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| 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 96 .. 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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