diff --git a/ylong_http_client/src/util/c_openssl/ffi/x509.rs b/ylong_http_client/src/util/c_openssl/ffi/x509.rs
index 2f046aa..9936cfd 100644
--- a/ylong_http_client/src/util/c_openssl/ffi/x509.rs
+++ b/ylong_http_client/src/util/c_openssl/ffi/x509.rs
@@ -36,9 +36,9 @@ extern "C" {
 
     pub(crate) fn EVP_DigestFinal_ex(
         ctx: *mut EVP_MD_CTX,
-        buf: *const c_uchar,
-        start: *const c_uint,
-    );
+        buf: *mut c_uchar,
+        out_len: *mut c_uint,
+    ) -> c_int;
 }
 
 pub(crate) enum C_X509 {}
@@ -149,5 +149,5 @@ extern "C" {
 
     pub(crate) fn X509_PUBKEY_free(x509: *mut X509_PUBKEY);
 
-    pub(crate) fn i2d_X509_PUBKEY(pubkey: *const X509_PUBKEY, buf: *mut *const c_uchar) -> c_int;
+    pub(crate) fn i2d_X509_PUBKEY(pubkey: *const X509_PUBKEY, buf: *mut *mut c_uchar) -> c_int;
 }
diff --git a/ylong_http_client/src/util/c_openssl/ssl/stream.rs b/ylong_http_client/src/util/c_openssl/ssl/stream.rs
index 2bf766c..eeff9ec 100644
--- a/ylong_http_client/src/util/c_openssl/ssl/stream.rs
+++ b/ylong_http_client/src/util/c_openssl/ssl/stream.rs
@@ -305,6 +305,13 @@ pub(crate) fn verify_server_cert(ssl: *const SSL, pinned_key: &str) -> Result<()
 
 fn verify_pinned_pubkey(pinned_key: &str, certificate: *mut C_X509) -> Result<(), SslError> {
     let pubkey = unsafe { X509_get_X509_PUBKEY(certificate) };
+    if pubkey.is_null() {
+        unsafe { X509_free(certificate) };
+        return Err(SslError {
+            code: SslErrorCode::SSL,
+            internal: Some(InternalError::Ssl(ErrorStack::get())),
+        });
+    }
     // Get the length of the serialized data
     let buf_size = unsafe { i2d_X509_PUBKEY(pubkey, ptr::null_mut()) };
 
@@ -315,9 +322,10 @@ fn verify_pinned_pubkey(pinned_key: &str, certificate: *mut C_X509) -> Result<()
             internal: Some(InternalError::Ssl(ErrorStack::get())),
         });
     }
-    let key = vec![0u8; buf_size as usize];
+    let mut key = vec![0u8; buf_size as usize];
+    let mut key_ptr = key.as_mut_ptr();
     // The actual serialization
-    let serialized_data_size = unsafe { i2d_X509_PUBKEY(pubkey, &mut key.as_ptr()) };
+    let serialized_data_size = unsafe { i2d_X509_PUBKEY(pubkey, &mut key_ptr) };
 
     if buf_size != serialized_data_size || serialized_data_size <= 0 {
         unsafe { X509_free(certificate) };
diff --git a/ylong_http_client/src/util/c_openssl/verify/pinning.rs b/ylong_http_client/src/util/c_openssl/verify/pinning.rs
index 2b4984a..1a4315c 100644
--- a/ylong_http_client/src/util/c_openssl/verify/pinning.rs
+++ b/ylong_http_client/src/util/c_openssl/verify/pinning.rs
@@ -13,7 +13,7 @@
 
 use std::collections::HashMap;
 
-use libc::c_int;
+use libc::{c_int, c_uint};
 use ylong_http::request::uri::Uri;
 
 use crate::util::c_openssl::error::ErrorStack;
@@ -25,6 +25,9 @@ use crate::util::c_openssl::ssl::{InternalError, SslError, SslErrorCode};
 use crate::ErrorKind::Build;
 use crate::HttpClientError;
 
+/// OpenSSL EVP digest functions convention: 1 for success, 0 for failure.
+const EVP_DIGEST_SUCCESS: c_int = 1;
+
 /// A structure that serves Certificate and Public Key Pinning.
 /// The map key is server authority(host:port), value is Base64(sha256(Server's
 /// Public Key)).
@@ -248,21 +251,32 @@ pub(crate) unsafe fn sha256_digest(
             internal: Some(InternalError::Ssl(ErrorStack::get())),
         });
     }
-    let init = EVP_DigestInit(md_ctx, EVP_sha256());
-    if init == 0 {
+    if EVP_DigestInit(md_ctx, EVP_sha256()) != EVP_DIGEST_SUCCESS {
+        EVP_MD_CTX_free(md_ctx);
+        return Err(SslError {
+            code: SslErrorCode::SSL,
+            internal: Some(InternalError::Ssl(ErrorStack::get())),
+        });
+    }
+    if EVP_DigestUpdate(md_ctx, pub_key.as_ptr(), len) != EVP_DIGEST_SUCCESS {
         EVP_MD_CTX_free(md_ctx);
         return Err(SslError {
             code: SslErrorCode::SSL,
             internal: Some(InternalError::Ssl(ErrorStack::get())),
         });
     }
-    EVP_DigestUpdate(md_ctx, pub_key.as_ptr(), len);
-
-    let start = 0;
-    EVP_DigestFinal_ex(md_ctx, digest.as_mut_ptr(), &start);
 
+    let mut out_len: c_uint = 0;
+    let final_ret = EVP_DigestFinal_ex(md_ctx, digest.as_mut_ptr(), &mut out_len);
     EVP_MD_CTX_free(md_ctx);
 
+    if final_ret != EVP_DIGEST_SUCCESS {
+        return Err(SslError {
+            code: SslErrorCode::SSL,
+            internal: Some(InternalError::Ssl(ErrorStack::get())),
+        });
+    }
+
     Ok(())
 }