Use accessors instead of reaching into the RSA struct am: eedfb29cdb am: 676444f63d

Original change: https://android-review.googlesource.com/c/platform/external/vboot_reference/+/2569310

Change-Id: I6d84d25db34b32f8fe4d1e1c6eb8b13ffd2caff6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/host/lib/util_misc.c b/host/lib/util_misc.c
index e75251e..ac0b3ea 100644
--- a/host/lib/util_misc.c
+++ b/host/lib/util_misc.c
@@ -29,7 +29,7 @@
 	free(digest);
 }
 
-int vb_keyb_from_rsa(struct rsa_st *rsa_private_key,
+int vb_keyb_from_rsa(RSA *rsa_private_key,
 		     uint8_t **keyb_data, uint32_t *keyb_size)
 {
 	uint32_t i, nwords;
@@ -46,7 +46,7 @@
 	int retval = 1;
 
 	/* Size of RSA key in 32-bit words */
-	nwords = BN_num_bits(rsa_private_key->n) / 32;
+	nwords = RSA_bits(rsa_private_key) / 32;
 
 	bufsize = (2 + nwords + nwords) * sizeof(uint32_t);
 	outbuf = malloc(bufsize);
@@ -75,7 +75,7 @@
 	NEW_BIGNUM(B);
 #undef NEW_BIGNUM
 
-	BN_copy(N, rsa_private_key->n);
+	BN_copy(N, RSA_get0_n(rsa_private_key));
 	BN_set_word(Big1, 1L);
 	BN_set_word(Big2, 2L);
 	BN_set_word(Big32, 32L);