Expose some SHA1Digest methods for FIPS 186-2 PRF

The FIPS 186-2 PRF required by EAP-SIM and EAP-AKA (used in telephony)
require a hashing function extremely similar to SHA1, with the exception
of the padding bytes added. This commit exposes the BouncyCastle
SHA1Digest implementation as core-platform-api to allow platform
internals to implement FIPS 186-2 PRF without re-implementing SHA1.

Bug: 136175302
Test: Build succeeds, IKE using this, tests passing.
Change-Id: I2d61e2c331f3f80c8a1ebcb85209f9a49968ade5

1 files changed, 5 insertions, 1 deletions

diff --git a/repackaged/bcprov/src/main/java/com/android/org/bouncycastle/crypto/digests/GeneralDigest.java b/repackaged/bcprov/src/main/java/com/android/org/bouncycastle/crypto/digests/GeneralDigest.java
index c075dce5..80714665 100644
--- a/repackaged/bcprov/src/main/java/com/android/org/bouncycastle/crypto/digests/GeneralDigest.java
+++ b/repackaged/bcprov/src/main/java/com/android/org/bouncycastle/crypto/digests/GeneralDigest.java
@@ -10,6 +10,7 @@ import com.android.org.bouncycastle.util.Pack;
  * "Handbook of Applied Cryptography", pages 344 - 347.
  * @hide This class is not part of the Android public SDK API
  */
+@libcore.api.CorePlatformApi
 public abstract class GeneralDigest
     implements ExtendedDigest, Memoable
 {
@@ -67,6 +68,7 @@ public abstract class GeneralDigest
         byteCount++;
     }
 
+    @libcore.api.CorePlatformApi
     public void update(
         byte[]  in,
         int     inOff,
@@ -112,6 +114,7 @@ public abstract class GeneralDigest
         byteCount += len;
     }
 
+    @libcore.api.CorePlatformApi
     public void finish()
     {
         long    bitLength = (byteCount << 3);
@@ -153,10 +156,11 @@ public abstract class GeneralDigest
     {
         return BYTE_LENGTH;
     }
-    
+
     protected abstract void processWord(byte[] in, int inOff);
 
     protected abstract void processLength(long bitLength);
 
+    @libcore.api.CorePlatformApi
     protected abstract void processBlock();
 }