From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- lib/crypto/poly1305.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 lib/crypto/poly1305.c (limited to 'lib/crypto/poly1305.c') diff --git a/lib/crypto/poly1305.c b/lib/crypto/poly1305.c new file mode 100644 index 000000000..26d87fc38 --- /dev/null +++ b/lib/crypto/poly1305.c @@ -0,0 +1,78 @@ +// 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 + +void poly1305_init_generic(struct poly1305_desc_ctx *desc, + const u8 key[POLY1305_KEY_SIZE]) +{ + poly1305_core_setkey(&desc->core_r, key); + 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); + poly1305_core_init(&desc->h); + desc->buflen = 0; + desc->sset = true; + desc->rset = 2; +} +EXPORT_SYMBOL_GPL(poly1305_init_generic); + +void poly1305_update_generic(struct poly1305_desc_ctx *desc, const u8 *src, + unsigned int nbytes) +{ + unsigned int bytes; + + if (unlikely(desc->buflen)) { + bytes = min(nbytes, POLY1305_BLOCK_SIZE - desc->buflen); + memcpy(desc->buf + desc->buflen, src, bytes); + src += bytes; + nbytes -= bytes; + desc->buflen += bytes; + + if (desc->buflen == POLY1305_BLOCK_SIZE) { + poly1305_core_blocks(&desc->h, &desc->core_r, desc->buf, + 1, 1); + desc->buflen = 0; + } + } + + if (likely(nbytes >= POLY1305_BLOCK_SIZE)) { + poly1305_core_blocks(&desc->h, &desc->core_r, src, + nbytes / POLY1305_BLOCK_SIZE, 1); + src += nbytes - (nbytes % POLY1305_BLOCK_SIZE); + nbytes %= POLY1305_BLOCK_SIZE; + } + + if (unlikely(nbytes)) { + desc->buflen = nbytes; + memcpy(desc->buf, src, nbytes); + } +} +EXPORT_SYMBOL_GPL(poly1305_update_generic); + +void poly1305_final_generic(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_core_blocks(&desc->h, &desc->core_r, desc->buf, 1, 0); + } + + poly1305_core_emit(&desc->h, desc->s, dst); + *desc = (struct poly1305_desc_ctx){}; +} +EXPORT_SYMBOL_GPL(poly1305_final_generic); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Martin Willi "); -- cgit v1.2.3