小红包花样短信 V4.0 算法分析
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软件简介
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小红包花样短信以前叫做诺基亚闪烁短信息。她能使您发送自己定制的闪烁、图片短信到诺基亚和西门子
手机！·支持一些西门子手机的图片短信·增强的短信编辑器·新增我的收藏夹，内附幽默短语200条·新增
简易电话号码簿·可自定义短信签名！
授权方式： 共享
下载地址：http://jshttp.skycn.net/down/redbagsms40_cn.zip
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破解者：青锋剑客
破解目的：获得注册码，做出注册机。
破解工具：fi2.5 fs regmon softice4.5 ollydbg1.07 tc2.0
破解过程：
1。用FI2.5检查程序的壳，是upx0.89-6-1.21,用fs脱壳。
2.先熟悉一下程序，调出注册界面，用户名输入shifeng，注册号输入87654321,点注册，让重新启动程序，
可以看出要验证注册码。
3.调出regmon,再次启动小红包，查出小红包要调用
HKEY_CURRENT_USER\Software\iRedBag\RedBag SMS\4.0\RegCode
4.CTRL+D调出SI，下断点bpx regqueryvalueexa if *(esp->8)=='RegC' do "d (esp->14)"
启动小红包中断，按一次F12，按若干次F10，当内存数据区显示87654321时，中断于4678E0,继续按F10
会来到4B246D。向上看，会来到这里。
004B243E BA 34294B00 MOV EDX,REDBAGSM.004B2934 ; ASCII "RegName"
004B2443 8B45 F8 MOV EAX,DWORD PTR SS:[EBP-8]
004B2446 E8 F152FBFF CALL REDBAGSM.0046773C
004B244B B9 1C294B00 MOV ECX,REDBAGSM.004B291C ; ASCII "UNREGISTERED"
004B2450 BA 44294B00 MOV EDX,REDBAGSM.004B2944 ; ASCII "RegCode"
004B2455 8B45 F8 MOV EAX,DWORD PTR SS:[EBP-8]
004B2458 E8 DF52FBFF CALL REDBAGSM.0046773C
004B245D 8D4D E0 LEA ECX,DWORD PTR SS:[EBP-20]
004B2460 BA 44294B00 MOV EDX,REDBAGSM.004B2944 ; ASCII "RegCode"
004B2465 8B45 F8 MOV EAX,DWORD PTR SS:[EBP-8]
004B2468 E8 FB52FBFF CALL REDBAGSM.00467768 ;取注册号
004B246D 8B45 E0 MOV EAX,DWORD PTR SS:[EBP-20]
004B2470 50 PUSH EAX
004B2471 8D4D DC LEA ECX,DWORD PTR SS:[EBP-24]
004B2474 BA 34294B00 MOV EDX,REDBAGSM.004B2934 ; ASCII "RegName"
004B2479 8B45 F8 MOV EAX,DWORD PTR SS:[EBP-8]
004B247C E8 E752FBFF CALL REDBAGSM.00467768 ；取用户名
004B2481 8B45 DC MOV EAX,DWORD PTR SS:[EBP-24]
004B2484 5A POP EDX
004B2485 E8 1AF4FFFF CALL REDBAGSM.004B18A4 ; 关键调用，计算注册码并验证
004B248A 84C0 TEST AL,AL
004B248C 74 2C JE SHORT REDBAGSM.004B24BA ; 跳则死
004B248E 8D4D D8 LEA ECX,DWORD PTR SS:[EBP-28]
004B2491 BA BC284B00 MOV EDX,REDBAGSM.004B28BC ; ASCII "Signature"
004B2496 8B45 F8 MOV EAX,DWORD PTR SS:[EBP-8]
004B2499 E8 CA52FBFF CALL REDBAGSM.00467768
004B249E 8B55 D8 MOV EDX,DWORD PTR SS:[EBP-28]
004B24A1 8B45 FC MOV EAX,DWORD PTR SS:[EBP-4]
5.为方便调试，启动ollydbg，CTRL+G输入4B246D，F2在此下断点。F8几次，进入关键调用：
004B18A4 55 PUSH EBP
004B18A5 8BEC MOV EBP,ESP
004B18A7 B9 0D000000 MOV ECX,0D
004B18AC 6A 00 PUSH 0
004B18AE 6A 00 PUSH 0
004B18B0 49 DEC ECX
004B18B1 ^75 F9 JNZ SHORT REDBAGSM.004B18AC
004B18B3 53 PUSH EBX
004B18B4 8955 F8 MOV DWORD PTR SS:[EBP-8],EDX
004B18B7 8945 FC MOV DWORD PTR SS:[EBP-4],EAX
004B18BA 8B45 FC MOV EAX,DWORD PTR SS:[EBP-4]
004B18BD E8 8631F5FF CALL REDBAGSM.00404A48
004B18C2 8B45 F8 MOV EAX,DWORD PTR SS:[EBP-8]
004B18C5 E8 7E31F5FF CALL REDBAGSM.00404A48
004B18CA 33C0 XOR EAX,EAX
004B18CC 55 PUSH EBP
004B18CD 68 E21B4B00 PUSH REDBAGSM.004B1BE2
004B18D2 64:FF30 PUSH DWORD PTR FS:[EAX]
004B18D5 64:8920 MOV DWORD PTR FS:[EAX],ESP
004B18D8 8B45 FC MOV EAX,DWORD PTR SS:[EBP-4] ；用户名
004B18DB E8 802FF5FF CALL REDBAGSM.00404860 ；用户名长度
004B18E0 83F8 03 CMP EAX,3
004B18E3 7D 07 JGE SHORT REDBAGSM.004B18EC ；用户名长度要大于3位
004B18E5 33DB XOR EBX,EBX
004B18E7 E9 DB020000 JMP REDBAGSM.004B1BC7
004B18EC 8B45 F8 MOV EAX,DWORD PTR SS:[EBP-8] ；注册码
004B18EF E8 6C2FF5FF CALL REDBAGSM.00404860 ；注册码长度
004B18F4 83F8 0F CMP EAX,0F
004B18F7 74 07 JE SHORT REDBAGSM.004B1900 ; 注册码长度为15，在此不跳则死
重新开始，注册码输入987654321012345
004B18F9 33DB XOR EBX,EBX
004B18FB E9 C7020000 JMP REDBAGSM.004B1BC7
004B1900 8D45 E4 LEA EAX,DWORD PTR SS:[EBP-1C]
004B1903 50 PUSH EAX
004B1904 B9 05000000 MOV ECX,5
004B1909 BA 01000000 MOV EDX,1
004B190E 8B45 F8 MOV EAX,DWORD PTR SS:[EBP-8] ；注册码
004B1911 E8 A231F5FF CALL REDBAGSM.00404AB8 ；取前五位
004B1916 8B45 E4 MOV EAX,DWORD PTR SS:[EBP-1C]
004B1919 BA F81B4B00 MOV EDX,REDBAGSM.004B1BF8 ; ASCII "RBSMS"
004B191E E8 8130F5FF CALL REDBAGSM.004049A4 ；与RBSMS比较，不等不跳
004B1923 74 07 JE SHORT REDBAGSM.004B192C ; 在此不跳则死，点Z标志使之跳
004B1925 33DB XOR EBX,EBX
004B1927 E9 9B020000 JMP REDBAGSM.004B1BC7
004B192C 8D45 DC LEA EAX,DWORD PTR SS:[EBP-24]
004B192F 50 PUSH EAX
004B1930 B9 02000000 MOV ECX,2
004B1935 BA 0D000000 MOV EDX,0D
004B193A 8B45 F8 MOV EAX,DWORD PTR SS:[EBP-8] ；取注册码
004B193D E8 7631F5FF CALL REDBAGSM.00404AB8 ；取注册码13，14位
004B1942 8B4D DC MOV ECX,DWORD PTR SS:[EBP-24]
004B1945 8D45 E0 LEA EAX,DWORD PTR SS:[EBP-20]
004B1948 BA 081C4B00 MOV EDX,REDBAGSM.004B1C08
004B194D E8 5A2FF5FF CALL REDBAGSM.004048AC
004B1952 8B45 E0 MOV EAX,DWORD PTR SS:[EBP-20]
004B1955 E8 EE73F5FF CALL REDBAGSM.00408D48
004B195A 8BD8 MOV EBX,EAX
004B195C 8B45 FC MOV EAX,DWORD PTR SS:[EBP-4]
004B195F E8 FC2EF5FF CALL REDBAGSM.00404860 ；取用户名长度
004B1964 3BD8 CMP EBX,EAX ；注册码13，14位与长度的16进制要相等
004B1966 74 07 JE SHORT REDBAGSM.004B196F ;不跳则死，点Z标志使之跳
004B1968 33DB XOR EBX,EBX
004B196A E9 58020000 JMP REDBAGSM.004B1BC7
004B196F 68 081C4B00 PUSH REDBAGSM.004B1C08
004B1974 8D45 D4 LEA EAX,DWORD PTR SS:[EBP-2C]
004B1977 50 PUSH EAX
004B1978 B9 01000000 MOV ECX,1
004B197D BA 0A000000 MOV EDX,0A ；注意EDX的A
004B1982 8B45 F8 MOV EAX,DWORD PTR SS:[EBP-8]
004B1985 E8 2E31F5FF CALL REDBAGSM.00404AB8 ；取注册码第10位到内存
004B198A FF75 D4 PUSH DWORD PTR SS:[EBP-2C]
004B198D 8D45 D0 LEA EAX,DWORD PTR SS:[EBP-30]
004B1990 50 PUSH EAX
004B1991 B9 01000000 MOV ECX,1
004B1996 BA 0C000000 MOV EDX,0C ；注意EDX的C
004B199B 8B45 F8 MOV EAX,DWORD PTR SS:[EBP-8]
004B199E E8 1531F5FF CALL REDBAGSM.00404AB8 ；取注册码第12位到内存
004B19A3 FF75 D0 PUSH DWORD PTR SS:[EBP-30]
004B19A6 8D45 D8 LEA EAX,DWORD PTR SS:[EBP-28]
004B19A9 BA 03000000 MOV EDX,3
004B19AE E8 6D2FF5FF CALL REDBAGSM.00404920 ；把这两位拼合后送入SS:[EBP-28]
004B19B3 8B45 D8 MOV EAX,DWORD PTR SS:[EBP-28]
004B19B6 E8 8D73F5FF CALL REDBAGSM.00408D48
004B19BB 8BD0 MOV EDX,EAX
004B19BD 8D45 F4 LEA EAX,DWORD PTR SS:[EBP-C]
004B19C0 E8 C32DF5FF CALL REDBAGSM.00404788
004B19C5 8D45 CC LEA EAX,DWORD PTR SS:[EBP-34]
004B19C8 50 PUSH EAX
004B19C9 B9 01000000 MOV ECX,1
004B19CE BA 01000000 MOV EDX,1
004B19D3 8B45 FC MOV EAX,DWORD PTR SS:[EBP-4] ；用户名
004B19D6 E8 DD30F5FF CALL REDBAGSM.00404AB8 ；用户名第一个字符送入内存
004B19DB 8B55 CC MOV EDX,DWORD PTR SS:[EBP-34]
004B19DE 8B45 F4 MOV EAX,DWORD PTR SS:[EBP-C]
004B19E1 E8 BE2FF5FF CALL REDBAGSM.004049A4 ; SN第10，12位组成的数与用户名第一个字符比较 ?
004B19E6 74 0F JE SHORT REDBAGSM.004B19F7 ; 不跳则死，点Z标志使之跳
004B19E8 33DB XOR EBX,EBX
004B19EA 8D45 F4 LEA EAX,DWORD PTR SS:[EBP-C]
004B19ED E8 B62BF5FF CALL REDBAGSM.004045A8
004B19F2 E9 D0010000 JMP REDBAGSM.004B1BC7
004B19F7 8D45 F4 LEA EAX,DWORD PTR SS:[EBP-C]
004B19FA E8 A92BF5FF CALL REDBAGSM.004045A8
004B19FF 68 081C4B00 PUSH REDBAGSM.004B1C08
004B1A04 8D45 C4 LEA EAX,DWORD PTR SS:[EBP-3C]
004B1A07 50 PUSH EAX
004B1A08 B9 01000000 MOV ECX,1
004B1A0D BA 08000000 MOV EDX,8
004B1A12 8B45 F8 MOV EAX,DWORD PTR SS:[EBP-8]
004B1A15 E8 9E30F5FF CALL REDBAGSM.00404AB8 ; 取SN第8位
004B1A1A FF75 C4 PUSH DWORD PTR SS:[EBP-3C]
004B1A1D 8D45 C0 LEA EAX,DWORD PTR SS:[EBP-40]
004B1A20 50 PUSH EAX
004B1A21 B9 01000000 MOV ECX,1
004B1A26 BA 0B000000 MOV EDX,0B
004B1A2B 8B45 F8 MOV EAX,DWORD PTR SS:[EBP-8]
004B1A2E E8 8530F5FF CALL REDBAGSM.00404AB8 ; 取SN第11位
004B1A33 FF75 C0 PUSH DWORD PTR SS:[EBP-40]
004B1A36 8D45 C8 LEA EAX,DWORD PTR SS:[EBP-38]
004B1A39 BA 03000000 MOV EDX,3
004B1A3E E8 DD2EF5FF CALL REDBAGSM.00404920
004B1A43 8B45 C8 MOV EAX,DWORD PTR SS:[EBP-38]
004B1A46 E8 FD72F5FF CALL REDBAGSM.00408D48
004B1A4B 8BD0 MOV EDX,EAX
004B1A4D 8D45 F0 LEA EAX,DWORD PTR SS:[EBP-10]
004B1A50 E8 332DF5FF CALL REDBAGSM.00404788 ; 两位生成字符
004B1A55 8D45 B8 LEA EAX,DWORD PTR SS:[EBP-48]
004B1A58 50 PUSH EAX
004B1A59 B9 01000000 MOV ECX,1
004B1A5E BA 07000000 MOV EDX,7
004B1A63 8B45 F8 MOV EAX,DWORD PTR SS:[EBP-8]
004B1A66 E8 4D30F5FF CALL REDBAGSM.00404AB8 ; 取SN第7个字符
004B1A6B 8B45 B8 MOV EAX,DWORD PTR SS:[EBP-48]
004B1A6E 8D55 BC LEA EDX,DWORD PTR SS:[EBP-44]
004B1A71 E8 026EF5FF CALL REDBAGSM.00408878
004B1A76 8B45 BC MOV EAX,DWORD PTR SS:[EBP-44]
004B1A79 50 PUSH EAX
004B1A7A 8D55 B4 LEA EDX,DWORD PTR SS:[EBP-4C]
004B1A7D 8B45 F0 MOV EAX,DWORD PTR SS:[EBP-10]
004B1A80 E8 F36DF5FF CALL REDBAGSM.00408878
004B1A85 8B55 B4 MOV EDX,DWORD PTR SS:[EBP-4C]
004B1A88 58 POP EAX
004B1A89 E8 162FF5FF CALL REDBAGSM.004049A4 ; 上面两数比较，相等则跳。
004B1A8E 74 0F JE SHORT REDBAGSM.004B1A9F ; 不跳则死
004B1A90 8D45 F0 LEA EAX,DWORD PTR SS:[EBP-10]
004B1A93 E8 102BF5FF CALL REDBAGSM.004045A8
004B1A98 33DB XOR EBX,EBX
004B1A9A E9 28010000 JMP REDBAGSM.004B1BC7
004B1A9F 8D45 B0 LEA EAX,DWORD PTR SS:[EBP-50]
004B1AA2 50 PUSH EAX
004B1AA3 8B45 FC MOV EAX,DWORD PTR SS:[EBP-4]
004B1AA6 E8 B52DF5FF CALL REDBAGSM.00404860
004B1AAB 8BD0 MOV EDX,EAX
004B1AAD 4A DEC EDX
004B1AAE B9 01000000 MOV ECX,1
004B1AB3 8B45 FC MOV EAX,DWORD PTR SS:[EBP-4]
004B1AB6 E8 FD2FF5FF CALL REDBAGSM.00404AB8 ; 读用户名倒数第二个字符并保存
004B1ABB 8B55 B0 MOV EDX,DWORD PTR SS:[EBP-50] ; EDX指向的是前面SN第8位、11位生成的字符
004B1ABE 8B45 F0 MOV EAX,DWORD PTR SS:[EBP-10]
004B1AC1 E8 DE2EF5FF CALL REDBAGSM.004049A4
004B1AC6 74 0F JE SHORT REDBAGSM.004B1AD7 ；相等跳，不跳死
004B1AC8 8D45 F0 LEA EAX,DWORD PTR SS:[EBP-10]
004B1ACB E8 D82AF5FF CALL REDBAGSM.004045A8
004B1AD0 33DB XOR EBX,EBX
004B1AD2 E9 F0000000 JMP REDBAGSM.004B1BC7
004B1AD7 8D45 E8 LEA EAX,DWORD PTR SS:[EBP-18]
004B1ADA 8B55 F8 MOV EDX,DWORD PTR SS:[EBP-8]
004B1ADD 0FB652 0E MOVZX EDX,BYTE PTR DS:[EDX+E] ; 序列号最后一位
004B1AE1 4A DEC EDX ; 减一
004B1AE2 E8 A12CF5FF CALL REDBAGSM.00404788
004B1AE7 8D55 AC LEA EDX,DWORD PTR SS:[EBP-54]
004B1AEA 8B45 E8 MOV EAX,DWORD PTR SS:[EBP-18]
004B1AED E8 866DF5FF CALL REDBAGSM.00408878
004B1AF2 8B45 AC MOV EAX,DWORD PTR SS:[EBP-54]
004B1AF5 50 PUSH EAX
004B1AF6 8D55 A8 LEA EDX,DWORD PTR SS:[EBP-58]
004B1AF9 8B45 F0 MOV EAX,DWORD PTR SS:[EBP-10]
004B1AFC E8 776DF5FF CALL REDBAGSM.00408878
004B1B01 8B55 A8 MOV EDX,DWORD PTR SS:[EBP-58] ；EDX指向的是前面用户名倒数第2个字符
004B1B04 58 POP EAX
004B1B05 E8 9A2EF5FF CALL REDBAGSM.004049A4 ；两者比较，相等跳，不跳死
004B1B0A 74 17 JE SHORT REDBAGSM.004B1B23
004B1B0C 8D45 F0 LEA EAX,DWORD PTR SS:[EBP-10]
004B1B0F E8 942AF5FF CALL REDBAGSM.004045A8
004B1B14 8D45 E8 LEA EAX,DWORD PTR SS:[EBP-18]
004B1B17 E8 8C2AF5FF CALL REDBAGSM.004045A8
004B1B1C 33DB XOR EBX,EBX
004B1B1E E9 A4000000 JMP REDBAGSM.004B1BC7
004B1B23 8D45 F0 LEA EAX,DWORD PTR SS:[EBP-10]
004B1B26 E8 7D2AF5FF CALL REDBAGSM.004045A8
004B1B2B 8D45 E8 LEA EAX,DWORD PTR SS:[EBP-18]
004B1B2E E8 752AF5FF CALL REDBAGSM.004045A8
004B1B33 68 081C4B00 PUSH REDBAGSM.004B1C08
004B1B38 8D45 A0 LEA EAX,DWORD PTR SS:[EBP-60]
004B1B3B 50 PUSH EAX
004B1B3C B9 01000000 MOV ECX,1
004B1B41 BA 06000000 MOV EDX,6
004B1B46 8B45 F8 MOV EAX,DWORD PTR SS:[EBP-8]
004B1B49 E8 6A2FF5FF CALL REDBAGSM.00404AB8 ；取SN第6位
004B1B4E FF75 A0 PUSH DWORD PTR SS:[EBP-60]
004B1B51 8D45 9C LEA EAX,DWORD PTR SS:[EBP-64]
004B1B54 50 PUSH EAX
004B1B55 B9 01000000 MOV ECX,1
004B1B5A BA 09000000 MOV EDX,9
004B1B5F 8B45 F8 MOV EAX,DWORD PTR SS:[EBP-8]
004B1B62 E8 512FF5FF CALL REDBAGSM.00404AB8 ； 取SN第9位
004B1B67 FF75 9C PUSH DWORD PTR SS:[EBP-64]
004B1B6A 8D45 A4 LEA EAX,DWORD PTR SS:[EBP-5C]
004B1B6D BA 03000000 MOV EDX,3
004B1B72 E8 A92DF5FF CALL REDBAGSM.00404920 ；两者合并成字符
004B1B77 8B45 A4 MOV EAX,DWORD PTR SS:[EBP-5C]
004B1B7A E8 C971F5FF CALL REDBAGSM.00408D48
004B1B7F 8BD0 MOV EDX,EAX
004B1B81 8D45 EC LEA EAX,DWORD PTR SS:[EBP-14]
004B1B84 E8 FF2BF5FF CALL REDBAGSM.00404788
004B1B89 8D45 98 LEA EAX,DWORD PTR SS:[EBP-68]
004B1B8C 50 PUSH EAX
004B1B8D 8B45 FC MOV EAX,DWORD PTR SS:[EBP-4]
004B1B90 E8 CB2CF5FF CALL REDBAGSM.00404860
004B1B95 8BD0 MOV EDX,EAX
004B1B97 B9 01000000 MOV ECX,1
004B1B9C 8B45 FC MOV EAX,DWORD PTR SS:[EBP-4]
004B1B9F E8 142FF5FF CALL REDBAGSM.00404AB8 ；取用户名最后一字符
004B1BA4 8B55 98 MOV EDX,DWORD PTR SS:[EBP-68]
004B1BA7 8B45 EC MOV EAX,DWORD PTR SS:[EBP-14]
004B1BAA E8 F52DF5FF CALL REDBAGSM.004049A4
004B1BAF 74 0C JE SHORT REDBAGSM.004B1BBD ；两比较，相等跳，不跳死
004B1BB1 8D45 EC LEA EAX,DWORD PTR SS:[EBP-14]
004B1BB4 E8 EF29F5FF CALL REDBAGSM.004045A8
004B1BB9 33DB XOR EBX,EBX
004B1BBB EB 0A JMP SHORT REDBAGSM.004B1BC7
004B1BBD 8D45 EC LEA EAX,DWORD PTR SS:[EBP-14]
004B1BC0 E8 E329F5FF CALL REDBAGSM.004045A8
004B1BC5 B3 01 MOV BL,1
004B1BC7 33C0 XOR EAX,EAX
004B1BC9 5A POP EDX
004B1BCA 59 POP ECX
004B1BCB 59 POP ECX
004B1BCC 64:8910 MOV DWORD PTR FS:[EAX],EDX
004B1BCF 68 E91B4B00 PUSH REDBAGSM.004B1BE9
004B1BD4 8D45 98 LEA EAX,DWORD PTR SS:[EBP-68]
004B1BD7 BA 1A000000 MOV EDX,1A
004B1BDC E8 EB29F5FF CALL REDBAGSM.004045CC
004B1BE1 C3 RETN
5.算法总结
（1）前五位是固定的,为RBSMS
（2）第6、第9位组合成用户名最后一个字符的ASCII码
（3）第7位是用户名倒数第2个字符
（4）第8位、11位是用户倒数第2个字符的ASCII码
（5）第10位、12位是用户名的第1个字符的ASCII码
（6）第13、14位是用户名长度（以十六进制表示的）
（7）最后一位是用户名倒数第2位字母加1
6.delphi注册机的主要部分：
var
username:string;
l:integer;
begin
username:=Edituser.text;
l:=length(username);
if l>2 then
begin
editsn.Text :='RBSMS';
editsn.Text := editsn.Text+inttohex(ord(username[l]) div 16,1);
editsn.Text := editsn.Text+username[l-1];
editsn.Text := editsn.Text+inttohex(ord(username[l-1]) div 16,1);
editsn.Text := editsn.Text+inttohex(ord(username[l]) mod 16,1);
editsn.Text := editsn.Text+inttohex(ord(username[1]) div 16,1);
editsn.Text := editsn.Text+inttohex(ord(username[l-1]) mod 16,1);
editsn.Text := editsn.Text+inttohex(ord(username[1]) mod 16,1);
editsn.Text := editsn.Text+inttohex(l,2);
editsn.Text := editsn.Text+upcase(chr(ord(username[l-1])+1));
end
else
Edituser.text:='用户名长度不得小于3个英文字符';
end;
7.相应TC注册机源码：
#include
void main(void)
{
char *str;
int len;
clrscr();
printf("\n\n\n**********************************************************\n");
printf(" 小红包花样短信 XP V4.0 注册机\n");
printf(" 作者: 青锋剑客 ( 2002/10/23 )\n");
printf(" 用户名长度不能小于3位且不能为汉字\n");
printf("**********************************************************\n\n");
printf("请输入你的姓名 : ");
gets(str);
len=strlen(str);
printf("\n你的序列号为：RBSMS");
printf("%X",str[len-1]/16);
printf("%c",str[len-2]);
printf("%X",str[len-2]/16);
printf("%X",str[len-1]%16);
printf("%X",str[0]/16);
printf("%X",str[len-2]%16);
printf("%X",str[0]%16);
if (len<16) printf("0");
printf("%X",len);
printf("%c\n",toupper(str[len-2]+1));
}
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