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doc: guide towards x509.fingerprint256 #42516

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Apr 1, 2022
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doc: guide towards x509.fingerprint256 #42516

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15 changes: 15 additions & 0 deletions doc/api/crypto.md
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Expand Up @@ -2627,6 +2627,10 @@ added: v15.6.0

The SHA-1 fingerprint of this certificate.

Because SHA-1 is cryptographically broken and because the security of SHA-1 is
significantly worse than that of algorithms that are commonly used to sign
certificates, consider using [`x509.fingerprint256`][] instead.

### `x509.fingerprint256`

<!-- YAML
Expand All @@ -2649,6 +2653,12 @@ added:

The SHA-512 fingerprint of this certificate.

Because computing the SHA-256 fingerprint is usually faster and because it is
only half the size of the SHA-512 fingerprint, [`x509.fingerprint256`][] may be
a better choice. While SHA-512 presumably provides a higher level of security in
general, the security of SHA-256 matches that of most algorithms that are
commonly used to sign certificates.

### `x509.infoAccess`

<!-- YAML
Expand Down Expand Up @@ -2738,6 +2748,10 @@ added: v15.6.0

The serial number of this certificate.

Serial numbers are assigned by certificate authorities and do not uniquely
identify certificates. Consider using [`x509.fingerprint256`][] as a unique
identifier instead.

### `x509.subject`

<!-- YAML
Expand Down Expand Up @@ -6137,6 +6151,7 @@ See the [list of SSL OP Flags][] for details.
[`util.promisify()`]: util.md#utilpromisifyoriginal
[`verify.update()`]: #verifyupdatedata-inputencoding
[`verify.verify()`]: #verifyverifyobject-signature-signatureencoding
[`x509.fingerprint256`]: #x509fingerprint256
[caveats when using strings as inputs to cryptographic APIs]: #using-strings-as-inputs-to-cryptographic-apis
[certificate object]: tls.md#certificate-object
[encoding]: buffer.md#buffers-and-character-encodings
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