From 5ff4c5af715d098852d124de116d354ee10f4ea4 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Mon, 11 Feb 2019 16:22:00 +0100 Subject: Split most .c files into one per function and flatten file hierarchy MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- libkeccak_hmac_unmarshal.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 libkeccak_hmac_unmarshal.c (limited to 'libkeccak_hmac_unmarshal.c') diff --git a/libkeccak_hmac_unmarshal.c b/libkeccak_hmac_unmarshal.c new file mode 100644 index 0000000..e64cd08 --- /dev/null +++ b/libkeccak_hmac_unmarshal.c @@ -0,0 +1,50 @@ +/* See LICENSE file for copyright and license details. */ +#include "common.h" + + +/** + * Unmarshal a `libkeccak_hmac_state_t` from a buffer + * + * @param state The slot for the unmarshalled state, must not be initialised (memory leak otherwise) + * @param data The input buffer + * @return The number of bytes read from `data`, 0 on error + */ +size_t +libkeccak_hmac_unmarshal(libkeccak_hmac_state_t *restrict state, const void *restrict data_) +{ + const char *restrict data = data_; + size_t parsed, size, i; + + state->key_opad = NULL; + state->key_ipad = NULL; + + parsed = libkeccak_state_unmarshal(&state->sponge, data); + if (parsed == 0) + return 0; + + data += parsed / sizeof(char); + state->key_length = *(const size_t *)data; + data += sizeof(size_t) / sizeof(char); + size = (state->key_length + 7) >> 3; + + state->key_opad = malloc(2 * size); + if (!state->key_opad) { + libkeccak_state_destroy(&state->sponge); + return 0; + } + memcpy(state->key_opad, data, size); + data += size / sizeof(char); + + if (data[0]) { + state->key_ipad = state->key_opad + size / sizeof(char); + memcpy(state->key_ipad, state->key_opad, size); + for (i = 0; i < size / sizeof(char); i++) + state->key_ipad[i] ^= (char)(HMAC_OUTER_PAD ^ HMAC_INNER_PAD); + } + + state->leftover = data[1]; + state->buffer = NULL; + state->buffer_size = 0; + + return parsed + sizeof(size_t) + size + 2 * sizeof(char); +} -- cgit v1.2.3-70-g09d2