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golang aes-256-gcm no-magic
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package main | |
import ( | |
"crypto/aes" | |
"crypto/cipher" | |
"crypto/rand" | |
"fmt" | |
"io" | |
) | |
func ExampleNewGCMEncrypter(input string) ([]byte, []byte) { | |
// The key argument should be the AES key, either 16 or 32 bytes | |
// to select AES-128 or AES-256. | |
key := []byte("AES256Key-32Characters1234567890") | |
plaintext := []byte(input) | |
block, err := aes.NewCipher(key) | |
if err != nil { | |
panic(err.Error()) | |
} | |
// Never use more than 2^32 random nonces with a given key because of the risk of a repeat. | |
nonce := make([]byte, 12) | |
if _, err := io.ReadFull(rand.Reader, nonce); err != nil { | |
panic(err.Error()) | |
} | |
fmt.Printf("Nonce:%x\n", nonce) | |
aesgcm, err := cipher.NewGCM(block) | |
if err != nil { | |
panic(err.Error()) | |
} | |
ciphertext := aesgcm.Seal(nil, nonce, plaintext, nil) | |
fmt.Printf("Cyphertext:%x\n", ciphertext) | |
return ciphertext, nonce | |
} | |
func ExampleNewGCMDecrypter(ciphertext []byte, nonce[]byte) { | |
// The key argument should be the AES key, either 16 or 32 bytes | |
// to select AES-128 or AES-256. | |
key := []byte("AES256Key-32Characters1234567890") | |
block, err := aes.NewCipher(key) | |
if err != nil { | |
panic(err.Error()) | |
} | |
aesgcm, err := cipher.NewGCM(block) | |
if err != nil { | |
panic(err.Error()) | |
} | |
plaintext, err := aesgcm.Open(nil, nonce, ciphertext, nil) | |
if err != nil { | |
panic(err.Error()) | |
} | |
fmt.Printf("Plaintext: %s\n", plaintext) | |
// Output: exampleplaintext | |
} | |
func main() { | |
cyphertext, nonce := ExampleNewGCMEncrypter("exampleplaintext") | |
ExampleNewGCMDecrypter(cyphertext, nonce) | |
} |
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