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[lsd0009] branch master updated: protocol: add payment and deposit
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[lsd0009] branch master updated: protocol: add payment and deposit |
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Date: |
Fri, 13 Jun 2025 15:53:15 +0200 |
This is an automated email from the git hooks/post-receive script.
mikolai-guetschow pushed a commit to branch master
in repository lsd0009.
The following commit(s) were added to refs/heads/master by this push:
new 8797396 protocol: add payment and deposit
8797396 is described below
commit 879739666fd6f37b2f193716d62c06c0447cae71
Author: Mikolai Gütschow <mikolai.guetschow@tu-dresden.de>
AuthorDate: Fri Jun 13 15:53:10 2025 +0200
protocol: add payment and deposit
---
draft-guetschow-taler-protocol.md | 146 +++++++++++++--
draft-guetschow-taler-protocol.xml | 360 ++++++++++++++++++++++++++-----------
2 files changed, 383 insertions(+), 123 deletions(-)
diff --git a/draft-guetschow-taler-protocol.md
b/draft-guetschow-taler-protocol.md
index 7e63ff1..7dd5aa7 100644
--- a/draft-guetschow-taler-protocol.md
+++ b/draft-guetschow-taler-protocol.md
@@ -371,36 +371,38 @@ persist (reserve, value) |
master_secret = random(256) |
persist master_secret |
*(coin, blind_secret) = GenerateCoin(master_secret, ?*) |
+*coin.h_denom = SHA-512(bigEndian(32, 0) | bigEndian(32, 1) | denom.pub)
*blind_coin = RSA-FDH-Blind(SHA-512(coin.pub), blind_secret, denom.pub)
-sig = EdDSA-Sign(reserve.priv, msg) |
+sig0 = EdDSA-Sign(reserve.priv, msg0) |
| |
|-------------- /withdraw -------------->|
- | (reserve.pub, *SHA-512(denom.pub), |
- | *blind_coin, sig) |
+ | (reserve.pub, *coin.h_denom, |
+ | *blind_coin, sig) |
| |
+ | *denom = Denom-Lookup(coin.h_denom)
| check *denom.pub known and not
withdrawal-expired
| check EdDSA-Verify(reserve.pub, msg,
sig)
| check reserve KYC status ok or not
needed
- | check reserve.balance >=
sum(*denom.valueAndFee)
- | reserve.balance -=
sum(*denom.valueAndFee)
- | *blind_sig = RSA-FDH-Sign(b,
denom.priv)
+ | check reserve.balance >=
sum(*denom.value + *denom.fee_withdraw)
+ | reserve.balance -= sum(*denom.value +
*denom.fee_withdraw)
+ | *blind_sig = RSA-FDH-Sign(blind_coin,
denom.priv)
| persist withdrawal
| |
|<------------ *blind_sig ---------------|
| |
-*coin_sig = RSA-FDH-Unblind(blind_sig, blind_secret, denom.pub)
-check *RSA-FDH-Verify(SHA-512(coin.pub), coin_sig, denom.pub)
-persist *(coin, blind_secret, coin_sig)
+*coin.sig = RSA-FDH-Unblind(blind_sig, blind_secret, denom.pub)
+check *RSA-FDH-Verify(SHA-512(coin.pub), coin.sig, denom.pub)
+persist *(coin, blind_secret)
~~~
-where `msg` is formed as follows:
+where `msg0` is formed as follows:
~~~
-msg = bigEndian(32, 160) | bigEndian(32, 1200) /*
TALER_SIGNATURE_WALLET_RESERVE_WITHDRAW */
- | bigEndianAmount(sum(*denom.value)) |
bigEndianAmount(sum(*denom.fee_withdrawal))
- | SHA-512( *(SHA-512(denom.pub) | bigEndian(32, 0x1) | blind_coin) )
- | bigEndian(256, 0x0)
- | bigEndian(32, 0x0) | bigEndian(32, 0x0)
+msg0 = bigEndian(32, 160) | bigEndian(32, 1200) /*
TALER_SIGNATURE_WALLET_RESERVE_WITHDRAW */
+ | bigEndianAmount(sum(*denom.value)) |
bigEndianAmount(sum(*denom.fee_withdraw))
+ | SHA-512( *(SHA-512(denom.pub) | bigEndian(32, 0x1) | blind_coin) )
+ | bigEndian(256, 0x0)
+ | bigEndian(32, 0x0) | bigEndian(32, 0x0)
~~~
The wallet derives coins and blinding secrets using `GenerateCoin` from a
master secret and an integer index.
@@ -431,6 +433,120 @@ coin.pub = EdDSA-GetPub(coin.priv)
(for RSA, without age-restriction)
+## Payment
+
+~~~
+ wallet merchant
+knows merchant.pub knows merchant.priv
+knows valid *coin knows exchange, payto
+ | |
+ | wire_salt = random(128)
+ | persist order = (id, price, info,
token?, wire_salt)
+ | |
+ |<-------- (order.{id,token?}) ----------|
+ | |
+nonce = EdDSA-Keygen() |
+persist nonce.priv |
+ | |
+ |------- /orders/{order.id}/claim ------>|
+ | (nonce, token?) |
+ | |
+ | h_wire = HKDF(wire_salt, payto,
+ |
"merchant-wire-signature", 64)
+ | determine timestamp, refund_deadline,
wire_deadline
+ | contract =
(order.{id,price,info,token?},
+ | exchange, h_wire,
timestamp,
+ | refund_deadline,
wire_deadline)
+ | check contract.token = token?
+ | contract.nonce = nonce
+ | persist contract
+ | sig0 = EdDSA-Sign(merchant.priv, msg0)
+ | |
+ |<----------- contract, sig0 ------------|
+ | |
+check EdDSA-Verify(merchant.pub, msg0, sig0) |
+check contract.nonce = nonce |
+TODO: double-check extra hash check? |
+*(coin, fraction) = CoinSelection(contract.{exchange,price}) TODO: include
MarkDirty here
+*sig1 = EdDSA-Sign(*coin.priv, *msg1) |
+*deposit = *(coin.{pub,sig,h_denom}, fraction, sig1) |
+persist (contract, sig, *deposit) |
+ | |
+ |------- /orders/{order.id}/pay -------->|
+ | (*deposit) |
+ | |
+ | check sum(*deposit.fraction) =
contract.price
+ | *check Deposit(deposit)
+ | sig2 = EdDSA-Sign(merchant.priv, msg2)
+ | |
+ |<---------------- sig2 -----------------|
+ | |
+check EdDSA-Verify(merchant.pub, msg2, sig2) |
+~~~
+
+TODO: discuss - nonce doesn't strictly need to be EdDSA keypair?
+
+where `msg0`, `*msg1`, and `msg2` are formed as follows:
+
+~~~
+h_contract = SHA-512(canonicalJSON(contract))
+
+msg0 = bigEndian(32, 72) | bigEndian(32, 1101) /*
TALER_SIGNATURE_MERCHANT_CONTRACT */
+ | h_contract
+*msg1 = bigEndian(32, 456) | bigEndian(32, 1201) /*
TALER_SIGNATURE_WALLET_COIN_DEPOSIT */
+ | h_contract | bigEndian(256, 0x0)
+ | bigEndian(512, 0x0) | contract.h_wire | *coin.h_denom
+ | bigEndianTime(contract.timestamp) |
bigEndianTime(contract.refund_deadline)
+ | bigEndianAmount(*fraction + *denom.fee_deposit)
+ | bigEndianAmount(*denom.fee_deposit) | merchant.pub | bigEndian(512,
0x0)
+msg2 = bigEndian(32, 72) | bigEndian(32, 1104) /*
TALER_SIGNATURE_MERCHANT_PAYMENT_OK */
+ | h_contract
+~~~
+
+(without age restriction, policy and wallet data hash)
+
+## Deposit
+
+~~~
+ merchant/wallet exchange
+knows exchange.pub knows exchange.priv
+knows merchant.pub knows *denom.pub
+knows payto, wire_salt, sig2, h_contract
+knows contract, *deposit from Payment
+ | |
+ |----------- /batch-deposit ------------>|
+ | (contract.{timestamp,wire_deadline,refund_deadline}
+ | h_contract, merchant.pub, sig2, |
+ | payto, *deposit, wire_salt) |
+ | |
+ | *denom =
Denom-Lookup(*deposit.coin.h_denom)
+ | check *denom.pub known and not
deposit-expired
+ | contract.h_wire = HKDF(wire_salt,
payto,
+ |
"merchant-wire-signature", 64)
+ | check *EdDSA-Verify(deposit.coin.pub,
msg1, sig1)
+ | check
*RSA-FDH-Verify(SHA-512(deposit.coin.pub),
+ |
deposit.coin.sig, denom.pub)
+ | check not overspending
+ | persist deposit-record, mark-spent
+ | schedule bank transfer
+ | exchange_timestamp = now()
+ | sig3 = EdDSA-Sign(exchange.priv, msg3)
+ | |
+ |<----- sig3, exchange_timestamp --------|
+ | |
+check EdDSA-Verify(exchange.pub, msg3, sig3) |
+~~~
+
+where `msg3` is formed as follows:
+
+~~~
+msg3 = bigEndian(32, 344) | bigEndian(32, 1033) /*
TALER_SIGNATURE_EXCHANGE_CONFIRM_DEPOSIT */
+ | h_contract | contract.h_wire | bigEndian(512, 0x0)
+ | bigEndianTime(exchange_timestamp) |
bigEndianTime(contract.wire_deadline)
+ | bigEndianTime(contract.refund_deadline)
+ | bigEndianAmount(sum(*deposit.fraction - *denom.fee_deposit))
+ | SHA-512(*deposit.sig1) | merchant.pub
+~~~
# Security Considerations
diff --git a/draft-guetschow-taler-protocol.xml
b/draft-guetschow-taler-protocol.xml
index 834f6c7..ab4b974 100644
--- a/draft-guetschow-taler-protocol.xml
+++ b/draft-guetschow-taler-protocol.xml
@@ -29,7 +29,7 @@
</address>
</author>
- <date year="2025" month="May" day="26"/>
+ <date year="2025" month="June" day="13"/>
<workgroup>independent</workgroup>
@@ -402,36 +402,38 @@ persist (reserve, value) |
master_secret = random(256) |
persist master_secret |
*(coin, blind_secret) = GenerateCoin(master_secret, ?*) |
+*coin.h_denom = SHA-512(bigEndian(32, 0) | bigEndian(32, 1) | denom.pub)
*blind_coin = RSA-FDH-Blind(SHA-512(coin.pub), blind_secret, denom.pub)
-sig = EdDSA-Sign(reserve.priv, msg) |
+sig0 = EdDSA-Sign(reserve.priv, msg0) |
| |
|-------------- /withdraw -------------->|
- | (reserve.pub, *SHA-512(denom.pub), |
- | *blind_coin, sig) |
+ | (reserve.pub, *coin.h_denom, |
+ | *blind_coin, sig) |
| |
+ | *denom = Denom-Lookup(coin.h_denom)
| check *denom.pub known and not
withdrawal-expired
| check EdDSA-Verify(reserve.pub, msg,
sig)
| check reserve KYC status ok or not
needed
- | check reserve.balance >=
sum(*denom.valueAndFee)
- | reserve.balance -=
sum(*denom.valueAndFee)
- | *blind_sig = RSA-FDH-Sign(b,
denom.priv)
+ | check reserve.balance >=
sum(*denom.value + *denom.fee_withdraw)
+ | reserve.balance -= sum(*denom.value +
*denom.fee_withdraw)
+ | *blind_sig = RSA-FDH-Sign(blind_coin,
denom.priv)
| persist withdrawal
| |
|<------------ *blind_sig ---------------|
| |
-*coin_sig = RSA-FDH-Unblind(blind_sig, blind_secret, denom.pub)
-check *RSA-FDH-Verify(SHA-512(coin.pub), coin_sig, denom.pub)
-persist *(coin, blind_secret, coin_sig)
+*coin.sig = RSA-FDH-Unblind(blind_sig, blind_secret, denom.pub)
+check *RSA-FDH-Verify(SHA-512(coin.pub), coin.sig, denom.pub)
+persist *(coin, blind_secret)
]]></artwork></figure>
-<t>where <spanx style="verb">msg</spanx> is formed as follows:</t>
+<t>where <spanx style="verb">msg0</spanx> is formed as follows:</t>
<figure><artwork><![CDATA[
-msg = bigEndian(32, 160) | bigEndian(32, 1200) /*
TALER_SIGNATURE_WALLET_RESERVE_WITHDRAW */
- | bigEndianAmount(sum(*denom.value)) |
bigEndianAmount(sum(*denom.fee_withdrawal))
- | SHA-512( *(SHA-512(denom.pub) | bigEndian(32, 0x1) | blind_coin) )
- | bigEndian(256, 0x0)
- | bigEndian(32, 0x0) | bigEndian(32, 0x0)
+msg0 = bigEndian(32, 160) | bigEndian(32, 1200) /*
TALER_SIGNATURE_WALLET_RESERVE_WITHDRAW */
+ | bigEndianAmount(sum(*denom.value)) |
bigEndianAmount(sum(*denom.fee_withdraw))
+ | SHA-512( *(SHA-512(denom.pub) | bigEndian(32, 0x1) | blind_coin) )
+ | bigEndian(256, 0x0)
+ | bigEndian(32, 0x0) | bigEndian(32, 0x0)
]]></artwork></figure>
<t>The wallet derives coins and blinding secrets using <spanx
style="verb">GenerateCoin</spanx> from a master secret and an integer index.
@@ -462,6 +464,123 @@ coin.pub = EdDSA-GetPub(coin.priv)
<t>(for RSA, without age-restriction)</t>
+</section>
+<section anchor="payment"><name>Payment</name>
+
+<figure><artwork><![CDATA[
+ wallet merchant
+knows merchant.pub knows merchant.priv
+knows valid *coin knows exchange, payto
+ | |
+ | wire_salt = random(128)
+ | persist order = (id, price, info,
token?, wire_salt)
+ | |
+ |<-------- (order.{id,token?}) ----------|
+ | |
+nonce = EdDSA-Keygen() |
+persist nonce.priv |
+ | |
+ |------- /orders/{order.id}/claim ------>|
+ | (nonce, token?) |
+ | |
+ | h_wire = HKDF(wire_salt, payto,
+ |
"merchant-wire-signature", 64)
+ | determine timestamp, refund_deadline,
wire_deadline
+ | contract =
(order.{id,price,info,token?},
+ | exchange, h_wire,
timestamp,
+ | refund_deadline,
wire_deadline)
+ | check contract.token = token?
+ | contract.nonce = nonce
+ | persist contract
+ | sig0 = EdDSA-Sign(merchant.priv, msg0)
+ | |
+ |<----------- contract, sig0 ------------|
+ | |
+check EdDSA-Verify(merchant.pub, msg0, sig0) |
+check contract.nonce = nonce |
+TODO: double-check extra hash check? |
+*(coin, fraction) = CoinSelection(contract.{exchange,price}) TODO: include
MarkDirty here
+*sig1 = EdDSA-Sign(*coin.priv, *msg1) |
+*deposit = *(coin.{pub,sig,h_denom}, fraction, sig1) |
+persist (contract, sig, *deposit) |
+ | |
+ |------- /orders/{order.id}/pay -------->|
+ | (*deposit) |
+ | |
+ | check sum(*deposit.fraction) =
contract.price
+ | *check Deposit(deposit)
+ | sig2 = EdDSA-Sign(merchant.priv, msg2)
+ | |
+ |<---------------- sig2 -----------------|
+ | |
+check EdDSA-Verify(merchant.pub, msg2, sig2) |
+]]></artwork></figure>
+
+<t>TODO: discuss - nonce doesn't strictly need to be EdDSA keypair?</t>
+
+<t>where <spanx style="verb">msg0</spanx>, <spanx style="verb">*msg1</spanx>,
and <spanx style="verb">msg2</spanx> are formed as follows:</t>
+
+<figure><artwork><![CDATA[
+h_contract = SHA-512(canonicalJSON(contract))
+
+msg0 = bigEndian(32, 72) | bigEndian(32, 1101) /*
TALER_SIGNATURE_MERCHANT_CONTRACT */
+ | h_contract
+*msg1 = bigEndian(32, 456) | bigEndian(32, 1201) /*
TALER_SIGNATURE_WALLET_COIN_DEPOSIT */
+ | h_contract | bigEndian(256, 0x0)
+ | bigEndian(512, 0x0) | contract.h_wire | *coin.h_denom
+ | bigEndianTime(contract.timestamp) |
bigEndianTime(contract.refund_deadline)
+ | bigEndianAmount(*fraction + *denom.fee_deposit)
+ | bigEndianAmount(*denom.fee_deposit) | merchant.pub | bigEndian(512,
0x0)
+msg2 = bigEndian(32, 72) | bigEndian(32, 1104) /*
TALER_SIGNATURE_MERCHANT_PAYMENT_OK */
+ | h_contract
+]]></artwork></figure>
+
+<t>(without age restriction, policy and wallet data hash)</t>
+
+</section>
+<section anchor="deposit"><name>Deposit</name>
+
+<figure><artwork><![CDATA[
+ merchant/wallet exchange
+knows exchange.pub knows exchange.priv
+knows merchant.pub knows *denom.pub
+knows payto, wire_salt, sig2, h_contract
+knows contract, *deposit from Payment
+ | |
+ |----------- /batch-deposit ------------>|
+ | (contract.{timestamp,wire_deadline,refund_deadline}
+ | h_contract, merchant.pub, sig2, |
+ | payto, *deposit, wire_salt) |
+ | |
+ | *denom =
Denom-Lookup(*deposit.coin.h_denom)
+ | check *denom.pub known and not
deposit-expired
+ | contract.h_wire = HKDF(wire_salt,
payto,
+ |
"merchant-wire-signature", 64)
+ | check *EdDSA-Verify(deposit.coin.pub,
msg1, sig1)
+ | check
*RSA-FDH-Verify(SHA-512(deposit.coin.pub),
+ |
deposit.coin.sig, denom.pub)
+ | check not overspending
+ | persist deposit-record, mark-spent
+ | schedule bank transfer
+ | exchange_timestamp = now()
+ | sig3 = EdDSA-Sign(exchange.priv, msg3)
+ | |
+ |<----- sig3, exchange_timestamp --------|
+ | |
+check EdDSA-Verify(exchange.pub, msg3, sig3) |
+]]></artwork></figure>
+
+<t>where <spanx style="verb">msg3</spanx> is formed as follows:</t>
+
+<figure><artwork><![CDATA[
+msg3 = bigEndian(32, 344) | bigEndian(32, 1033) /*
TALER_SIGNATURE_EXCHANGE_CONFIRM_DEPOSIT */
+ | h_contract | contract.h_wire | bigEndian(512, 0x0)
+ | bigEndianTime(exchange_timestamp) |
bigEndianTime(contract.wire_deadline)
+ | bigEndianTime(contract.refund_deadline)
+ | bigEndianAmount(sum(*deposit.fraction - *denom.fee_deposit))
+ | SHA-512(*deposit.sig1) | merchant.pub
+]]></artwork></figure>
+
</section>
</section>
<section anchor="security-considerations"><name>Security Considerations</name>
@@ -570,7 +689,7 @@ coin.pub = EdDSA-GetPub(coin.priv)
-<?line 443?>
+<?line 559?>
<section anchor="change-log"><name>Change log</name>
@@ -588,97 +707,122 @@ Education and Research (BMBF) within the project
Concrete Contracts.</t>
</back>
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