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fix(interception): omit KEY_SIZE for EC keys with ecCurve

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AOSP keystore2 attestation lists KEY_SIZE only when there is no
authoritative key-shape tag. For EC keys the curve already pins the
key size, so emitting both KEY_SIZE and EC_CURVE is a forgery
fingerprint. Guard the createAuth call accordingly.
This commit is contained in:
Enginex0
2026-05-19 03:23:10 +01:00
parent ee7e5ba698
commit 59dfb2eb85
1 changed files with 3 additions and 1 deletions
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app/src/main/java/org/matrix/TEESimulator/interception/keystore/shim/KeyMintSecurityLevelInterceptor.kt
+2
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@@ -1068,7 +1068,9 @@ private fun KeyMintAttestation.toAuthorizations(
this.blockMode.forEach { authList.add(createAuth(Tag.BLOCK_MODE, KeyParameterValue.blockMode(it))) } this.blockMode.forEach { authList.add(createAuth(Tag.BLOCK_MODE, KeyParameterValue.blockMode(it))) }
this.digest.forEach { authList.add(createAuth(Tag.DIGEST, KeyParameterValue.digest(it))) } this.digest.forEach { authList.add(createAuth(Tag.DIGEST, KeyParameterValue.digest(it))) }
this.padding.forEach { authList.add(createAuth(Tag.PADDING, KeyParameterValue.paddingMode(it))) } this.padding.forEach { authList.add(createAuth(Tag.PADDING, KeyParameterValue.paddingMode(it))) }
if (this.algorithm != Algorithm.EC || this.ecCurve == null) {
authList.add(createAuth(Tag.KEY_SIZE, KeyParameterValue.integer(this.keySize))) authList.add(createAuth(Tag.KEY_SIZE, KeyParameterValue.integer(this.keySize)))
}
if (this.rsaPublicExponent != null) { if (this.rsaPublicExponent != null) {
authList.add(createAuth(Tag.RSA_PUBLIC_EXPONENT, KeyParameterValue.longInteger(this.rsaPublicExponent.toLong()))) authList.add(createAuth(Tag.RSA_PUBLIC_EXPONENT, KeyParameterValue.longInteger(this.rsaPublicExponent.toLong())))
} }