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Posted 7 Aug 2011

Blowfish Encryption Implementation in .NET

, 21 May 2012
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Blowfish encryption is very popular for encrypting data but its really hard to find a simple .net implementation of this algorithm. This articles tries to solve this problem.

Recently, while working on a project we needed a component in .Net which can encrypt/decrypt user password using Blowfish algorithm with a encryption key. We searched hard to get a ready made free .Net component to accomplish this task but found none! Finally we found a implementation hint from a article posted on igniterealtime. We took the file from Spark IM project and ported it to a .NET dll using ikvm, a jvm for .Net. We then referenced the dlls and used the encrypt and decrypt methods to do the required tasks.

Its very easy to implement this algorithm using attached Dlls. Download the zip file which contains three dlls - 'Blowfish.dll', 'IKVM.OpenJDK.Core.dll', and 'IKVM.Runtime.dll'. Add reference to these three dlls in your project.
Declare the namespace on the top of the class file:
using org.jivesoftware.util;
Next, declare an instance of the Blowfish class:
Blowfish algo = new Blowfish(encryptionKey);
Next, call the appropriate method to encrypt/decrypt the text:
string encryptedTxt = algo.encryptString("this is my test string");
string decryptedTxt = algo.decryptString(encryptedTxt);
Thats it! Thats all that we have to do to implement this algorithm.
History - First publish - 03 Aug 2011.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Ravinder Singh Yadav
Program Manager Brand Recourse Technologies
India India
Ravinder is an experienced software developer and project manager having around 12+ years of experience in Project management and software development field. He has done Bachelor of Engineering and Post Graduate Diploma with Information Technology as major. He is PMP certified professional from PMI, USA. He likes to code in .Net specifically for window based applications. Currently he is associated with Brand Recourse Technologies, Noida, India as Chief Technology Officer.

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Comments and Discussions

GeneralMy vote of 1 Pin
jdippner21-Jan-16 2:17
memberjdippner21-Jan-16 2:17 
QuestionInitialization Vector Pin
BlueFish10121-Jul-15 8:09
memberBlueFish10121-Jul-15 8:09 
AnswerRe: Initialization Vector Pin
Ravinder Singh, PMP21-Jul-15 8:24
memberRavinder Singh, PMP21-Jul-15 8:24 
GeneralRe: Initialization Vector Pin
BlueFish10121-Jul-15 9:52
memberBlueFish10121-Jul-15 9:52 
GeneralRe: Initialization Vector Pin
BlueFish10121-Jul-15 10:06
memberBlueFish10121-Jul-15 10:06 
GeneralRe: Initialization Vector Pin
BlueFish10123-Jul-15 14:21
memberBlueFish10123-Jul-15 14:21 
GeneralRe: Initialization Vector Pin
Ravinder Singh, PMP24-Jul-15 8:03
memberRavinder Singh, PMP24-Jul-15 8:03 
Questiondear sir, have you tried to encrypt a text file using blowfish ? Pin
zhangdf1129-Apr-14 7:56
memberzhangdf1129-Apr-14 7:56 
AnswerRe: dear sir, have you tried to encrypt a text file using blowfish ? Pin
Ravinder Singh, PMP30-Apr-14 8:46
memberRavinder Singh, PMP30-Apr-14 8:46 
GeneralRe: dear sir, have you tried to encrypt a text file using blowfish ? Pin
zhangdf1130-Apr-14 17:07
memberzhangdf1130-Apr-14 17:07 
Questioni got an error Pin
Member 968398326-Dec-13 20:44
memberMember 968398326-Dec-13 20:44 
QuestionError on using Pin
Member 1037612110-Dec-13 5:22
memberMember 1037612110-Dec-13 5:22 
AnswerRe: Error on using Pin
Ravinder Singh, PMP10-Dec-13 7:10
memberRavinder Singh, PMP10-Dec-13 7:10 
GeneralRe: Error on using Pin
raoulFR10-Dec-13 8:38
professionalraoulFR10-Dec-13 8:38 
GeneralMy Vote 5 stars Pin
veski4a9216-Oct-13 23:02
memberveski4a9216-Oct-13 23:02 
Questionproblem Pin
creativemujahid28-Apr-13 23:35
membercreativemujahid28-Apr-13 23:35 
AnswerRe: problem Pin
Ravinder Singh, PMP1-May-13 20:00
memberRavinder Singh, PMP1-May-13 20:00 
Questionhaving trouble Pin
Alvaro3197-Jan-13 10:24
memberAlvaro3197-Jan-13 10:24 
QuestionThank you so much ! Pin
Samanph11-Sep-12 6:11
memberSamanph11-Sep-12 6:11 
AnswerRe: Thank you so much ! Pin
Ravinder Singh, PMP11-Sep-12 7:30
memberRavinder Singh, PMP11-Sep-12 7:30 
QuestionBlowfish output Pin
rautyog22-Jun-12 3:09
memberrautyog22-Jun-12 3:09 
AnswerRe: Blowfish output Pin
Ravinder Singh, PMP22-Jun-12 9:05
memberRavinder Singh, PMP22-Jun-12 9:05 
Questionnot found the page Pin
Grenseal20-May-12 22:17
memberGrenseal20-May-12 22:17 
AnswerRe: not found the page Pin
Ravinder Singh, PMP21-May-12 6:39
memberRavinder Singh, PMP21-May-12 6:39 
GeneralRe: not found the page Pin
Grenseal21-May-12 18:15
memberGrenseal21-May-12 18:15 
Thank you so much Smile | :)

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