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License text copyright (c) 2020 MariaDB Corporation Ab, All Rights Reserved.
"Business Source License" is a trademark of MariaDB Corporation Ab.
Parameters
Licensor: HashiCorp, Inc.
Licensed Work: Vault Version 1.15.0 or later. The Licensed Work is (c) 2023
HashiCorp, Inc.
Additional Use Grant: You may make production use of the Licensed Work, provided
Your use does not include offering the Licensed Work to third
parties on a hosted or embedded basis in order to compete with
HashiCorp's paid version(s) of the Licensed Work. For purposes
of this license:
A "competitive offering" is a Product that is offered to third
parties on a paid basis, including through paid support
arrangements, that significantly overlaps with the capabilities
of HashiCorp's paid version(s) of the Licensed Work. If Your
Product is not a competitive offering when You first make it
generally available, it will not become a competitive offering
later due to HashiCorp releasing a new version of the Licensed
Work with additional capabilities. In addition, Products that
are not provided on a paid basis are not competitive.
"Product" means software that is offered to end users to manage
in their own environments or offered as a service on a hosted
basis.
"Embedded" means including the source code or executable code
from the Licensed Work in a competitive offering. "Embedded"
also means packaging the competitive offering in such a way
that the Licensed Work must be accessed or downloaded for the
competitive offering to operate.
Hosting or using the Licensed Work(s) for internal purposes
within an organization is not considered a competitive
offering. HashiCorp considers your organization to include all
of your affiliates under common control.
For binding interpretive guidance on using HashiCorp products
under the Business Source License, please visit our FAQ.
(https://www.hashicorp.com/license-faq)
Change Date: Four years from the date the Licensed Work is published.
Change License: MPL 2.0
For information about alternative licensing arrangements for the Licensed Work,
please contact licensing@hashicorp.com.
Notice
Business Source License 1.1
Terms
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works, redistribute, and make non-production use of the Licensed Work. The
Licensor may make an Additional Use Grant, above, permitting limited production use.
Effective on the Change Date, or the fourth anniversary of the first publicly
available distribution of a specific version of the Licensed Work under this
License, whichever comes first, the Licensor hereby grants you rights under
the terms of the Change License, and the rights granted in the paragraph
above terminate.
If your use of the Licensed Work does not comply with the requirements
currently in effect as described in this License, you must purchase a
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resellers, or you must refrain from using the Licensed Work.
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for each version of the Licensed Work released by Licensor.
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of the Licensed Work. If you receive the Licensed Work in original or
modified form from a third party, the terms and conditions set forth in this
License apply to your use of that work.
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terminate your rights under this License for the current and all other
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Copyright (c) 2015 HashiCorp, Inc.
Mozilla Public License, version 2.0
1. Definitions
1.1. "Contributor"
means each individual or legal entity that creates, contributes to the
creation of, or owns Covered Software.
1.2. "Contributor Version"
means the combination of the Contributions of others (if any) used by a
Contributor and that particular Contributor's Contribution.
1.3. "Contribution"
means Covered Software of a particular Contributor.
1.4. "Covered Software"
means Source Code Form to which the initial Contributor has attached the
notice in Exhibit A, the Executable Form of such Source Code Form, and
Modifications of such Source Code Form, in each case including portions
thereof.
1.5. "Incompatible With Secondary Licenses"
means
a. that the initial Contributor has attached the notice described in
Exhibit B to the Covered Software; or
b. that the Covered Software was made available under the terms of
version 1.1 or earlier of the License, but not also under the terms of
a Secondary License.
1.6. "Executable Form"
means any form of the work other than Source Code Form.
1.7. "Larger Work"
means a work that combines Covered Software with other material, in a
separate file or files, that is not Covered Software.
1.8. "License"
means this document.
1.9. "Licensable"
means having the right to grant, to the maximum extent possible, whether
at the time of the initial grant or subsequently, any and all of the
rights conveyed by this License.
1.10. "Modifications"
means any of the following:
a. any file in Source Code Form that results from an addition to,
deletion from, or modification of the contents of Covered Software; or
b. any new file in Source Code Form that contains any Covered Software.
1.11. "Patent Claims" of a Contributor
means any patent claim(s), including without limitation, method,
process, and apparatus claims, in any patent Licensable by such
Contributor that would be infringed, but for the grant of the License,
by the making, using, selling, offering for sale, having made, import,
or transfer of either its Contributions or its Contributor Version.
1.12. "Secondary License"
means either the GNU General Public License, Version 2.0, the GNU Lesser
General Public License, Version 2.1, the GNU Affero General Public
License, Version 3.0, or any later versions of those licenses.
1.13. "Source Code Form"
means the form of the work preferred for making modifications.
1.14. "You" (or "Your")
means an individual or a legal entity exercising rights under this
License. For legal entities, "You" includes any entity that controls, is
controlled by, or is under common control with You. For purposes of this
definition, "control" means (a) the power, direct or indirect, to cause
the direction or management of such entity, whether by contract or
otherwise, or (b) ownership of more than fifty percent (50%) of the
outstanding shares or beneficial ownership of such entity.
2. License Grants and Conditions
2.1. Grants
Each Contributor hereby grants You a world-wide, royalty-free,
non-exclusive license:
a. under intellectual property rights (other than patent or trademark)
Licensable by such Contributor to use, reproduce, make available,
modify, display, perform, distribute, and otherwise exploit its
Contributions, either on an unmodified basis, with Modifications, or
as part of a Larger Work; and
b. under Patent Claims of such Contributor to make, use, sell, offer for
sale, have made, import, and otherwise transfer either its
Contributions or its Contributor Version.
2.2. Effective Date
The licenses granted in Section 2.1 with respect to any Contribution
become effective for each Contribution on the date the Contributor first
distributes such Contribution.
2.3. Limitations on Grant Scope
The licenses granted in this Section 2 are the only rights granted under
this License. No additional rights or licenses will be implied from the
distribution or licensing of Covered Software under this License.
Notwithstanding Section 2.1(b) above, no patent license is granted by a
Contributor:
a. for any code that a Contributor has removed from Covered Software; or
b. for infringements caused by: (i) Your and any other third party's
modifications of Covered Software, or (ii) the combination of its
Contributions with other software (except as part of its Contributor
Version); or
c. under Patent Claims infringed by Covered Software in the absence of
its Contributions.
This License does not grant any rights in the trademarks, service marks,
or logos of any Contributor (except as may be necessary to comply with
the notice requirements in Section 3.4).
2.4. Subsequent Licenses
No Contributor makes additional grants as a result of Your choice to
distribute the Covered Software under a subsequent version of this
License (see Section 10.2) or under the terms of a Secondary License (if
permitted under the terms of Section 3.3).
2.5. Representation
Each Contributor represents that the Contributor believes its
Contributions are its original creation(s) or it has sufficient rights to
grant the rights to its Contributions conveyed by this License.
2.6. Fair Use
This License is not intended to limit any rights You have under
applicable copyright doctrines of fair use, fair dealing, or other
equivalents.
2.7. Conditions
Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
Section 2.1.
3. Responsibilities
3.1. Distribution of Source Form
All distribution of Covered Software in Source Code Form, including any
Modifications that You create or to which You contribute, must be under
the terms of this License. You must inform recipients that the Source
Code Form of the Covered Software is governed by the terms of this
License, and how they can obtain a copy of this License. You may not
attempt to alter or restrict the recipients' rights in the Source Code
Form.
3.2. Distribution of Executable Form
If You distribute Covered Software in Executable Form then:
a. such Covered Software must also be made available in Source Code Form,
as described in Section 3.1, and You must inform recipients of the
Executable Form how they can obtain a copy of such Source Code Form by
reasonable means in a timely manner, at a charge no more than the cost
of distribution to the recipient; and
b. You may distribute such Executable Form under the terms of this
License, or sublicense it under different terms, provided that the
license for the Executable Form does not attempt to limit or alter the
recipients' rights in the Source Code Form under this License.
3.3. Distribution of a Larger Work
You may create and distribute a Larger Work under terms of Your choice,
provided that You also comply with the requirements of this License for
the Covered Software. If the Larger Work is a combination of Covered
Software with a work governed by one or more Secondary Licenses, and the
Covered Software is not Incompatible With Secondary Licenses, this
License permits You to additionally distribute such Covered Software
under the terms of such Secondary License(s), so that the recipient of
the Larger Work may, at their option, further distribute the Covered
Software under the terms of either this License or such Secondary
License(s).
3.4. Notices
You may not remove or alter the substance of any license notices
(including copyright notices, patent notices, disclaimers of warranty, or
limitations of liability) contained within the Source Code Form of the
Covered Software, except that You may alter any license notices to the
extent required to remedy known factual inaccuracies.
3.5. Application of Additional Terms
You may choose to offer, and to charge a fee for, warranty, support,
indemnity or liability obligations to one or more recipients of Covered
Software. However, You may do so only on Your own behalf, and not on
behalf of any Contributor. You must make it absolutely clear that any
such warranty, support, indemnity, or liability obligation is offered by
You alone, and You hereby agree to indemnify every Contributor for any
liability incurred by such Contributor as a result of warranty, support,
indemnity or liability terms You offer. You may include additional
disclaimers of warranty and limitations of liability specific to any
jurisdiction.
4. Inability to Comply Due to Statute or Regulation
If it is impossible for You to comply with any of the terms of this License
with respect to some or all of the Covered Software due to statute,
judicial order, or regulation then You must: (a) comply with the terms of
this License to the maximum extent possible; and (b) describe the
limitations and the code they affect. Such description must be placed in a
text file included with all distributions of the Covered Software under
this License. Except to the extent prohibited by statute or regulation,
such description must be sufficiently detailed for a recipient of ordinary
skill to be able to understand it.
5. Termination
5.1. The rights granted under this License will terminate automatically if You
fail to comply with any of its terms. However, if You become compliant,
then the rights granted under this License from a particular Contributor
are reinstated (a) provisionally, unless and until such Contributor
explicitly and finally terminates Your grants, and (b) on an ongoing
basis, if such Contributor fails to notify You of the non-compliance by
some reasonable means prior to 60 days after You have come back into
compliance. Moreover, Your grants from a particular Contributor are
reinstated on an ongoing basis if such Contributor notifies You of the
non-compliance by some reasonable means, this is the first time You have
received notice of non-compliance with this License from such
Contributor, and You become compliant prior to 30 days after Your receipt
of the notice.
5.2. If You initiate litigation against any entity by asserting a patent
infringement claim (excluding declaratory judgment actions,
counter-claims, and cross-claims) alleging that a Contributor Version
directly or indirectly infringes any patent, then the rights granted to
You by any and all Contributors for the Covered Software under Section
2.1 of this License shall terminate.
5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
license agreements (excluding distributors and resellers) which have been
validly granted by You or Your distributors under this License prior to
termination shall survive termination.
6. Disclaimer of Warranty
Covered Software is provided under this License on an "as is" basis,
without warranty of any kind, either expressed, implied, or statutory,
including, without limitation, warranties that the Covered Software is free
of defects, merchantable, fit for a particular purpose or non-infringing.
The entire risk as to the quality and performance of the Covered Software
is with You. Should any Covered Software prove defective in any respect,
You (not any Contributor) assume the cost of any necessary servicing,
repair, or correction. This disclaimer of warranty constitutes an essential
part of this License. No use of any Covered Software is authorized under
this License except under this disclaimer.
7. Limitation of Liability
Under no circumstances and under no legal theory, whether tort (including
negligence), contract, or otherwise, shall any Contributor, or anyone who
distributes Covered Software as permitted above, be liable to You for any
direct, indirect, special, incidental, or consequential damages of any
character including, without limitation, damages for lost profits, loss of
goodwill, work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses, even if such party shall have been
informed of the possibility of such damages. This limitation of liability
shall not apply to liability for death or personal injury resulting from
such party's negligence to the extent applicable law prohibits such
limitation. Some jurisdictions do not allow the exclusion or limitation of
incidental or consequential damages, so this exclusion and limitation may
not apply to You.
8. Litigation
Any litigation relating to this License may be brought only in the courts
of a jurisdiction where the defendant maintains its principal place of
business and such litigation shall be governed by laws of that
jurisdiction, without reference to its conflict-of-law provisions. Nothing
in this Section shall prevent a party's ability to bring cross-claims or
counter-claims.
9. Miscellaneous
This License represents the complete agreement concerning the subject
matter hereof. If any provision of this License is held to be
unenforceable, such provision shall be reformed only to the extent
necessary to make it enforceable. Any law or regulation which provides that
the language of a contract shall be construed against the drafter shall not
be used to construe this License against a Contributor.
10. Versions of the License
10.1. New Versions
Mozilla Foundation is the license steward. Except as provided in Section
10.3, no one other than the license steward has the right to modify or
publish new versions of this License. Each version will be given a
distinguishing version number.
10.2. Effect of New Versions
You may distribute the Covered Software under the terms of the version
of the License under which You originally received the Covered Software,
or under the terms of any subsequent version published by the license
steward.
10.3. Modified Versions
If you create software not governed by this License, and you want to
create a new license for such software, you may create and use a
modified version of this License if you rename the license and remove
any references to the name of the license steward (except to note that
such modified license differs from this License).
10.4. Distributing Source Code Form that is Incompatible With Secondary
Licenses If You choose to distribute Source Code Form that is
Incompatible With Secondary Licenses under the terms of this version of
the License, the notice described in Exhibit B of this License must be
attached.
Exhibit A - Source Code Form License Notice
This Source Code Form is subject to the
terms of the Mozilla Public License, v.
2.0. If a copy of the MPL was not
distributed with this file, You can
obtain one at
http://mozilla.org/MPL/2.0/.
If it is not possible or desirable to put the notice in a particular file,
then You may include the notice in a location (such as a LICENSE file in a
relevant directory) where a recipient would be likely to look for such a
notice.
You may add additional accurate notices of copyright ownership.
Exhibit B - "Incompatible With Secondary Licenses" Notice
This Source Code Form is "Incompatible
With Secondary Licenses", as defined by
the Mozilla Public License, v. 2.0.

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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
package shamir
import (
"crypto/rand"
"crypto/subtle"
"fmt"
mathrand "math/rand"
"time"
)
const (
// ShareOverhead is the byte size overhead of each share
// when using Split on a secret. This is caused by appending
// a one byte tag to the share.
ShareOverhead = 1
)
// polynomial represents a polynomial of arbitrary degree
type polynomial struct {
coefficients []uint8
}
// makePolynomial constructs a random polynomial of the given
// degree but with the provided intercept value.
func makePolynomial(intercept, degree uint8) (polynomial, error) {
// Create a wrapper
p := polynomial{
coefficients: make([]byte, degree+1),
}
// Ensure the intercept is set
p.coefficients[0] = intercept
// Assign random co-efficients to the polynomial
if _, err := rand.Read(p.coefficients[1:]); err != nil {
return p, err
}
return p, nil
}
// evaluate returns the value of the polynomial for the given x
func (p *polynomial) evaluate(x uint8) uint8 {
// Special case the origin
if x == 0 {
return p.coefficients[0]
}
// Compute the polynomial value using Horner's method.
degree := len(p.coefficients) - 1
out := p.coefficients[degree]
for i := degree - 1; i >= 0; i-- {
coeff := p.coefficients[i]
out = add(mult(out, x), coeff)
}
return out
}
// interpolatePolynomial takes N sample points and returns
// the value at a given x using a lagrange interpolation.
func interpolatePolynomial(x_samples, y_samples []uint8, x uint8) uint8 {
limit := len(x_samples)
var result, basis uint8
for i := 0; i < limit; i++ {
basis = 1
for j := 0; j < limit; j++ {
if i == j {
continue
}
num := add(x, x_samples[j])
denom := add(x_samples[i], x_samples[j])
term := div(num, denom)
basis = mult(basis, term)
}
group := mult(y_samples[i], basis)
result = add(result, group)
}
return result
}
// div divides two numbers in GF(2^8)
func div(a, b uint8) uint8 {
if b == 0 {
// leaks some timing information but we don't care anyways as this
// should never happen, hence the panic
panic("divide by zero")
}
ret := int(mult(a, inverse(b)))
// Ensure we return zero if a is zero but aren't subject to timing attacks
ret = subtle.ConstantTimeSelect(subtle.ConstantTimeByteEq(a, 0), 0, ret)
return uint8(ret)
}
// inverse calculates the inverse of a number in GF(2^8)
func inverse(a uint8) uint8 {
b := mult(a, a)
c := mult(a, b)
b = mult(c, c)
b = mult(b, b)
c = mult(b, c)
b = mult(b, b)
b = mult(b, b)
b = mult(b, c)
b = mult(b, b)
b = mult(a, b)
return mult(b, b)
}
// mult multiplies two numbers in GF(2^8)
func mult(a, b uint8) (out uint8) {
var r uint8 = 0
var i uint8 = 8
for i > 0 {
i--
r = (-(b >> i & 1) & a) ^ (-(r >> 7) & 0x1B) ^ (r + r)
}
return r
}
// add combines two numbers in GF(2^8)
// This can also be used for subtraction since it is symmetric.
func add(a, b uint8) uint8 {
return a ^ b
}
// Split takes an arbitrarily long secret and generates a `parts`
// number of shares, `threshold` of which are required to reconstruct
// the secret. The parts and threshold must be at least 2, and less
// than 256. The returned shares are each one byte longer than the secret
// as they attach a tag used to reconstruct the secret.
func Split(secret []byte, parts, threshold int) ([][]byte, error) {
// Sanity check the input
if parts < threshold {
return nil, fmt.Errorf("parts cannot be less than threshold")
}
if parts > 255 {
return nil, fmt.Errorf("parts cannot exceed 255")
}
if threshold < 2 {
return nil, fmt.Errorf("threshold must be at least 2")
}
if threshold > 255 {
return nil, fmt.Errorf("threshold cannot exceed 255")
}
if len(secret) == 0 {
return nil, fmt.Errorf("cannot split an empty secret")
}
// Generate random list of x coordinates
mathrand.Seed(time.Now().UnixNano())
xCoordinates := mathrand.Perm(255)
// Allocate the output array, initialize the final byte
// of the output with the offset. The representation of each
// output is {y1, y2, .., yN, x}.
out := make([][]byte, parts)
for idx := range out {
out[idx] = make([]byte, len(secret)+1)
out[idx][len(secret)] = uint8(xCoordinates[idx]) + 1
}
// Construct a random polynomial for each byte of the secret.
// Because we are using a field of size 256, we can only represent
// a single byte as the intercept of the polynomial, so we must
// use a new polynomial for each byte.
for idx, val := range secret {
p, err := makePolynomial(val, uint8(threshold-1))
if err != nil {
return nil, fmt.Errorf("failed to generate polynomial: %w", err)
}
// Generate a `parts` number of (x,y) pairs
// We cheat by encoding the x value once as the final index,
// so that it only needs to be stored once.
for i := 0; i < parts; i++ {
x := uint8(xCoordinates[i]) + 1
y := p.evaluate(x)
out[i][idx] = y
}
}
// Return the encoded secrets
return out, nil
}
// Combine is used to reverse a Split and reconstruct a secret
// once a `threshold` number of parts are available.
func Combine(parts [][]byte) ([]byte, error) {
// Verify enough parts provided
if len(parts) < 2 {
return nil, fmt.Errorf("less than two parts cannot be used to reconstruct the secret")
}
// Verify the parts are all the same length
firstPartLen := len(parts[0])
if firstPartLen < 2 {
return nil, fmt.Errorf("parts must be at least two bytes")
}
for i := 1; i < len(parts); i++ {
if len(parts[i]) != firstPartLen {
return nil, fmt.Errorf("all parts must be the same length")
}
}
// Create a buffer to store the reconstructed secret
secret := make([]byte, firstPartLen-1)
// Buffer to store the samples
x_samples := make([]uint8, len(parts))
y_samples := make([]uint8, len(parts))
// Set the x value for each sample and ensure no x_sample values are the same,
// otherwise div() can be unhappy
checkMap := map[byte]bool{}
for i, part := range parts {
samp := part[firstPartLen-1]
if exists := checkMap[samp]; exists {
return nil, fmt.Errorf("duplicate part detected")
}
checkMap[samp] = true
x_samples[i] = samp
}
// Reconstruct each byte
for idx := range secret {
// Set the y value for each sample
for i, part := range parts {
y_samples[i] = part[idx]
}
// Interpolate the polynomial and compute the value at 0
val := interpolatePolynomial(x_samples, y_samples, 0)
// Evaluate the 0th value to get the intercept
secret[idx] = val
}
return secret, nil
}