fix: incorrect str->bytes->str conversion

Author: Zicchio

pyeudiw/x509/verify.py

@@ -144,10 +144,10 @@ def to_DER_cert(cert: str | bytes) -> bytes:
     if _BASE64_RE.fullmatch(cert_s):
         return B64DER_cert_to_DER_cert(cert_s)
 
-    raise ValueError("unable to recognize input [cert] as a ccertifficate")
+    raise ValueError("unable to recognize input [cert] as a certificate")
 
 
-def to_PEM_cert(cer: str | bytes) -> str:
+def to_PEM_cert(cert: str | bytes) -> str:
     """
     This function takes in a certificate with unknown representation
     (allegedly, PEM, DER or Base64 encoded DER) and applies some
@@ -157,22 +157,28 @@ def to_PEM_cert(cer: str | bytes) -> str:
     use it unless you do NOT hany prior way to know the actual representation
     format of a certificate
     """
-    cert_s = b""
+    cert_b = b""
 
-    if isinstance(cer, str):
-        if is_pem_format(cer):
-            return cer
-        cert_s = cer.encode()
+    if isinstance(cert, str):
+        if is_pem_format(cert):
+            return cert
+        if _BASE64_RE.fullmatch(cert):
+            return B64DER_cert_to_DER_cert(cert)
+        cert_b = cert.encode()
     else:
-        cert_s = cer
+        cert_b = cert
 
-    if cert_s.startswith(b"-----BEGIN CERTIFICATE-----"):
-        return str(cert_s)
+    if cert_b.startswith(b"-----BEGIN CERTIFICATE-----"):
+        return cert_b.decode()
 
-    if _BASE64_RE.fullmatch(str(cert_s)):
-        return B64DER_cert_to_PEM_cert(cert_s)
-    else:
-        return DER_cert_to_PEM_cert(cert_s)
+    try:
+        cert_s = cert_b.decode()
+        if _BASE64_RE.fullmatch(cert_s):
+            return B64DER_cert_to_PEM_cert(cert_s)
+    except UnicodeError:
+        return DER_cert_to_PEM_cert(cert_b)
+
+    raise ValueError("unable to recognize input [cert] as a certificate")
 
 def pem_to_pems_list(cert: str) -> list[str]:
     """