ios - 带重音的字符串会导致 SHA256 加密崩溃

Question

我想从字符串创建哈希。如果字符串有带重音的字符（如 é、ő），它会因 NSASCIIStringEncoding 崩溃。它不会与 NSUTF8StringEncoding 崩溃，但在服务器上它不匹配。

+(NSString *) getSHA256FromString: (NSString *)clear {

    const char *s=[clear cStringUsingEncoding: NSASCIIStringEncoding];// NSUTF8StringEncoding works, but isn't the same on server
    NSData *keyData=[NSData dataWithBytes:s length:strlen(s)];

    uint8_t digest[CC_SHA256_DIGEST_LENGTH]={0};
    CC_SHA256(keyData.bytes, keyData.length, digest);
    NSData *out=[NSData dataWithBytes:digest length:CC_SHA256_DIGEST_LENGTH];
    NSString *hash=[out description];
    hash = [hash stringByReplacingOccurrencesOfString:@" " withString:@""];
    hash = [hash stringByReplacingOccurrencesOfString:@"<" withString:@""];
    hash = [hash stringByReplacingOccurrencesOfString:@">" withString:@""];
    return hash;

}