Remove EcIesParameterSpec until it's needed.

This class was added in Android M to enable us to expose ECIES. ECIES
is not going to happen in Android M. I'm thus removing this unused
class until such time when it's needed.

Bug: 18088752
Change-Id: I16ab1bbd0b4334419c9a8f29d64661c150aa8d32

1 files changed, 0 insertions, 272 deletions

diff --git a/keystore/java/android/security/EcIesParameterSpec.java b/keystore/java/android/security/EcIesParameterSpec.java
deleted file mode 100644
index 1cd8784..0000000
--- a/keystore/java/android/security/EcIesParameterSpec.java
+++ /dev/null
@@ -1,272 +0,0 @@
-package android.security;
-
-import android.annotation.IntDef;
-import android.annotation.NonNull;
-import android.annotation.Nullable;
-
-import java.lang.annotation.Retention;
-import java.lang.annotation.RetentionPolicy;
-import java.security.spec.AlgorithmParameterSpec;
-
-import javax.crypto.Cipher;
-import javax.crypto.Mac;
-
-/**
- * {@link AlgorithmParameterSpec} for ECIES (Integrated Encryption Scheme using Elliptic Curve
- * cryptography) based on {@code ISO/IEC 18033-2}.
- *
- * <p>ECIES is a hybrid authenticated encryption scheme. Encryption is performed using an Elliptic
- * Curve (EC) public key. The resulting ciphertext can be decrypted only using the corresponding EC
- * private key. The scheme is called hybrid because the EC key is only used to securely encapsulate
- * symmetric key material. Encryption of plaintext and authentication of the corresponding
- * ciphertext is performed using symmetric cryptography.
- *
- * <p>Encryption using ECIES consists of two stages:
- * <ol>
- * <li>Key Encapsulation Mechanism (KEM) randomly generates symmetric key material and securely
- * encapsulates it in the output so that it can be extracted by the KEM when decrypting.
- * Encapsulated key material is represented in the output as an EC point.</li>
- * <li>The above symmetric key material is used by Data Encapsulation Mechanism (DEM) to encrypt the
- * provided plaintext and authenticate the ciphertext. The resulting authenticated ciphertext is
- * then output. When decrypting, the DEM first authenticates the ciphertext and, only if it
- * authenticates, decrypts the ciphertext and outputs the plaintext.</li>
- * </ol>
- *
- * <p>Details of KEM:
- * <ul>
- * <li>Only curves with cofactor of {@code 1} are supported.</li>
- * <li>{@code CheckMode}, {@code OldCofactorMode}, {@code CofactorMode}, and {@code SingleHashMode}
- * are {@code 0}.
- * <li>Point format is specified by {@link #getKemPointFormat()}.</li>
- * <li>KDF algorithm is specified by {@link #getKemKdfAlgorithm()}.</li>
- * </ul>
- *
- * <p>Details of DEM:
- * <ul>
- * <li>Only DEM1-like mechanism is supported, with its symmetric cipher (SC) specified by
- * {@link #getDemCipherTransformation()} (e.g., {@code AES/CBC/NoPadding} for standard DEM1) and
- * MAC algorithm specified by {@link #getDemMacAlgorithm()} (e.g., {@code HmacSHA1} for standard
- * DEM1).</li>
- * </ul>
- */
-public class EcIesParameterSpec implements AlgorithmParameterSpec {
-
-    /**
-     * @hide
-     */
-    @Retention(RetentionPolicy.SOURCE)
-    @IntDef({
-        POINT_FORMAT_UNSPECIFIED,
-        POINT_FORMAT_UNCOMPRESSED,
-        POINT_FORMAT_COMPRESSED,
-        })
-    public @interface PointFormatEnum {}
-
-    /** Unspecified EC point format. */
-    public static final int POINT_FORMAT_UNSPECIFIED = -1;
-
-    /**
-     * Uncompressed EC point format: both coordinates are stored separately.
-     *
-     * <p>The wire format is byte {@code 0x04} followed by binary representation of the {@code x}
-     * coordinate followed by binary representation of the {@code y} coordinate. See
-     * {@code ISO 18033-2} section {@code 5.4.3}.
-     */
-    public static final int POINT_FORMAT_UNCOMPRESSED = 0;
-
-    /**
-     * Compressed EC point format: only one coordinate is stored.
-     *
-     * <p>The wire format is byte {@code 0x02} or {@code 0x03} (depending on the value of the stored
-     * coordinate) followed by the binary representation of the {@code x} coordinate. See
-     * {@code ISO 18033-2} section {@code 5.4.3}.
-     */
-    public static final int POINT_FORMAT_COMPRESSED = 1;
-
-    /**
-     * Default parameter spec: compressed point format, {@code HKDFwithSHA256}, DEM uses 128-bit AES
-     * GCM.
-     */
-    public static final EcIesParameterSpec DEFAULT = new EcIesParameterSpec(
-            POINT_FORMAT_COMPRESSED,
-            "HKDFwithSHA256",
-            "AES/GCM/NoPadding",
-            128,
-            null,
-            0);
-
-    private final @PointFormatEnum int mKemPointFormat;
-    private final String mKemKdfAlgorithm;
-    private final String mDemCipherTransformation;
-    private final int mDemCipherKeySize;
-    private final String mDemMacAlgorithm;
-    private final int mDemMacKeySize;
-
-    private EcIesParameterSpec(
-            @PointFormatEnum int kemPointFormat,
-            String kemKdfAlgorithm,
-            String demCipherTransformation,
-            int demCipherKeySize,
-            String demMacAlgorithm,
-            int demMacKeySize) {
-        mKemPointFormat = kemPointFormat;
-        mKemKdfAlgorithm = kemKdfAlgorithm;
-        mDemCipherTransformation = demCipherTransformation;
-        mDemCipherKeySize = demCipherKeySize;
-        mDemMacAlgorithm = demMacAlgorithm;
-        mDemMacKeySize = demMacKeySize;
-    }
-
-    /**
-     * Returns KEM EC point wire format or {@link #POINT_FORMAT_UNSPECIFIED} if not specified.
-     */
-    public @PointFormatEnum int getKemPointFormat() {
-        return mKemPointFormat;
-    }
-
-    /**
-     * Returns KEM KDF algorithm (e.g., {@code HKDFwithSHA256} or {@code KDF1withSHA1}) or
-     * {@code null} if not specified.
-     */
-    @Nullable
-    public String getKemKdfAlgorithm() {
-        return mKemKdfAlgorithm;
-    }
-
-    /**
-     * Returns DEM {@link Cipher} transformation (e.g., {@code AES/GCM/NoPadding} or
-     * {@code AES/CBC/PKCS7Padding}) or {@code null} if not specified.
-     *
-     * @see Cipher#getInstance(String)
-     * @see #getDemCipherKeySize()
-     */
-    @Nullable
-    public String getDemCipherTransformation() {
-        return mDemCipherTransformation;
-    }
-
-    /**
-     * Returns DEM {@link Cipher} key size in bits.
-     *
-     * @see #getDemCipherTransformation()
-     */
-    public int getDemCipherKeySize() {
-        return mDemCipherKeySize;
-    }
-
-    /**
-     * Returns DEM {@link Mac} algorithm (e.g., {@code HmacSHA256} or {@code HmacSHA1}) or
-     * {@code null} if not specified.
-     *
-     * @see Mac#getInstance(String)
-     * @see #getDemMacKeySize()
-     */
-    @Nullable
-    public String getDemMacAlgorithm() {
-        return mDemMacAlgorithm;
-    }
-
-    /**
-     * Returns DEM {@link Mac} key size in bits.
-     *
-     * @see #getDemCipherTransformation()
-     */
-    public int getDemMacKeySize() {
-        return mDemMacKeySize;
-    }
-
-    /**
-     * Builder of {@link EcIesParameterSpec}.
-     */
-    public static class Builder {
-        private @PointFormatEnum int mKemPointFormat = POINT_FORMAT_UNSPECIFIED;
-        private String mKemKdfAlgorithm;
-        private String mDemCipherTransformation;
-        private int mDemCipherKeySize = 128;
-        private String mDemMacAlgorithm;
-        private int mDemMacKeySize = -1;
-
-        /**
-         * Sets KEM EC point wire format.
-         */
-        public Builder setKemPointFormat(@PointFormatEnum int pointFormat) {
-            mKemPointFormat = pointFormat;
-            return this;
-        }
-
-        /**
-         * Sets KEM KDF algorithm. For example, {@code HKDFwithSHA256}, {@code KDF2withSHA256}, or
-         * {@code KDF1withSHA1}.
-         */
-        @NonNull
-        public Builder setKemKdfAlgorithm(@Nullable String algorithm) {
-            mKemKdfAlgorithm = algorithm;
-            return this;
-        }
-
-        /**
-         * Sets DEM {@link Cipher} transformation. For example, {@code AES/GCM/NoPadding},
-         * {@code AES/CBC/PKCS7Padding} or {@code AES/CTR/NoPadding}.
-         *
-         * @see Cipher#getInstance(String)
-         */
-        @NonNull
-        public Builder setDemCipherTransformation(@Nullable String transformation) {
-            mDemCipherTransformation = transformation;
-            return this;
-        }
-
-        /**
-         * Returns DEM {@link Cipher} key size in bits.
-         *
-         * <p>The default value is {@code 128} bits.
-         *
-         * @see #setDemCipherTransformation(String)
-         */
-        @NonNull
-        public Builder setDemCipherKeySize(int sizeBits) {
-            mDemCipherKeySize = sizeBits;
-            return this;
-        }
-
-        /**
-         * Sets DEM {@link Mac} algorithm. For example, {@code HmacSHA256} or {@code HmacSHA1}.
-         *
-         * @see Mac#getInstance(String)
-         */
-        @NonNull
-        public Builder setDemMacAlgorithm(@Nullable String algorithm) {
-            mDemMacAlgorithm = algorithm;
-            return this;
-        }
-
-        /**
-         * Sets DEM {@link Mac} key size in bits.
-         *
-         * <p>By default, {@code Mac} key size is the same as the {@code Cipher} key size.
-         *
-         * @see #setDemCipherKeySize(int)
-         */
-        @NonNull
-        public Builder setDemMacKeySize(int sizeBits) {
-            mDemMacKeySize = sizeBits;
-            return this;
-        }
-
-        /**
-         * Returns a new {@link EcIesParameterSpec} based on the current state of this builder.
-         */
-        @NonNull
-        public EcIesParameterSpec build() {
-            int demMacKeySize = (mDemMacKeySize != -1) ? mDemMacKeySize : mDemCipherKeySize;
-            return new EcIesParameterSpec(
-                    mKemPointFormat,
-                    mKemKdfAlgorithm,
-                    mDemCipherTransformation,
-                    mDemCipherKeySize,
-                    mDemMacAlgorithm,
-                    demMacKeySize
-                    );
-        }
-    }
-}