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Diffstat (limited to 'sys/contrib/libsodium/src/libsodium/crypto_onetimeauth/poly1305/donna/poly1305_donna32.h')
-rw-r--r--sys/contrib/libsodium/src/libsodium/crypto_onetimeauth/poly1305/donna/poly1305_donna32.h235
1 files changed, 235 insertions, 0 deletions
diff --git a/sys/contrib/libsodium/src/libsodium/crypto_onetimeauth/poly1305/donna/poly1305_donna32.h b/sys/contrib/libsodium/src/libsodium/crypto_onetimeauth/poly1305/donna/poly1305_donna32.h
new file mode 100644
index 000000000000..cef64480483b
--- /dev/null
+++ b/sys/contrib/libsodium/src/libsodium/crypto_onetimeauth/poly1305/donna/poly1305_donna32.h
@@ -0,0 +1,235 @@
+/*
+ poly1305 implementation using 32 bit * 32 bit = 64 bit multiplication
+ and 64 bit addition
+*/
+
+#if defined(_MSC_VER)
+# define POLY1305_NOINLINE __declspec(noinline)
+#elif defined(__clang__) || defined(__GNUC__)
+# define POLY1305_NOINLINE __attribute__((noinline))
+#else
+# define POLY1305_NOINLINE
+#endif
+
+#include "private/common.h"
+
+#define poly1305_block_size 16
+
+/* 17 + sizeof(unsigned long long) + 14*sizeof(unsigned long) */
+typedef struct poly1305_state_internal_t {
+ unsigned long r[5];
+ unsigned long h[5];
+ unsigned long pad[4];
+ unsigned long long leftover;
+ unsigned char buffer[poly1305_block_size];
+ unsigned char final;
+} poly1305_state_internal_t;
+
+static void
+poly1305_init(poly1305_state_internal_t *st, const unsigned char key[32])
+{
+ /* r &= 0xffffffc0ffffffc0ffffffc0fffffff - wiped after finalization */
+ st->r[0] = (LOAD32_LE(&key[0])) & 0x3ffffff;
+ st->r[1] = (LOAD32_LE(&key[3]) >> 2) & 0x3ffff03;
+ st->r[2] = (LOAD32_LE(&key[6]) >> 4) & 0x3ffc0ff;
+ st->r[3] = (LOAD32_LE(&key[9]) >> 6) & 0x3f03fff;
+ st->r[4] = (LOAD32_LE(&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] = LOAD32_LE(&key[16]);
+ st->pad[1] = LOAD32_LE(&key[20]);
+ st->pad[2] = LOAD32_LE(&key[24]);
+ st->pad[3] = LOAD32_LE(&key[28]);
+
+ st->leftover = 0;
+ st->final = 0;
+}
+
+static void
+poly1305_blocks(poly1305_state_internal_t *st, const unsigned char *m,
+ unsigned long long bytes)
+{
+ const unsigned long hibit = (st->final) ? 0UL : (1UL << 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 += (LOAD32_LE(m + 0)) & 0x3ffffff;
+ h1 += (LOAD32_LE(m + 3) >> 2) & 0x3ffffff;
+ h2 += (LOAD32_LE(m + 6) >> 4) & 0x3ffffff;
+ h3 += (LOAD32_LE(m + 9) >> 6) & 0x3ffffff;
+ h4 += (LOAD32_LE(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 POLY1305_NOINLINE void
+poly1305_finish(poly1305_state_internal_t *st, unsigned char mac[16])
+{
+ 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) {
+ unsigned long long 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 - (1UL << 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;
+
+ STORE32_LE(mac + 0, (uint32_t) h0);
+ STORE32_LE(mac + 4, (uint32_t) h1);
+ STORE32_LE(mac + 8, (uint32_t) h2);
+ STORE32_LE(mac + 12, (uint32_t) h3);
+
+ /* zero out the state */
+ sodium_memzero((void *) st, sizeof *st);
+}
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