mincrypt: support SHA-256 hash algorithm

- adds a library to compute the SHA-256 hash

- updates the RSA verifier to take an argument specifying either SHA-1
  or SHA-256

- updates DumpPublicKey to with new "key" version numbers for
  specifying SHA-256

- adds new argument to adb auth code to maintain existing behavior

Change-Id: I5b1406cf57c2b8993f6032eda3e29139f7740839
diff --git a/include/mincrypt/rsa.h b/include/mincrypt/rsa.h
index d7429fc..cc0e800 100644
--- a/include/mincrypt/rsa.h
+++ b/include/mincrypt/rsa.h
@@ -48,7 +48,8 @@
 int RSA_verify(const RSAPublicKey *key,
                const uint8_t* signature,
                const int len,
-               const uint8_t* sha);
+               const uint8_t* hash,
+               const int hash_len);
 
 #ifdef __cplusplus
 }