Package Exports

ecdsa-wasm
ecdsa-wasm/index.js

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (ecdsa-wasm) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

ECSSA/secp256k1 + SHA-256

Abstract

This is a wasm version of mcl/ecdsa.h

News

serialize() supports the format defined at BitCoin

for Node.js

npm test

how to use

const ecdsa = require('ecdsa-wasm')

// create secret key
const sec = new ecdsa.SecretKey()

// initialize sec
sec.setByCSPRNG()

// get public key
const pub = sec.getPublicKey()

// make signature
const sig = sec.sign("abc")

// verify signatpure by pub
> pub.verify(sig, "abc")
true
> pub.verify(sig, "abcd")
false

// create precomputed public key(faster than pub)
const ppub = new ecdsa.PrecomputedPublicKey()
// initialize ppub
ppub.init(pub)

// verify signature by ppub
> ppub.verify(sig, "abc")
true
> ppub.verify(sig, "abcd")
false

// destroy ppub if unnecessary
ppub.destroy()

serialization

SecretKey.serialize() return 32-bytes Uint8Array as big-endian
PublicKey.serialize() return 65-bytes Uint8Array as 0x04 + x + y
PublicKey.serializeCompressed() return 33-bytes Uint8Array as 0x02 (y is even) or 0x03 (y is odd) + x
Signature.serialize() return DER-format
SecretKey.deserialize(a)
PublicKey.deserialize(a)
Signature.deserialize(a)
- take Uint8Array of a and constract the object

how to build ecdsa_c.js

Install emscripten.

git clone --recurse-submodules git@github.com:herumi/ecdsa-wasm
cd ecdsa-wasm
make -C src wasm

License

modified new BSD License http://opensource.org/licenses/BSD-3-Clause

Author

光成滋生 MITSUNARI Shigeo(herumi@nifty.com)