Java RSA （SHA1withRSA）签名和验签详解编程语言

static { 
    try { 
        SIGNATURE = Signature.getInstance("SHA1withRSA", "BC"); 
    } catch (NoSuchAlgorithmException | NoSuchPaddingException | NoSuchProviderException e) { 
        throw Throwables.propagate(e); 
    } 
} 
 
public static String getSignature(Map<String, String> map, String pfxPath, String pfxPasswd) { 
    try { 
        SIGNATURE.initSign(X509Certs.getPrivateKey(pfxPath, pfxPasswd).getPrivateKey()); 
        SIGNATURE.update(DigestUtils.sha1Hex(buildReqParams(map, false)).getBytes(Charsets.UTF_8)); 
        return Base64.encodeBase64String(SIGNATURE.sign()).replaceAll("/r|/n", ""); 
    } catch (Throwable e) { 
        throw Throwables.propagate(e); 
    } 
} 
 
public static void verifySign(Map<String, String> map, String certPath) throws GatewayFrontException { 
    try { 
        byte[] sign = Base64.decodeBase64(map.get("signature").getBytes(Charsets.UTF_8)); 
        map.remove("signature"); 
        SIGNATURE.initVerify(X509Certs.getVerifyPublicKey(certPath)); 
        SIGNATURE.update(DigestUtils.sha1Hex(ExPayUtil.buildReqParams(map, false)).getBytes(Charsets.UTF_8)); 
        Preconditions.checkState(SIGNATURE.verify(sign), ExPayConstant.VERIFY_SIGNATURE_FAILUE); 
    } catch (Exception e) { 
        throw Throwables.propagate(e); 
    } 
}