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* Add Cuckarooz * Equivalent of mimblewimble/grin#3343
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| Original file line number | Diff line number | Diff line change |
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| // Copyright 2020 BlockCypher | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
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| package pow | ||
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||
| import ( | ||
| "errors" | ||
|
|
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| "github.com/blockcypher/libgrin/core/consensus" | ||
| ) | ||
|
|
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| // NewCuckaroozCtx instantiates a new CuckaroozContext as a PowContext. Note that this can't | ||
| /// be moved in the PoWContext trait as this particular trait needs to be | ||
| /// convertible to an object trait. | ||
| func NewCuckaroozCtx(chainType consensus.ChainType, edgeBits uint8, proofSize int) *CuckaroomContext { | ||
| cp := new(CuckooParams) | ||
| params := cp.new(edgeBits, proofSize) | ||
| return &CuckaroomContext{chainType, params} | ||
| } | ||
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| // CuckaroozContext is a Cuckarooz cycle context. Only includes the verifier for now. | ||
| type CuckaroozContext struct { | ||
| chainType consensus.ChainType | ||
| params CuckooParams | ||
| } | ||
|
|
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| // SetHeaderNonce sets the header nonce. | ||
| func (c *CuckaroozContext) SetHeaderNonce(header []uint8, nonce *uint32) { | ||
| c.params.resetHeaderNonce(header, nonce) | ||
| } | ||
|
|
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| // Verify verifies the Cuckaroom context. | ||
| func (c *CuckaroozContext) Verify(proof Proof) error { | ||
| if proof.proofSize() != consensus.ChainTypeProofSize(c.chainType) { | ||
| return errors.New("wrong cycle length") | ||
| } | ||
| nonces := proof.Nonces | ||
| uvs := make([]uint64, 2*proof.proofSize()) | ||
| var xoruv uint64 = 0 | ||
| nodeMask := c.params.edgeMask<<1 | 1 | ||
|
|
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| for n := 0; n < proof.proofSize(); n++ { | ||
| if nonces[n] > c.params.edgeMask { | ||
| return errors.New("edge too big") | ||
| } | ||
| if n > 0 && nonces[n] <= nonces[n-1] { | ||
| return errors.New("edges not ascending") | ||
| } | ||
| // 21 is standard siphash rotation constant | ||
| edge := SipHashBlock(c.params.siphashKeys, nonces[n], 21, true) | ||
| uvs[2*n] = edge & nodeMask | ||
| uvs[2*n+1] = edge >> 32 & nodeMask | ||
| xoruv ^= uvs[2*n] ^ uvs[2*n+1] | ||
| } | ||
| if xoruv != 0 { | ||
| return errors.New("endpoints don't match up") | ||
| } | ||
|
|
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| n := 0 | ||
| i := 0 | ||
| j := 0 | ||
| for { | ||
| // follow cycle | ||
| j = i | ||
| k := j | ||
| for { | ||
| k = (j + 1) % (2 * c.params.proofSize) | ||
| if k == i { | ||
| break | ||
| } | ||
| } | ||
| if uvs[k] == uvs[i] { | ||
| // find other edge endpoint matching one at i | ||
| if j != i { | ||
| return errors.New("branch in cycle") | ||
| } | ||
| j = k | ||
| } | ||
| if j == i { | ||
| return errors.New("cycle dead ends") | ||
| } | ||
| i = j ^ 1 | ||
| n++ | ||
| if i == 0 { | ||
| break | ||
| } | ||
| } | ||
| if n == c.params.proofSize { | ||
| return nil | ||
| } | ||
| return errors.New("cycle too short") | ||
|
|
||
| } |
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