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lines changed Original file line number Diff line number Diff line change @@ -719,6 +719,28 @@ console.log(sign.sign(private_key, 'hex'));
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// Prints the calculated signature
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```
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+ A [ ` sign ` ] [ ] instance can also be created by just passing in the digest
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+ algorithm name, in which case OpenSSL will infer the full signature algorithm
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+ from the type of the PEM-formatted private key, including algorithms that
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+ do not have directly exposed name constants, e.g. 'ecdsa-with-SHA256'.
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+
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+ Example: signing using ECDSA with SHA256
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+ ``` js
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+ const crypto = require (' crypto' );
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+ const sign = crypto .createSign (' sha256' );
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+
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+ sign .update (' some data to sign' );
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+
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+ const private_key = ' -----BEGIN EC PRIVATE KEY-----\n ' +
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+ ' MHcCAQEEIF+jnWY1D5kbVYDNvxxo/Y+ku2uJPDwS0r/VuPZQrjjVoAoGCCqGSM49\n ' +
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+ ' AwEHoUQDQgAEurOxfSxmqIRYzJVagdZfMMSjRNNhB8i3mXyIMq704m2m52FdfKZ2\n ' +
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+ ' pQhByd5eyj3lgZ7m7jbchtdgyOF8Io/1ng==\n ' +
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+ ' -----END EC PRIVATE KEY-----\n ' ;
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+
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+ console .log (sign .sign (private_key).toString (' hex' ));
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+ ```
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+
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### sign.sign(private_key[ , output_format] )
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Calculates the signature on all the data passed through using either
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