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Aes 16 Byte Key Generator
Generating a secure AES key? Ask Question. It's true that 16 bytes can fit 128 bits, but that only holds for data where all possible byte values are (equally) possible. Text consisting of characters is all but that. If you want to generate a random key, pull bytes out a strong random bit generator. AES is a block cipher, it works on 16-byte (128-bit) blocks. AES, on its own, can't work with data smaller or bigger than 16 bytes. Smaller data needs to be padded until they're 16 bytes, and larger data needs to be split into 16-byte blocks (and, of course, padded when needed.).
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Advanced Encryption Standard(AES) is a symmetric encryption algorithm. AES is the industry standard as of now as it allows 128 bit, 192 bit and 256 bit encryption.Symmetric encryption is very fast as compared to asymmetric encryption and are used in systems such as database system. Following is an online tool to generate AES encrypted password and decrypt AES encrypted password. It provides two mode of encryption and decryption ECB and CBC mode. For more info on AES encryption visit this explanation on AES Encryption.
Also, you can find the sample usage screenshot below:
- What is AES encryption? AES (acronym of Advanced Encryption Standard) is a symmetric encryption algorithm. The algorithm was developed by two Belgian cryptographer Joan Daemen and Vincent Rijmen. AES was designed to be efficient in both hardware and software, and supports a block length of 128 bits and key lengths of 128, 192, and 256 bits.
- The key should be the only part of the algorithm that it is necessary to keep secret. The key length is usually expressed in bits, 8 bits to one byte. Bytes are a more convenient form for storing and representing keys because most computer systems use a byte as the smallest unit of storage (the strict term for an 8-bit byte is octet).
- Generating a secure AES key? Ask Question. It's true that 16 bytes can fit 128 bits, but that only holds for data where all possible byte values are (equally.
- Random Byte Generator. This form allows you to generate random bytes. The randomness comes from atmospheric noise, which for many purposes is better than the pseudo-random number algorithms typically used in computer programs.
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Usage Guide
Any plain-text input or output that you enter or we generate is not stored on this site, this tool is provided via an HTTPS URL to ensure that text cannot be stolen.
For encryption, you can either enter the plain text, password, an image file or a .txt file that you want to encrypt. Now choose the block cipher mode of encryption. ECB(Electronic Code Book) is the simplest encryption mode and does not require IV for encryption. The input plain text will be divided into blocks and each block will be encrypted with the key provided and hence identical plain text blocks are encrypted into identical cipher text blocks. CBC mode is highly recommended and it requires IV to make each message unique. If no IV is entered then default will be used here for CBC mode and that defaults to a zero based byte[16].
The AES algorithm has a 128-bit block size, regardless of whether you key length is 256, 192 or 128 bits. When a symmetric cipher mode requires an IV, the length of the IV must be equal to the block size of the cipher. Hence, you must always use an IV of 128 bits (16 bytes) with AES.
AES provides 128 bit, 192 bit and 256 bit of secret key size for encryption. Things to remember here is if you are selecting 128 bits for encryption, then the secret key must be of 16 bits long and 24 and 32 bits for 192 and 256 bits of key size. Now you can enter the secret key accordingly. By default, the encrypted text will be base64 encoded but you have options to select the output format as HEX too.
Similarly, for image and .txt file the encrypted form will be Base64 encoded.
Below is a screenshot that shows a sample usage of this online AES encryption tool.
AES decryption has also the same process. By default it assumes the entered text be in Base64. The input can be Base64 encoded or Hex encoded image and .txt file too. And the final decrypted output will be Base64 string. If the intended output is a plain-text then, it can be decoded to plain-text in-place.
But if the intended output is an image or .txt file then you can use this tool to convert the base64 encoded output to an image.
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- 10Endianness and word order
- 13Keyslots
Registers[edit]
| Old3DS | Name | Address | Width | RW |
|---|---|---|---|---|
| Yes | AES_CNT | 0x10009000 | 4 | RW |
| Yes | AES_MACBLKCNT | 0x10009004 | 2 | W |
| Yes | AES_BLKCNT | 0x10009006 | 2 | W |
| Yes | AES_WRFIFO | 0x10009008 | 4 | W |
| Yes | AES_RDFIFO | 0x1000900C | 4 | R |
| Yes | AES_KEYSEL | 0x10009010 | 1 | RW |
| Yes | AES_KEYCNT | 0x10009011 | 1 | RW |
| Yes | AES_CTR | 0x10009020 | 16 | W |
| Yes | AES_MAC | 0x10009030 | 16 | W |
| Yes | AES_KEY0 | 0x10009040 | 48 | W |
| Yes | AES_KEY1 | 0x10009070 | 48 | W |
| Yes | AES_KEY2 | 0x100090A0 | 48 | W |
| Yes | AES_KEY3 | 0x100090D0 | 48 | W |
| Yes | AES_KEYFIFO | 0x10009100 | 4 | W |
| Yes | AES_KEYXFIFO | 0x10009104 | 4 | W |
| Yes | AES_KEYYFIFO | 0x10009108 | 4 | W |
AES_CNT[edit]
| Bit | Description |
|---|---|
| 4-0 | Write FIFO count (0-16) |
| 9-5 | Read FIFO count (0-16) |
| 10 | Flush write FIFO (1=Clear write FIFO) |
| 11 | Flush read fifo (1=Clear read FIFO) |
| 12-13 | Write FIFO DMA size (0=16, 1=12, 2=8, 3=4 words) |
| 14-15 | Read FIFO DMA size (0=4, 1=8, 2=12, 3=16 words) |
| 18-16 | MAC size (encoding = (maclen-2)/2) |
| 19 | ? (MAC related) |
| 20 | MAC input control (0 = read MAC from FIFO, 1 = read from MAC register) |
| 21 | MAC status (0 = invalid, 1 = verified) |
| 22 | Output endianness (1=Big endian, 0=Little endian) |
| 23 | Input endianness (1=Big endian, 0=Little endian) |
| 24 | Output word order (1=Normal order, 0=Reversed order) |
| 25 | Input word order (1=Normal order, 0=Reversed order) |
| 26 | Update keyslot (selects the keyslot specified by AES_KEYSEL when this bit is set) |
| 29-27 | Mode (0=CCM decrypt, 1=CCM encrypt, 2=CTR, 3=CTR, 4=CBC decrypt, 5=CBC encrypt, 6=ECB decrypt, 7=ECB encrypt) |
| 30 | Interrupt enable (1=enable, 0=disable) |
| 31 | Start (1=enable/busy, 0=idle) |
When bit31 is set, this register essentially becomes locked and doesn't change when written to. However if bit26 is 'set', keyslot-selection is cued to be handled when bit31 is cleared.
Clearing bit31 while the AES engine is doing crypto will result in the AES engine stopping crypto, once it finishes processing the current block.
Read/Write FIFO counts and the MAC status can never be set by writing to AES_CNT, they are read-only.
Changing the input word order triggers the key/keyX/keyY FIFOs to be flushed.
AES_MACEXTRABLKCNT[edit]
(CCM-MAC extra data length)>>4, i.e. the number of block of CCM-MAC extra data.
AES_BLKCNT[edit]
(Data length)>>4, i.e. the number of blocks to process
AES_WRFIFO/AES_RDFIFO[edit]
The AES engine can accept up to 64 bytes of input data (16 32-bit words) and can hold up to 64 bytes of output data at a time (for a total of 128 bytes of buffered data). Bits 12-13 and 14-15 in AES_CNT configure the DMA request for the relevant FIFO (see above).
The input data for the AES crypto operation is written to AES_WRFIFO, the output data is read from AES_RDFIFO.
Reading from AES_RDFIFO when there's no data available in the RDFIFO will result in reading the last word that was in the RDFIFO.
When triggering either RDFIFO or WRFIFO to be flushed, the AES Engine does not clear either buffer.
Word order and endianness can be changed between each read/write to these FIFOs. However changing the word order when writing to WRFIFO can cause the word to be written outside the current block, leaving uninitialized data in its place. Attempts to change endianness or word order are not honored when reading from RDFIFO when no more data is available.
AES_KEYCNT[edit]
| Bit | Description |
|---|---|
| 5-0 | Keyslot |
| 6 | Hardware key-generator type: 0 = 3DS, 1 = DSi. |
| 7 | This normally has value 1 written here when updating keys. 0 = disable key FIFO flush, 1 = enable key FIFO flush. |
Bit6 is only used when keyslots >=4 are used, value1 has the same affect as doing key-init with the TWL keyslots. Bit6 is only checked when a keyY was completely written, for when the final-normalkey needs updated via the key-generator. Changing bit6 has no affect on the generated normalkey when writing to this bit immediately after writing the last keyY word.
AES_CTR[edit]
This register specifies the counter (CTR mode), nonce (CCM mode) or the initialization vector (CBC mode) depending on the mode of operation.For CBC and CTR mode this register takes up the full 16 bytes, but for CCM mode the nonce is only the first 12 bytes.The AES engine will automatically increment the counter up to the maximum BLKCNT, after which point it must be manually incremented and set again.
AES_MAC[edit]
This register specifies the message authentication code (MAC) for use in CCM mode.
AES_KEY0/1/2/3[edit]
These registers are the same as they were on TWL, and are likely preserved for compatibility reasons. The keyslot is updated immediately after *any* data(u8/u32/..) is written here, which was used on DSi to break the key-generator.
Endianness and word order[edit]
AES_CNT.input_endianness[edit]
Swaps the bytes of 32-bit writes to AES_CTR, AES_WRFIFO, AES_KEY*FIFO according to specified endianness. AES_MAC?
AES_CNT.output_endianness[edit]
Swaps the bytes of 32-bit reads from AES_RDFIFO.
AES_CNT.input_word_order[edit]
If reversed, writes to AES_KEY*FIFO and AES_WRFIFO fill the FIFO backwards. For AES_WRFIFO, this means that every 16-byte block will have its words in the reverse order, but the order of these blocks remains the same. AES_CTR is unaffected by this field. AES_MAC?
16 Byte Hexadecimal
AES_CNT.output_word_order[edit]
If reversed, reads from AES_RDFIFO will drain the FIFO backwards. This means that every 16-byte output block will have its words in the reverse order, but the order of these blocks remains the same.
CCM mode pitfall[edit]
Non-standard AES-CCM behaviour is observed on Wrap/Unwrap function. According to RFC 3610, the first block B_0 for authentication should be generated from the message length and some other parameters. Using these function, it seems that the message length is aligned up to 16 when generating B_0. This makes the generated MAC not compliant with the standard when (inputsize-noncesize)%16!=0. It is very likely that this non-standard behaviour happens on the hardware level, but not confirmed yet.
Keyslot ranges[edit]
This is approximately a table of what is set by bootrom before booting into FIRM. Often it appears that keyslots in groups of 4 have the same keyX, and sometimes also same keyY set.
| Byte | Description |
|---|---|
| 0-15 | Normalkey |
| 16-31 | KeyX |
| 32-47 | KeyY |
| Keyslot | Name | KeyX | KeyY/Normal-key | Console unique. |
|---|---|---|---|---|
| 0x00-0x03 | TWL keys. | Probably unset. | Probably unset. | - |
| 0x04-0x07 | NAND partition keys. | Same for all. | Different for all. | Yes |
| 0x08-0x0B | See below. | Same for all. | Different for all. | Yes |
| 0x0C-0x0F | SSL cert key. | Same for all. | Same for all, normalkeys-only. | The keyXs are console-unique, however the normalkeys setup by Boot9 later during keyinit are not console-unique. |
| 0x10-0x17 | - | Set for all except 0x11.0x13. Keydata is different for these. | Normalkey, same for all except the last 4 are all different. | - |
| 0x18-0x1B | Never used. | Same for all. | Same for all, normalkeys-only. | The keyXs are console-unique, however the normalkeys setup by Boot9 later during keyinit are not console-unique. |
| 0x1C-0x1F | Never used. | Same for all. | Same for all, normalkeys-only. | The keyXs are console-unique, however the normalkeys setup by Boot9 later during keyinit are not console-unique. |
| 0x20-0x23 | Never used. | Same for all. | Same for all, normalkeys-only. | The keyXs are console-unique, however the normalkeys setup by Boot9 later during keyinit are not console-unique. |
| 0x24 | Never used. | Individually set. | Individually set, normalkey-only. | The keyX is console-unique, however the normalkey setup by Boot9 later during keyinit is not console-unique. |
| 0x25-0x27 | - | Not set. | Same for all, normalkeys-only. Same keydata as keyslot 0x24. | No |
| 0x28-0x2B | Never used. | Individually set. | Individually set, normalkeys-only. Keyslot 0x28 has same normalkey as keyslot 0x24. | The keyX is console-unique, however the normalkey setup by Boot9 later during keyinit is not console-unique. |
| 0x2C-0x2F | Various uniques. | Same for all. | Same for all, normalkeys-only. | No |
| 0x30-0x33 | Various uniques. | Same for all. | Same for all, normalkeys-only. | No |
| 0x34-0x37 | Various uniques. | Same for all. | Same for all, normalkeys-only. | No |
| 0x38-0x3B | Various uniques. | Same for all. | Same for all, normalkeys-only. | No |
| 0x3C-0x3F | Various uniques. | Individually set. | Individually set, normalkeys-only. Keyslot 0x3C has same normalkey as 0x38-0x3B. | No |
Keyslot pairs (0x24, 0x28) and (0x38, 0x3C) shares the same normal-key, while at the same time having different keyX's. This suggests they were set to same normal-key by bootrom.
Keyslots[edit]
There are 0x40 keyslots, each of which stores three keys called keyX, keyY and normalkey. All keys can be set explicitly, but the normalkey can optionally be generated using a hardware key generator instead (see below). There is no way to read the contents of a keyslot.
| Keyslot | Description | KeyX set by | KeyY set by | Normal-key | Old3DS |
|---|---|---|---|---|---|
| 0x00-0x03 | TWL keys. | NATIVE_FIRM hard-boot. | NATIVE_FIRM hard-boot. | - | Yes |
| 0x04.0x07 | NAND partition keys. Keyslot is determined by NCSD partition FS type and encryption type. The New3DS Process9 sets the keyY for keyslot 0x05 (New3DS CTRNAND) to a key from .(ro)data. Its keyX is console-unique and set by the bootloader. | Bootrom. | Bootrom. | - | Yes |
| 0x0A | DSiWare export key. Used for encrypting the all-zero 0x10-byte block in the DSiWare_Exports header. Console-unique. | See above keyslot info. | See above keyslot info. | - | Yes |
| 0x0B | This is console-unique. This keyslot is used for the NAND dbs images AES-CMACs, and the Nand/private/movable.sed AES-CMAC(when used). | See above keyslot info. | See above keyslot info. | - | Yes |
| 0x0D | SSL-certificate key. See EncryptDecryptAes. | - | - | Bootrom. | Yes |
| 0x11 | Temporary keyslot. Used by FIRM for general normal-key crypto. Also used by the New3DS FIRM arm9 binary loader. | Arm9Loader. | Arm9Loader. | NATIVE_FIRM. | Yes |
| 0x14 | Starting with 5.0.0-11, NATIVE_FIRM Process9 now sets the keyY for this to the same one it uses for initializing 3 of the keyslots' keyYs from here. | Bootrom. | NATIVE_FIRM boot. | - | Yes |
| 0x15 | Used/initialized by the New3DS arm9 binary loader, see here. | Arm9Loader. | Arm9Loader. | See previous info for this keyslot. | No |
| 0x16 | Used/initialized by the New3DS arm9 binary loader starting with 9.5.0-X, see here. | Arm9Loader. | Arm9Loader. | See previous info for this keyslot. | No |
| 0x18.0x1F | These are the New3DS keyslots, where the keyX is generated with keyslot 0x11 by the New3DS arm9 binary loader. As of FIRM9.6.0-X keyslots 0x1C.0x1F are not yet used by Process9. | Arm9Loader. | NATIVE_FIRM / see previous info for these keyslots. | See previous info for these keyslots. | No |
| 0x18 | New3DS 9.3.0-XNCCH key, when ncchflag[3] is 0x0A. | Arm9Loader. | NATIVE_FIRM | - | No |
| 0x19 | New3DS gamecard savedata AES-CMAC key. Equivalent of keyslot 0x33, used when a NCSD flag is set to a certain value (implemented with 9.3.0-X). | Arm9Loader. | NATIVE_FIRM | - | No |
| 0x1A | New3DS gamecard savedata actual key. Equivalent of keyslot 0x37, used when a NCSD flag is set to a certain value (implemented with 9.3.0-X). | Arm9Loader. | NATIVE_FIRM | - | No |
| 0x1B | New3DS 9.6.0-XNCCH key, when ncchflag[3] is 0x0B. | Arm9Loader. | NATIVE_FIRM | - | No |
| 0x24 | AGB_FIRM savegame AES-CMAC key. | Bootrom. | AGB/NATIVE_FIRM. | - | Yes |
| 0x25 | v7.0NCCH key, when ncchflag[3] is 0x01. | NATIVE_FIRM boot. | NATIVE_FIRM. | - | Yes |
| 0x2C | Original NCCH key, when ncchflag[3] is 0x00 and always for certain NCCH sections. | Bootrom. | Process9. | - | Yes |
| 0x2D | UDS local-WLAN CCMP key. See EncryptDecryptAes. | Bootrom. | Bootrom. | - | Yes |
| 0x2E | Streetpass key. See EncryptDecryptAes. | Bootrom. | NATIVE_FIRM. | - | Yes |
| 0x2F | v6.0 save key. | Bootrom. | NATIVE_FIRM. | - | Yes |
| 0x30 | SD/NAND AES-CMAC key. This keyY is initialized via movable.sed. This is used for calculating the AES-CMACs under SD /Nintendo 3DS/<ID0>/<ID1>/ (except DSiWare_Exports) and NAND /data/. | Bootrom. | NATIVE_FIRM. | - | Yes |
| 0x31 | APT wrap key. See EncryptDecryptAes. NATIVE_FIRM sets this keyY to the same one used for keyslot 0x2E. | Bootrom. | NATIVE_FIRM. | - | Yes |
| 0x32 | Unknown. See EncryptDecryptAes. | Bootrom. | Bootrom. | - | Yes |
| 0x33 | Gamecard savedata AES-CMAC. | Bootrom. | NATIVE_FIRM. | - | Yes |
| 0x34 | SD key. This keyY is initialized via movable.sed. This is used for encrypting *all* SD card data under /Nintendo 3DS/<ID0>/<ID1>/. | Bootrom. | NATIVE_FIRM. | - | Yes |
| 0x35 | Movable.sed key. This is the keyslot used for movable.sed encryption + AES-CBC MAC with the import/export commands. | Bootrom. | Bootrom. | - | Yes |
| 0x36 | Unknown. Used by friends module. See EncryptDecryptAes. | Bootrom. | Bootrom. | - | Yes |
| 0x37 | Gamecard savedata actual key. | Bootrom. | NATIVE_FIRM. | - | Yes |
| 0x38 | BOSS key. See EncryptDecryptAes. | Bootrom. | Bootrom. | - | Yes |
| 0x39 | Download Play key, and the actual NFC key for generating retail Amiibo keys. This keyslot is used for two different keys. Both are available via EncryptDecryptAes. NATIVE_FIRM sets this keyY to the same one used for keyslot 0x2E. | Bootrom. | NATIVE_FIRM. | - | Yes |
| 0x3A | DSiWare export key. This keyY is initialized via movable.sed. This is used for calculating the AES-CMACs for SD DSiWare_Exports. | Bootrom. | NATIVE_FIRM. | - | Yes |
| 0x3B | CTR-CARD hardware-crypto seed decryption key. AES-CCM is used, the keyY, nonce and MAC are stored in the Card Info Header. | Bootrom. | NATIVE_FIRM. | - | Yes |
| 0x3D | Common key. Used to decrypt title keys in Ticket. | Bootrom. | NATIVE_FIRM. | - | Yes |
| 0x3F | Used for various internal Boot9 crypto operations, different keydata for each one. Used to decrypt the OTP, the FIRM sections when booting from non-NAND, and when generating the console-unique keys. The keydata for this keyslot is overwritten with other keydata before booting FIRM. This keyslot is not known to be used post-Boot9. | Bootrom. | Bootrom. | Bootrom. | Yes |
Updating keydata[edit]
The contents of the keyslot specified in AES_KEYCNT can be updated by consecutively writing four words to AES_KEYXFIFO (keyX), AES_KEYYFIFO(keyY), or AES_KEYFIFO (normalkey).
After writing to a keyslot, the keyslot must be selected again(write AES_KEYSEL + set AES_CNT bit26), even when writing to the same keyslot. Writing the last word to a key FIFO immediately after selecting a keyslot will not affect the keyslot keydata that gets used at that time, the new keydata will not get used until the keyslot gets selected again.
Writing to the key FIFOs with byte writes results in the AES engine converting the byte to a word for setting the key word, with this: word = (byteval) (byteval<<8) (byteval<<16) (byteval<<24). The result is the same regardless of which FIFO register byte was written to.
The TWL keyslots 0x00-0x03 can be set directly by writing to the AES_KEY0-AES_KEY3 registers.
The key FIFOs can be written simultaneously. For example, executing the following will result in the keyX and keyY being set to all-zero(unknown for normalkey): memset(0x10009100, 0, 0x100);
Each key FIFO has a 0x10-byte tmp-buffer for storing the words written to that FIFO. Once the last word is written to a key FIFO, the filled tmp-buffer is then written to the key-data for the keyslot selected by AES_KEYCNT at the time the last word was written.
Hardware key generator[edit]
A dedicated hardware key generator can be used to generate a keyslot's normal-key from its keyX and keyY. The hardware key generator is triggered by writing the keyY, which is the only way to trigger it with the 3DS keyslots.
The algorithm for generating the normal-key from keyX and keyY is as follows, in big-endian 128-bit unsigned wraparound arithmetic:
| Mode | Formula |
|---|---|
| 3DS | NormalKey = (((KeyX ROL 2) XOR KeyY) + C1) ROR 41 |
| DSi | NormalKey = ((KeyX XOR KeyY) + C2) ROL 42 |
Unless noted otherwise, all keyslots on retail units use the hardware key generator.
FIRM-launch key clearing[edit]
Starting with 9.0.0-20 the Process9 FIRM-launch code now 'clears' the following AES keyslots, with certain keydata by writing the normal-key: 0x15 and 0x18-0x20. These are the keyslots used by the New3DS FIRM arm9bin loader(minus keyslot 0x11), the New3DS Process9 does this too.
AES key-init[edit]
Aes 16 Byte Key Generator Software
See here for how Boot9 initializes the AES keyslots.
For an issue with console-unique key-init, see here.
Some of the Boot9 key-init appears to have a bug(?) when initializing a chunk of keyslots at once: normally it does for(i=0; i<4; i++){.. <setup_keyslot_keydata(keyslotbase+i, keydata)> ..}, however in some cases it does that except with (keyslotbase, instead. This results in the keyslot specified by keyslotbase being initialized 4 times in a row, with the remaining 3 keyslots following keyslotbase being left uninitialized.
initialize_aeskeys() works as follows:
16 Byte Aes Key Generator
- Validates input, calls panic() on failure. conunique_dataptr and bootrom_dataptr are both input parameters for initialize_aeskeys().
- Calls crypto_initialize().
- Then it basically: copies 0x1C-bytes from conunique_dataptr to tmpbuf+0(sp+12), and copies data from bootrom_dataptr with size 0x40-0x1C to tmpbuf+0x1C(conunique_dataptr and bootrom_dataptr are updated afterwards).
- The 0x40-byte tmpbuf is hashed with SHA256.
- Keyslot 0x3F is then initialized using the above hash: keyX = first 0x10-bytes of the hash, keyY = last 0x10-bytes of the hash.
- Then with each console-unique key-init code-block: IV is loaded from bootrom_dataptr(which is updated afterwards), then the 0x40-bytes from bootrom_dataptr is encrypted with AES-CBC. The output is then used as 4 keyXs for initializing keyslots. How bootrom_dataptr is updated if at all varies per code-block. Hashing similar to the code at the start of this function is also run(when the remaining size for conunique_dataptr is non-zero), but the output hash isn't used(this code is also slightly different for one code-block).
- Once finished with that, the non-console-unique keyslots are initialized. This is done with keydata loaded directly from bootrom_dataptr.
- The last initialized keyslot is 0x3F, via normalkey. The keydata for this is copied to 0xFFF00618. This is for restoring the keydata when non-NAND FIRM boot fails, since those use keyslot 0x3F with other keydata.
- Lastly it clears the 0x40-bytes at tmpbuf with the u32 loaded from bootrom_dataptr(the word following the above keyslot 0x3F keydata), then returns.
32 Byte Key Generator
The keyslots are initialized with the same order of keyslots+keydata_type listed below:
Console-unique keydata, after the initialization for the key-generation keyslot(0x3F):
Aes 16 Byte Key Generator Reviews
Common keydata: