Road to growth of rookie

AB

DimeHenman

public keyprivate key

RSA

RSAElgamalRabinD-HECCRSARSARSA

RSARSARSA

ASN.1

ASN.1Abstract Syntax Notation OneASN.1Basic Encoding RulesBERCanonical Encoding RulesCERDistinguished Encoding RulesDERPacked Encoding RulesPERXMLXML Encoding RulesXER

X.509

X.509X.509TLS/SSLX.509X.509ASN.1ASN.1 DER

golangRSA

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package main

import (
	"crypto/rand"
	"crypto/rsa"
	"crypto/x509"
	"encoding/pem"
	"fmt"
	"os"
)

func generatePrinAndPubKeys(size int) {
	pri, err := rsa.GenerateKey(rand.Reader, size)
	if err != nil {
		panic(fmt.Sprintf("generate rsa keys fail: %s", err))
	}

	derTx := x509.MarshalPKCS1PrivateKey(pri)
	block := pem.Block{Type: "RSA PRIVATE KEY", Bytes: derTx}
	file, err := os.Create("private.pem")
	if err != nil {
		panic(fmt.Sprintf("create file fail: %s", err))
	}
	defer file.Close()

	if err := pem.Encode(file, &block); err != nil {
		panic(fmt.Sprintf("private key input file fail: %s", err))
	}

	derstream, err := x509.MarshalPKIXPublicKey(&pri.PublicKey)
	if err != nil {
		panic(fmt.Sprintf("marshal public key fail: %s", err))
	}
	block = pem.Block{Type: "RSA PUBLIC KEY", Bytes: derstream}
	pubFile, err := os.Create("public.pem")
	if err != nil {
		panic(fmt.Sprintf("create file fail: %s", err))
	}
	defer pubFile.Close()
	if err := pem.Encode(pubFile, &block); err != nil {
		panic(fmt.Sprintf("private key input file fail: %s", err))
	}
}

func main() {
	generatePrinAndPubKeys(1024)
}

golangRSA

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package main

import (
	"crypto/rand"
	"crypto/rsa"
	"crypto/x509"
	"encoding/base64"
	"encoding/pem"
	"fmt"
	"io/ioutil"
)

func publicKeyEncrypt(plainText []byte, keyFile string) []byte {
	content, err := ioutil.ReadFile(keyFile)
	if err != nil {
		panic(fmt.Sprintf("read public key file fail: %s", err))
	}
	block, _ := pem.Decode(content)
	pubInterface, err := x509.ParsePKIXPublicKey(block.Bytes)
	if err != nil {
		panic(fmt.Sprintf("parse public key fail: %s", err))
	}
	pubKey := pubInterface.(*rsa.PublicKey)
	cipherTxt, err := rsa.EncryptPKCS1v15(rand.Reader, pubKey, plainText)
	if err != nil {
		panic(fmt.Sprintf("encrypt plain fail: %s", err))
	}

	return cipherTxt
}

func privateKeyDecrypt(cipherTxt []byte, keyFile string) []byte {
	content, err := ioutil.ReadFile(keyFile)
	if err != nil {
		panic(fmt.Sprintf("read private key file fail: %s", err))
	}
	block, _ := pem.Decode(content)
	priKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)
	if err != nil {
		panic(fmt.Sprintf("parse private key fail: %s", err))
	}

	plainTxt, err := rsa.DecryptPKCS1v15(rand.Reader, priKey, cipherTxt)
	if err != nil {
		panic(fmt.Sprintf("decrypt cipher fail: %s", err))
	}

	return plainTxt
}

func main()  {
	txt := "this is testing text"
	cipher := publicKeyEncrypt([]byte(txt), "public.pem")
	fmt.Printf("%v\n", base64.StdEncoding.EncodeToString(cipher))
	fmt.Printf("%s\n", string(privateKeyDecrypt(cipher, "private.pem")))
}

golangRSA

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package main

import (
	"crypto"
	"crypto/rand"
	"crypto/rsa"
	"crypto/sha256"
	"crypto/x509"
	"encoding/pem"
	"fmt"
	"io/ioutil"
)

func signByRsa(priFile string, plaintext []byte) []byte {
	content, err := ioutil.ReadFile(priFile)
	if err != nil {
		panic(fmt.Sprintf("read private key file fail: %s", err))
	}

	derTxt, _ := pem.Decode(content)
	priKey, err := x509.ParsePKCS1PrivateKey(derTxt.Bytes)
	if err != nil {
		panic(fmt.Sprintf("parse private key fail: %s", err))
	}

	h := sha256.New()
	h.Write(plaintext)

	hashed, err := rsa.SignPKCS1v15(rand.Reader, priKey, crypto.SHA256, h.Sum(nil))
	if err != nil {
		panic(fmt.Sprintf("sign plaintext fail: %s", err))
	}

	return hashed
}

func verifyByRsa(pubFile string, plaintext, sign []byte) bool {
	content, err := ioutil.ReadFile(pubFile)
	if err != nil {
		panic(fmt.Sprintf("read public key file fail: %s", err))
	}

	derTxt, _ := pem.Decode(content)
	pubInterface, err := x509.ParsePKIXPublicKey(derTxt.Bytes)
	if err != nil {
		panic(fmt.Sprintf("parse public key fail: %s", err))
	}
	pubKey := pubInterface.(*rsa.PublicKey)

	h := sha256.New()
	h.Write(plaintext)

	if err := rsa.VerifyPKCS1v15(pubKey, crypto.SHA256, h.Sum(nil), sign); err != nil {
		return false
	}

	return true
}

func main() {
	txt := []byte("this is testing text")
	sign := signByRsa("private.pem", txt)
	fmt.Printf("sign verify result: %v\n", verifyByRsa("public.pem", txt, sign))
}

golang

椭圆曲线非对称加密算法

Elliptic Curve CryptographyECCGolangECCRSA

GolangECCECCgo-ethereumECC

GolangECC

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package main

import (
	"crypto/ecdsa"
	"crypto/elliptic"
	"crypto/rand"
	"crypto/x509"
	"encoding/pem"
	"fmt"
	"os"
)

func generatePriAndPubKeys(curve elliptic.Curve)  {
	priKey, err := ecdsa.GenerateKey(curve, rand.Reader)
	if err != nil {
		panic(fmt.Sprintf("generate private key fail: %s", err))
	}

	derTxt, err := x509.MarshalECPrivateKey(priKey)
	if err != nil {
		panic(fmt.Sprintf("marshal private key fail: %s", err))
	}

	block := pem.Block{Type: "ECC PRIVATE KEY", Bytes: derTxt}
	file, err := os.Create("ecc_private.pem")
	if err != nil {
		panic(fmt.Sprintf("create private key file fail: %s", err))
	}
 	defer file.Close()

	if err := pem.Encode(file, &block); err != nil {
		panic(fmt.Sprintf("write private key fail: %s", err))
	}

	pubDerTxt, err := x509.MarshalPKIXPublicKey(&priKey.PublicKey)
	if err != nil {
		panic(fmt.Sprintf("marshal public key fail: %s", err))
	}

	pubBlock := pem.Block{Type: "ECC PRIVATE KEY", Bytes: pubDerTxt}
	pubFile, err := os.Create("ecc_public.pem")
	if err != nil {
		panic(fmt.Sprintf("create private key file fail: %s", err))
	}
	defer pubFile.Close()

	if err := pem.Encode(pubFile, &pubBlock); err != nil {
		panic(fmt.Sprintf("write private key fail: %s", err))
	}
}

func main()  {
	generatePriAndPubKeys(elliptic.P256())
}

golangECC

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package main

import (
	"crypto/ecdsa"
	"crypto/rand"
	"crypto/sha256"
	"crypto/x509"
	"encoding/pem"
	"fmt"
	"io/ioutil"
	"math/big"
)

func signByEcc(priFile string, plaintext []byte) (rTxt, sTxt []byte) {
	content, err := ioutil.ReadFile(priFile)
	if err != nil {
		panic(fmt.Sprintf("read private key file fail: %s", err))
	}

	block, _ := pem.Decode(content)
	priKey, err := x509.ParseECPrivateKey(block.Bytes)
	if err != nil {
		panic(fmt.Sprintf("parse private key fail: %s", err))
	}

	h := sha256.New()
	h.Write(plaintext)

	r, s, err := ecdsa.Sign(rand.Reader, priKey, h.Sum(nil))
	if err != nil {
		panic(fmt.Sprintf("sign fail: %s", err))
	}

	rTxt, _ = r.MarshalText()
	sTxt, _ = s.MarshalText()

	return rTxt, sTxt
}

func verifyByEcc(pubFile string, plaintext, rTxt, sTxt []byte) bool {
	content, err := ioutil.ReadFile(pubFile)
	if err != nil {
		panic(fmt.Sprintf("read public key file fail: %s", err))
	}

	block, _ := pem.Decode(content)
	pubInterface, err := x509.ParsePKIXPublicKey(block.Bytes)
	if err != nil {
		panic(fmt.Sprintf("parse public key fail: %s", err))
	}
	pubKey := pubInterface.(*ecdsa.PublicKey)
	r, s := new(big.Int), new(big.Int)
	if err := r.UnmarshalText(rTxt); err != nil {
		panic(fmt.Sprintf("unmarshal r fail: %s", err))
	}
	if err := s.UnmarshalText(sTxt); err != nil {
		panic(fmt.Sprintf("unmarshal s fail: %s", err))
	}

	h := sha256.New()
	h.Write(plaintext)

	return ecdsa.Verify(pubKey, h.Sum(nil), r, s)
}

func main() {
	txt := []byte("this is testing text")
	r, s := signByEcc("ecc_private.pem", txt)
	fmt.Printf("sign verify result: %v\n", verifyByEcc("ecc_public.pem", txt, r, s))
}

参考和引用