From 16e64105ff539acda5bdf6e8dedb20496038e629 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Wed, 5 Jan 2022 23:06:06 +0100 Subject: First commit MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- libblake_internal_blakes_digest.c | 72 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 libblake_internal_blakes_digest.c (limited to 'libblake_internal_blakes_digest.c') diff --git a/libblake_internal_blakes_digest.c b/libblake_internal_blakes_digest.c new file mode 100644 index 0000000..79f5528 --- /dev/null +++ b/libblake_internal_blakes_digest.c @@ -0,0 +1,72 @@ +/* See LICENSE file for copyright and license details. */ +#include "common.h" + +static void +encode_uint32_be(unsigned char *out, uint_least64_t value) +{ + out[0] = (unsigned char)((value >> 24) & 255); + out[1] = (unsigned char)((value >> 16) & 255); + out[2] = (unsigned char)((value >> 8) & 255); + out[3] = (unsigned char)((value >> 0) & 255); +} + +void +libblake_internal_blakes_digest(struct libblake_blakes_state *state, unsigned char *data, size_t len, + size_t bits, const char *suffix, unsigned char *output, size_t words_out) +{ + size_t r, i; + unsigned char pad; + uint_least32_t t0, t1; + + len += bits >> 3; + bits &= 7; + if (suffix) { + while (*suffix) { + data[len] |= (unsigned char)((*suffix++ & 1) << bits++); + if (bits == 8) { + bits = 0; + data[++len] = 0; + } + } + } + + r = libblake_internal_blakes_update(state, data, len); + data = &data[r]; + len -= r; + + pad = 0x80 >> bits; + data[len] &= (unsigned char)(255U - (pad - 1U)); + data[len] |= pad; + bits += len << 3; + + t0 = state->t[0] + (uint_least32_t)bits; + t1 = state->t[1]; + + if (!bits) { + state->t[0] = UINT_LEAST32_C(0xFFFFfe00); + state->t[1] = UINT_LEAST32_C(0xFFFFffff); + } else if (!state->t[0]) { + state->t[0] = UINT_LEAST32_C(0xFFFFfe00) + (uint_least32_t)bits; + state->t[1] = (state->t[1] - 1) & UINT_LEAST32_C(0xFFFFffff); + } else { + state->t[1] -= (uint_least32_t)(512U - bits); + } + + if (bits < 512 - (1 + 2 * 32)) { + memset(&data[len + 1], 0, (512 - 2 * 32) / 8 - 1 - len); + } else { + memset(&data[len + 1], 0, 512 / 8 - 1 - len); + data += libblake_internal_blakes_update(state, data, 512 / 8); + state->t[0] = UINT_LEAST32_C(0xFFFFfe00); + state->t[1] = UINT_LEAST32_C(0xFFFFffff); + memset(data, 0, (512 - 2 * 32) / 8 - len); + } + if (words_out == 8) + data[(512 - 2 * 32) / 8 - 1] |= 1; + encode_uint32_be(&data[(512 - 2 * 32) / 8], t1); + encode_uint32_be(&data[(512 - 1 * 32) / 8], t0); + libblake_internal_blakes_update(state, data, 512 / 8); + + for (i = 0; i < words_out; i++) + encode_uint32_be(&output[i * 4], state->h[i]); +} -- cgit v1.2.3-70-g09d2