app2dylib
A reverse engineering tool to convert iOS app to dylib
Usage
git clone --recursive https://github.com/tobefuturer/app2dylib.git
cd app2dylib && make
./app2dylib
example :
./app2dylib /tmp/AlipayWallet -o /tmp/libAlipayApp.dylib
You can use libAlipayApp.dylib as a normal dynamic library.
Call OC method or call C function like this:
#import <UIKit/UIKit.h>
#import <dlfcn.h>
#import <mach/mach.h>
#import <mach-o/loader.h>
#import <mach-o/dyld.h>
int main(int argc, char * argv[]) {
NSString * dylibName = @"libAlipayApp";
NSString * path = [[NSBundle mainBundle] pathForResource:dylibName ofType:@"dylib"];
if (dlopen(path.UTF8String, RTLD_NOW) == NULL){
NSLog(@"dlopen failed ，error %s", dlerror());
return 0;
};
uint32_t dylib_count = _dyld_image_count();
uint64_t slide = 0;
for (int i = 0; i < dylib_count; i ++) {
const char * name = _dyld_get_image_name(i);
if ([[NSString stringWithUTF8String:name] isEqualToString:path]) {
slide = _dyld_get_image_vmaddr_slide(i);
}
}
assert(slide != 0);
Class c = NSClassFromString(@"aluSecurity");
NSString * plain = @"alipay";
NSString * pubkey = @"MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDZ6i9VNEGEaZaYE7XffA9XRj15cp/ZKhHYY43EEva8LIhCWi29EREaF4JjZVMwFpUAfrL+9gpA7NMQmaMRHbrz1KHe2Ho4HpUhEac8M9zUbNvaDKSlhx0lq/15TQP+57oQbfJ9oKKd+he4Yd6jpBI3UtGmwJyN/T1S0DQ0aXR8OQIDAQAB";
NSString * cipher = [c performSelector:NSSelectorFromString(@"rsaEncryptText:pubKey:") withObject:plain withObject:pubkey];
NSLog(@"ciphertext： %@", cipher);
typedef int (*BASE64_ENCODE_FUNC_TYPE) (char * output, int * output_size , char * input, int input_length);
/** get function pointer*/
BASE64_ENCODE_FUNC_TYPE base64_encode = (BASE64_ENCODE_FUNC_TYPE)(slide + 0xa798e4);
char output[1000] = {0};
int length = 1000;
char * input = "alipay";
base64_encode(output, & length, input, (int)strlen(input));
NSLog(@"base64 length: %d , %s", length, output);
}