diff --git a/src/crypto.c b/src/crypto.c
index 07e82b80..e6f6d862 100644
--- a/src/crypto.c
+++ b/src/crypto.c
@@ -53,6 +53,11 @@ int crypto_cipher_key_len(enum crypto_cipher cipher)
 	return 0;
 }
 
+int crypto_cipher_tk_bits(enum crypto_cipher cipher)
+{
+	return crypto_cipher_key_len(cipher) * 8;
+}
+
 int crypto_psk_from_passphrase(const char *passphrase,
 				const unsigned char *ssid, size_t ssid_len,
 				unsigned char *out_psk)
diff --git a/src/crypto.h b/src/crypto.h
index e0b2df35..320c03da 100644
--- a/src/crypto.h
+++ b/src/crypto.h
@@ -32,6 +32,7 @@ enum crypto_cipher {
 };
 
 int crypto_cipher_key_len(enum crypto_cipher cipher);
+int crypto_cipher_tk_bits(enum crypto_cipher cipher);
 
 int crypto_psk_from_passphrase(const char *passphrase,
 				const unsigned char *ssid, size_t ssid_len,