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[authen-passphrase-scrypt.git] / scrypt-1.2.1 / FORMAT
1 scrypt encrypted data format
2 ----------------------------
3
4 offset length
5 0 6 "scrypt"
6 6 1 scrypt data file version number (== 0)
7 7 1 log2(N) (must be between 1 and 63 inclusive)
8 8 4 r (big-endian integer; must satisfy r * p < 2^30)
9 12 4 p (big-endian integer; must satisfy r * p < 2^30)
10 16 32 salt
11 48 16 first 16 bytes of SHA256(bytes 0 .. 47)
12 64 32 HMAC-SHA256(bytes 0 .. 63)
13 96 X data xor AES256-CTR key stream generated with nonce == 0
14 96+X 32 HMAC-SHA256(bytes 0 .. 96 + (X - 1))
15
16 AES256-CTR is computed with a 256-bit AES key key_enc, and HMAC-SHA256 is
17 computed with a 256-bit key key_hmac, where
18 scrypt(password, salt, N, r, p, 64) == [key_enc][key_hmac]
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