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| package main | |
| import ( | |
| "bytes" | |
| "crypto" | |
| "crypto/rand" | |
| "crypto/rsa" | |
| "crypto/sha512" | |
| "fmt" | |
| ) | |
| func main() { | |
| privateKey, err := rsa.GenerateKey(rand.Reader, 1024) | |
| if err != nil { | |
| fmt.Printf("rsa.GenerateKey: %v\n", err) | |
| return | |
| } | |
| message := "Hello World!" | |
| messageBytes := bytes.NewBufferString(message) | |
| hash := sha512.New() | |
| hash.Write(messageBytes.Bytes()) | |
| digest := hash.Sum(nil) | |
| fmt.Printf("messageBytes: %v\n", messageBytes) | |
| fmt.Printf("hash: %V\n", hash) | |
| fmt.Printf("digest: %v\n", digest) | |
| signature, err := rsa.SignPKCS1v15(rand.Reader, privateKey, crypto.SHA512, digest) | |
| if err != nil { | |
| fmt.Printf("rsa.SignPKCS1v15 error: %v\n", err) | |
| return | |
| } | |
| fmt.Printf("signature: %v\n", signature) | |
| err = rsa.VerifyPKCS1v15(&privateKey.PublicKey, crypto.SHA512, digest, signature) | |
| if err != nil { | |
| fmt.Printf("rsa.VerifyPKCS1v15 error: %V\n", err) | |
| } | |
| fmt.Println("Signature good!") | |
| } |
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