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doc: add example using algorithms not directly exposed

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PR-URL: https://github.com/nodejs/node/pull/6108
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Fedor Indutny <fedor.indutny@gmail.com>
This commit is contained in:
Brad Hill 2016-04-07 15:38:00 -07:00 committed by James M Snell
parent 7c9a691ee7
commit 945454894b
1 changed files with 22 additions and 0 deletions
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doc/api/crypto.markdown
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@ -734,6 +734,28 @@ console.log(sign.sign(private_key, 'hex'));
// Prints the calculated signature
```
A [`sign`][] instance can also be created by just passing in the digest
algorithm name, in which case OpenSSL will infer the full signature algorithm
from the type of the PEM-formatted private key, including algorithms that
do not have directly exposed name constants, e.g. 'ecdsa-with-SHA256'.
Example: signing using ECDSA with SHA256
```js
const crypto = require('crypto');
const sign = crypto.createSign('sha256');
sign.update('some data to sign');
const private_key = '-----BEGIN EC PRIVATE KEY-----\n' +
'MHcCAQEEIF+jnWY1D5kbVYDNvxxo/Y+ku2uJPDwS0r/VuPZQrjjVoAoGCCqGSM49\n' +
'AwEHoUQDQgAEurOxfSxmqIRYzJVagdZfMMSjRNNhB8i3mXyIMq704m2m52FdfKZ2\n' +
'pQhByd5eyj3lgZ7m7jbchtdgyOF8Io/1ng==\n' +
'-----END EC PRIVATE KEY-----\n';
console.log(sign.sign(private_key).toString('hex'));
```
### sign.sign(private_key[, output_format])
Calculates the signature on all the data passed through using either