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Amend NEP-2 #17

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Nov 2, 2017
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Amend NEP-2 #17

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bc6bddc
Amend Decryption steps
ixje Oct 28, 2017
cb39690
amend Encryption steps
ixje Oct 28, 2017
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8 changes: 4 additions & 4 deletions nep-2.mediawiki
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Expand Up @@ -71,7 +71,7 @@ To keep the size of the encrypted key down, no initialization vectors (IVs) are

#Derive a key from the passphrase using scrypt

#*Parameters: passphrase is the passphrase itself encoded in UTF-8 and normalized using Unicode Normalization Form C (NFC). salt is addresshash from the earlier step, n=16384, r=8, p=8, length=64
#*Parameters: passphrase is the passphrase itself encoded in UTF-8 and normalized using Unicode Normalization Form C (NFC). Salt is the addresshash from the earlier step, n=16384, r=8, p=8, length=64

#*Let's split the resulting 64 bytes in half, and call them derivedhalf1 and derivedhalf2.

Expand All @@ -81,17 +81,17 @@ To keep the size of the encrypted key down, no initialization vectors (IVs) are

The encrypted private key is the Base58Check-encoded concatenation of the following, which totals 39 bytes without Base58 checksum:

*0x01 0x42 + flagbyte + salt + encryptedhalf1 + encryptedhalf2
*0x01 0x42 + flagbyte + addresshash + encryptedhalf1 + encryptedhalf2

===Decryption steps===

#Collect encrypted private key and passphrase from user.

#Derive derivedhalf1 and derivedhalf2 by passing the passphrase and addresshash into scrypt function.

#Decrypt encryptedhalf1 and encryptedhalf2 using AES256Decrypt, merge them to form the encrypted private key.
#Decrypt encryptedhalf1 and encryptedhalf2 using AES256Decrypt, merge the two parts and XOR the result with derivedhalf1 to form the plaintext private key.

#Convert that private key into a NEO address.
#Convert that plaintext private key into a NEO address.

#Hash the NEO address, and verify that addresshash from the encrypted private key record matches the hash. If not, report that the passphrase entry was incorrect.

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