79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Poly1305 authenticator algorithm, RFC7539
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*
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* Copyright (C) 2015 Martin Willi
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*
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* Based on public domain code by Andrew Moon and Daniel J. Bernstein.
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*/
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#include <crypto/internal/poly1305.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <asm/unaligned.h>
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void poly1305_init_generic(struct poly1305_desc_ctx *desc,
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const u8 key[POLY1305_KEY_SIZE])
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{
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poly1305_core_setkey(&desc->core_r, key);
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desc->s[0] = get_unaligned_le32(key + 16);
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desc->s[1] = get_unaligned_le32(key + 20);
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desc->s[2] = get_unaligned_le32(key + 24);
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desc->s[3] = get_unaligned_le32(key + 28);
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poly1305_core_init(&desc->h);
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desc->buflen = 0;
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desc->sset = true;
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desc->rset = 2;
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}
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EXPORT_SYMBOL_GPL(poly1305_init_generic);
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void poly1305_update_generic(struct poly1305_desc_ctx *desc, const u8 *src,
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unsigned int nbytes)
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{
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unsigned int bytes;
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if (unlikely(desc->buflen)) {
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bytes = min(nbytes, POLY1305_BLOCK_SIZE - desc->buflen);
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memcpy(desc->buf + desc->buflen, src, bytes);
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src += bytes;
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nbytes -= bytes;
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desc->buflen += bytes;
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if (desc->buflen == POLY1305_BLOCK_SIZE) {
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poly1305_core_blocks(&desc->h, &desc->core_r, desc->buf,
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1, 1);
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desc->buflen = 0;
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}
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}
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if (likely(nbytes >= POLY1305_BLOCK_SIZE)) {
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poly1305_core_blocks(&desc->h, &desc->core_r, src,
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nbytes / POLY1305_BLOCK_SIZE, 1);
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src += nbytes - (nbytes % POLY1305_BLOCK_SIZE);
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nbytes %= POLY1305_BLOCK_SIZE;
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}
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if (unlikely(nbytes)) {
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desc->buflen = nbytes;
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memcpy(desc->buf, src, nbytes);
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}
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}
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EXPORT_SYMBOL_GPL(poly1305_update_generic);
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void poly1305_final_generic(struct poly1305_desc_ctx *desc, u8 *dst)
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{
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if (unlikely(desc->buflen)) {
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desc->buf[desc->buflen++] = 1;
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memset(desc->buf + desc->buflen, 0,
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POLY1305_BLOCK_SIZE - desc->buflen);
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poly1305_core_blocks(&desc->h, &desc->core_r, desc->buf, 1, 0);
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}
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poly1305_core_emit(&desc->h, desc->s, dst);
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*desc = (struct poly1305_desc_ctx){};
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}
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EXPORT_SYMBOL_GPL(poly1305_final_generic);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
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