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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| package utils | ||
|
|
||
| import ( | ||
| "crypto/aes" | ||
| "crypto/cipher" | ||
| "crypto/rand" | ||
| "encoding/hex" | ||
| "fmt" | ||
| "io" | ||
| ) | ||
|
|
||
| func Encrypt(stringToEncrypt string, keyString string) (encryptedString string) { | ||
|
|
||
| //Since the key is in string, we need to convert decode it to bytes | ||
| key, _ := hex.DecodeString(keyString) | ||
| plaintext := []byte(stringToEncrypt) | ||
|
|
||
| //Create a new Cipher Block from the key | ||
| block, err := aes.NewCipher(key) | ||
| if err != nil { | ||
| panic(err.Error()) | ||
| } | ||
|
|
||
| //Create a new GCM - https://en.wikipedia.org/wiki/Galois/Counter_Mode | ||
| //https://golang.org/pkg/crypto/cipher/#NewGCM | ||
| aesGCM, err := cipher.NewGCM(block) | ||
| if err != nil { | ||
| panic(err.Error()) | ||
| } | ||
|
|
||
| //Create a nonce. Nonce should be from GCM | ||
| nonce := make([]byte, aesGCM.NonceSize()) | ||
| if _, err = io.ReadFull(rand.Reader, nonce); err != nil { | ||
| panic(err.Error()) | ||
| } | ||
|
|
||
| //Encrypt the data using aesGCM.Seal | ||
| //Since we don't want to save the nonce somewhere else in this case, we add it as a prefix to the encrypted data. The first nonce argument in Seal is the prefix. | ||
| ciphertext := aesGCM.Seal(nonce, nonce, plaintext, nil) | ||
| return fmt.Sprintf("%x", ciphertext) | ||
| } | ||
|
|
||
| func Decrypt(encryptedString string, keyString string) (decryptedString string) { | ||
|
|
||
| key, _ := hex.DecodeString(keyString) | ||
| enc, _ := hex.DecodeString(encryptedString) | ||
|
|
||
| //Create a new Cipher Block from the key | ||
| block, err := aes.NewCipher(key) | ||
| if err != nil { | ||
| panic(err.Error()) | ||
| } | ||
|
|
||
| //Create a new GCM | ||
| aesGCM, err := cipher.NewGCM(block) | ||
| if err != nil { | ||
| panic(err.Error()) | ||
| } | ||
|
|
||
| //Get the nonce size | ||
| nonceSize := aesGCM.NonceSize() | ||
|
|
||
| //Extract the nonce from the encrypted data | ||
| nonce, ciphertext := enc[:nonceSize], enc[nonceSize:] | ||
|
|
||
| //Decrypt the data | ||
| plaintext, err := aesGCM.Open(nil, nonce, ciphertext, nil) | ||
| if err != nil { | ||
| panic(err.Error()) | ||
| } | ||
|
|
||
| return fmt.Sprintf("%s", plaintext) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| package xopen | ||
|
|
||
| import ( | ||
| "compress/gzip" | ||
| "io" | ||
| "os/exec" | ||
| ) | ||
|
|
||
| // from: https://gist.github.com/rasky/d42a52c16683f1a2f4dccdef80e2712d | ||
|
|
||
| // fastGzReader is an API-compatible drop-in replacement | ||
| // for gzip.Reader, that achieves a higher decoding speed | ||
| // by spawning an external gzip instance and pipeing data | ||
| // through it. | ||
| // Go's native gzip implementation is about 2x slower at | ||
| // decompressing data compared to zlib (mostly due to Go compiler | ||
| // inefficiencies). So for tasks where the gzip decoding | ||
| // speed is important, this is a quick workaround that doesn't | ||
| // require cgo. | ||
| // gzip is part of the gzip package and comes preinstalled on | ||
| // most Linux distributions and on OSX. | ||
| type fastGzReader struct { | ||
| io.ReadCloser | ||
| } | ||
|
|
||
| func hasProg(prog ...string) bool { | ||
| var cmd *exec.Cmd | ||
| if len(prog) > 1 { | ||
| cmd = exec.Command(prog[0], prog[1:]...) | ||
| } else { | ||
| cmd = exec.Command(prog[0]) | ||
| } | ||
| err := cmd.Start() | ||
| has := err == nil | ||
| cmd.Wait() | ||
| return has | ||
| } | ||
|
|
||
| var hasZlib = hasProg("gzip", "-d") | ||
| var hasPigz = hasProg("pigz", "-d") | ||
|
|
||
| func newFastGzReader(r io.Reader) (io.ReadCloser, error) { | ||
|
|
||
| if hasZlib || hasPigz { | ||
| var gz fastGzReader | ||
| if err := gz.Reset(r); err != nil { | ||
| return nil, err | ||
| } | ||
| return gz, nil | ||
| } | ||
| return gzip.NewReader(r) | ||
|
|
||
| } | ||
|
|
||
| func (gz *fastGzReader) Reset(r io.Reader) error { | ||
| if gz.ReadCloser != nil { | ||
| gz.Close() | ||
| } | ||
| var cmd *exec.Cmd | ||
| if hasPigz { | ||
| cmd = exec.Command("pigz", "-d") | ||
| } else { | ||
| cmd = exec.Command("gzip", "-d") | ||
| } | ||
| cmd.Stdin = r | ||
|
|
||
| rpipe, err := cmd.StdoutPipe() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| err = cmd.Start() | ||
| if err != nil { | ||
| rpipe.Close() | ||
| return err | ||
| } | ||
|
|
||
| gz.ReadCloser = rpipe | ||
| return nil | ||
| } |
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