diff --git a/Cargo.lock b/Cargo.lock
index 7854ff7..45c280a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -840,6 +840,7 @@ dependencies = [
  "wedpr_l_crypto_signature_secp256k1",
  "wedpr_l_crypto_signature_sm2",
  "wedpr_l_crypto_vrf_curve25519",
+ "wedpr_l_crypto_vrf_secp256k1",
  "wedpr_l_macros 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "wedpr_l_protos 1.2.0",
  "wedpr_l_utils 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/ffi/ffi_c/ffi_c_crypto_binary/Cargo.toml b/ffi/ffi_c/ffi_c_crypto_binary/Cargo.toml
index b2d68b1..ceb058b 100644
--- a/ffi/ffi_c/ffi_c_crypto_binary/Cargo.toml
+++ b/ffi/ffi_c/ffi_c_crypto_binary/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2018"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 [features]
-default = [ "wedpr_f_ecies_secp256k1", "wedpr_f_signature_secp256k1", "wedpr_f_hash_keccak256", "wedpr_f_signature_sm2", "wedpr_f_hash_sm3", "wedpr_f_vrf_curve25519", "wedpr_f_crypto_block_cipher_aes", "wedpr_f_crypto_block_cipher_sm4", "wedpr_f_hash_ripemd160", "wedpr_f_hash_sha2", "wedpr_f_hash_sha3", "wedpr_f_hash_blake2b", "wedpr_f_signature_ed25519" ]
+default = [ "wedpr_f_ecies_secp256k1", "wedpr_f_signature_secp256k1", "wedpr_f_hash_keccak256", "wedpr_f_signature_sm2", "wedpr_f_hash_sm3", "wedpr_f_vrf_curve25519", "wedpr_f_vrf_secp256k1", "wedpr_f_crypto_block_cipher_aes", "wedpr_f_crypto_block_cipher_sm4", "wedpr_f_hash_ripemd160", "wedpr_f_hash_sha2", "wedpr_f_hash_sha3", "wedpr_f_hash_blake2b", "wedpr_f_signature_ed25519" ]
 wedpr_f_ecies_secp256k1 = [ "wedpr_l_crypto_ecies_secp256k1" ]
 wedpr_f_signature_secp256k1 = [ "wedpr_l_crypto_signature_secp256k1" ]
 wedpr_f_hash_keccak256 = [ "wedpr_l_crypto_hash_keccak256" ]
@@ -18,6 +18,7 @@ wedpr_f_hash_sha2 = [ "wedpr_l_crypto_hash_sha2" ]
 wedpr_f_hash_sha3 = [ "wedpr_l_crypto_hash_sha3" ]
 wedpr_f_hash_blake2b = [ "wedpr_l_crypto_hash_blake2b" ]
 wedpr_f_vrf_curve25519 = [ "wedpr_l_crypto_vrf_curve25519" ]
+wedpr_f_vrf_secp256k1 = [ "wedpr_l_crypto_vrf_secp256k1" ]
 wedpr_f_crypto_block_cipher_aes = [ "wedpr_l_crypto_block_cipher_aes" ]
 wedpr_f_crypto_block_cipher_sm4 = [ "wedpr_l_crypto_block_cipher_sm4" ]
 
@@ -45,6 +46,7 @@ wedpr_l_crypto_signature_ed25519 = { path = "../../../crypto/signature/ed25519",
 wedpr_l_crypto_signature_secp256k1 = { path = "../../../crypto/signature/secp256k1", optional = true }
 wedpr_l_crypto_signature_sm2 = { path = "../../../crypto/signature/sm2", optional = true }
 wedpr_l_crypto_vrf_curve25519 = { path = "../../../crypto/vrf/curve25519", optional = true }
+wedpr_l_crypto_vrf_secp256k1 = { path = "../../../crypto/vrf/secp256k1", optional = true }
 wedpr_l_macros = "1.0.0"
 wedpr_l_protos = { path = "../../../protos" }
 wedpr_l_utils = "1.1.0"
diff --git a/ffi/ffi_c/ffi_c_crypto_binary/src/lib.rs b/ffi/ffi_c/ffi_c_crypto_binary/src/lib.rs
index c20ff4f..162d31b 100644
--- a/ffi/ffi_c/ffi_c_crypto_binary/src/lib.rs
+++ b/ffi/ffi_c/ffi_c_crypto_binary/src/lib.rs
@@ -20,5 +20,6 @@ pub mod ecies;
 pub mod hash;
 pub mod signature;
 pub mod vrf;
+pub mod vrf_secp256k1;
 
 // C/C++ FFI: C-style interfaces will be generated.
diff --git a/ffi/ffi_c/ffi_c_crypto_binary/src/vrf_secp256k1.rs b/ffi/ffi_c/ffi_c_crypto_binary/src/vrf_secp256k1.rs
new file mode 100644
index 0000000..57409fe
--- /dev/null
+++ b/ffi/ffi_c/ffi_c_crypto_binary/src/vrf_secp256k1.rs
@@ -0,0 +1,150 @@
+// Copyright 2020 WeDPR Lab Project Authors. Licensed under Apache-2.0.
+
+//! VRF function wrappers.
+
+#![cfg(not(tarpaulin_include))]
+#![cfg(feature = "wedpr_f_vrf_secp256k1")]
+
+use wedpr_ffi_common::utils::{
+    c_read_raw_pointer, c_write_raw_pointer, CInputBuffer, COutputBuffer,
+    FAILURE, SUCCESS,
+};
+
+#[cfg(feature = "wedpr_f_vrf_secp256k1")]
+use wedpr_l_crypto_vrf_secp256k1::WedprSecp256k1Vrf;
+use wedpr_l_utils::traits::Vrf;
+
+// secp256k1 implementation.
+
+#[no_mangle]
+/// C interface for 'wedpr_secp256k1_vrf_derive_public_key'.
+pub unsafe extern "C" fn wedpr_secp256k1_vrf_derive_public_key(
+    raw_private_key: &CInputBuffer,
+    output_public_key: &mut COutputBuffer,
+) -> i8 {
+    let private_key = c_read_raw_pointer(raw_private_key);
+
+    let public_key = WedprSecp256k1Vrf::derive_public_key(&private_key);
+    std::mem::forget(private_key);
+    c_write_raw_pointer(&public_key, output_public_key);
+    SUCCESS
+}
+
+#[no_mangle]
+/// C interface for 'wedpr_secp256k1_vrf_prove_utf8'.
+pub unsafe extern "C" fn wedpr_secp256k1_vrf_prove_utf8(
+    raw_private_key: &CInputBuffer,
+    raw_utf8_message: &CInputBuffer,
+    output_proof: &mut COutputBuffer,
+) -> i8 {
+    let private_key = c_read_raw_pointer(raw_private_key);
+    let message = c_read_raw_pointer(raw_utf8_message);
+
+    let result = WedprSecp256k1Vrf::prove(&private_key, &message);
+    std::mem::forget(private_key);
+    std::mem::forget(message);
+    let proof = match result {
+        Ok(v) => v,
+        Err(_) => return FAILURE,
+    };
+    c_write_raw_pointer(&proof.encode_proof(), output_proof);
+    SUCCESS
+}
+
+#[no_mangle]
+/// C interface for 'wedpr_secp256k1_vrf_prove_fast_utf8'.
+pub unsafe extern "C" fn wedpr_secp256k1_vrf_prove_fast_utf8(
+    raw_private_key: &CInputBuffer,
+    raw_public_key: &CInputBuffer,
+    raw_utf8_message: &CInputBuffer,
+    output_proof: &mut COutputBuffer,
+) -> i8 {
+    let private_key = c_read_raw_pointer(raw_private_key);
+    let public_key = c_read_raw_pointer(raw_public_key);
+    let message = c_read_raw_pointer(raw_utf8_message);
+
+    let result =
+        WedprSecp256k1Vrf::prove_fast(&private_key, &public_key, &message);
+    std::mem::forget(private_key);
+    std::mem::forget(public_key);
+    std::mem::forget(message);
+    let proof = match result {
+        Ok(v) => v,
+        Err(_) => return FAILURE,
+    };
+    c_write_raw_pointer(&proof.encode_proof(), output_proof);
+    SUCCESS
+}
+
+#[no_mangle]
+/// C interface for 'wedpr_secp256k1_vrf_verify_utf8'.
+pub unsafe extern "C" fn wedpr_secp256k1_vrf_verify_utf8(
+    raw_public_key: &CInputBuffer,
+    raw_utf8_message: &CInputBuffer,
+    raw_proof: &CInputBuffer,
+) -> i8 {
+    let proof_bytes = c_read_raw_pointer(raw_proof);
+    let public_key = c_read_raw_pointer(raw_public_key);
+    let message = c_read_raw_pointer(raw_utf8_message);
+
+    let proof = match WedprSecp256k1Vrf::decode_proof(&proof_bytes) {
+        Ok(v) => v,
+        Err(_) => {
+            std::mem::forget(proof_bytes);
+            std::mem::forget(public_key);
+            std::mem::forget(message);
+            return FAILURE;
+        },
+    };
+
+    let result = proof.verify(&public_key, &message);
+    std::mem::forget(proof_bytes);
+    std::mem::forget(public_key);
+    std::mem::forget(message);
+    match result {
+        true => SUCCESS,
+        false => FAILURE,
+    }
+}
+
+#[no_mangle]
+/// C interface for 'wedpr_secp256k1_vrf_proof_to_hash'.
+pub unsafe extern "C" fn wedpr_secp256k1_vrf_proof_to_hash(
+    raw_proof: &CInputBuffer,
+    output_hash: &mut COutputBuffer,
+) -> i8 {
+    let proof_bytes = c_read_raw_pointer(raw_proof);
+    let proof = match WedprSecp256k1Vrf::decode_proof(&proof_bytes) {
+        Ok(v) => v,
+        Err(_) => {
+            std::mem::forget(proof_bytes);
+            return FAILURE;
+        },
+    };
+
+    let result = proof.proof_to_hash();
+    std::mem::forget(proof_bytes);
+    let hash = match result {
+        Ok(v) => v,
+        Err(_) => {
+            return FAILURE;
+        },
+    };
+    c_write_raw_pointer(&hash, output_hash);
+    SUCCESS
+}
+
+#[no_mangle]
+/// C interface for 'wedpr_secp256k1_vrf_is_valid_public_key'.
+pub unsafe extern "C" fn wedpr_secp256k1_vrf_is_valid_public_key(
+    raw_public_key: &CInputBuffer,
+) -> i8 {
+    let public_key = c_read_raw_pointer(raw_public_key);
+
+    let result = WedprSecp256k1Vrf::is_valid_public_key(&public_key);
+    std::mem::forget(public_key);
+    match result {
+        true => SUCCESS,
+        false => FAILURE,
+    }
+}