Crypt::CBC Encryption Verification

A tutorial example is provided to verify Crypt::CBC against the Blowfish CBC test vector published at www.schneier.com.

Okay, I think we have learned enough on how to use the Crypt::CBC module. Now we needed to verify its output against existing Blowfish CBC test vectors.

When I search the Internet, I only see one published test vector for Blowfish in CBC mode at https://www.schneier.com/code/vectors.txt:

chaining mode test data
key[16]   = 0123456789ABCDEFF0E1D2C3B4A59687
iv[8]     = FEDCBA9876543210
data[29]  = "7654321 Now is the time for " (includes trailing '\0')
data[29]  = 37363534333231204E6F77206973207468652074696D6520666F722000
cbc cipher text
cipher[32]= 
   6B77B4D63006DEE605B156E27403979358DEB9E7154616D959F1652BD5FF92CC

I think we can run my example script, Crypt-CBC-Blowfish-Cipher-Object.pl, to validate this:

C:\herong>perl Crypt-CBC-Blowfish-Cipher-Object.pl 
   0123456789ABCDEFF0E1D2C3B4A59687 FEDCBA9876543210 
   37363534333231204E6F77206973207468652074696D6520666F722000000000
Crypt::CBC Blowfish Object Test - output in Hex:
   Secret Key     (0123456789ABCDEFF0E1D2C3B4A59687)
   IV             (FEDCBA9876543210)
   Plaintext      (37363534333231204E6F772069732074
                   68652074696D6520666F722000000000)
Creating Crypt::CBC with Blowfish Object ...
Encrypting plaintext...
   Ciphertext     (6b77b4d63006dee605b156e274039793
                   58deb9e7154616d959f1652bd5ff92cc)
Decrypting ciphertext...
   Decrypted text (37363534333231204e6f772069732074
                   68652074696d6520666f722000000000)
   Pass Phrase    ()
   IV             (fedcba9876543210)

Congratulations! The ciphertext matches with what given in the test vector. Now we can confidently say that Crypt::CBC and Crypt::Blowfish modules work correctly.

Last update: 2015.

Table of Contents

 About This Book

 Blowfish Cipher Algorithm

 Perl Crypt::Blowfish Module

 Perl Crypt::ECB Perl Module

Perl Crypt::CBC Module

 What is Crypt::CBC?

 Installing Crypt::CBC 2.33 with ActivePerl

 Crypt::CBC Encryption with Literal Keys

 Crypt::CBC Literal Key Error Cases

 Crypt::CBC Encryption with Crypt::Blowfish Objects

 Crypt::CBC Operation Simulation

Crypt::CBC Encryption Verification

 Blowfish CBC 2-Block Test Vectors

 Crypt::CBC Prepending IV to Ciphertext

 Crypt::CBC Encryption with Salted Keys

 Crypt::CBC Salted Key Test Cases

 Crypt::CBC Secret Key and IV Algorithm

 Crypt::CBC Encryption with Random Salt

 Crypt::CBC Padding Options

 Crypt::CBC Padding Option Tests

 Crypt::CBC Blowfish Encryption Summary

 Perl Crypt::CFB Perl Module

 OpenSSL "enc -bf-ecb" for Blowfish/ECB Encryption

 OpenSSL "enc -bf-cbc" for Blowfish/CBC Encryption

 OpenSSL "enc -bf-cfb" for Blowfish/CFB Encryption

 OpenSSL "enc -bf-ofb" for Blowfish/OFB Encryption

 References

 PDF Printing Version