[DEWIF] addv4

rfc/0013_Duniter_Encrypted_Wallet_Import_Format.md

@@ -75,8 +75,7 @@ Example #1:
 
 aes256 key generated from scrypt with the following parameters:  
 
-password: "user password"  
-salt: "user salt"  
+keypair seed: 0xbfa3f6e322cf21d0e652f79a69df9498fdf5347665e5646d9041f756496a1143
 N : 4096  
 r: 16  
 p: 1
@@ -84,7 +83,7 @@ p: 1
 ```txt
 0x000000001 #v1
 0x100000001 #g1-test
-0xbfa3f6e322cf21d0e652f79a69df9498fdf5347665e5646d9041f756496a1143 # seed
+0xbfa3f6e322cf21d0e652f79a69df9498fdf5347665e5646d9041f756496a1143 # keypair seed
 0x17df9d2b059cdd2825955691e3a783e6da403148ddebb1144d1a9b9e545f2371 # public key
 ```
 
@@ -142,17 +141,16 @@ Example #2:
 
 aes256 key generated from scrypt with the following parameters:  
 
-password: "user password"  
-salt: "user salt"  
+keypair seed: 0xbfa3f6e322cf21d0e652f79a69df9498fdf5347665e5646d9041f756496a1143
 N : `2^15 = 32768`
 r: 16  
 p: 1
 
 ```txt
-0x000000001 #v1
+0x000000003 #v3
 0x100000001 #g1-test
 0x0F # log N
-0xbfa3f6e322cf21d0e652f79a69df9498fdf5347665e5646d9041f756496a1143 # seed
+0xbfa3f6e322cf21d0e652f79a69df9498fdf5347665e5646d9041f756496a1143 # keypair seed
 0x17df9d2b059cdd2825955691e3a783e6da403148ddebb1144d1a9b9e545f2371 # public key
 ```
 
@@ -160,4 +158,52 @@ DEWIF base 64 string (with aes key `"toto titi tata"`):
 
 `AAAAAxAAAAEPdMuBFXF4C6GZPGsJDiPBbacpVKeaLoJwkDsuqLjkwof1c760Z5iVpnZlLt5XEFlEehbdtLllVhccf9OK6Zjn8A==`
 
+### v4
+
+Version 4 stores an HD wallet according to the [BIP32-Ed25519] specifications.
+
+v4 data :
+
+| `log N` | Encrypted data |
+|:-------:|:--------------:|
+| 1 byte  | 64 bytes       |
+
+Encrypted data :
+
+| seed(32 bytes) | public key(32bytes) |
+|:--------------:|:-------------------:|
+| seed bytes     | public key bytes    |
+
+The public key serves as a checksum. To check that the DEWIF base64 string is not corrupted, generate a [BIP32-Ed25519] keypair with the seed and check that the obtained public key matches.
+
+Symmetric encryption algorithm : aes256
+
+aes256 key: scrypt of user passphrase with the following parameters:  
+
+password: passphrase  
+salt: sha256("dewif" ++ passphrase)  
+N : `2^(log N)`
+r: 16  
+p: 1
+
+Example #3:
+
+keypair seed: 0xb7d3a54e1c20172cd38e0d803776a3bacf11f895ef8ef846043a0d628431c872
+N : `2^15 = 32768`
+r: 16  
+p: 1
+
+```txt
+0x000000004 #v4
+0x100000001 #g1-test
+0x0F # log N
+0xb7d3a54e1c20172cd38e0d803776a3bacf11f895ef8ef846043a0d628431c872 # keypair seed
+0xd1fec6ddf6e887e40bd77d459131ee5a6bec1194341b9393ead606363bb7b060 # public key
+```
+
+DEWIF base 64 string (with aes key `"toto titi tata"`):
+
+`AAAABBAAAAEPcE3yXhA0T0iElXR/vDbZTRSmdec26lWu42mWKuaczzxZ22bIGVfLmlhfVW9NWmWY7m/P/j0W6Su4QZEiERe8vA==`
+
+[BIP32-Ed25519]: https://drive.google.com/file/d/0ByMtMw2hul0EMFJuNnZORDR2NDA/view
 [DUBP]: https://git.duniter.org/nodes/common/doc/blob/master/rfc/0010_Duniter_Blockchain_Protocol_V12.md