100 lines
3.5 KiB
Objective-C
100 lines
3.5 KiB
Objective-C
//
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// KBSignUtils.m
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// keyBoard
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//
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// Created by Mac on 2025/12/4.
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//
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#import "KBSignUtils.h"
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#import <CommonCrypto/CommonCrypto.h>
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@implementation KBSignUtils
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+ (NSString *)urlEncode:(NSString *)value {
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if (!value) return @"";
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// 按 application/x-www-form-urlencoded 规则编码（更贴近后端常见实现）
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NSMutableCharacterSet *allowed = [NSMutableCharacterSet alphanumericCharacterSet];
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[allowed addCharactersInString:@"-._*"];
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NSString *encoded = [value stringByAddingPercentEncodingWithAllowedCharacters:allowed];
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if (!encoded) {
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return value;
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}
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// 空格改为 +（URLEncoder 风格）
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encoded = [encoded stringByReplacingOccurrencesOfString:@"%20" withString:@"+"];
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return encoded;
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}
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+ (NSString *)hmacSHA256:(NSString *)data secret:(NSString *)secret {
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const char *cKey = [secret cStringUsingEncoding:NSUTF8StringEncoding];
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const char *cData = [data cStringUsingEncoding:NSUTF8StringEncoding];
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unsigned char cHMAC[CC_SHA256_DIGEST_LENGTH];
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CCHmac(kCCHmacAlgSHA256,
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cKey,
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strlen(cKey),
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cData,
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strlen(cData),
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cHMAC);
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// 转十六进制小写字符串
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NSMutableString *output = [NSMutableString stringWithCapacity:CC_SHA256_DIGEST_LENGTH * 2];
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for (int i = 0; i < CC_SHA256_DIGEST_LENGTH; i++) {
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[output appendFormat:@"%02x", cHMAC[i]];
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}
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return output;
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}
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+ (NSString *)signWithParams:(NSDictionary<NSString *, NSString *> *)params
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secret:(NSString *)secret {
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NSString *dataString = [self signSourceStringWithParams:params secret:secret];
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return [self hmacSHA256:dataString secret:secret];
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}
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+ (NSString *)signSourceStringWithParams:(NSDictionary<NSString *, NSString *> *)params
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secret:(NSString *)secret {
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// 1. 过滤空值 & sign 自身
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NSMutableDictionary<NSString *, NSString *> *filtered = [NSMutableDictionary dictionary];
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[params enumerateKeysAndObjectsUsingBlock:^(NSString *key, NSString *obj, BOOL *stop) {
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if (!obj || obj.length == 0) return;
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if ([[key lowercaseString] isEqualToString:@"sign"]) return;
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filtered[key] = obj;
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}];
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// 2. 按 key 字典序排序
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NSArray<NSString *> *sortedKeys = [[filtered allKeys] sortedArrayUsingSelector:@selector(compare:)];
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// 3. 拼接 key=value&key2=value2...&secret=xxx
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NSMutableArray<NSString *> *components = [NSMutableArray array];
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for (NSString *key in sortedKeys) {
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NSString *value = filtered[key] ?: @"";
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NSString *encodedValue = [self urlEncode:value];
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NSString *part = [NSString stringWithFormat:@"%@=%@", key, encodedValue];
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[components addObject:part];
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}
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NSString *encodedSecret = [self urlEncode:secret ?: @""];
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NSString *secretPart = [NSString stringWithFormat:@"secret=%@", encodedSecret];
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[components addObject:secretPart];
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return [components componentsJoinedByString:@"&"];
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}
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+ (NSString *)currentTimestamp {
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NSTimeInterval ts = [[NSDate date] timeIntervalSince1970];
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long long seconds = (long long)ts;
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return [NSString stringWithFormat:@"%lld", seconds];
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}
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+ (NSString *)generateNonceWithLength:(NSUInteger)length {
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// 用 UUID 生成，去掉 - , 再截取前 length 位
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NSString *uuid = [[NSUUID UUID].UUIDString stringByReplacingOccurrencesOfString:@"-" withString:@""];
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if (length == 0 || length > uuid.length) {
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return uuid;
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}
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return [uuid substringToIndex:length];
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}
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@end
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