kmackay/micro-ecc

Health v2 · maintenance only

Adoption not part of the score

1439 stars · 512 forks observed · 2026-10-19

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A small, fast C library implementing ECDH key exchange and ECDSA signatures for 8-bit, 32-bit, and 64-bit processors, with optional inline assembly for AVR, ARM, and Thumb. It uses no dynamic memory allocation, resists known side-channel attacks, and supports five standard NIST/SEC curves.

Use cases

• add elliptic curve cryptography to an Arduino or AVR microcontroller project
• implement ECDH key exchange on an embedded device with limited memory
• verify ECDSA signatures on an 8-bit or 32-bit microcontroller
• secure IoT device communication without dynamic memory allocation
• use secp256r1 or secp256k1 in a bare-metal C project
• add side-channel-resistant public-key crypto to firmware

When to choose

• you need ECDH or ECDSA on resource-constrained embedded hardware
• you want a tiny, dependency-free C library with no heap usage
• you target AVR, ARM, or Thumb platforms and want optimized assembly
• you need side-channel-resistant elliptic curve operations

When to avoid

• you need RSA or other non-elliptic-curve cryptography
• you want a full TLS stack rather than raw ECDH/ECDSA primitives
• you need curves beyond the five supported ones
• you prefer a high-level managed-language crypto library

Facets

library · maturity maintenance

cryptography security embedded security embedded-systems privacy embedded cpp c cross-platform iot ecc ecdh ecdsa elliptic-curve arduino microcontroller no-dynamic-allocation side-channel-resistant

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