diff --git a/compatibility_matrices/compatibility_matrix.current.xml b/compatibility_matrices/compatibility_matrix.current.xml
index 416ac07..c39db36 100644
--- a/compatibility_matrices/compatibility_matrix.current.xml
+++ b/compatibility_matrices/compatibility_matrix.current.xml
@@ -343,7 +343,7 @@
     </hal>
     <hal format="aidl" optional="true">
         <name>android.hardware.security.keymint</name>
-        <version>1-2</version>
+        <version>1</version>
         <interface>
             <name>IKeyMintDevice</name>
             <instance>default</instance>
@@ -352,7 +352,6 @@
     </hal>
     <hal format="aidl" optional="true">
         <name>android.hardware.security.keymint</name>
-        <version>1-2</version>
         <interface>
             <name>IRemotelyProvisionedComponent</name>
             <instance>default</instance>
diff --git a/security/keymint/aidl/Android.bp b/security/keymint/aidl/Android.bp
index dcbe9c1..3cf6ff2 100644
--- a/security/keymint/aidl/Android.bp
+++ b/security/keymint/aidl/Android.bp
@@ -45,14 +45,14 @@
 cc_defaults {
     name: "keymint_use_latest_hal_aidl_ndk_static",
     static_libs: [
-        "android.hardware.security.keymint-V2-ndk",
+        "android.hardware.security.keymint-V1-ndk",
     ],
 }
 
 cc_defaults {
     name: "keymint_use_latest_hal_aidl_ndk_shared",
     shared_libs: [
-        "android.hardware.security.keymint-V2-ndk",
+        "android.hardware.security.keymint-V1-ndk",
     ],
 }
 
@@ -62,6 +62,6 @@
 rust_defaults {
     name: "keymint_use_latest_hal_aidl_rust",
     rustlibs: [
-        "android.hardware.security.keymint-V2-rust",
+        "android.hardware.security.keymint-V1-rust",
     ],
 }
diff --git a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/EcCurve.aidl b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/EcCurve.aidl
index ffc7efe..6b4a9ae 100644
--- a/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/EcCurve.aidl
+++ b/security/keymint/aidl/aidl_api/android.hardware.security.keymint/current/android/hardware/security/keymint/EcCurve.aidl
@@ -39,5 +39,4 @@
   P_256 = 1,
   P_384 = 2,
   P_521 = 3,
-  CURVE_25519 = 4,
 }
diff --git a/security/keymint/aidl/android/hardware/security/keymint/EcCurve.aidl b/security/keymint/aidl/android/hardware/security/keymint/EcCurve.aidl
index e9f81d8..5b1c10c 100644
--- a/security/keymint/aidl/android/hardware/security/keymint/EcCurve.aidl
+++ b/security/keymint/aidl/android/hardware/security/keymint/EcCurve.aidl
@@ -27,5 +27,4 @@
     P_256 = 1,
     P_384 = 2,
     P_521 = 3,
-    CURVE_25519 = 4,
 }
diff --git a/security/keymint/aidl/android/hardware/security/keymint/IKeyMintDevice.aidl b/security/keymint/aidl/android/hardware/security/keymint/IKeyMintDevice.aidl
index 9846ee9..cd8cfc5 100644
--- a/security/keymint/aidl/android/hardware/security/keymint/IKeyMintDevice.aidl
+++ b/security/keymint/aidl/android/hardware/security/keymint/IKeyMintDevice.aidl
@@ -93,11 +93,6 @@
  *        P-521.  STRONGBOX IKeyMintDevices must support NIST curve P-256.
  *      - TRUSTED_ENVIRONMENT IKeyMintDevices must support SHA1, SHA-2 224, SHA-2 256, SHA-2
  *        384 and SHA-2 512 digest modes.  STRONGBOX IKeyMintDevices must support SHA-2 256.
- *      - TRUSTED_ENVRIONMENT IKeyMintDevices must support curve 25519 for Purpose::SIGN (Ed25519,
- *        as specified in RFC 8032), Purpose::ATTEST_KEY (Ed25519) or for KeyPurpose::AGREE_KEY
- *        (X25519, as specified in RFC 7748).  However, a key must have exactly one of these
- *        purpose values; the same key cannot be used for multiple purposes.
- *        STRONGBOX IKeyMintDevices do not support curve 25519.
  *
  * o   AES
  *
@@ -292,7 +287,7 @@
      *   except AGREE_KEY must be supported for RSA keys.
      *
      * o Tag::DIGEST specifies digest algorithms that may be used with the new key.  TEE
-     *   IKeyMintDevice implementations must support all Digest values (see Digest.aidl) for RSA
+     *   IKeyMintDevice implementations must support all Digest values (see digest.aidl) for RSA
      *   keys.  StrongBox IKeyMintDevice implementations must support SHA_2_256.
      *
      * o Tag::PADDING specifies the padding modes that may be used with the new
@@ -303,24 +298,13 @@
      * == ECDSA Keys ==
      *
      * Tag::EC_CURVE must be provided to generate an ECDSA key.  If it is not provided, generateKey
-     * must return ErrorCode::UNSUPPORTED_KEY_SIZE or ErrorCode::UNSUPPORTED_EC_CURVE. TEE
-     * IKeyMintDevice implementations must support all required curves.  StrongBox implementations
-     * must support P_256 and no other curves.
-     *
+     * must return ErrorCode::UNSUPPORTED_KEY_SIZE. TEE IKeyMintDevice implementations must support
+     * all curves.  StrongBox implementations must support P_256.
+
      * Tag::CERTIFICATE_NOT_BEFORE and Tag::CERTIFICATE_NOT_AFTER must be provided to specify the
      * valid date range for the returned X.509 certificate holding the public key. If omitted,
      * generateKey must return ErrorCode::MISSING_NOT_BEFORE or ErrorCode::MISSING_NOT_AFTER.
      *
-     * Keys with EC_CURVE of EcCurve::CURVE_25519 must have exactly one purpose in the set
-     * {KeyPurpose::SIGN, KeyPurpose::ATTEST_KEY, KeyPurpose::AGREE_KEY}.  Key generation with more
-     * than one purpose should be rejected with ErrorCode::INCOMPATIBLE_PURPOSE.
-     * StrongBox implementation do not support CURVE_25519.
-     *
-     * Tag::DIGEST specifies digest algorithms that may be used with the new key.  TEE
-     * IKeyMintDevice implementations must support all Digest values (see Digest.aidl) for ECDSA
-     * keys; Ed25519 keys only support Digest::NONE. StrongBox IKeyMintDevice implementations must
-     * support SHA_2_256.
-     *
      * == AES Keys ==
      *
      * Only Tag::KEY_SIZE is required to generate an AES key.  If omitted, generateKey must return
diff --git a/security/keymint/aidl/android/hardware/security/keymint/KeyFormat.aidl b/security/keymint/aidl/android/hardware/security/keymint/KeyFormat.aidl
index 3faef38..da3d521 100644
--- a/security/keymint/aidl/android/hardware/security/keymint/KeyFormat.aidl
+++ b/security/keymint/aidl/android/hardware/security/keymint/KeyFormat.aidl
@@ -25,10 +25,8 @@
 enum KeyFormat {
     /** X.509 certificate format, for public key export. */
     X509 = 0,
-    /** PKCS#8 format, asymmetric key pair import. */
+    /** PCKS#8 format, asymmetric key pair import. */
     PKCS8 = 1,
-    /**
-     * Raw bytes, for symmetric key import, and for import of raw asymmetric keys for curve 25519.
-     */
+    /** Raw bytes, for symmetric key import. */
     RAW = 3,
 }
diff --git a/security/keymint/aidl/vts/functional/KeyMintTest.cpp b/security/keymint/aidl/vts/functional/KeyMintTest.cpp
index fb9afe4..2a7911c 100644
--- a/security/keymint/aidl/vts/functional/KeyMintTest.cpp
+++ b/security/keymint/aidl/vts/functional/KeyMintTest.cpp
@@ -6566,7 +6566,7 @@
 
 typedef KeyMintAidlTestBase KeyAgreementTest;
 
-static int EcdhCurveToOpenSslCurveName(EcCurve curve) {
+int CurveToOpenSslCurveName(EcCurve curve) {
     switch (curve) {
         case EcCurve::P_224:
             return NID_secp224r1;
@@ -6576,8 +6576,6 @@
             return NID_secp384r1;
         case EcCurve::P_521:
             return NID_secp521r1;
-        case EcCurve::CURVE_25519:
-            return NID_X25519;
     }
 }
 
@@ -6599,7 +6597,7 @@
         for (auto localCurve : ValidCurves()) {
             // Generate EC key locally (with access to private key material)
             auto ecKey = EC_KEY_Ptr(EC_KEY_new());
-            int curveName = EcdhCurveToOpenSslCurveName(localCurve);
+            int curveName = CurveToOpenSslCurveName(localCurve);
             auto group = EC_GROUP_Ptr(EC_GROUP_new_by_curve_name(curveName));
             ASSERT_NE(group, nullptr);
             ASSERT_EQ(EC_KEY_set_group(ecKey.get(), group.get()), 1);