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Bitcoin Libraries Secp256k1 C by claude-dev-suite

Name: Bitcoin Libraries Secp256k1 C
Rating: 4.2 (5 reviews)
Author: claude-dev-suite

Bitcoin Libraries Secp256k1 C

libsecp256k1: the canonical secp256k1 C library. Used by Bitcoin Core, rust-secp256k1, all major language bindings. USE WHEN: low-level crypto in C/C++, building bindings, performance- critical paths.

claude-dev-suite Updated Sep 8, 2026 28 repo stars

File contents

libsecp256k1

The canonical C library for secp256k1. Maintained by Bitcoin Core team; constant-time, optimized.

Repo: github.com/bitcoin-core/secp256k1.

Build

git clone https://github.com/bitcoin-core/secp256k1
cd secp256k1
./autogen.sh
./configure --enable-module-recovery --enable-module-schnorrsig \
    --enable-module-extrakeys --enable-module-musig
make
make install

Modules

Default: ECDSA.
extrakeys — x-only pubkeys (BIP340).
schnorrsig — Schnorr signatures (BIP340).
recovery — recoverable ECDSA.
ecdh — ECDH.
musig — MuSig2 (BIP327).
frost — FROST (experimental).
whitebox — internal testing.

API

C API:

#include <secp256k1.h>
#include <secp256k1_schnorrsig.h>

secp256k1_context* ctx = secp256k1_context_create(SECP256K1_CONTEXT_NONE);

unsigned char seckey[32] = {...};
secp256k1_pubkey pubkey;
secp256k1_ec_pubkey_create(ctx, &pubkey, seckey);

unsigned char sig[64];
secp256k1_schnorrsig_sign32(ctx, sig, msg32, &keypair, NULL);

int valid = secp256k1_schnorrsig_verify(ctx, sig, msg32, 32, &xonly);

Properties

Constant-time everywhere.
Endomorphism-optimized scalar mult.
Bindings: rust, python, JS (wasm), Go, JVM, etc.

Use cases

Bitcoin Core's signing engine.
All language bindings build on this.
Performance-critical apps.

Common pitfalls

secp256k1_context_destroy to avoid leaks.
Compilation flags matter: enable required modules at build time.
Keys / signatures must be byte-validated before passing to API (length, range).

---name: bitcoin-libraries-secp256k1-cdescription: libsecp256k1: the canonical secp256k1 C library. Used by Bitcoin Core, rust-secp256k1, all major language bindings. USE WHEN: low-level crypto in C/C++, building bindings, performance- critical paths.---# libsecp256k1The canonical C library for secp256k1. Maintained by Bitcoin Coreteam; constant-time, optimized.Repo: `github.com/bitcoin-core/secp256k1`.## Build```bashgit clone https://github.com/bitcoin-core/secp256k1cd secp256k1./autogen.sh./configure --enable-module-recovery --enable-module-schnorrsig \ --enable-module-extrakeys --enable-module-musigmakemake install```## Modules- Default: ECDSA.- `extrakeys` — x-only pubkeys (BIP340).- `schnorrsig` — Schnorr signatures (BIP340).- `recovery` — recoverable ECDSA.- `ecdh` — ECDH.- `musig` — MuSig2 (BIP327).- `frost` — FROST (experimental).- `whitebox` — internal testing.## APIC API:```c#include <secp256k1.h>#include <secp256k1_schnorrsig.h>secp256k1_context* ctx = secp256k1_context_create(SECP256K1_CONTEXT_NONE);unsigned char seckey[32] = {...};secp256k1_pubkey pubkey;secp256k1_ec_pubkey_create(ctx, &pubkey, seckey);unsigned char sig[64];secp256k1_schnorrsig_sign32(ctx, sig, msg32, &keypair, NULL);int valid = secp256k1_schnorrsig_verify(ctx, sig, msg32, 32, &xonly);```## Properties- Constant-time everywhere.- Endomorphism-optimized scalar mult.- Bindings: rust, python, JS (wasm), Go, JVM, etc.## Use cases- Bitcoin Core's signing engine.- All language bindings build on this.- Performance-critical apps.## Common pitfalls- `secp256k1_context_destroy` to avoid leaks.- Compilation flags matter: enable required modules at build time.- Keys / signatures must be byte-validated before passing to API (length, range).## See also- [secp256k1-rs/SKILL.md](../secp256k1-rs/SKILL.md)- [../../cryptography/secp256k1/SKILL.md](../../cryptography/secp256k1/SKILL.md)- [../../cryptography/schnorr/SKILL.md](../../cryptography/schnorr/SKILL.md)- [../../cryptography/musig2/SKILL.md](../../cryptography/musig2/SKILL.md)

Frequently asked questions