diff --git a/src/crypto/crypto_openssl.c b/src/crypto/crypto_openssl.c
index f158ef4..9834b25 100644
--- a/src/crypto/crypto_openssl.c
+++ b/src/crypto/crypto_openssl.c
@@ -324,6 +324,56 @@
 }
 
 
+int aes_128_cbc_encrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len)
+{
+	EVP_CIPHER_CTX ctx;
+	int clen, len;
+	u8 buf[16];
+
+	EVP_CIPHER_CTX_init(&ctx);
+	if (EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, key, iv) != 1)
+		return -1;
+	EVP_CIPHER_CTX_set_padding(&ctx, 0);
+
+	clen = data_len;
+	if (EVP_EncryptUpdate(&ctx, data, &clen, data, data_len) != 1 ||
+	    clen != (int) data_len)
+		return -1;
+
+	len = sizeof(buf);
+	if (EVP_EncryptFinal_ex(&ctx, buf, &len) != 1 || len != 0)
+		return -1;
+	EVP_CIPHER_CTX_cleanup(&ctx);
+
+	return 0;
+}
+
+
+int aes_128_cbc_decrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len)
+{
+	EVP_CIPHER_CTX ctx;
+	int plen, len;
+	u8 buf[16];
+
+	EVP_CIPHER_CTX_init(&ctx);
+	if (EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, key, iv) != 1)
+		return -1;
+	EVP_CIPHER_CTX_set_padding(&ctx, 0);
+
+	plen = data_len;
+	if (EVP_DecryptUpdate(&ctx, data, &plen, data, data_len) != 1 ||
+	    plen != (int) data_len)
+		return -1;
+
+	len = sizeof(buf);
+	if (EVP_DecryptFinal_ex(&ctx, buf, &len) != 1 || len != 0)
+		return -1;
+	EVP_CIPHER_CTX_cleanup(&ctx);
+
+	return 0;
+}
+
+
 int crypto_mod_exp(const u8 *base, size_t base_len,
 		   const u8 *power, size_t power_len,
 		   const u8 *modulus, size_t modulus_len,
diff --git a/src/crypto/sha1-tlsprf.c b/src/crypto/sha1-tlsprf.c
index 0effd9b..f9bc0eb 100644
--- a/src/crypto/sha1-tlsprf.c
+++ b/src/crypto/sha1-tlsprf.c
@@ -95,5 +95,10 @@
 		SHA1_pos++;
 	}
 
+	os_memset(A_MD5, 0, MD5_MAC_LEN);
+	os_memset(P_MD5, 0, MD5_MAC_LEN);
+	os_memset(A_SHA1, 0, SHA1_MAC_LEN);
+	os_memset(P_SHA1, 0, SHA1_MAC_LEN);
+
 	return 0;
 }
diff --git a/src/crypto/sha1-tprf.c b/src/crypto/sha1-tprf.c
index a529494..562510f 100644
--- a/src/crypto/sha1-tprf.c
+++ b/src/crypto/sha1-tprf.c
@@ -66,5 +66,7 @@
 		len[0] = SHA1_MAC_LEN;
 	}
 
+	os_memset(hash, 0, SHA1_MAC_LEN);
+
 	return 0;
 }
diff --git a/src/crypto/sha256-kdf.c b/src/crypto/sha256-kdf.c
index d8a1beb..e7509ce 100644
--- a/src/crypto/sha256-kdf.c
+++ b/src/crypto/sha256-kdf.c
@@ -61,6 +61,7 @@
 
 		if (iter == 255) {
 			os_memset(out, 0, outlen);
+			os_memset(T, 0, SHA256_MAC_LEN);
 			return -1;
 		}
 		iter++;
@@ -68,9 +69,11 @@
 		if (hmac_sha256_vector(secret, secret_len, 4, addr, len, T) < 0)
 		{
 			os_memset(out, 0, outlen);
+			os_memset(T, 0, SHA256_MAC_LEN);
 			return -1;
 		}
 	}
 
+	os_memset(T, 0, SHA256_MAC_LEN);
 	return 0;
 }