diff --git a/boot/bootutil/include/bootutil/crypto/common.h b/boot/bootutil/include/bootutil/crypto/common.h
index c765fe1..1fb5c58 100644
--- a/boot/bootutil/include/bootutil/crypto/common.h
+++ b/boot/bootutil/include/bootutil/crypto/common.h
@@ -17,4 +17,13 @@
 #define MBEDTLS_CONTEXT_MEMBER(X) X
 #endif
 
+/* Newer versions of Mbed TLS have removed the private accessor requirement for
+ * the ASN1 fields.
+ */
+#if (MBEDTLS_VERSION_NUMBER >= 0x03000000) && (MBEDTLS_VERSION_NUMBER < 0x03010000)
+#define ASN1_CONTEXT_MEMBER(X) MBEDTLS_PRIVATE(X)
+#else
+#define ASN1_CONTEXT_MEMBER(X) X
+#endif
+
 #endif /* __BOOTUTIL_CRYPTO_COMMON_H__ */
diff --git a/boot/bootutil/include/bootutil/crypto/ecdsa.h b/boot/bootutil/include/bootutil/crypto/ecdsa.h
index 5a87f73..3b05410 100644
--- a/boot/bootutil/include/bootutil/crypto/ecdsa.h
+++ b/boot/bootutil/include/bootutil/crypto/ecdsa.h
@@ -102,13 +102,13 @@
         return -2;
     }
     /* id-ecPublicKey (RFC5480) */
-    if (alg.MBEDTLS_CONTEXT_MEMBER(len) != sizeof(ec_pubkey_oid) - 1 ||
-        memcmp(alg.MBEDTLS_CONTEXT_MEMBER(p), ec_pubkey_oid, sizeof(ec_pubkey_oid) - 1)) {
+    if (alg.ASN1_CONTEXT_MEMBER(len) != sizeof(ec_pubkey_oid) - 1 ||
+        memcmp(alg.ASN1_CONTEXT_MEMBER(p), ec_pubkey_oid, sizeof(ec_pubkey_oid) - 1)) {
         return -3;
     }
     /* namedCurve (RFC5480) */
-    if (param.MBEDTLS_CONTEXT_MEMBER(len) != sizeof(ec_secp256r1_oid) - 1 ||
-        memcmp(param.MBEDTLS_CONTEXT_MEMBER(p), ec_secp256r1_oid, sizeof(ec_secp256r1_oid) - 1)) {
+    if (param.ASN1_CONTEXT_MEMBER(len) != sizeof(ec_secp256r1_oid) - 1 ||
+        memcmp(param.ASN1_CONTEXT_MEMBER(p), ec_secp256r1_oid, sizeof(ec_secp256r1_oid) - 1)) {
         return -4;
     }
     /* ECPoint (RFC5480) */
@@ -512,12 +512,12 @@
     if (mbedtls_asn1_get_alg(p, end, &alg, &param)) {
         return -2;
     }
-    if (alg.MBEDTLS_CONTEXT_MEMBER(len) != sizeof(ec_pubkey_oid) - 1 ||
-      memcmp(alg.MBEDTLS_CONTEXT_MEMBER(p), ec_pubkey_oid, sizeof(ec_pubkey_oid) - 1)) {
+    if (alg.ASN1_CONTEXT_MEMBER(len) != sizeof(ec_pubkey_oid) - 1 ||
+      memcmp(alg.ASN1_CONTEXT_MEMBER(p), ec_pubkey_oid, sizeof(ec_pubkey_oid) - 1)) {
         return -3;
     }
-    if (param.MBEDTLS_CONTEXT_MEMBER(len) != sizeof(ec_secp256r1_oid) - 1||
-      memcmp(param.MBEDTLS_CONTEXT_MEMBER(p), ec_secp256r1_oid, sizeof(ec_secp256r1_oid) - 1)) {
+    if (param.ASN1_CONTEXT_MEMBER(len) != sizeof(ec_secp256r1_oid) - 1||
+      memcmp(param.ASN1_CONTEXT_MEMBER(p), ec_secp256r1_oid, sizeof(ec_secp256r1_oid) - 1)) {
         return -4;
     }
 
diff --git a/boot/bootutil/src/encrypted.c b/boot/bootutil/src/encrypted.c
index 4082611..fee30dd 100644
--- a/boot/bootutil/src/encrypted.c
+++ b/boot/bootutil/src/encrypted.c
@@ -126,12 +126,12 @@
         return -5;
     }
 
-    if (alg.MBEDTLS_CONTEXT_MEMBER(len) != sizeof(ec_pubkey_oid) - 1 ||
-        memcmp(alg.MBEDTLS_CONTEXT_MEMBER(p), ec_pubkey_oid, sizeof(ec_pubkey_oid) - 1)) {
+    if (alg.ASN1_CONTEXT_MEMBER(len) != sizeof(ec_pubkey_oid) - 1 ||
+        memcmp(alg.ASN1_CONTEXT_MEMBER(p), ec_pubkey_oid, sizeof(ec_pubkey_oid) - 1)) {
         return -6;
     }
-    if (param.MBEDTLS_CONTEXT_MEMBER(len) != sizeof(ec_secp256r1_oid) - 1 ||
-        memcmp(param.MBEDTLS_CONTEXT_MEMBER(p), ec_secp256r1_oid, sizeof(ec_secp256r1_oid) - 1)) {
+    if (param.ASN1_CONTEXT_MEMBER(len) != sizeof(ec_secp256r1_oid) - 1 ||
+        memcmp(param.ASN1_CONTEXT_MEMBER(p), ec_secp256r1_oid, sizeof(ec_secp256r1_oid) - 1)) {
         return -7;
     }
 
@@ -203,8 +203,8 @@
         return -4;
     }
 
-    if (alg.MBEDTLS_CONTEXT_MEMBER(len) != sizeof(ec_pubkey_oid) - 1 ||
-        memcmp(alg.MBEDTLS_CONTEXT_MEMBER(p), ec_pubkey_oid, sizeof(ec_pubkey_oid) - 1)) {
+    if (alg.ASN1_CONTEXT_MEMBER(len) != sizeof(ec_pubkey_oid) - 1 ||
+        memcmp(alg.ASN1_CONTEXT_MEMBER(p), ec_pubkey_oid, sizeof(ec_pubkey_oid) - 1)) {
         return -5;
     }
 
diff --git a/boot/bootutil/src/image_ed25519.c b/boot/bootutil/src/image_ed25519.c
index c51fea4..7a597d4 100644
--- a/boot/bootutil/src/image_ed25519.c
+++ b/boot/bootutil/src/image_ed25519.c
@@ -45,8 +45,8 @@
         return -2;
     }
 
-    if (alg.MBEDTLS_CONTEXT_MEMBER(len) != sizeof(ed25519_pubkey_oid) - 1 ||
-        memcmp(alg.MBEDTLS_CONTEXT_MEMBER(p), ed25519_pubkey_oid, sizeof(ed25519_pubkey_oid) - 1)) {
+    if (alg.ASN1_CONTEXT_MEMBER(len) != sizeof(ed25519_pubkey_oid) - 1 ||
+        memcmp(alg.ASN1_CONTEXT_MEMBER(p), ed25519_pubkey_oid, sizeof(ed25519_pubkey_oid) - 1)) {
         return -3;
     }