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security fixes, added payment_base to contract

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Omar Shibli 2017-10-31 05:24:28 +02:00
parent dd1f4e0e26
commit b63ed0e17e
1 changed files with 22 additions and 18 deletions
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@ -74,7 +74,7 @@ Hardened derivation is used at this level.
===Payment address generation=== ===Payment address generation===
For a given contract documents denoted by c<sub>1</sub> ,...,c<sub>n</sub>, payment base extended public key denoted by <code>payment_base</code>, and cryptographic hash function denoted by <code>h</code>. For a given contract documents denoted by c<sub>1</sub>,...,c<sub>n</sub>, payment base extended public key denoted by <code>payment_base</code>, and cryptographic hash function denoted by <code>h</code>.
1. Compute cryptographic hashes for all contract documents, by applying the hash function. 1. Compute cryptographic hashes for all contract documents, by applying the hash function.
@ -84,9 +84,9 @@ For a given contract documents denoted by c<sub>1</sub> ,...,c<sub>n</sub>, paym
hash_1,...,hash_n hash_1,...,hash_n
3. Concatenate the sorted hashes and apply the hash function. 3. Prepend payment_base and concatenate the sorted hashes and apply the hash function.
h(hash_1+...+hash_n) h(payment_base+hash_1+...+hash_n)
4. Compute a partial BIP32 derivation path from the combined hash as defined in Hash to Partial Derivation Path Mapping procedure below. 4. Compute a partial BIP32 derivation path from the combined hash as defined in Hash to Partial Derivation Path Mapping procedure below.
@ -171,28 +171,28 @@ document 2:
3. Concatenate hashes and apply the hash function. 3. Concatenate hashes and apply the hash function.
concatenated hash: concatenated hash: payment_base
2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7aefcde2b2edba56bf408601fb721fe9b5c338d10ee429ea04fae5511b68fbf8fb9 xpub6B3JSEWjqm5GgfzcjPwBixxLPzi15pFM3jq4E4yCzXXUFS5MFdXiSdw7b5dbdPGHuc7c1V4zXbbFRtc9G1njMUt9ZvMdGVGYQSQsurD6HAW2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7aefcde2b2edba56bf408601fb721fe9b5c338d10ee429ea04fae5511b68fbf8fb9
combined hash: combined hash:
ec321de56af3b66fb49e89cfe346562388af387db689165d6f662a3950286a57 310057788c6073640dc222466d003411cd5c1cc0bf2803fc6ebbfae03ceb4451
4. Compute the partial BIP32 derivation path of the combined hash. 4. Compute the partial BIP32 derivation path of the combined hash.
60466/7653/27379/46703/46238/35279/58182/22051/34991/14461/46729/5725/28518/10809/20520/27223 12544/22392/35936/29540/3522/8774/27904/13329/52572/7360/48936/1020/28347/64224/15595/17489
5. Prepend <code>payment_base</code> to <code>contract_hash</code> derivation path. 5. Prepend <code>payment_base</code> to <code>contract_hash</code> derivation path.
contract_base_pub/60466/7653/27379/46703/46238/35279/58182/22051/34991/14461/46729/5725/28518/10809/20520/27223 contract_base_pub/12544/22392/35936/29540/3522/8774/27904/13329/52572/7360/48936/1020/28347/64224/15595/17489
or or
m/175'/0'/60466/7653/27379/46703/46238/35279/58182/22051/34991/14461/46729/5725/28518/10809/20520/27223 m/175'/0'/12544/22392/35936/29540/3522/8774/27904/13329/52572/7360/48936/1020/28347/64224/15595/17489
6. Compute public extended key. 6. Compute public extended key.
xpub6hML7vSU2Hwww9ctwrwt4ijnhJr4n6XaMRox1nnF3PvZKuF1SZoTymnKQHrF9fp2nWJSqv5ZjJSxJJQ8A3PKcBUWhGvTFmuRKpycSCr5coz xpub6hefaATTG5LbcwyPDvmNfnkyzefoM2TJDoo5astH7Gvs1g8vZURviBWvAvBnWc2CNb8ybJ6mDpnQYVsvNSZ3oUmbssX3rUVG97TFYa6AXVk
7. Compute address of the public extended key (P2PKH). 7. Compute address of the public extended key (P2PKH).
1HYjhPTtMmpBJBd5tVepZDAVdvPA7o8KHJ 1C7f322izqMqLzZzfzkPAjxBzprxDi47Yf
====Verification example (negative test)==== ====Verification example (negative test)====
@ -207,29 +207,33 @@ document 1:
baa5a0964d3320fbc0c6a922140453c8513ea24ab8fd0577034804a967248096 baa5a0964d3320fbc0c6a922140453c8513ea24ab8fd0577034804a967248096
2. Apply the hash function a second time (list of one item). 2. Prepend payment_base
xpub6B3JSEWjqm5GgfzcjPwBixxLPzi15pFM3jq4E4yCzXXUFS5MFdXiSdw7b5dbdPGHuc7c1V4zXbbFRtc9G1njMUt9ZvMdGVGYQSQsurD6HAWbaa5a0964d3320fbc0c6a922140453c8513ea24ab8fd0577034804a967248096
2. Apply hash function
3a08605829413ce0bf551b08d21e4a28dbda6e407f90eff1c448e839050c73a1 3a08605829413ce0bf551b08d21e4a28dbda6e407f90eff1c448e839050c73a1
3. Compute the partial derivation path. 3. Compute the partial derivation path.
14856/24664/10561/15584/48981/6920/53790/18984/56282/28224/32656/61425/50248/59449/1292/29601 5338/54412/19213/962/30664/62597/11873/59874/56779/24089/54550/19585/28087/36422/18666/17562
4. Prepend contract_base<sub>pub</sub> to contract_hash derivation path. 4. Prepend contract_base<sub>pub</sub> to contract_hash derivation path.
contract_base_pub/14856/24664/10561/15584/48981/6920/53790/18984/56282/28224/32656/61425/50248/59449/1292/29601 contract_base_pub/5338/54412/19213/962/30664/62597/11873/59874/56779/24089/54550/19585/28087/36422/18666/17562
or or
m/175'/0'/14856/24664/10561/15584/48981/6920/53790/18984/56282/28224/32656/61425/50248/59449/1292/29601 m/175'/0'/5338/54412/19213/962/30664/62597/11873/59874/56779/24089/54550/19585/28087/36422/18666/17562
5. Compute public extended key. 5. Compute public extended key.
xpub6gujKWRhegHXKZBkrprW55oSL6UxYhStxF5FtoUNa4KShLxLPDLQTS39XAwRhdCSvuAv2wogwukmfk3fS7CM6pT6QWwJHiCTw7RkwXMgThy xpub6h9k2KqsMpwghxt7naj1puhGV1ZDC88sxvpYN1HibCf8yQZdPsuhYmmvdK32Kf2Lb3rS1sV8UcZ1f84DJEiXuVfLCAj4bC85aEUCxh38m8i
7. Compute address of the public extended key (P2PKH). 7. Compute address of the public extended key (P2PKH).
162KDdRXa3KPgYkH3d1DDKfddacH1gn1n8 1QGe5LaDMAmHeibJbZBmZqhQDZSp7QCqSs
8. As expected the address doesn't match the Bitcoin address from the last example <code>1LeYXs63uVSDu2XSb82xdEc7RumohCpB7Q</code>. 8. As expected the address doesn't match the Bitcoin address from the last example <code>1C7f322izqMqLzZzfzkPAjxBzprxDi47Yf</code>.
Verification operation will succeed only if we use identical documents to ones that have been used in the contract address generation. Verification operation will succeed only if we use identical documents to ones that have been used in the contract address generation.