diff --git a/internal/provider/tor_obfs4_bridge_line_data_source_test.go b/internal/provider/tor_obfs4_bridge_line_data_source_test.go
index d4032a2..3f30230 100644
--- a/internal/provider/tor_obfs4_bridge_line_data_source_test.go
+++ b/internal/provider/tor_obfs4_bridge_line_data_source_test.go
@@ -32,7 +32,7 @@ func TestTorObfs4BridgeLineDataSource(t *testing.T) {
 					resource.TestCheckResourceAttrSet("data.tor_obfs4_bridge_line.test", "bridge_line"),
 
 					resource.TestMatchResourceAttr("data.tor_obfs4_bridge_line.test", "bridge_line",
-						regexp.MustCompile(`^Bridge obfs4 192\.0\.2\.1:443 [0-9a-f]{40} cert=[A-Za-z0-9+/]+ iat-mode=[0-2]$`)),
+						regexp.MustCompile(`^Bridge obfs4 192\.0\.2\.1:443 [0-9A-F]{40} cert=[A-Za-z0-9+/]+ iat-mode=[0-2]$`)),
 
 					// Check that input values are used correctly
 					resource.TestCheckResourceAttrPair("data.tor_obfs4_bridge_line.test", "identity_fingerprint_sha1", "tor_relay_identity_rsa.test", "public_key_fingerprint_sha1"),
diff --git a/internal/provider/tor_relay_identity_ed25519_resource.go b/internal/provider/tor_relay_identity_ed25519_resource.go
index 4a3f29d..3a58a8f 100644
--- a/internal/provider/tor_relay_identity_ed25519_resource.go
+++ b/internal/provider/tor_relay_identity_ed25519_resource.go
@@ -184,5 +184,5 @@ func (r *TorRelayIdentityEd25519Resource) encodePublicKeyPEM(publicKey ed25519.P
 func (r *TorRelayIdentityEd25519Resource) generateSha256Fingerprint(publicKey ed25519.PublicKey) string {
 	publicKeyBytes, _ := x509.MarshalPKIXPublicKey(publicKey)
 	sha256Sum := sha256.Sum256(publicKeyBytes)
-	return fmt.Sprintf("%x", sha256Sum)
+	return fmt.Sprintf("%X", sha256Sum)
 }
diff --git a/internal/provider/tor_relay_identity_ed25519_resource_test.go b/internal/provider/tor_relay_identity_ed25519_resource_test.go
index 50396ea..77f2e07 100644
--- a/internal/provider/tor_relay_identity_ed25519_resource_test.go
+++ b/internal/provider/tor_relay_identity_ed25519_resource_test.go
@@ -27,7 +27,7 @@ func TestAccTorRelayIdentityEd25519Resource(t *testing.T) {
 					// Verify PEM format
 					resource.TestMatchResourceAttr("tor_relay_identity_ed25519.test", "private_key_pem", regexp.MustCompile(`^-----BEGIN PRIVATE KEY-----`)),
 					resource.TestMatchResourceAttr("tor_relay_identity_ed25519.test", "public_key_pem", regexp.MustCompile(`^-----BEGIN PUBLIC KEY-----`)),
-					resource.TestMatchResourceAttr("tor_relay_identity_ed25519.test", "public_key_fingerprint_sha256", regexp.MustCompile(`^[0-9a-f]{64}$`)),
+					resource.TestMatchResourceAttr("tor_relay_identity_ed25519.test", "public_key_fingerprint_sha256", regexp.MustCompile(`^[0-9A-F]{64}$`)),
 				),
 			},
 		},
diff --git a/internal/provider/tor_relay_identity_rsa_resource.go b/internal/provider/tor_relay_identity_rsa_resource.go
index f7f5e00..ed34264 100644
--- a/internal/provider/tor_relay_identity_rsa_resource.go
+++ b/internal/provider/tor_relay_identity_rsa_resource.go
@@ -201,8 +201,8 @@ func (r *TorRelayIdentityRsaResource) generateFingerprints(publicKey *rsa.Public
 	sha1Sum := sha1.Sum(publicKeyBytes)
 	sha256Sum := sha256.Sum256(publicKeyBytes)
 
-	sha1Fingerprint := fmt.Sprintf("%x", sha1Sum)
-	sha256Fingerprint := fmt.Sprintf("%x", sha256Sum)
+	sha1Fingerprint := fmt.Sprintf("%X", sha1Sum)
+	sha256Fingerprint := fmt.Sprintf("%X", sha256Sum)
 
 	return sha1Fingerprint, sha256Fingerprint, nil
 }
diff --git a/internal/provider/tor_relay_identity_rsa_resource_test.go b/internal/provider/tor_relay_identity_rsa_resource_test.go
index a3df3cd..757615f 100644
--- a/internal/provider/tor_relay_identity_rsa_resource_test.go
+++ b/internal/provider/tor_relay_identity_rsa_resource_test.go
@@ -30,8 +30,8 @@ func TestAccTorRelayIdentityRsaResource(t *testing.T) {
 					// Verify PEM format
 					resource.TestMatchResourceAttr("tor_relay_identity_rsa.test", "private_key_pem", regexp.MustCompile(`^-----BEGIN RSA PRIVATE KEY-----`)),
 					resource.TestMatchResourceAttr("tor_relay_identity_rsa.test", "public_key_pem", regexp.MustCompile(`^-----BEGIN PUBLIC KEY-----`)),
-					resource.TestMatchResourceAttr("tor_relay_identity_rsa.test", "public_key_fingerprint_sha1", regexp.MustCompile(`^[0-9a-f]{40}$`)),
-					resource.TestMatchResourceAttr("tor_relay_identity_rsa.test", "public_key_fingerprint_sha256", regexp.MustCompile(`^[0-9a-f]{64}$`)),
+					resource.TestMatchResourceAttr("tor_relay_identity_rsa.test", "public_key_fingerprint_sha1", regexp.MustCompile(`^[0-9A-F]{40}$`)),
+					resource.TestMatchResourceAttr("tor_relay_identity_rsa.test", "public_key_fingerprint_sha256", regexp.MustCompile(`^[0-9A-F]{64}$`)),
 				),
 			},
 		},
@@ -55,7 +55,7 @@ x7BlUBTFnhCZP5nSbwECQGgUr7jW/xrwbkDAP3+ql6o0yyhLMtvIqAKk3fUWxPXO
 OhEqFiIYW5mI//JWsqSZZxy4nMqgejKkrRgOOQbL0NE=
 -----END RSA PRIVATE KEY-----`
 
-	expectedSha1Fingerprint := "da5cec632a9a544394403bd533e1a7bde2f26edd"
+	expectedSha1Fingerprint := "DA5CEC632A9A544394403BD533E1A7BDE2F26EDD"
 
 	block, _ := pem.Decode([]byte(testRsaPrivateKeyPem))
 	if block == nil {