How To Encrypt A Big File Using OpenSSL



This article explains how to encrypt large files with OpenSSL and Public/Private keys.

Step 0) Get Private and Public Key


For Windows
Create Private Key: 
openssl genrsa -aes256 -out privatekey.pem 8912 
Create Public Key: 
openssl rsa -in privatekey.pem -pubout -out publickey.pem

For Linux  
Create Private Key:
openssl genrsa -aes256 -out privatekey.pem 8912
Create Public Key:
openssl req -x509 -nodes -days 100000 -newkey rsa:2048  -keyout privatekey.pem  -out publickey.pem

Step 1) Create Certificate for Windows Only

openssl req -x509 -nodes -days 100000 -newkey rsa:8912 -keyout privatekey.pem -config "C:\Users\USERPC\AppData\Local\VirtualStore\Program Files\GnuWin32\bin\openssl.cnf" -out certificate.pem

Step 2) Encrypt our large file

For Windows
openssl smime -encrypt -binary -aes256 -in test.zip -out testenc.zip -outform PEM certificate.pem

For Linux
openssl smime  -encrypt -aes256  -in  test.zip  -binary  -outform DEM  -out  testenc.zip  publickey.pem


Step 3) Decrypt our large file

For Windows
openssl smime -decrypt -binary -in testenc.zip -inform PEM -out decrypted.zip -inkey privatekey.pem

For Linux
openssl smime -decrypt  -in  testenc.zip  -binary -inform DEM -inkey privatekey.pem  -out  decrypted.zip


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