add KeyGenerator for AndroidKeyStore

src/api-impl/android/security/keystore/KeyGenParameterSpec.java

@@ -0,0 +1,68 @@
+package android.security.keystore;
+
+public class KeyGenParameterSpec {
+
+	private String keystoreAlias;
+	private int purposes;
+	private int keySize;
+	private String[] blockModes;
+	private String[] encryptionPaddings;
+	private boolean userAuthenticationRequired;
+
+	public static class Builder {
+		private KeyGenParameterSpec spec = new KeyGenParameterSpec();
+
+		public Builder(String keystoreAlias, int purposes) {
+			spec.keystoreAlias = keystoreAlias;
+			spec.purposes = purposes;
+		}
+
+		public Builder setKeySize(int keySize) {
+			spec.keySize = keySize;
+			return this;
+		}
+
+		public Builder setBlockModes(String[] blockModes) {
+			spec.blockModes = blockModes;
+			return this;
+		}
+
+		public Builder setEncryptionPaddings(String[] encryptionPaddings) {
+			spec.encryptionPaddings = encryptionPaddings;
+			return this;
+		}
+
+		public Builder setUserAuthenticationRequired(boolean userAuthenticationRequired) {
+			spec.userAuthenticationRequired = userAuthenticationRequired;
+			return this;
+		}
+
+		public KeyGenParameterSpec build() {
+			return spec;
+		}
+	}
+
+	public int getKeySize() {
+		return keySize;
+	}
+
+	public String[] getBlockModes() {
+		return blockModes;
+	}
+
+	public int getPurposes() {
+		return purposes;
+	}
+
+	public String[] getEncryptionPaddings() {
+		return encryptionPaddings;
+	}
+
+	public boolean isUserAuthenticationRequired() {
+		return userAuthenticationRequired;
+	}
+
+	public String getKeystoreAlias() {
+		return keystoreAlias;
+	}
+}