Cryptography Tutorials - Herong's Tutorial Examples - Version 5.36, by Dr. Herong Yang
Signing a Certificate Signing Request
This section provides a tutorial example on how to sign someone else's certificate signing request with your self-signed certificate.
Even though I am not a well established CA, but I can still use OpenSSL to sign somebody else's certificate. The following process shows you how Herong Yang signs John Smith's certificate:
>echo generating a key pair for John >openssl genrsa -out john_rsa.key Loading 'screen' into random state - done Generating RSA private key, 512 bit long modulus ..................++++++++++++ .++++++++++++ e is 65537 (0x10001) >echo generating the certificate signing request for John >openssl req -new -key john_rsa.key -out john.csr -config openssl.cnf You are about to be asked to enter information that will be incorp... into your certificate request. What you are about to enter is what is called a Distinguished Name... There are quite a few fields but you can leave some blank For some fields there will be a default value, If you enter '.', the field will be left blank. ----- Country Name (2 letter code) []:CN State or Province Name (full name) []:PN Locality Name (eg, city) []:LN Organization Name (eg, company) []:ON Organizational Unit Name (eg, section) []:UN Common Name (eg, YOUR name) []:John Smith Email Address []:. Please enter the following 'extra' attributes to be sent with your certificate request A challenge password []:. An optional company name []:. >echo signing John's request with Herong's certificate and key >openssl x509 -req -in john.csr -CA herong.crt -CAkey herong_rsa_des.key -out john.crt Loading 'screen' into random state - done Signature ok subject=/C=CN/ST=PN/L=LN/O=ON/OU=UN/CN=John Smith Getting CA Private Key Enter pass phrase for herong_rsa_des.key: >echo looking at John's certificate >openssl x509 -in john.crt -noout -text Certificate: Data: Version: 1 (0x0) Serial Number: 5 (0x5) Signature Algorithm: md5WithRSAEncryption Issuer: C=CN, ST=PN, L=CN, O=ON, OU=UN, CN=Herong Yang Validity Not Before: Jul 17 03:10:39 2002 GMT Not After : Aug 16 03:10:39 2002 GMT Subject: C=CN, ST=PN, L=LN, O=ON, OU=UN, CN=John Smith Subject Public Key Info: Public Key Algorithm: rsaEncryption RSA Public Key: (512 bit) Modulus (512 bit): 00:d4:a4:be:ce:2d:be:88:56:ef:d3:de:13:15:33: 59:84:ea:08:fe:bc:c8:70:93:30:c0:c4:c5:de:e3: 65:e8:98:e1:15:12:27:d4:00:69:6e:22:fa:c3:72: 4a:75:a6:d8:66:dc:ec:12:f6:92:94:09:3c:3a:61: 69:47:99:b3:91 Exponent: 65537 (0x10001) Signature Algorithm: md5WithRSAEncryption 57:a5:9f:93:8e:f8:69:cd:9b:70:ff:f5:fc:78:e3:f6:da:70: b9:5d:d6:a8:ac:ae:76:41:13:04:99:28:97:55:9b:5e:94:c7: c5:59:26:77:33:cb:67:aa:1c:d5:0e:b7:de:33:73:b1:f6:3a: 0b:c2:d9:6a:5b:f1:d1:ab:60:9b
This is nice. Now I can sign anyone's certificate, and become a CA! All I need is my RSA key pair, herong_rsa_des.key, my self-signed certificate, herong.crt, and the "x509" command.
Last update: 2013.
Table of Contents
Introduction to AES (Advanced Encryption Standard)
DES Algorithm - Illustrated with Java Programs
DES Algorithm Java Implementation
DES Algorithm - Java Implementation in JDK JCE
DES Encryption Operation Modes
PHP Implementation of DES - mcrypt
Blowfish - 8-Byte Block Cipher
Secret Key Generation and Management
Cipher - Secret Key Encryption and Decryption
RSA Implementation using java.math.BigInteger Class
Introduction of DSA (Digital Signature Algorithm)
Java Default Implementation of DSA
Private key and Public Key Pair Generation
PKCS#8/X.509 Private/Public Encoding Standards
Cipher - Public Key Encryption and Decryption
OpenSSL Introduction and Installation
OpenSSL Generating and Managing RSA Keys
►OpenSSL Generating and Signing CSR
Why Certificates Need to Be Signed by CA?
Generating Certificate Signing Request (CSR)
Viewing Components of Certificate Signing Request
►Signing a Certificate Signing Request
OpenSSL Validating Certificate Path
"keytool" and "keystore" from JDK
"OpenSSL" Signing CSR Generated by "keytool"
Migrating Keys from "keystore" to "OpenSSL" Key Files
Certificate X.509 Standard and DER/PEM Formats
Migrating Keys from "OpenSSL" Key Files to "keystore"
Using Certificates in IE (Internet Explorer)