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BLS Signatures implementation

PyPI PyPI - Format GitHub

NOTE: THIS LIBRARY IS NOT YET FORMALLY REVIEWED FOR SECURITY

NOTE: THIS LIBRARY WAS SHIFTED TO THE IETF BLS SPECIFICATION ON 7/16/20

Implements BLS signatures with aggregation using blst library for cryptographic primitives (pairings, EC, hashing) according to the IETF BLS RFC with these curve parameters for BLS12-381. The blst library has been audited.

Features:

Non-interactive signature aggregation following IETF specification
Works on Windows, Mac, Linux, BSD, arm64, RISC-V
Efficient verification using Proof of Posssesion (only one pairing per distinct message)
Aggregate public keys and private keys
EIP-2333 key derivation (including unhardened BIP-32-like keys)
Key and signature serialization
Batch verification
Python bindings
Pure python bls12-381 and signatures
JavaScript bindings

Before you start

This library uses minimum public key sizes (MPL). A G2Element is a signature (96 bytes), and a G1Element is a public key (48 bytes). A private key is a 32 byte integer. There are three schemes: Basic, Augmented, and ProofOfPossession. Augmented should be enough for most use cases, and ProofOfPossession can be used where verification must be fast.

Import the library

#include "bls.hpp"
using namespace bls;

Creating keys and signatures

// Example seed, used to generate private key. Always use
// a secure RNG with sufficient entropy to generate a seed (at least 32 bytes).
vector<uint8_t> seed = {0,  50, 6,  244, 24,  199, 1,  25,  52,  88,  192,
                        19, 18, 12, 89,  6,   220, 18, 102, 58,  209, 82,
                        12, 62, 89, 110, 182, 9,   44, 20,  254, 22};

PrivateKey sk = AugSchemeMPL().KeyGen(seed);
G1Element pk = sk.GetG1Element();

vector<uint8_t> message = {1, 2, 3, 4, 5};  // Message is passed in as a byte vector
G2Element signature = AugSchemeMPL().Sign(sk, message);

// Verify the signature
bool ok = AugSchemeMPL().Verify(pk, message, signature);

Serializing keys and signatures to bytes

vector<uint8_t> skBytes = sk.Serialize();
vector<uint8_t> pkBytes = pk.Serialize();
vector<uint8_t> signatureBytes = signature.Serialize();

cout << Util::HexStr(skBytes) << endl;    // 32 bytes printed in hex
cout << Util::HexStr(pkBytes) << endl;    // 48 bytes printed in hex
cout << Util::HexStr(signatureBytes) << endl;  // 96 bytes printed in hex

Loading keys and signatures from bytes

// Takes vector of 32 bytes
PrivateKey skc = PrivateKey::FromByteVector(skBytes);

// Takes vector of 48 bytes
pk = G1Element::FromByteVector(pkBytes);

// Takes vector of 96 bytes
signature = G2Element::FromByteVector(signatureBytes);

Create aggregate signatures

// Generate some more private keys
seed[0] = 1;
PrivateKey sk1 = AugSchemeMPL().KeyGen(seed);
seed[0] = 2;
PrivateKey sk2 = AugSchemeMPL().KeyGen(seed);
vector<uint8_t> message2 = {1, 2, 3, 4, 5, 6, 7};

// Generate first sig
G1Element pk1 = sk1.GetG1Element();
G2Element sig1 = AugSchemeMPL().Sign(sk1, message);

// Generate second sig
G1Element pk2 = sk2.GetG1Element();
G2Element sig2 = AugSchemeMPL().Sign(sk2, message2);

// Signatures can be non-interactively combined by anyone
G2Element aggSig = AugSchemeMPL().Aggregate({sig1, sig2});

ok = AugSchemeMPL().AggregateVerify({pk1, pk2}, {message, message2}, aggSig);

Arbitrary trees of aggregates

seed[0] = 3;
PrivateKey sk3 = AugSchemeMPL().KeyGen(seed);
G1Element pk3 = sk3.GetG1Element();
vector<uint8_t> message3 = {100, 2, 254, 88, 90, 45, 23};
G2Element sig3 = AugSchemeMPL().Sign(sk3, message3);


G2Element aggSigFinal = AugSchemeMPL().Aggregate({aggSig, sig3});
ok = AugSchemeMPL().AggregateVerify({pk1, pk2, pk3}, {message, message2, message3}, aggSigFinal);

Very fast verification with Proof of Possession scheme

// If the same message is signed, you can use Proof of Posession (PopScheme) for efficiency
// A proof of possession MUST be passed around with the PK to ensure security.

G2Element popSig1 = PopSchemeMPL().Sign(sk1, message);
G2Element popSig2 = PopSchemeMPL().Sign(sk2, message);
G2Element popSig3 = PopSchemeMPL().Sign(sk3, message);
G2Element pop1 = PopSchemeMPL().PopProve(sk1);
G2Element pop2 = PopSchemeMPL().PopProve(sk2);
G2Element pop3 = PopSchemeMPL().PopProve(sk3);

ok = PopSchemeMPL().PopVerify(pk1, pop1);
ok = PopSchemeMPL().PopVerify(pk2, pop2);
ok = PopSchemeMPL().PopVerify(pk3, pop3);
G2Element popSigAgg = PopSchemeMPL().Aggregate({popSig1, popSig2, popSig3});

ok = PopSchemeMPL().FastAggregateVerify({pk1, pk2, pk3}, message, popSigAgg);

// Aggregate public key, indistinguishable from a single public key
G1Element popAggPk = pk1 + pk2 + pk3;
ok = PopSchemeMPL().Verify(popAggPk, message, popSigAgg);

// Aggregate private keys
PrivateKey aggSk = PrivateKey::Aggregate({sk1, sk2, sk3});
ok = (PopSchemeMPL().Sign(aggSk, message) == popSigAgg);

HD keys using EIP-2333

// You can derive 'child' keys from any key, to create arbitrary trees. 4 byte indeces are used.
// Hardened (more secure, but no parent pk -> child pk)
PrivateKey masterSk = AugSchemeMPL().KeyGen(seed);
PrivateKey child = AugSchemeMPL().DeriveChildSk(masterSk, 152);
PrivateKey grandChild = AugSchemeMPL().DeriveChildSk(child, 952)

// Unhardened (less secure, but can go from parent pk -> child pk), BIP32 style
G1Element masterPk = masterSk.GetG1Element();
PrivateKey childU = AugSchemeMPL().DeriveChildSkUnhardened(masterSk, 22);
PrivateKey grandchildU = AugSchemeMPL().DeriveChildSkUnhardened(childU, 0);

G1Element childUPk = AugSchemeMPL().DeriveChildPkUnhardened(masterPk, 22);
G1Element grandchildUPk = AugSchemeMPL().DeriveChildPkUnhardened(childUPk, 0);

ok = (grandchildUPk == grandchildU.GetG1Element();

Build

Cmake 3.14+, a c++ compiler, python3 and python[3.x]-dev (for bindings) are required for building.

mkdir build
cd build
cmake ../
cmake --build . -- -j 6

Run tests

./build/src/runtest

Run benchmarks

./build/src/runbench

On a 3.5 GHz i7 Mac, verification takes about 1.1ms per signature, and signing takes 1.3ms.

Link the library to use it

g++ -Wl,-no_pie -std=c++11 -Ibls-signatures/src -L./bls-signatures/build/ -l bls yourapp.cpp

Notes on dependencies

We use Libsodium which provides secure memory allocation. To install it, either download them from github and follow the instructions for each repo, or use a package manager like APT or brew. You can follow the recipe used to build python wheels for multiple platforms in .github/workflows/.

Discussion

Discussion about this library and other Chia related development is in the #chia-development channel of Chia's Discord.

Code style

Always use vector<uint8_t> for bytes
Use size_t for size variables
Uppercase method names
Prefer static constructors
Avoid using templates
Objects allocate and free their own memory
Use cpplint with default rules
Use SecAlloc and SecFree when handling secrets

ci Building

The primary build process for this repository is to use GitHub Actions to build binary wheels for MacOS, Linux (x64 and aarch64), and Windows and publish them with a source wheel on PyPi. MacOS ARM64 is also supported. See .github/workflows/build.yml. CMake uses FetchContent to download pybind11 for the Python bindings. Building is then managed by cibuildwheel. Further installation is then available via pip install blspy e.g. The ci builds include a statically linked libsodium.

Contributing and workflow

Contributions are welcome and more details are available in chia-blockchain's CONTRIBUTING.md.

The main branch is usually the currently released latest version on PyPI. Note that at times bls-signatures/blspy will be ahead of the release version that chia-blockchain requires in it's main/release version in preparation for a new chia-blockchain release. Please branch or fork main and then create a pull request to the main branch. Linear merging is enforced on main and merging requires a completed review. PRs will kick off a GitHub actions ci for building and testing.

Specification and test vectors

The IETF bls draft is followed. Test vectors can also be seen in the python and cpp test files.

Libsodium license

The libsodium static library is licensed under the ISC license which requires the following copyright notice.

ISC License

Copyright (c) 2013-2020 Frank Denis <j at pureftpd dot org>

Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

BLST license

BLST is used with the Apache 2.0 license

Metadata

Release files for blspy 2.0.3

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for blspy 2.0.3
File	Size	Uploaded
blspy-2.0.3.tar.gz	144.8 kB	Mar 21, 2024	Details

Built distributions (wheels)

Table of built distributions (wheels) for blspy 2.0.3
File	Interpreter	ABI	Platform	Reset
blspy-2.0.3-cp312-cp312-win_amd64.whl 268.5 kB Mar 21, 2024	CPython 3.12	CPython 3.12	Windows x86-64	Details
blspy-2.0.3-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 357.6 kB Mar 21, 2024	CPython 3.12	CPython 3.12	Linux glibc 2.17+ x86-64	Details
blspy-2.0.3-cp312-cp312-manylinux_2_17_aarch64.manylinux2014_aarch64.whl 330.3 kB Mar 21, 2024	CPython 3.12	CPython 3.12	Linux glibc 2.17+ ARM64	Details
blspy-2.0.3-cp312-cp312-macosx_11_0_x86_64.whl 323.5 kB Mar 21, 2024	CPython 3.12	CPython 3.12	macOS 11.0+ x86-64	Details
blspy-2.0.3-cp312-cp312-macosx_11_0_arm64.whl 305.0 kB Mar 21, 2024	CPython 3.12	CPython 3.12	macOS 11.0+ ARM64	Details
blspy-2.0.3-cp311-cp311-win_amd64.whl 269.0 kB Mar 21, 2024	CPython 3.11	CPython 3.11	Windows x86-64	Details
blspy-2.0.3-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 358.3 kB Mar 21, 2024	CPython 3.11	CPython 3.11	Linux glibc 2.17+ x86-64	Details
blspy-2.0.3-cp311-cp311-manylinux_2_17_aarch64.manylinux2014_aarch64.whl 333.4 kB Mar 21, 2024	CPython 3.11	CPython 3.11	Linux glibc 2.17+ ARM64	Details
blspy-2.0.3-cp311-cp311-macosx_11_0_x86_64.whl 321.8 kB Mar 21, 2024	CPython 3.11	CPython 3.11	macOS 11.0+ x86-64	Details
blspy-2.0.3-cp311-cp311-macosx_11_0_arm64.whl 305.1 kB Mar 21, 2024	CPython 3.11	CPython 3.11	macOS 11.0+ ARM64	Details
blspy-2.0.3-cp310-cp310-win_amd64.whl 267.6 kB Mar 21, 2024	CPython 3.10	CPython 3.10	Windows x86-64	Details
blspy-2.0.3-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 357.5 kB Mar 21, 2024	CPython 3.10	CPython 3.10	Linux glibc 2.17+ x86-64	Details
blspy-2.0.3-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl 331.6 kB Mar 21, 2024	CPython 3.10	CPython 3.10	Linux glibc 2.17+ ARM64	Details
blspy-2.0.3-cp310-cp310-macosx_11_0_x86_64.whl 320.6 kB Mar 21, 2024	CPython 3.10	CPython 3.10	macOS 11.0+ x86-64	Details
blspy-2.0.3-cp310-cp310-macosx_11_0_arm64.whl 303.9 kB Mar 21, 2024	CPython 3.10	CPython 3.10	macOS 11.0+ ARM64	Details
blspy-2.0.3-cp39-cp39-win_amd64.whl 262.1 kB Mar 21, 2024	CPython 3.9	CPython 3.9	Windows x86-64	Details
blspy-2.0.3-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 357.8 kB Mar 21, 2024	CPython 3.9	CPython 3.9	Linux glibc 2.17+ x86-64	Details
blspy-2.0.3-cp39-cp39-manylinux_2_17_aarch64.manylinux2014_aarch64.whl 331.9 kB Mar 21, 2024	CPython 3.9	CPython 3.9	Linux glibc 2.17+ ARM64	Details
blspy-2.0.3-cp39-cp39-macosx_11_0_x86_64.whl 320.6 kB Mar 21, 2024	CPython 3.9	CPython 3.9	macOS 11.0+ x86-64	Details
blspy-2.0.3-cp39-cp39-macosx_11_0_arm64.whl 304.0 kB Mar 21, 2024	CPython 3.9	CPython 3.9	macOS 11.0+ ARM64	Details
blspy-2.0.3-cp38-cp38-win_amd64.whl 267.4 kB Mar 21, 2024	CPython 3.8	CPython 3.8	Windows x86-64	Details
blspy-2.0.3-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 356.9 kB Mar 21, 2024	CPython 3.8	CPython 3.8	Linux glibc 2.17+ x86-64	Details
blspy-2.0.3-cp38-cp38-manylinux_2_17_aarch64.manylinux2014_aarch64.whl 331.1 kB Mar 21, 2024	CPython 3.8	CPython 3.8	Linux glibc 2.17+ ARM64	Details
blspy-2.0.3-cp38-cp38-macosx_11_0_x86_64.whl 320.3 kB Mar 21, 2024	CPython 3.8	CPython 3.8	macOS 11.0+ x86-64	Details
blspy-2.0.3-cp38-cp38-macosx_11_0_arm64.whl 303.7 kB Mar 21, 2024	CPython 3.8	CPython 3.8	macOS 11.0+ ARM64	Details

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Size	331.6 kB
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Upload date	Mar 21, 2024
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/5.0.0 CPython/3.12.2`

Release files / blspy-2.0.3-cp310-cp310-macosx_11_0_x86_64.whl

Download URL	blspy-2.0.3-cp310-cp310-macosx_11_0_x86_64.whl
Size	320.6 kB
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Upload date	Mar 21, 2024
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/5.0.0 CPython/3.12.2`

Release files / blspy-2.0.3-cp310-cp310-macosx_11_0_arm64.whl

Download URL	blspy-2.0.3-cp310-cp310-macosx_11_0_arm64.whl
Size	303.9 kB
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Upload date	Mar 21, 2024
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/5.0.0 CPython/3.12.2`

Release files / blspy-2.0.3-cp39-cp39-win_amd64.whl

Download URL	blspy-2.0.3-cp39-cp39-win_amd64.whl
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Upload date	Mar 21, 2024
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/5.0.0 CPython/3.12.2`

Release files / blspy-2.0.3-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl

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Upload date	Mar 21, 2024
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/5.0.0 CPython/3.12.2`

Release files / blspy-2.0.3-cp39-cp39-manylinux_2_17_aarch64.manylinux2014_aarch64.whl

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Size	331.9 kB
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Upload date	Mar 21, 2024
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Uploaded via	`twine/5.0.0 CPython/3.12.2`

Release files / blspy-2.0.3-cp39-cp39-macosx_11_0_x86_64.whl

Download URL	blspy-2.0.3-cp39-cp39-macosx_11_0_x86_64.whl
Size	320.6 kB
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Upload date	Mar 21, 2024
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/5.0.0 CPython/3.12.2`

Release files / blspy-2.0.3-cp39-cp39-macosx_11_0_arm64.whl

Download URL	blspy-2.0.3-cp39-cp39-macosx_11_0_arm64.whl
Size	304.0 kB
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Upload date	Mar 21, 2024
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/5.0.0 CPython/3.12.2`

Release files / blspy-2.0.3-cp38-cp38-win_amd64.whl

Download URL	blspy-2.0.3-cp38-cp38-win_amd64.whl
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Upload date	Mar 21, 2024
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/5.0.0 CPython/3.12.2`

Release files / blspy-2.0.3-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl

Download URL	blspy-2.0.3-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
Size	356.9 kB
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Upload date	Mar 21, 2024
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/5.0.0 CPython/3.12.2`

Release files / blspy-2.0.3-cp38-cp38-manylinux_2_17_aarch64.manylinux2014_aarch64.whl

Download URL	blspy-2.0.3-cp38-cp38-manylinux_2_17_aarch64.manylinux2014_aarch64.whl
Size	331.1 kB
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Upload date	Mar 21, 2024
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/5.0.0 CPython/3.12.2`

Release files / blspy-2.0.3-cp38-cp38-macosx_11_0_x86_64.whl

Download URL	blspy-2.0.3-cp38-cp38-macosx_11_0_x86_64.whl
Size	320.3 kB
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Upload date	Mar 21, 2024
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/5.0.0 CPython/3.12.2`

Release files / blspy-2.0.3-cp38-cp38-macosx_11_0_arm64.whl

Download URL	blspy-2.0.3-cp38-cp38-macosx_11_0_arm64.whl
Size	303.7 kB
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Upload date	Mar 21, 2024
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/5.0.0 CPython/3.12.2`