From d4ce8327ff902b5ecd42d057063c03793e6d91c2 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Sun, 15 Sep 2024 02:15:08 +0200 Subject: Organise files MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- hmac/libkeccak_hmac_fast_update.c | 52 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 hmac/libkeccak_hmac_fast_update.c (limited to 'hmac/libkeccak_hmac_fast_update.c') diff --git a/hmac/libkeccak_hmac_fast_update.c b/hmac/libkeccak_hmac_fast_update.c new file mode 100644 index 0000000..fe163b7 --- /dev/null +++ b/hmac/libkeccak_hmac_fast_update.c @@ -0,0 +1,52 @@ +/* See LICENSE file for copyright and license details. */ +#include "../common.h" + + +/** + * Absorb more, or the first part, of the message + * without wiping sensitive data when possible + * + * @param state The hashing state + * @param msg_ The partial message + * @param msglen The length of the partial message, in bytes + * @return Zero on success, -1 on error + */ +int +libkeccak_hmac_fast_update(struct libkeccak_hmac_state *restrict state, const void *restrict msg_, size_t msglen) +{ + const unsigned char *restrict msg = msg_; + void *new; + size_t i; + int n, cn; + + if (state->key_ipad) { + if (libkeccak_fast_update(&state->sponge, state->key_ipad, state->key_length >> 3) < 0) + return -1; + if (state->key_length & 7) + state->leftover = state->key_ipad[state->key_length >> 3]; + state->key_ipad = NULL; + } + + if (!msg || !msglen) + return 0; + + if (!(state->key_length & 7)) + return libkeccak_fast_update(&state->sponge, msg, msglen); + + if (msglen != state->buffer_size) { + new = realloc(state->buffer, msglen); + if (!new) + return -1; + state->buffer = new; + state->buffer_size = msglen; + } + + n = (int)(state->key_length & 7); + cn = 8 - n; + for (i = 1; i < msglen; i++) + state->buffer[i] = (unsigned char)((msg[i - 1] >> cn) | (msg[i] << n)); + state->buffer[0] = (unsigned char)((state->leftover & ((1 << n) - 1)) | (msg[0] << n)); + state->leftover = (unsigned char)(msg[msglen - 1] >> cn); + + return libkeccak_fast_update(&state->sponge, state->buffer, msglen); +} -- cgit v1.2.3-70-g09d2