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Error in the ecdsa Sign procedure ? #65

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2 changes: 1 addition & 1 deletion digital-signatures/ecdsa-sign-verify-messages.md
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Expand Up @@ -30,7 +30,7 @@ The ECDSA signing algorithm \([**RFC 6979**](https://tools.ietf.org/html/rfc6979
1. Calculate the message **hash**, using a cryptographic hash function like SHA-256: _**h**_ = hash\(_**msg**_\)
2. Generate securely a **random** number _**k**_ in the range \[1.._**n**_-1\]
* In case of **deterministic-ECDSA**, the value _**k**_ is HMAC-derived from _**h**_ + _**privKey**_ \(see [RFC 6979](https://tools.ietf.org/html/rfc6979#section-3.2)\)
3. Calculate the random point _**R**_ = _**k**_ \* **G** and take its x-coordinate: _**r**_ = _**R**_**.x**
3. Calculate the random point _**R**_ = _**k**_ \* **G** and take its x-coordinate modulo n : _**r**_ = $$R.x \pmod n$$
4. Calculate the signature proof: _**s**_ = $$k^{-1} * (h + r * privKey) \pmod n$$
* The modular inverse $$k^{-1} \pmod n$$ is an integer, such that $$k * k^{-1} \equiv 1 \pmod n$$
5. Return the **signature** {_**r**_, _**s**_}.
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