: Test expectations don't match the implementation behavior.

These three tests expect trailing spaces to be preserved in the PEM output, but the implementation in src/crypto.ts line 63 calls .trim() on the input, which removes all trailing whitespace (both spaces and newlines).

For example, the first test provides input "QUIK \n" and expects the output to contain "QUIK " (with space) in the PEM body. However, after bufferToString(keyInfo)?.trim() is called, the result will be "QUIK" (no space), so the actual output will be:

-----BEGIN CERTIFICATE-----\nQUIK\n-----END CERTIFICATE-----\n

not:

-----BEGIN CERTIFICATE-----\nQUIK \n-----END CERTIFICATE-----\n

The same issue affects all three tests (lines 153-172). These tests will fail when executed.

To fix this, you need to decide on the correct behavior:

Option 1: If trailing whitespace should be removed (current implementation), update test expectations:

-      it("should allow Base64 without padding but with trailing whitespace", function () {
+      it("should accept Base64 without padding with trailing whitespace (whitespace trimmed)", function () {
         const certificate = keyInfoToPem("QUIK \n", "CERTIFICATE");
         expect(certificate).to.equal(
-          "-----BEGIN CERTIFICATE-----\nQUIK \n-----END CERTIFICATE-----\n",
+          "-----BEGIN CERTIFICATE-----\nQUIK\n-----END CERTIFICATE-----\n",
         );
       });
 
-      it("should allow one Base64 pad with trailing whitespace", function () {
+      it("should accept one Base64 pad with trailing whitespace (whitespace trimmed)", function () {
         const certificate = keyInfoToPem("QQo= \n", "CERTIFICATE");
         expect(certificate).to.equal(
-          "-----BEGIN CERTIFICATE-----\nQQo= \n-----END CERTIFICATE-----\n",
+          "-----BEGIN CERTIFICATE-----\nQQo=\n-----END CERTIFICATE-----\n",
         );
       });
 
-      it("should allow two Base64 pads with trailing whitespace", function () {
+      it("should accept two Base64 pads with trailing whitespace (whitespace trimmed)", function () {
         const certificate = keyInfoToPem("QUJDCg== \n", "CERTIFICATE");
         expect(certificate).to.equal(
-          "-----BEGIN CERTIFICATE-----\nQUJDCg== \n-----END CERTIFICATE-----\n",
+          "-----BEGIN CERTIFICATE-----\nQUJDCg==\n-----END CERTIFICATE-----\n",
         );
       });

Option 2: If trailing whitespace should be preserved (per the test expectations and PR description "does not trim whitespace for generated PEM output"), modify src/crypto.ts line 63 to only trim for validation but preserve the original data for output. However, this would conflict with normalizePemFile which is designed to produce normalized output per RFC 7468.

Based on RFC 7468 and the fact that normalizePemFile is explicitly designed to produce normalized output, Option 1 (trimming whitespace) appears to be the correct approach.