OpenSSL "ans1parse" - Configuration File for RSA Public Key

Q

Can I build an RSA public key from an OpenSSL configuration file?

✍: FYIcenter.com

A

Yes, you can build an RSA public key from an OpenSSL configuration file, if you know the components of the key, as shown in the test below:

C:\Users\fyicenter>type asn1_rsa_pub_key.cnf
asn1 = SEQUENCE:rsa_pub_key

[rsa_pub_key]
algorithm =SEQUENCE:rsa_alg
pubkey    =BITWRAP,SEQUENCE:rsa_pub_components

[rsa_alg]
algorithm =OID:rsaEncryption
parameter =NULL

[rsa_pub_components]
n         =INTEGER:0xBB6FE79432CC6EA2D8F970675A5A87BFBE1AFF0BE63E879F2AF\
FB93644D4D2C6D000430DEC66ABF47829E74B8C5108623A1C0EE8BE217B3AD8D36D5EB4FCA1D9
e         =INTEGER:0x010001


C:\Users\fyicenter>\local\openssl\openssl 
   asn1parse -genconf asn1_rsa_pub_key.cnf -noout -out rsa_pub_key.der

C:\Users\fyicenter>\local\openssl\openssl 
   pkey -pubin -in rsa_pub_key.der -inform DER -text -noout
Public-Key: (512 bit)
Modulus:
    00:bb:6f:e7:94:32:cc:6e:a2:d8:f9:70:67:5a:5a:
    87:bf:be:1a:ff:0b:e6:3e:87:9f:2a:ff:b9:36:44:
    d4:d2:c6:d0:00:43:0d:ec:66:ab:f4:78:29:e7:4b:
    8c:51:08:62:3a:1c:0e:e8:be:21:7b:3a:d8:d3:6d:
    5e:b4:fc:a1:d9
Exponent: 65537 (0x10001)

 

OpenSSL "ans1parse" - DSA Private Key in ASN.1 Structure

OpenSSL "ans1parse" - RSA Public Key in ASN.1 Structure

OpenSSL "ans1parse" Command

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2016-09-27, 4695👍, 0💬