英文:
Golang curve25519 pubkey generator
问题
我正在尝试实现curve25519算法用于公钥生成。但是我在如何从Go中的sha256编码字符串生成公钥方面遇到了困难。
我在Python中使用sha256编码字符串生成公钥没有问题：
import hashlib
import x25519
example_string = 'kerielle'
sha = hashlib.sha256(example_string.encode()).hexdigest()
hash_bytes = bytes.fromhex(sha)
public_key = x25519.scalar_base_mult(hash_bytes)
hex_res = public_key.hex()
print(hex_res)
>>> 0fa065fcaedecef9aebb5c79ea1c613e82bc5534c4b139d71f3a1cb0cb956652
但是在Go中如何做到这一点呢？以下是一个基本示例：
var publicKey [32]byte
privateKey := (*[32]byte)(bytes.Repeat([]byte("1"), 32))
curve25519.ScalarBaseMult(&publicKey, privateKey)
fmt.Printf("%x\n", publicKey)
>>> 04f5f29162c31a8defa18e6e742224ee806fc1718a278be859ba5620402b8f3a
英文:
I'm trying to implement the curve25519 algo for pubkey generation. But I got stuck on how to generate pubkey from sha256 encoded string in Go?
I have no problems with generation pubkey from sha256 encoded string via Python:
import hashlib
import x25519
example_string = 'kerielle'
sha = hashlib.sha256(example_string.encode()).hexdigest()
hash_bytes = bytes.fromhex(sha)
public_key = x25519.scalar_base_mult(hash_bytes)
hex_res = public_key.hex()
print(hex_res)
>>> 0fa065fcaedecef9aebb5c79ea1c613e82bc5534c4b139d71f3a1cb0cb956652
But how to do the same in Go? Here basic example:
var publicKey [32]byte
privateKey := (*[32]byte)(bytes.Repeat([]byte("1"), 32))
curve25519.ScalarBaseMult(&publicKey, privateKey)
fmt.Printf("%x\n", publicKey)
>>> 04f5f29162c31a8defa18e6e742224ee806fc1718a278be859ba5620402b8f3a
答案1
得分: 3
这只是复制了Python代码示例的结果，并考虑了curve25519.ScalarBaseMult()文档中的建议：
> 建议使用X25519函数与Basepoint一起使用，因为将数据复制到固定大小的数组中可能会导致意外的错误。
package main
import (
"crypto/sha256"
"fmt"
"log"
"golang.org/x/crypto/curve25519"
)
func main() {
example_string := "kerielle"
hash := sha256.Sum256([]byte(example_string))
publicKey, err := curve25519.X25519(hash[:], curve25519.Basepoint)
if err != nil {
log.Fatalf("curve25519.X25519() 失败: %v", err)
}
fmt.Printf("%x\n", publicKey)
}
输出：
0fa065fcaedecef9aebb5c79ea1c613e82bc5534c4b139d71f3a1cb0cb956652
英文:
This simply replicates the result of the Python code sample while also taking into account guidance from the curve25519.ScalarBaseMult() documentation:
> It is recommended to use the X25519 function with Basepoint instead,
> as copying into fixed size arrays can lead to unexpected bugs.
package main
import (
"crypto/sha256"
"fmt"
"log"
"golang.org/x/crypto/curve25519"
)
func main() {
example_string := "kerielle"
hash := sha256.Sum256([]byte(example_string))
publicKey, err := curve25519.X25519(hash[:], curve25519.Basepoint)
if err != nil {
log.Fatalf("curve25519.X25519() failed: %v", err)
}
fmt.Printf("%x\n", publicKey)
}
Output:
0fa065fcaedecef9aebb5c79ea1c613e82bc5534c4b139d71f3a1cb0cb956652
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