我使用 OpenSSL（在 C++ 中）对文本进行签名，但是我的 Java 程序并不总是验证签名消息（只有大约五分之一得到验证）。有趣的是https://kjur.github.io/jsrsasign/sample/sample-ecdsa.html https://kjur.github.io/jsrsasign/sample/sample-ecdsa.html不验证其中任何一个：
曲线名称：secp256k1签名算法：SHA256 和 ECDSA
私钥
431313701ec60d303fa7d027d5f1579eaa57f0e870b23e3a25876e61bed2caa3
公钥
035bcefc4a6ca257e394e82c20027db2af368474afb8917273713644f11a7cecb3
Failed:
text to sign=
pcax2727gRo8M6vf9Vjhr1JDrQ3rdPYu6xx81000pcax273z8kaV5Ugsiqz3tvWGo8Gg6sch6V4912341535867163229
signature=
3044022061dff8e39f9324b0794ec2c58abda971898f694ca980baf3c2a4045a9048b441022054a2fb8ef3d383fd7eeb31425dba440e2fd2053778d4ab3725046385c7845cff0000
成功的:
text to sign=
pcax2727gRo8M6vf9Vjhr1JDrQ3rdPYu6xx81000pcax273z8kaV5Ugsiqz3tvWGo8Gg6sch6V4912341535867122614
signature=
3046022100f200d0fb9e86a16bd46ee2dd11f1840a436d0a5c6823001a516e975a44906fcf022100d062a60611fc0f21d81fa3140741c8b6e650fff33d2c48aef69a3a40d7c7b3ca
Java
private static final String SHA256WITH_ECDSA = "SHA256withECDSA";
public static boolean isValidSignature(PublicKey pub, byte[] dataToVerify, byte[] signature) {
try {
Signature sign = Signature.getInstance(SHA256WITH_ECDSA, BouncyCastleProvider.PROVIDER_NAME);
sign.initVerify(pub);
sign.update(dataToVerify);
return sign.verify(signature);
} catch (Exception e) {
log.error("Error: " + e.getMessage());
}
return false;
}
C++
std::vector<unsigned char> utils::crypto::sign(std::string& private_key_58, std::string& message) {
auto priv_bytes = utils::base58::decode_base(private_key_58);
auto digest = utils::crypto::sha256(message);
auto key = utils::crypto::ec_new_keypair(priv_bytes);
auto signature = ECDSA_do_sign(digest.data(), digest.size(), key);
auto der_len = ECDSA_size(key);
auto der = (uint8_t*) calloc(der_len, sizeof(uint8_t));
auto der_copy = der;
i2d_ECDSA_SIG(signature, &der_copy);
std::vector<unsigned char> s (der, der+der_len);
return s;
}
std::vector<unsigned char> utils::crypto::sha256(std::string& str) {
unsigned char hash[SHA256_DIGEST_LENGTH];
SHA256_CTX sha256;
SHA256_Init(&sha256);
SHA256_Update(&sha256, str.c_str(), str.size());
SHA256_Final(hash, &sha256);
std::vector<unsigned char> data(hash, hash + SHA256_DIGEST_LENGTH);
return data;
}
EC_KEY *utils::crypto::ec_new_keypair(std::vector<unsigned char>& priv_bytes) {
EC_KEY *key = nullptr;
BIGNUM *priv = nullptr;
BN_CTX *ctx = nullptr;
const EC_GROUP *group = nullptr;
EC_POINT *pub = nullptr;
key = EC_KEY_new_by_curve_name(NID_secp256k1);
if (!key) {
std::cerr << "Can't generate curve secp256k1\n";
std::abort();
}
priv = BN_new();
BN_bin2bn(priv_bytes.data(), 32, priv);
EC_KEY_set_private_key(key, priv);
ctx = BN_CTX_new();
BN_CTX_start(ctx);
group = EC_KEY_get0_group(key);
pub = EC_POINT_new(group);
EC_POINT_mul(group, pub, priv, NULL, NULL, ctx);
EC_KEY_set_public_key(key, pub);
EC_POINT_free(pub);
BN_CTX_end(ctx);
BN_CTX_free(ctx);
BN_clear_free(priv);
return key;
}
