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41 Commits

Author SHA1 Message Date
Daira Hopwood 813a8891d1 Rename EncodeFVKParts to EncodeXFVKParts, since its input includes dk which is only part of an extended full viewing key. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 14:48:33 +01:00
Daira Hopwood 511c2eb1e0 Fix a link. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood eb60b41f20 Seeds for Sprout master keys must also be at least 32 bytes. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood 5cdc69196a Factor out Sprout a_sk encoding/decoding into helper functions. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood 3018efc0f3 Correct the encoding of a_sk,par for Sprout child derivation. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood 777d82a26f Factor out the encoding of extended {spending key, full viewing key} parts and make it more precise. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood 6f966489b8 Correct the derivation of a Sapling child full viewing key's nk, and define the bases G and H. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood 1b04d74cde Remove unintended addition of a reference to the non-existant (yet) ZIP 173. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood 6e9a79604c Cosmetics. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood 42506f08bd Define DiversifyHash. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood ebecd8c1ff Clarify the encoding of a_sk in a Sprout extended spending key. Also exclude lead bytes, and swap ASK and c for consistency with Sapling formats and BIP 32. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood 5881d3c211 Define depth, parent tag, and i for master keys. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood 7002be59fa Clarify the interpretation of I_L in Sprout key derivation. 
This also fixes a cut-and-paste error (a child chain code is c_i, not c_m).

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood ba56f26b4d Explain that some diversifiers are invalid, and correct the definition of default diversifier. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood 5788c120e7 Rename s_m to sk_m. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood 633436cff6 Specify that the seed MUST be at least 32 bytes. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood d65629f7a1 Clarify the relation to existing use of BIPs 32 & 44. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood 0034331888 Add MUST NOT to Terminology. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood 918ea38834 Fix a cut-and-paste error. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood b9e6ed7e1a Another formatting improvement. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood 3e884f9579 Fix formatting. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood 52eac8c2c1 Put human-readable parts in monospace. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood 0fc7c704a7 Add specifications of key fingerprints, tags, and encodings. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood 6f85acb9b1 Specify the range of j when generating diversifiers. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood b3c051eb4f Say that ZIP 32 does not supplant the use of BIPs 32 & 44 for transparent addresses. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood 8a49de84f6 Cosmetics. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood de065cf344 Update another reference to the Sapling spec version. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood ff5affbc77 Cosmetics. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood f94b9a4c67 Define r_J. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood 1b3ea422fe Reference version 2018.0-beta-21 or later of the Sapling protocol spec. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Daira Hopwood 3f2815838e Cosmetic improvements. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
Jack Grigg da683d31b9 Remove hardening from example public-key HD path 
Hardened derivation is undefined for an extended FVK
 2018-07-25 00:32:43 +01:00
Daira Hopwood 9596aedaa0 ZIP 32: use FF1-AES256 as the PRP. 
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
 2018-07-25 00:32:43 +01:00
str4d a01dbbbcbc Note that ZIP 32 is consistently little-endian 2018-07-25 00:32:43 +01:00
str4d f07b6d2613 Define how to derive diversifiers from Sapling extended keys 2018-07-25 00:32:43 +01:00
str4d efd68a4474 Define I2LEOSP_l(k) and use it to encode the child key indices 
Note that this means they are encoded in little-endian order, which is the
opposite of BIP 32.
 2018-07-25 00:32:43 +01:00
str4d aa36706f38 Fix usage of LEOS2IP in definition of ToScalar 2018-07-25 00:32:43 +01:00
str4d c73733ae13 Define a diversifier key dk 2018-07-25 00:32:43 +01:00
str4d 4ed0316834 Use byte sequences for constant single-byte inputs to PRF_expand 2018-07-25 00:32:43 +01:00
str4d a5309ed60e Address Daira's comments 2018-07-25 00:32:43 +01:00
str4d 9a87098e0c ZIP 32: Shielded Hierarchical Deterministic Wallets 2018-07-25 00:32:43 +01:00