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67 lines
2.1 KiB
Markdown
67 lines
2.1 KiB
Markdown
# Luzifer / go-openssl
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`go-openssl` is a small library wrapping the `crypto/aes` functions in a way the output is compatible to OpenSSL / CryptoJS. For all encryption / decryption processes AES256 is used so this library will not be able to decrypt messages generated with other than `openssl aes-256-cbc`. If you're using CryptoJS to process the data you also need to use AES256 on that side.
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## OpenSSL 1.1.0
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With the release of OpenSSL 1.1.0c the default hashing algorithm [changed from `md5` to `sha256`](https://www.cryptopp.com/wiki/OPENSSL_EVP_BytesToKey). Using this new default breaks the en- and decryption used in this library. Currently you need to specify to use `md5` hashing when encrypting using `openssl enc -aes-256-cbc -a -k yourpassword -md md5`. Sadly using `sha256` is not a drop-in replacement and therefore needs to be implemented as a separate function following the OpenSSL source code.
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## Installation
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```
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go get github.com/Luzifer/go-openssl
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```
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## Usage example
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The usage is quite simple as you don't need any special knowledge about OpenSSL and/or AES256:
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### Encrypt
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```go
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import (
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"fmt"
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"github.com/Luzifer/go-openssl"
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)
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func main() {
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plaintext := "Hello World!"
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passphrase := "z4yH36a6zerhfE5427ZV"
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o := openssl.New()
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enc, err := o.EncryptString(passphrase, plaintext)
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if err != nil {
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fmt.Printf("An error occurred: %s\n", err)
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}
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fmt.Printf("Encrypted text: %s\n", string(enc))
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}
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```
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### Decrypt
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```go
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import (
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"fmt"
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"github.com/Luzifer/go-openssl"
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)
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func main() {
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opensslEncrypted := "U2FsdGVkX19ZM5qQJGe/d5A/4pccgH+arBGTp+QnWPU="
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passphrase := "z4yH36a6zerhfE5427ZV"
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o := openssl.New()
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dec, err := o.DecryptString(passphrase, opensslEncrypted)
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if err != nil {
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fmt.Printf("An error occurred: %s\n", err)
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}
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fmt.Printf("Decrypted text: %s\n", string(dec))
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}
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```
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## Testing
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To execute the tests for this library you need to be on a system having `/bin/bash` and `openssl` available as the compatibility of the output is tested directly against the `openssl` binary. The library itself should be usable on all operating systems supported by Go and `crypto/aes`.
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