Add botan_cipher_reset to FFI

2 files changed, 15 insertions, 0 deletions

diff --git a/src/lib/ffi/ffi.h b/src/lib/ffi/ffi.h
index 19e04ce4d..ed3e0bb71 100644
--- a/src/lib/ffi/ffi.h
+++ b/src/lib/ffi/ffi.h
@@ -467,6 +467,16 @@ BOTAN_PUBLIC_API(2,0) int botan_cipher_set_key(botan_cipher_t cipher,
                                                const uint8_t* key, size_t key_len);
 
 /**
+* Reset the message specific state for this cipher.
+* Without resetting the keys, this resets the nonce, and any state
+* associated with any message bits that have been processed so far.
+*
+* It is conceptually equivalent to calling botan_cipher_clear followed
+* by botan_cipher_set_key with the original key.
+*/
+BOTAN_PUBLIC_API(2,8) int botan_cipher_reset(botan_cipher_t cipher);
+
+/**
 * Set the associated data. Will fail if cipher is not an AEAD
 */
 BOTAN_PUBLIC_API(2,0) int botan_cipher_set_associated_data(botan_cipher_t cipher,
diff --git a/src/lib/ffi/ffi_cipher.cpp b/src/lib/ffi/ffi_cipher.cpp
index e9adc8637..ec6893405 100644
--- a/src/lib/ffi/ffi_cipher.cpp
+++ b/src/lib/ffi/ffi_cipher.cpp
@@ -41,6 +41,11 @@ int botan_cipher_clear(botan_cipher_t cipher)
    return BOTAN_FFI_DO(Botan::Cipher_Mode, cipher, c, { c.clear(); });
    }
 
+int botan_cipher_reset(botan_cipher_t cipher)
+   {
+   return BOTAN_FFI_DO(Botan::Cipher_Mode, cipher, c, { c.reset(); });
+   }
+
 int botan_cipher_output_length(botan_cipher_t cipher, size_t in_len, size_t* out_len)
    {
    if(out_len == nullptr)