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passagemath-libecm

library10.8.4pypypiunverified

passagemath-libecm provides Python bindings to GMP-ECM for elliptic curve method (ECM) integer factorization. Version 10.8.4 supports Python 3.11-3.14. It is part of the passagemath ecosystem and is released on a regular cadence alongside other components.

data

pip install passagemath-libecm

github ↗package ↗docs ↗changelog ↗

INSTALL

IMPORT

SIG · PASSAGEMATH-LIBECM

passagemath-libecm

datapythonv10.8.4

Install

6.8s avg

Import

—

Disk

250MB

Pass rate

8/ 10

Env Coverage8 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v10.6.48 · pip install

no network on importno background threads

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

glibc

py 3.10

✓ —

✓ 7.1s

py 3.11

✓ —

✓ 7s

py 3.12

✓ —

✓ 5.9s

py 3.13

✕ build_error

py 3.9

✓ —

✓ 7.1s

250MB installed

● package 250MB

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

find_factor

✓ from passagemath_libecm import find_factor

✗ from passagemath.libecm import find_factor

Basic usage: attempt integer factorization with ECM using the find_factor function.

from passagemath.libecm import find_factor # Factor a composite number n = 9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 B1 = 1000000 B2 = 100000000 result = find_factor(n, B1, B2) print('Found factor:' if result else 'No factor found')

Debug

Known issues

breakingThe function signature changed between 10.8.2 and 10.8.3: the 'seed' parameter was removed and replaced by an internal RNG. Code using 'seed' will raise TypeError.

fix

Remove the seed argument; RNG is now seeded automatically.

affects: >=10.8.3

gotchaDo not import directly from 'ecm' or 'libecm' - the correct top-level module is 'passagemath.libecm'.

fix

Use 'from passagemath.libecm import ...'

affects: all

deprecatedThe 'curves' argument in ECM constructor is deprecated; use 'ncurves' instead.

fix

Replace curves=10 with ncurves=10

affects: >=10.8.0

gotchaPassing large numbers (over ~1000 digits) may hang or exhaust memory; tune B1/B2 appropriately.

fix

Reduce B1 bounds or use the 'max_stage2_input' parameter.

affects: all

Upgrade

Version history

10.8.4latest on PyPI · released Apr 20, 2026

Audit

Dependencies

gmpy2requiredRequired for MPZ arithmetic used in the ECM implementation.

passagemath-sageoptionalOften used side-by-side for number theory; not strictly required.

Agent activity

2 hits · last 30 days

node

Resources

githubhttps://github.com/passagemath/passagemath ↗

packagehttps://pypi.org/project/passagemath-libecm/ ↗

docshttps://passagemath.org/docs/latest ↗

changeloghttps://github.com/passagemath/passagemath/releases ↗