boot: Fix ASN.1 for mbedtls >= 3.1

In Mbed TLS 3.1, the private fields in the ASN.1 structure were made private. This breaks code that accesses these private macros. Fix this by changing the ASN.1 specific code to use a new field accessor `ASN1_CONTEXT_MEMBER` that will be conditionally defined based on the version of Mbed TLS that is present. Signed-off-by: David Brown <david.brown@linaro.org>
mcu-tools · Jun 27, 2024 · a28a932 · a28a932
1 parent a706317
commit a28a932
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Showing 4 changed files with 25 additions and 16 deletions.
diff --git 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
@@ -102,13 +102,13 @@ static int bootutil_import_key(uint8_t **cp, uint8_t *end)
  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 @@ static int bootutil_parse_eckey(bootutil_ecdsa_context *ctx, uint8_t **p, uint8_
  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
@@ -126,12 +126,12 @@ parse_ec256_enckey(uint8_t **p, uint8_t *end, uint8_t *private_key)
  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 @@ parse_x25519_enckey(uint8_t **p, uint8_t *end, uint8_t *private_key)
  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
@@ -45,8 +45,8 @@ bootutil_import_key(uint8_t **cp, uint8_t *end)
  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;
  }