Repository: create-react-app
Issue: CRA does not appear to support Elliptic Curve Keys / Cryptography (ECC)
Labels: needs triage,issue: bug report

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### Describe the bug

I've created the most vanilla setup using the instructions with the environment variables `HTTPS=true`, `SSL_CRT_FILE=/cert/server.crt`, and `SSL_KEY_FILE=/cert/server.key`. When running `npm start`, I'm presented with the following error:
```
The certificate "/cert/server.crt" is invalid.
error:0608B096:digital envelope routines:EVP_PKEY_encrypt_init:operation not supported for this keytype
```

The certificate is valid and actively used in many projects. Only difference is they're [ECC](https://en.wikipedia.org/wiki/Elliptic-curve_cryptography) keys. Similar keys can be generated using [acme.sh](https://github.com/acmesh-official/acme.sh) with the following command:
`./acme.sh --issue -k ec-384 -ak 4096 --dns dns_cf -d dev.example.com -d example.com --home /cert`

### Did you try recovering your dependencies?

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This is a fresh project.
```
npm --version
7.6.1
```

### Which terms did you search for in User Guide?

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https, elliptic, certificates, etc.

### Environment

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Host is running up-to-date Debian 10 (Buster) and Docker v20.10.5 with the Official Node container. Command run within container:
```
Environment Info:

  current version of create-react-app: 4.0.3
  running from /root/.npm/_npx/c67e74de0542c87c/node_modules/create-react-app

  System:
    OS: Linux 4.19 Debian GNU/Linux 9 (stretch) 9 (stretch)
    CPU: (4) x64 Intel(R) Core(TM) i5-3570 CPU @ 3.40GHz
  Binaries:
    Node: 15.11.0 - /usr/local/bin/node
    Yarn: 1.22.5 - /usr/local/bin/yarn
    npm: 7.6.1 - /usr/local/bin/npm
  Browsers:
    Chrome: Not Found
    Firefox: Not Found
  npmPackages:
    react: ^17.0.1 => 17.0.1 
    react-dom: ^17.0.1 => 17.0.1 
    react-scripts: 4.0.3 => 4.0.3 
  npmGlobalPackages:
    create-react-app: Not Found
```

### Steps to reproduce

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1. Get free ECC certificates using acme.sh described above and place in `/cert`
2. `npx create-react-app my-app`
3. Set environment variables `HTTPS=true`, `SSL_CRT_FILE=/cert/server.crt`, and `SSL_KEY_FILE=/cert/server.key`
4. `npm start`

### Expected behavior

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I should see the landing page instead of an error. If I undefine the environment variable `HTTPS`, and adjust the address to http:// instead of https:// it works just fine.

### Actual behavior

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Immediate termination with following error:
```
The certificate "/cert/server.crt" is invalid.
error:0608B096:digital envelope routines:EVP_PKEY_encrypt_init:operation not supported for this keytype
```

### Reproducible demo

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I think this is as straight-forward as it comes aside from getting [Lets Encrypt](https://letsencrypt.org/) certificates. I could create a repo if it becomes necessary though.

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