43 lines
981 B
Go
43 lines
981 B
Go
package main
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import (
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/sha256"
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"encoding/binary"
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"fmt"
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"log"
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)
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func check(err error) {
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if err != nil {
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log.Fatal(err)
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}
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}
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func main() {
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priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
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check(err)
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fmt.Println("Private key:\nD:", priv.D)
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pub := priv.Public().(*ecdsa.PublicKey)
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fmt.Println("\nPublic key:")
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fmt.Println("X:", pub.X)
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fmt.Println("Y:", pub.Y)
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msg := "Rosetta Code"
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fmt.Println("\nMessage:", msg)
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hash := sha256.Sum256([]byte(msg)) // as [32]byte
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hexHash := fmt.Sprintf("0x%x", binary.BigEndian.Uint32(hash[:]))
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fmt.Println("Hash :", hexHash)
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r, s, err := ecdsa.Sign(rand.Reader, priv, hash[:])
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check(err)
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fmt.Println("\nSignature:")
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fmt.Println("R:", r)
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fmt.Println("S:", s)
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valid := ecdsa.Verify(&priv.PublicKey, hash[:], r, s)
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fmt.Println("\nSignature verified:", valid)
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}
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