diff --git a/.cargo/config.toml b/.cargo/config.toml
new file mode 100644
index 0000000..e2b197d
--- /dev/null
+++ b/.cargo/config.toml
@@ -0,0 +1,2 @@
+[patch.crates-io]
+bssl-sys = { version = "0.1.0", path = "../../../boringssl/src/rust/bssl-sys", optional=true }
diff --git a/src/cipher.rs b/src/cipher.rs
index ab5f49d..84a8265 100644
--- a/src/cipher.rs
+++ b/src/cipher.rs
@@ -208,6 +208,7 @@ impl Cipher {
         unsafe { CipherRef::from_ptr(ffi::EVP_aes_192_cfb1() as *mut _) }
     }
 
+    #[cfg(not(boringssl))]
     pub fn aes_192_cfb128() -> &'static CipherRef {
         unsafe { CipherRef::from_ptr(ffi::EVP_aes_192_cfb128() as *mut _) }
     }
@@ -253,6 +254,7 @@ impl Cipher {
         unsafe { CipherRef::from_ptr(ffi::EVP_aes_256_cfb1() as *mut _) }
     }
 
+    #[cfg(not(boringssl))]
     pub fn aes_256_cfb128() -> &'static CipherRef {
         unsafe { CipherRef::from_ptr(ffi::EVP_aes_256_cfb128() as *mut _) }
     }
@@ -282,11 +284,13 @@ impl Cipher {
     }
 
     #[cfg(not(osslconf = "OPENSSL_NO_BF"))]
+    #[cfg(not(boringssl))]
     pub fn bf_cbc() -> &'static CipherRef {
         unsafe { CipherRef::from_ptr(ffi::EVP_bf_cbc() as *mut _) }
     }
 
     #[cfg(not(osslconf = "OPENSSL_NO_BF"))]
+    #[cfg(not(boringssl))]
     pub fn bf_ecb() -> &'static CipherRef {
         unsafe { CipherRef::from_ptr(ffi::EVP_bf_ecb() as *mut _) }
     }
diff --git a/src/encrypt.rs b/src/encrypt.rs
index 3cb10fc..34a9eb8 100644
--- a/src/encrypt.rs
+++ b/src/encrypt.rs
@@ -148,7 +148,7 @@ impl<'a> Encrypter<'a> {
     /// This corresponds to [`EVP_PKEY_CTX_set_rsa_oaep_md`].
     ///
     /// [`EVP_PKEY_CTX_set_rsa_oaep_md`]: https://www.openssl.org/docs/manmaster/man3/EVP_PKEY_CTX_set_rsa_oaep_md.html
-    #[cfg(any(ossl102, libressl310))]
+    #[cfg(any(ossl102, libressl310, boringssl))]
     pub fn set_rsa_oaep_md(&mut self, md: MessageDigest) -> Result<(), ErrorStack> {
         unsafe {
             cvt(ffi::EVP_PKEY_CTX_set_rsa_oaep_md(
@@ -352,7 +352,7 @@ impl<'a> Decrypter<'a> {
     /// This corresponds to [`EVP_PKEY_CTX_set_rsa_oaep_md`].
     ///
     /// [`EVP_PKEY_CTX_set_rsa_oaep_md`]: https://www.openssl.org/docs/manmaster/man3/EVP_PKEY_CTX_set_rsa_oaep_md.html
-    #[cfg(any(ossl102, libressl310))]
+    #[cfg(any(ossl102, libressl310, boringssl))]
     pub fn set_rsa_oaep_md(&mut self, md: MessageDigest) -> Result<(), ErrorStack> {
         unsafe {
             cvt(ffi::EVP_PKEY_CTX_set_rsa_oaep_md(
diff --git a/src/lib.rs b/src/lib.rs
index 891651e..f149bfd 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -120,6 +120,9 @@
 #![doc(html_root_url = "https://docs.rs/openssl/0.10")]
 #![warn(rust_2018_idioms)]
 
+#[cfg(all(soong, boringssl))]
+extern crate bssl_sys as ffi;
+
 #[doc(inline)]
 pub use ffi::init;
 
@@ -155,6 +158,10 @@ pub mod ex_data;
 #[cfg(not(any(libressl, ossl300)))]
 pub mod fips;
 pub mod hash;
+#[cfg(boringssl)]
+pub mod hkdf;
+#[cfg(boringssl)]
+pub mod hmac;
 #[cfg(ossl300)]
 pub mod lib_ctx;
 pub mod md;
diff --git a/src/symm.rs b/src/symm.rs
index c75bbc0..beff5fc 100644
--- a/src/symm.rs
+++ b/src/symm.rs
@@ -119,6 +119,7 @@ impl Cipher {
         unsafe { Cipher(ffi::EVP_aes_128_cfb1()) }
     }
 
+    #[cfg(not(boringssl))]
     pub fn aes_128_cfb128() -> Cipher {
         unsafe { Cipher(ffi::EVP_aes_128_cfb128()) }
     }
@@ -164,6 +165,7 @@ impl Cipher {
         unsafe { Cipher(ffi::EVP_aes_192_cfb1()) }
     }
 
+    #[cfg(not(boringssl))]
     pub fn aes_192_cfb128() -> Cipher {
         unsafe { Cipher(ffi::EVP_aes_192_cfb128()) }
     }
@@ -214,6 +216,7 @@ impl Cipher {
         unsafe { Cipher(ffi::EVP_aes_256_cfb1()) }
     }
 
+    #[cfg(not(boringssl))]
     pub fn aes_256_cfb128() -> Cipher {
         unsafe { Cipher(ffi::EVP_aes_256_cfb128()) }
     }
@@ -242,12 +245,12 @@ impl Cipher {
         unsafe { Cipher(ffi::EVP_aes_256_ocb()) }
     }
 
-    #[cfg(not(osslconf = "OPENSSL_NO_BF"))]
+    #[cfg(not(any(boringssl, osslconf = "OPENSSL_NO_BF")))]
     pub fn bf_cbc() -> Cipher {
         unsafe { Cipher(ffi::EVP_bf_cbc()) }
     }
 
-    #[cfg(not(osslconf = "OPENSSL_NO_BF"))]
+    #[cfg(not(any(boringssl, osslconf = "OPENSSL_NO_BF")))]
     pub fn bf_ecb() -> Cipher {
         unsafe { Cipher(ffi::EVP_bf_ecb()) }
     }