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Firefox 146 supports compressed ECC key point format #28497

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Merged
hamishwillee merged 6 commits into from
Dec 9, 2025
Merged

Firefox 146 supports compressed ECC key point format #28497

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a22caa7
EC compressed data supported on import of EC key
hamishwillee Nov 21, 2025
342e6bc
Update api/SubtleCrypto.json
hamishwillee Nov 25, 2025
a380a85
Add spec link
hamishwillee Dec 2, 2025
e771fb0
Add subkeys for ECDH, ECDSA
hamishwillee Dec 8, 2025
851078d
Update api/SubtleCrypto.json
hamishwillee Dec 8, 2025
bfec9e8
Apply suggestions from code review
hamishwillee Dec 9, 2025
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168 changes: 166 additions & 2 deletions api/SubtleCrypto.json
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Original file line number Diff line number Diff line change
Expand Up @@ -1095,7 +1095,7 @@
{
"version_added": "1.17",
"partial_implementation": true,
"notes": "Not supported: ECDSA P-521, ECDH P-521."
"notes": "Not supported: ECDH P-521."
},
{
"version_added": "1.15",
Expand All @@ -1107,7 +1107,7 @@
"version_added": "1.14",
"version_removed": "1.15",
"partial_implementation": true,
"notes": "Not supported: ECDSA, ECDH, AES-CTR, AES-CBC, AES-GCM, AES-KW."
"notes": "Not supported: ECDH, AES-CTR, AES-CBC, AES-GCM, AES-KW."
}
],
"edge": [
Expand Down Expand Up @@ -1158,6 +1158,170 @@
"deprecated": false
}
},
"ECDH": {
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@hamishwillee hamishwillee Dec 8, 2025

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Following discussion in https://github.com/mdn/browser-compat-data/pull/28497/files#r2591982487 I've

  • added subfeatures for ECDH and ECDSA algorithms under importKey
  • Populated them with data from the importKey, in particular the partial implementation notes.
  • Just for the keys now covered, I have removed those notes from the partial implementation.
  • Make compressed_elliptic_curve_points a subkey of those.
  • As per https://github.com/mdn/browser-compat-data/pull/28497/files#r2596822093 there is also a lower leve which is the specific curve for the algorithm. Do we need these as subfeatures too? If so, as subfeatures of the method or of the algorithm>
  • I have not done all the other keys.

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@ddbeck ddbeck Dec 9, 2025

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This is stellar, Hamish! I was mostly trying to leave a paper trail for when someone (me?) eventually got around to fixing this, but you've gone above and beyond. Thank you!

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@hamishwillee hamishwillee Dec 9, 2025

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You're welcome. Keeping BCD correct is worth it.

"__compat": {
"description": "`ECDH` algorithm",
"mdn_url": "https://developer.mozilla.org/docs/Web/API/SubtleCrypto/importKey",
"spec_url": "https://w3c.github.io/webcrypto/#ecdh",
"support": {
"bun": {
"version_added": false
},
"chrome": {
"version_added": "37"
},
"chrome_android": "mirror",
"deno": {
"version_added": "1.18",
"partial_implementation": true,
"notes": "P-384 supported. Not supported: P-256, P-521."
},
"edge": "mirror",
"firefox": {
"version_added": "34"
},
"firefox_android": "mirror",
"nodejs": {
"version_added": false
},
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": "7"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
},
"compressed_elliptic_curve_points": {
"__compat": {
"description": "Key data can contain compressed elliptic curve points.",
"spec_url": "https://w3c.github.io/webcrypto/#ecdsa-operations-import-key",
"support": {
"chrome": {
"version_added": "≤80"
},
"chrome_android": "mirror",
"deno": {
"version_added": false
},
"edge": "mirror",
"firefox": {
"version_added": "146"
},
"firefox_android": "mirror",
"nodejs": {
"version_added": false
},
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": false
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
}
}
},
"ECDSA": {
"__compat": {
"description": "`ECDSA` algorithm",
"mdn_url": "https://developer.mozilla.org/docs/Web/API/SubtleCrypto/importKey",
"spec_url": "https://w3c.github.io/webcrypto/#ecdsa",
"support": {
"bun": {
"version_added": false
},
"chrome": {
"version_added": "37"
},
"chrome_android": "mirror",
"deno": {
"version_added": "1.18",
"partial_implementation": true,
"notes": "P-384 supported. Not supported: P-256, P-521."
},
"edge": "mirror",
"firefox": {
"version_added": "34"
},
"firefox_android": "mirror",
"nodejs": {
"version_added": false
},
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": "7"
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
},
"compressed_elliptic_curve_points": {
"__compat": {
"description": "Key data can contain compressed elliptic curve points.",
"spec_url": "https://w3c.github.io/webcrypto/#ecdsa-operations-import-key",
"support": {
"chrome": {
"version_added": "≤80"
},
"chrome_android": "mirror",
"deno": {
"version_added": false
},
"edge": "mirror",
"firefox": {
"version_added": "146"
},
"firefox_android": "mirror",
"nodejs": {
"version_added": false
},
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": false
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": false,
"standard_track": true,
"deprecated": false
}
}
}
},
"ed25519": {
"__compat": {
"description": "`Ed25519` algorithm",
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