summaryrefslogtreecommitdiff
path: root/ecp/src/ecp/crypto/poly1305/poly1305-donna.c
diff options
context:
space:
mode:
Diffstat (limited to 'ecp/src/ecp/crypto/poly1305/poly1305-donna.c')
-rw-r--r--ecp/src/ecp/crypto/poly1305/poly1305-donna.c321
1 files changed, 0 insertions, 321 deletions
diff --git a/ecp/src/ecp/crypto/poly1305/poly1305-donna.c b/ecp/src/ecp/crypto/poly1305/poly1305-donna.c
deleted file mode 100644
index 773ea4e..0000000
--- a/ecp/src/ecp/crypto/poly1305/poly1305-donna.c
+++ /dev/null
@@ -1,321 +0,0 @@
-/* $OpenBSD: poly1305-donna.c,v 1.3 2014/06/12 15:49:30 deraadt Exp $ */
-/*
- * Public Domain poly1305 from Andrew Moon
- * Based on poly1305-donna.c, poly1305-donna-32.h and poly1305-donna.h from:
- * https://github.com/floodyberry/poly1305-donna
- */
-
-#include <stddef.h>
-
-static inline void poly1305_init(poly1305_context *ctx,
- const unsigned char key[32]);
-static inline void poly1305_update(poly1305_context *ctx,
- const unsigned char *m, size_t bytes);
-static inline void poly1305_finish(poly1305_context *ctx,
- unsigned char mac[16]);
-
-/*
- * poly1305 implementation using 32 bit * 32 bit = 64 bit multiplication
- * and 64 bit addition.
- */
-
-#define poly1305_block_size 16
-
-/* 17 + sizeof(size_t) + 14*sizeof(unsigned long) */
-typedef struct poly1305_state_internal_t {
- unsigned long r[5];
- unsigned long h[5];
- unsigned long pad[4];
- size_t leftover;
- unsigned char buffer[poly1305_block_size];
- unsigned char final;
-} poly1305_state_internal_t;
-
-/* interpret four 8 bit unsigned integers as a 32 bit unsigned integer in little endian */
-static unsigned long
-U8TO32(const unsigned char *p)
-{
- return (((unsigned long)(p[0] & 0xff)) |
- ((unsigned long)(p[1] & 0xff) << 8) |
- ((unsigned long)(p[2] & 0xff) << 16) |
- ((unsigned long)(p[3] & 0xff) << 24));
-}
-
-/* store a 32 bit unsigned integer as four 8 bit unsigned integers in little endian */
-static void
-U32TO8(unsigned char *p, unsigned long v)
-{
- p[0] = (v) & 0xff;
- p[1] = (v >> 8) & 0xff;
- p[2] = (v >> 16) & 0xff;
- p[3] = (v >> 24) & 0xff;
-}
-
-static inline void
-poly1305_init(poly1305_context *ctx, const unsigned char key[32])
-{
- poly1305_state_internal_t *st = (poly1305_state_internal_t *)ctx;
-
- /* r &= 0xffffffc0ffffffc0ffffffc0fffffff */
- st->r[0] = (U8TO32(&key[0])) & 0x3ffffff;
- st->r[1] = (U8TO32(&key[3]) >> 2) & 0x3ffff03;
- st->r[2] = (U8TO32(&key[6]) >> 4) & 0x3ffc0ff;
- st->r[3] = (U8TO32(&key[9]) >> 6) & 0x3f03fff;
- st->r[4] = (U8TO32(&key[12]) >> 8) & 0x00fffff;
-
- /* h = 0 */
- st->h[0] = 0;
- st->h[1] = 0;
- st->h[2] = 0;
- st->h[3] = 0;
- st->h[4] = 0;
-
- /* save pad for later */
- st->pad[0] = U8TO32(&key[16]);
- st->pad[1] = U8TO32(&key[20]);
- st->pad[2] = U8TO32(&key[24]);
- st->pad[3] = U8TO32(&key[28]);
-
- st->leftover = 0;
- st->final = 0;
-}
-
-static void
-poly1305_blocks(poly1305_state_internal_t *st, const unsigned char *m, size_t bytes)
-{
- const unsigned long hibit = (st->final) ? 0 : (1 << 24); /* 1 << 128 */
- unsigned long r0, r1, r2, r3, r4;
- unsigned long s1, s2, s3, s4;
- unsigned long h0, h1, h2, h3, h4;
- unsigned long long d0, d1, d2, d3, d4;
- unsigned long c;
-
- r0 = st->r[0];
- r1 = st->r[1];
- r2 = st->r[2];
- r3 = st->r[3];
- r4 = st->r[4];
-
- s1 = r1 * 5;
- s2 = r2 * 5;
- s3 = r3 * 5;
- s4 = r4 * 5;
-
- h0 = st->h[0];
- h1 = st->h[1];
- h2 = st->h[2];
- h3 = st->h[3];
- h4 = st->h[4];
-
- while (bytes >= poly1305_block_size) {
- /* h += m[i] */
- h0 += (U8TO32(m + 0)) & 0x3ffffff;
- h1 += (U8TO32(m + 3) >> 2) & 0x3ffffff;
- h2 += (U8TO32(m + 6) >> 4) & 0x3ffffff;
- h3 += (U8TO32(m + 9) >> 6) & 0x3ffffff;
- h4 += (U8TO32(m + 12) >> 8) | hibit;
-
- /* h *= r */
- d0 = ((unsigned long long)h0 * r0) +
- ((unsigned long long)h1 * s4) +
- ((unsigned long long)h2 * s3) +
- ((unsigned long long)h3 * s2) +
- ((unsigned long long)h4 * s1);
- d1 = ((unsigned long long)h0 * r1) +
- ((unsigned long long)h1 * r0) +
- ((unsigned long long)h2 * s4) +
- ((unsigned long long)h3 * s3) +
- ((unsigned long long)h4 * s2);
- d2 = ((unsigned long long)h0 * r2) +
- ((unsigned long long)h1 * r1) +
- ((unsigned long long)h2 * r0) +
- ((unsigned long long)h3 * s4) +
- ((unsigned long long)h4 * s3);
- d3 = ((unsigned long long)h0 * r3) +
- ((unsigned long long)h1 * r2) +
- ((unsigned long long)h2 * r1) +
- ((unsigned long long)h3 * r0) +
- ((unsigned long long)h4 * s4);
- d4 = ((unsigned long long)h0 * r4) +
- ((unsigned long long)h1 * r3) +
- ((unsigned long long)h2 * r2) +
- ((unsigned long long)h3 * r1) +
- ((unsigned long long)h4 * r0);
-
- /* (partial) h %= p */
- c = (unsigned long)(d0 >> 26);
- h0 = (unsigned long)d0 & 0x3ffffff;
- d1 += c;
- c = (unsigned long)(d1 >> 26);
- h1 = (unsigned long)d1 & 0x3ffffff;
- d2 += c;
- c = (unsigned long)(d2 >> 26);
- h2 = (unsigned long)d2 & 0x3ffffff;
- d3 += c;
- c = (unsigned long)(d3 >> 26);
- h3 = (unsigned long)d3 & 0x3ffffff;
- d4 += c;
- c = (unsigned long)(d4 >> 26);
- h4 = (unsigned long)d4 & 0x3ffffff;
- h0 += c * 5;
- c = (h0 >> 26);
- h0 = h0 & 0x3ffffff;
- h1 += c;
-
- m += poly1305_block_size;
- bytes -= poly1305_block_size;
- }
-
- st->h[0] = h0;
- st->h[1] = h1;
- st->h[2] = h2;
- st->h[3] = h3;
- st->h[4] = h4;
-}
-
-static inline void
-poly1305_update(poly1305_context *ctx, const unsigned char *m, size_t bytes)
-{
- poly1305_state_internal_t *st = (poly1305_state_internal_t *)ctx;
- size_t i;
-
- /* handle leftover */
- if (st->leftover) {
- size_t want = (poly1305_block_size - st->leftover);
- if (want > bytes)
- want = bytes;
- for (i = 0; i < want; i++)
- st->buffer[st->leftover + i] = m[i];
- bytes -= want;
- m += want;
- st->leftover += want;
- if (st->leftover < poly1305_block_size)
- return;
- poly1305_blocks(st, st->buffer, poly1305_block_size);
- st->leftover = 0;
- }
-
- /* process full blocks */
- if (bytes >= poly1305_block_size) {
- size_t want = (bytes & ~(poly1305_block_size - 1));
- poly1305_blocks(st, m, want);
- m += want;
- bytes -= want;
- }
-
- /* store leftover */
- if (bytes) {
- for (i = 0; i < bytes; i++)
- st->buffer[st->leftover + i] = m[i];
- st->leftover += bytes;
- }
-}
-
-static inline void
-poly1305_finish(poly1305_context *ctx, unsigned char mac[16])
-{
- poly1305_state_internal_t *st = (poly1305_state_internal_t *)ctx;
- unsigned long h0, h1, h2, h3, h4, c;
- unsigned long g0, g1, g2, g3, g4;
- unsigned long long f;
- unsigned long mask;
-
- /* process the remaining block */
- if (st->leftover) {
- size_t i = st->leftover;
- st->buffer[i++] = 1;
- for (; i < poly1305_block_size; i++)
- st->buffer[i] = 0;
- st->final = 1;
- poly1305_blocks(st, st->buffer, poly1305_block_size);
- }
-
- /* fully carry h */
- h0 = st->h[0];
- h1 = st->h[1];
- h2 = st->h[2];
- h3 = st->h[3];
- h4 = st->h[4];
-
- c = h1 >> 26;
- h1 = h1 & 0x3ffffff;
- h2 += c;
- c = h2 >> 26;
- h2 = h2 & 0x3ffffff;
- h3 += c;
- c = h3 >> 26;
- h3 = h3 & 0x3ffffff;
- h4 += c;
- c = h4 >> 26;
- h4 = h4 & 0x3ffffff;
- h0 += c * 5;
- c = h0 >> 26;
- h0 = h0 & 0x3ffffff;
- h1 += c;
-
- /* compute h + -p */
- g0 = h0 + 5;
- c = g0 >> 26;
- g0 &= 0x3ffffff;
- g1 = h1 + c;
- c = g1 >> 26;
- g1 &= 0x3ffffff;
- g2 = h2 + c;
- c = g2 >> 26;
- g2 &= 0x3ffffff;
- g3 = h3 + c;
- c = g3 >> 26;
- g3 &= 0x3ffffff;
- g4 = h4 + c - (1 << 26);
-
- /* select h if h < p, or h + -p if h >= p */
- mask = (g4 >> ((sizeof(unsigned long) * 8) - 1)) - 1;
- g0 &= mask;
- g1 &= mask;
- g2 &= mask;
- g3 &= mask;
- g4 &= mask;
- mask = ~mask;
- h0 = (h0 & mask) | g0;
- h1 = (h1 & mask) | g1;
- h2 = (h2 & mask) | g2;
- h3 = (h3 & mask) | g3;
- h4 = (h4 & mask) | g4;
-
- /* h = h % (2^128) */
- h0 = ((h0) | (h1 << 26)) & 0xffffffff;
- h1 = ((h1 >> 6) | (h2 << 20)) & 0xffffffff;
- h2 = ((h2 >> 12) | (h3 << 14)) & 0xffffffff;
- h3 = ((h3 >> 18) | (h4 << 8)) & 0xffffffff;
-
- /* mac = (h + pad) % (2^128) */
- f = (unsigned long long)h0 + st->pad[0];
- h0 = (unsigned long)f;
- f = (unsigned long long)h1 + st->pad[1] + (f >> 32);
- h1 = (unsigned long)f;
- f = (unsigned long long)h2 + st->pad[2] + (f >> 32);
- h2 = (unsigned long)f;
- f = (unsigned long long)h3 + st->pad[3] + (f >> 32);
- h3 = (unsigned long)f;
-
- U32TO8(mac + 0, h0);
- U32TO8(mac + 4, h1);
- U32TO8(mac + 8, h2);
- U32TO8(mac + 12, h3);
-
- /* zero out the state */
- st->h[0] = 0;
- st->h[1] = 0;
- st->h[2] = 0;
- st->h[3] = 0;
- st->h[4] = 0;
- st->r[0] = 0;
- st->r[1] = 0;
- st->r[2] = 0;
- st->r[3] = 0;
- st->r[4] = 0;
- st->pad[0] = 0;
- st->pad[1] = 0;
- st->pad[2] = 0;
- st->pad[3] = 0;
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-19 21:53:22 +0000