decrypt using rsa

Type

command

Summary

Used to decrypt a file or string with RSA public or private keys and an optional passphrase.

Syntax

decrypt <message> using rsa with {public | private} key <key> [and passphrase <passphrase>] [and padding <padding>]

Description

Use the decrypt using rsa command to decrypt a message using RSA public key encryption.

To decode a message that a sender has encrypted with its corresponding public key, use the form:

    decrypt tMessage with private key tPrivateKey

As a verify operation to ensure that a message has been encoded with the corresponding private key and it has come from one of its holders, use the form:

    decrypt tMessage with public key tPublicKey

The optional padding phrase determines the padding mode used when performing the operation. It can be one of:

• none: no padding is done, the application must pad the message appropriately
• pkcs1: PKCS #1 v1.5 padding is used.
• pkcs1-oaep: EME-OAEP as defined in PKCS #1 v2.0 with SHA-1, MGF1 and an empty encoding parameter.

If no padding phrase is provided, then the pkcs1 is used. Note:The pkcs1-oaep mode is only supported when decrypting with a private key, trying to use it when decrypting with a public key will return an error. Important:It is recommended that all new applications use the pkcs1-oaep padding mode when using private key decryption.

*Generating key pairs -

Public-private key pairs can be generated using the OpenSSL suite of command-line tools. For example: openssl genrsa -out private_key.pem 512 openssl rsa -pubout -in private_key.pem -out public_key.pem Will generate a key pair of size 512-bits, placing the private key in private_key.pem and the public key in public_key.pem.

For more information on these utilities see https://www.openssl.org/docs/manmaster/man1/rsa.html and https://www.openssl.org/docs/manmaster/man1/genrsa.html.

Parameters

Name	Type	Description
key		The key to be used for the decryption, in PEM format
passphrase		An optional passphrase
padding		An optional padding mode
message		The message to be decrypted

Examples

decrypt tMessage using rsa with public key tPublicKey

decrypt field 1 using rsa with private key tPrivateKey

Related

command: decrypt, encrypt, encrypt using rsa

Compatibility and Support

Introduced

LiveCode 4.6

OS

mac

windows

linux

ios

android

Platforms

desktop

server

mobile