// SPDX-License-Identifier: GPL-2.0-or-later /* * Poly1305 authenticator algorithm, RFC7539 * * Copyright (C) 2015 Martin Willi * * Based on public domain code by Andrew Moon and Daniel J. Bernstein. */ #include #include #include #include #include #include #ifdef CONFIG_CRYPTO_LIB_POLY1305_ARCH #include "poly1305.h" /* $(SRCARCH)/poly1305.h */ #else #define poly1305_block_init poly1305_block_init_generic #define poly1305_blocks poly1305_blocks_generic #define poly1305_emit poly1305_emit_generic #endif void poly1305_init(struct poly1305_desc_ctx *desc, const u8 key[POLY1305_KEY_SIZE]) { desc->s[0] = get_unaligned_le32(key + 16); desc->s[1] = get_unaligned_le32(key + 20); desc->s[2] = get_unaligned_le32(key + 24); desc->s[3] = get_unaligned_le32(key + 28); desc->buflen = 0; poly1305_block_init(&desc->state, key); } EXPORT_SYMBOL(poly1305_init); void poly1305_update(struct poly1305_desc_ctx *desc, const u8 *src, unsigned int nbytes) { if (desc->buflen + nbytes >= POLY1305_BLOCK_SIZE) { unsigned int bulk_len; if (desc->buflen) { unsigned int l = POLY1305_BLOCK_SIZE - desc->buflen; memcpy(&desc->buf[desc->buflen], src, l); src += l; nbytes -= l; poly1305_blocks(&desc->state, desc->buf, POLY1305_BLOCK_SIZE, 1); desc->buflen = 0; } bulk_len = round_down(nbytes, POLY1305_BLOCK_SIZE); nbytes %= POLY1305_BLOCK_SIZE; if (bulk_len) { poly1305_blocks(&desc->state, src, bulk_len, 1); src += bulk_len; } } if (nbytes) { memcpy(&desc->buf[desc->buflen], src, nbytes); desc->buflen += nbytes; } } EXPORT_SYMBOL(poly1305_update); void poly1305_final(struct poly1305_desc_ctx *desc, u8 *dst) { if (unlikely(desc->buflen)) { desc->buf[desc->buflen++] = 1; memset(desc->buf + desc->buflen, 0, POLY1305_BLOCK_SIZE - desc->buflen); poly1305_blocks(&desc->state, desc->buf, POLY1305_BLOCK_SIZE, 0); } poly1305_emit(&desc->state.h, dst, desc->s); *desc = (struct poly1305_desc_ctx){}; } EXPORT_SYMBOL(poly1305_final); #ifdef poly1305_mod_init_arch static int __init poly1305_mod_init(void) { poly1305_mod_init_arch(); return 0; } subsys_initcall(poly1305_mod_init); static void __exit poly1305_mod_exit(void) { } module_exit(poly1305_mod_exit); #endif MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Poly1305 authenticator algorithm, RFC7539");