SSL RSA

SSL RSA is a cryptographic library that implements openssl standard commands, message digest commands and cipher commands from scratch.

How to compile

From the root of the repository run make

How to run

After compiling, from the root repository run ./ft_ssl [command] [options].

Standard

Commands

• genrsa: generates an RSA private key
• rsa: processes RSA keys
• rsautl: can be used to sign, verify, encrypt and decrypt data using the RSA algorithm
• gendsa: generates a DSA private key
• gendes: generates a DES key

Options

ft_ssl rsa [-inform PEM] [-outform PEM] [-in file] [-passin arg] [-out file] [-passout arg] [-des] [-text] [-noout] [-modulus] [-check] [-pubin] [-pubout]
ft_ssl rsautl [-in file] [-out file] [-inkey file] [-pubin] [-encrypt] [-decrypt] [-hexdump]
genrsa, gendsa, gendes:
-i : input file
-o : output file

Examples

$ ./ft_ssl genrsa -o private_key.pem
Generating RSA private key, 64 bit long modulus
.+++++++++++++++++++++++++++
.+++++++++++++++++++++++++++
e is 65537 (0x10001)

$ cat private_key.pem
-----BEGIN RSA PRIVATE KEY-----
MD8CAQACCQDtxqVw8Ptc0QIDAQABAggaaS+0AoHXDwIFAP7aDVcCBQDu2OYXAgUA
91y4UwIEcau8ZQIFAMguv20=
-----END RSA PRIVATE KEY-----

$ ./ft_ssl rsa -in "private_key.pem" -pubout > public_key.pem
writing RSA key

$ cat public_key.pem
-----BEGIN PUBLIC KEY-----
MCQwDQYJKoZIhvcNAQEBBQADEwAwEAIJAO3GpXDw+1zRAgMBAAE=
-----END PUBLIC KEY-----

$ ./ft_ssl rsautl -pubin -inkey public_key.pem -out encrypt.rsa -encrypt
Alice

$ ./ft_ssl rsautl -inkey private_key.pem -in encrypt.rsa  -decrypt
Alice

Message Digest

Commands

• md5
• sha224
• sha256
• sha384
• sha512

Options

-p : echo STDIN to STDOUT and append the checksum to STDOUT
-q : quiet mode
-r : reverse the format of the output
-s : print the sum of the given string

Examples

$ echo -n "Bob" | ./ft_ssl sha256
cd9fb1e148ccd8442e5aa74904cc73bf6fb54d1d54d333bd596aa9bb4bb4e961

$ echo -n "Bob" | ./ft_ssl md5
2fc1c0beb992cd7096975cfebf9d5c3b

Cipher

Commands

• base64
• des
• des-ecb
• des-cbc
• des_pcbc
• des-cfb
• des-ofb
• des3
• des3-ecb
• des3-cbc
• des3_pcbc
• des3-cfb
• des3-ofb

Options

-d : decode mode
-e : encode mode (default)
-i : input file
-o : output file
des only:
-a : decode/encode the input/output in base64
-k : key in hex is the next argument
-p : password in ascii is the next argument
-s : the salt in hex is the next argument
-v : initialization vector in hex is the next argument

Examples

$ echo "Alice's Secret" | ./ft_ssl base64
QWxpY2UncyBTZWNyZXQK

$ echo "QWxpY2UncyBTZWNyZXQK" | ./ft_ssl base64 -d
Alice's Secret

$ echo -n "Alice's Secret" | ./ft_ssl des -s "A128BE98" -o "encrypted.des"
enter encryption password:

$ hexdump encrypted.des
0000000 9d01 1da4 2ee0 e7a3 2430 7545 bcd4 4dd1
0000010

$ ./ft_ssl des -d -s "A128BE98" -i encrypted.des
enter encryption password:
Alice's Secret