diff --git a/tests/data_files/authorityKeyId_subjectKeyId.crt b/tests/data_files/authorityKeyId_subjectKeyId.crt
new file mode 100644
index 0000000..c2c9a63
--- /dev/null
+++ b/tests/data_files/authorityKeyId_subjectKeyId.crt
@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
\ No newline at end of file
diff --git a/tests/data_files/authorityKeyId_subjectKeyId_wrong_AuthorityKeyId_KeyId.crt b/tests/data_files/authorityKeyId_subjectKeyId_wrong_AuthorityKeyId_KeyId.crt
new file mode 100644
index 0000000..bc28741
--- /dev/null
+++ b/tests/data_files/authorityKeyId_subjectKeyId_wrong_AuthorityKeyId_KeyId.crt
@@ -0,0 +1,3 @@
+-----BEGIN CERTIFICATE-----
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
+-----END CERTIFICATE-----
\ No newline at end of file
diff --git a/tests/data_files/authorityKeyId_subjectKeyId_wrong_AuthorityKeyId_Sequence.crt b/tests/data_files/authorityKeyId_subjectKeyId_wrong_AuthorityKeyId_Sequence.crt
new file mode 100644
index 0000000..6a7d7f7
--- /dev/null
+++ b/tests/data_files/authorityKeyId_subjectKeyId_wrong_AuthorityKeyId_Sequence.crt
@@ -0,0 +1,3 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
\ No newline at end of file
diff --git a/tests/data_files/authorityKeyId_subjectKeyId_wrong_Issuer1.crt b/tests/data_files/authorityKeyId_subjectKeyId_wrong_Issuer1.crt
new file mode 100644
index 0000000..045c570
--- /dev/null
+++ b/tests/data_files/authorityKeyId_subjectKeyId_wrong_Issuer1.crt
@@ -0,0 +1,3 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
\ No newline at end of file
diff --git a/tests/data_files/authorityKeyId_subjectKeyId_wrong_Issuer2.crt b/tests/data_files/authorityKeyId_subjectKeyId_wrong_Issuer2.crt
new file mode 100644
index 0000000..a103729
--- /dev/null
+++ b/tests/data_files/authorityKeyId_subjectKeyId_wrong_Issuer2.crt
@@ -0,0 +1,3 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
\ No newline at end of file
diff --git a/tests/data_files/authorityKeyId_subjectKeyId_wrong_Issuer3.crt b/tests/data_files/authorityKeyId_subjectKeyId_wrong_Issuer3.crt
new file mode 100644
index 0000000..dabad62
--- /dev/null
+++ b/tests/data_files/authorityKeyId_subjectKeyId_wrong_Issuer3.crt
@@ -0,0 +1,3 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
\ No newline at end of file
diff --git a/tests/data_files/authorityKeyId_subjectKeyId_wrong_Issuer4.crt b/tests/data_files/authorityKeyId_subjectKeyId_wrong_Issuer4.crt
new file mode 100644
index 0000000..55e6579
--- /dev/null
+++ b/tests/data_files/authorityKeyId_subjectKeyId_wrong_Issuer4.crt
@@ -0,0 +1,3 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
\ No newline at end of file
diff --git a/tests/data_files/authorityKeyId_subjectKeyId_wrong_SubjectKeyId.crt b/tests/data_files/authorityKeyId_subjectKeyId_wrong_SubjectKeyId.crt
new file mode 100644
index 0000000..4c99a2f
--- /dev/null
+++ b/tests/data_files/authorityKeyId_subjectKeyId_wrong_SubjectKeyId.crt
@@ -0,0 +1,3 @@
+-----BEGIN CERTIFICATE-----
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
+-----END CERTIFICATE-----
\ No newline at end of file
diff --git a/tests/suites/test_suite_x509parse.data b/tests/suites/test_suite_x509parse.data
index 685b859..54bad3c 100644
--- a/tests/suites/test_suite_x509parse.data
+++ b/tests/suites/test_suite_x509parse.data
@@ -3165,3 +3165,39 @@
 X509 ext types accessor: ext type not present
 depends_on:MBEDTLS_X509_CRT_PARSE_C
 x509_accessor_ext_types:MBEDTLS_X509_EXT_KEY_USAGE:MBEDTLS_X509_EXT_SUBJECT_ALT_NAME
+
+X509 CRT parse Subject Key Id - Correct
+depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_CERTS_C:MBEDTLS_SHA1_C:MBEDTLS_RSA_C
+mbedtls_x509_crt_parse_subjectkeyid:"data_files/authorityKeyId_subjectKeyId.crt":"B45AE4A5B3DED252F6B9D5A6950FEB3EBCC7FDFF":20:0
+
+X509 CRT parse Subject Key Id - Wrong
+depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_CERTS_C:MBEDTLS_SHA1_C:MBEDTLS_RSA_C
+mbedtls_x509_crt_parse_subjectkeyid:"data_files/authorityKeyId_subjectKeyId_wrong_SubjectKeyId.crt":"":0:0xff9e
+
+X509 CRT parse Authority Key Id - Correct
+depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_CERTS_C:MBEDTLS_SHA1_C:MBEDTLS_RSA_C
+mbedtls_x509_crt_parse_authoritykeyid:"data_files/authorityKeyId_subjectKeyId.crt":"B45AE4A5B3DED252F6B9D5A6950FEB3EBCC7FDFF":20:"NL/PolarSSL/PolarSSL Test CA/":"0":1:0
+
+X509 CRT parse Authority Key Id - Wrong Sequence
+depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_CERTS_C:MBEDTLS_SHA1_C:MBEDTLS_RSA_C
+mbedtls_x509_crt_parse_authoritykeyid:"data_files/authorityKeyId_subjectKeyId_wrong_AuthorityKeyId_Sequence.crt":"":0:"":"0":0:0xff9e
+
+X509 CRT parse Authority Key Id - Wrong KeyId Tag
+depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_CERTS_C:MBEDTLS_SHA1_C:MBEDTLS_RSA_C
+mbedtls_x509_crt_parse_authoritykeyid:"data_files/authorityKeyId_subjectKeyId_wrong_AuthorityKeyId_KeyId.crt":"":0:"":"0":0:0xff9e
+
+X509 CRT parse Authority Key Id - Wrong Issuer Tag 1
+depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_CERTS_C:MBEDTLS_SHA1_C:MBEDTLS_RSA_C
+mbedtls_x509_crt_parse_authoritykeyid:"data_files/authorityKeyId_subjectKeyId_wrong_Issuer1.crt":"":0:"":"0":0:0xff9e
+
+X509 CRT parse Authority Key Id - Wrong Issuer Tag 2
+depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_CERTS_C:MBEDTLS_SHA1_C:MBEDTLS_RSA_C
+mbedtls_x509_crt_parse_authoritykeyid:"data_files/authorityKeyId_subjectKeyId_wrong_Issuer2.crt":"":0:"":"0":0:0xff9e
+
+X509 CRT parse Authority Key Id - Wrong Issuer Tag 3
+depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_CERTS_C:MBEDTLS_SHA1_C:MBEDTLS_RSA_C
+mbedtls_x509_crt_parse_authoritykeyid:"data_files/authorityKeyId_subjectKeyId_wrong_Issuer3.crt":"":0:"":"0":0:0xff9e
+
+X509 CRT parse Authority Key Id - Wrong Issuer Tag 4
+depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_CERTS_C:MBEDTLS_SHA1_C:MBEDTLS_RSA_C
+mbedtls_x509_crt_parse_authoritykeyid:"data_files/authorityKeyId_subjectKeyId_wrong_Issuer4.crt":"":0:"":"0":0:0xdc1e
diff --git a/tests/suites/test_suite_x509parse.function b/tests/suites/test_suite_x509parse.function
index 177bc97..12b7818 100644
--- a/tests/suites/test_suite_x509parse.function
+++ b/tests/suites/test_suite_x509parse.function
@@ -1472,3 +1472,95 @@
     ;;
 }
 /* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_CERTS_C:MBEDTLS_SHA1_C:MBEDTLS_RSA_C */
+void mbedtls_x509_crt_parse_subjectkeyid(char *crt_path,
+                                         char *subjectKeyId,
+                                         int subjectKeyIdLength,
+                                         int retVal)
+{
+    mbedtls_x509_crt crt;
+    int i = 0;
+    int result = 0;
+
+    mbedtls_x509_crt_init(&crt);
+
+    TEST_ASSERT((mbedtls_x509_crt_parse_file(&crt, crt_path)& 0xFFFF) == retVal);
+
+    if (retVal != 0) {
+        while (i < subjectKeyIdLength) {
+            result |= crt.subject_key_id.p[i] != subjectKeyId[i*2];
+            result |= crt.subject_key_id.p[i+1] != subjectKeyId[i*2+1];
+            i++;
+        }
+
+        TEST_ASSERT(result == 0);
+    }
+
+exit:
+    mbedtls_x509_crt_free(&crt);
+}
+/* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_CERTS_C:MBEDTLS_SHA1_C:MBEDTLS_RSA_C */
+void mbedtls_x509_crt_parse_authoritykeyid(char *crt_path,
+                                           char *authorityKeyId_keyId,
+                                           int keyIdLength,
+                                           char *authorityKeyId_issuer,
+                                           char *authorityKeyId_serial,
+                                           int serialLength,
+                                           int retVal)
+{
+    mbedtls_x509_crt crt;
+    int i = 0;
+    int result = 0;
+    int bufferCounter = 0;
+    size_t issuerCounter = 0;
+
+    mbedtls_x509_crt_init(&crt);
+
+    TEST_ASSERT((mbedtls_x509_crt_parse_file(&crt, crt_path)& 0xFFFF) == retVal);
+
+    if (retVal != 0) {
+        /* KeyId test */
+        while (i < keyIdLength) {
+            result |= crt.authority_key_id.keyIdentifier.p[i] != authorityKeyId_keyId[i*2];
+            result |= crt.authority_key_id.keyIdentifier.p[i+1] != authorityKeyId_keyId[i*2+1];
+            i++;
+        }
+
+        /* Issuer test */
+        mbedtls_x509_name *issuerPtr = &crt.authority_key_id.authorityCertIssuer;
+        while (issuerPtr != NULL) {
+            for (issuerCounter = 0u; issuerCounter < issuerPtr->val.len; issuerCounter++) {
+                result |=
+                    (authorityKeyId_issuer[bufferCounter++] != issuerPtr->val.p[issuerCounter]);
+            }
+            bufferCounter++; /* Skipping the slash */
+            issuerPtr = issuerPtr->next;
+        }
+
+        /* Serial test */
+        i = 0;
+        while (i < serialLength) {
+            result |= crt.authority_key_id.authorityCertSerialNumber.p[i] !=
+                      authorityKeyId_serial[i*2];
+            result |= crt.authority_key_id.authorityCertSerialNumber.p[i+1] !=
+                      authorityKeyId_serial[i*2+1];
+            i++;
+        }
+
+        TEST_ASSERT(result == 0);
+    }
+
+exit:
+    mbedtls_x509_crt_free(&crt);
+}
+/* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_SELF_TEST */
+void x509_selftest()
+{
+    TEST_ASSERT(mbedtls_x509_self_test(1) == 0);
+}
+/* END_CASE */