Add configurable key length with 4096-bit default

- Added key_bits parameter to configuration (default: 4096)
- Updated generate-csr.sh to accept key length as 8th parameter
- Updated cert-manager.py to prompt for key length
- Key length shown in summary and output
- Supports common key sizes: 2048, 4096, 8192 bits

cert-manager.py

@@ -20,6 +20,7 @@ DEFAULT_CONFIG = {
     'organizational_unit': 'it',
     'ca_server': '10.0.0.21',
     'validity_days': '3650',
+    'key_bits': '4096',
     'last_target_host': '',
     'last_common_name': ''
 }
@@ -85,6 +86,7 @@ def main():
             config['organizational_unit'] = prompt_with_default("Organizational Unit (OU)", config['organizational_unit'])
             config['ca_server'] = prompt_with_default("CA Server", config['ca_server'])
             config['validity_days'] = prompt_with_default("Validity (days)", config['validity_days'])
+            config['key_bits'] = prompt_with_default("Key Length (bits)", config['key_bits'])
             print()
     
     # Get certificate details
@@ -112,6 +114,7 @@ def main():
     organization = prompt_with_default("Organization (O)", config['organization'])
     org_unit = prompt_with_default("Organizational Unit (OU)", config['organizational_unit'])
     validity_days = prompt_with_default("Validity (days)", config['validity_days'])
+    key_bits = prompt_with_default("Key Length (bits)", config['key_bits'])
     
     print("\n" + "=" * 60)
     print("Summary:")
@@ -123,6 +126,7 @@ def main():
     print(f"Locality:        {locality}")
     print(f"Organization:    {organization}")
     print(f"Org Unit:        {org_unit}")
+    print(f"Key Length:      {key_bits} bits")
     print(f"Validity:        {validity_days} days")
     print(f"CA Server:       {config['ca_server']}")
     print(f"Output files:    {short_name}.req, {short_name}-cert.pem")
@@ -154,7 +158,8 @@ def main():
         state,
         locality,
         organization,
-        org_unit
+        org_unit,
+        key_bits
     ]
     
     try:
@@ -210,7 +215,7 @@ def main():
     print(f"  - {req_file} (Certificate Request)")
     print(f"  - {cert_file} (Signed Certificate)")
     print(f"\nOn target host ({target_host}):")
-    print(f"  - /tmp/{short_name}.key (Private Key)")
+    print(f"  - /tmp/{short_name}.key (Private Key - {key_bits} bits)")
     print(f"  - /tmp/{short_name}.crt (Certificate)")
     print("\n")