/* nettle, low-level cryptographics library
- *
+ *
* Placed by the author under public domain or the MIT license.
* (see https://github.com/floodyberry/poly1305-donna )
* Modified for nettle by Nikos Mavrogiannopoulos.
#include "macros.h"
#include "nettle-types.h"
#include "poly1305.h"
-
+
#define mul32x32_64(a,b) ((uint64_t)(a) * (b))
void poly1305_set_key(struct poly1305_ctx *ctx, const uint8_t key[16])
{
-uint32_t t0,t1,t2,t3;
-
- t0 = LE_READ_UINT32(key);
- t1 = LE_READ_UINT32(key+4);
- t2 = LE_READ_UINT32(key+8);
- t3 = LE_READ_UINT32(key+12);
-
- ctx->r0 = t0 & 0x3ffffff; t0 >>= 26; t0 |= t1 << 6;
- ctx->r1 = t0 & 0x3ffff03; t1 >>= 20; t1 |= t2 << 12;
- ctx->r2 = t1 & 0x3ffc0ff; t2 >>= 14; t2 |= t3 << 18;
- ctx->r3 = t2 & 0x3f03fff; t3 >>= 8;
- ctx->r4 = t3 & 0x00fffff;
-
- ctx->s1 = ctx->r1 * 5;
- ctx->s2 = ctx->r2 * 5;
- ctx->s3 = ctx->r3 * 5;
- ctx->s4 = ctx->r4 * 5;
-
- ctx->h0 = 0;
- ctx->h1 = 0;
- ctx->h2 = 0;
- ctx->h3 = 0;
- ctx->h4 = 0;
+ uint32_t t0,t1,t2,t3;
+
+ t0 = LE_READ_UINT32(key);
+ t1 = LE_READ_UINT32(key+4);
+ t2 = LE_READ_UINT32(key+8);
+ t3 = LE_READ_UINT32(key+12);
+
+ ctx->r0 = t0 & 0x3ffffff; t0 >>= 26; t0 |= t1 << 6;
+ ctx->r1 = t0 & 0x3ffff03; t1 >>= 20; t1 |= t2 << 12;
+ ctx->r2 = t1 & 0x3ffc0ff; t2 >>= 14; t2 |= t3 << 18;
+ ctx->r3 = t2 & 0x3f03fff; t3 >>= 8;
+ ctx->r4 = t3 & 0x00fffff;
+
+ ctx->s1 = ctx->r1 * 5;
+ ctx->s2 = ctx->r2 * 5;
+ ctx->s3 = ctx->r3 * 5;
+ ctx->s4 = ctx->r4 * 5;
+
+ ctx->h0 = 0;
+ ctx->h1 = 0;
+ ctx->h2 = 0;
+ ctx->h3 = 0;
+ ctx->h4 = 0;
}
void
void
poly1305_block (struct poly1305_ctx *ctx, const uint8_t m[16])
{
- uint32_t t0,t1,t2,t3;
- uint32_t b;
- uint64_t t[5];
- uint64_t c;
-
- /* full blocks */
- t0 = LE_READ_UINT32(m);
- t1 = LE_READ_UINT32(m+4);
- t2 = LE_READ_UINT32(m+8);
- t3 = LE_READ_UINT32(m+12);
-
- ctx->h0 += t0 & 0x3ffffff;
- ctx->h1 += ((((uint64_t)t1 << 32) | t0) >> 26) & 0x3ffffff;
- ctx->h2 += ((((uint64_t)t2 << 32) | t1) >> 20) & 0x3ffffff;
- ctx->h3 += ((((uint64_t)t3 << 32) | t2) >> 14) & 0x3ffffff;
- ctx->h4 += (t3 >> 8) | (1 << 24);
-
-/* poly1305_donna_mul: */
- t[0] = mul32x32_64(ctx->h0,ctx->r0) + mul32x32_64(ctx->h1,ctx->s4) + mul32x32_64(ctx->h2,ctx->s3) + mul32x32_64(ctx->h3,ctx->s2) + mul32x32_64(ctx->h4,ctx->s1);
- t[1] = mul32x32_64(ctx->h0,ctx->r1) + mul32x32_64(ctx->h1,ctx->r0) + mul32x32_64(ctx->h2,ctx->s4) + mul32x32_64(ctx->h3,ctx->s3) + mul32x32_64(ctx->h4,ctx->s2);
- t[2] = mul32x32_64(ctx->h0,ctx->r2) + mul32x32_64(ctx->h1,ctx->r1) + mul32x32_64(ctx->h2,ctx->r0) + mul32x32_64(ctx->h3,ctx->s4) + mul32x32_64(ctx->h4,ctx->s3);
- t[3] = mul32x32_64(ctx->h0,ctx->r3) + mul32x32_64(ctx->h1,ctx->r2) + mul32x32_64(ctx->h2,ctx->r1) + mul32x32_64(ctx->h3,ctx->r0) + mul32x32_64(ctx->h4,ctx->s4);
- t[4] = mul32x32_64(ctx->h0,ctx->r4) + mul32x32_64(ctx->h1,ctx->r3) + mul32x32_64(ctx->h2,ctx->r2) + mul32x32_64(ctx->h3,ctx->r1) + mul32x32_64(ctx->h4,ctx->r0);
-
- ctx->h0 = (uint32_t)t[0] & 0x3ffffff; c = (t[0] >> 26);
- t[1] += c; ctx->h1 = (uint32_t)t[1] & 0x3ffffff; b = (uint32_t)(t[1] >> 26);
- t[2] += b; ctx->h2 = (uint32_t)t[2] & 0x3ffffff; b = (uint32_t)(t[2] >> 26);
- t[3] += b; ctx->h3 = (uint32_t)t[3] & 0x3ffffff; b = (uint32_t)(t[3] >> 26);
- t[4] += b; ctx->h4 = (uint32_t)t[4] & 0x3ffffff; b = (uint32_t)(t[4] >> 26);
- ctx->h0 += b * 5;
+ uint32_t t0,t1,t2,t3;
+ uint32_t b;
+ uint64_t t[5];
+ uint64_t c;
+
+ /* full blocks */
+ t0 = LE_READ_UINT32(m);
+ t1 = LE_READ_UINT32(m+4);
+ t2 = LE_READ_UINT32(m+8);
+ t3 = LE_READ_UINT32(m+12);
+
+ ctx->h0 += t0 & 0x3ffffff;
+ ctx->h1 += ((((uint64_t)t1 << 32) | t0) >> 26) & 0x3ffffff;
+ ctx->h2 += ((((uint64_t)t2 << 32) | t1) >> 20) & 0x3ffffff;
+ ctx->h3 += ((((uint64_t)t3 << 32) | t2) >> 14) & 0x3ffffff;
+ ctx->h4 += (t3 >> 8) | (1 << 24);
+
+ /* poly1305_donna_mul: */
+ t[0] = mul32x32_64(ctx->h0,ctx->r0) + mul32x32_64(ctx->h1,ctx->s4) + mul32x32_64(ctx->h2,ctx->s3) + mul32x32_64(ctx->h3,ctx->s2) + mul32x32_64(ctx->h4,ctx->s1);
+ t[1] = mul32x32_64(ctx->h0,ctx->r1) + mul32x32_64(ctx->h1,ctx->r0) + mul32x32_64(ctx->h2,ctx->s4) + mul32x32_64(ctx->h3,ctx->s3) + mul32x32_64(ctx->h4,ctx->s2);
+ t[2] = mul32x32_64(ctx->h0,ctx->r2) + mul32x32_64(ctx->h1,ctx->r1) + mul32x32_64(ctx->h2,ctx->r0) + mul32x32_64(ctx->h3,ctx->s4) + mul32x32_64(ctx->h4,ctx->s3);
+ t[3] = mul32x32_64(ctx->h0,ctx->r3) + mul32x32_64(ctx->h1,ctx->r2) + mul32x32_64(ctx->h2,ctx->r1) + mul32x32_64(ctx->h3,ctx->r0) + mul32x32_64(ctx->h4,ctx->s4);
+ t[4] = mul32x32_64(ctx->h0,ctx->r4) + mul32x32_64(ctx->h1,ctx->r3) + mul32x32_64(ctx->h2,ctx->r2) + mul32x32_64(ctx->h3,ctx->r1) + mul32x32_64(ctx->h4,ctx->r0);
+
+ ctx->h0 = (uint32_t)t[0] & 0x3ffffff; c = (t[0] >> 26);
+ t[1] += c; ctx->h1 = (uint32_t)t[1] & 0x3ffffff; b = (uint32_t)(t[1] >> 26);
+ t[2] += b; ctx->h2 = (uint32_t)t[2] & 0x3ffffff; b = (uint32_t)(t[2] >> 26);
+ t[3] += b; ctx->h3 = (uint32_t)t[3] & 0x3ffffff; b = (uint32_t)(t[3] >> 26);
+ t[4] += b; ctx->h4 = (uint32_t)t[4] & 0x3ffffff; b = (uint32_t)(t[4] >> 26);
+ ctx->h0 += b * 5;
}
void
poly1305_digest (struct poly1305_ctx *ctx,
size_t length, uint8_t *digest)
{
- uint32_t t0,t1,t2,t3;
- uint32_t b, nb;
- size_t j;
- uint64_t t[5];
- uint64_t f0,f1,f2,f3;
- uint32_t g0,g1,g2,g3,g4;
- uint64_t c;
- uint8_t mp[16];
- uint8_t td[16];
-
- /* final bytes */
-/* poly1305_donna_atmost15bytes: */
- if (!ctx->index) goto poly1305_donna_finish;
-
- for (j = 0; j < ctx->index; j++) mp[j] = ctx->block[j];
- mp[j++] = 1;
- for (; j < 16; j++) mp[j] = 0;
-
- t0 = LE_READ_UINT32(mp);
- t1 = LE_READ_UINT32(mp+4);
- t2 = LE_READ_UINT32(mp+8);
- t3 = LE_READ_UINT32(mp+12);
-
- ctx->h0 += t0 & 0x3ffffff;
- ctx->h1 += ((((uint64_t)t1 << 32) | t0) >> 26) & 0x3ffffff;
- ctx->h2 += ((((uint64_t)t2 << 32) | t1) >> 20) & 0x3ffffff;
- ctx->h3 += ((((uint64_t)t3 << 32) | t2) >> 14) & 0x3ffffff;
- ctx->h4 += (t3 >> 8);
-
-/* poly1305_donna_mul: */
- t[0] = mul32x32_64(ctx->h0,ctx->r0) + mul32x32_64(ctx->h1,ctx->s4) + mul32x32_64(ctx->h2,ctx->s3) + mul32x32_64(ctx->h3,ctx->s2) + mul32x32_64(ctx->h4,ctx->s1);
- t[1] = mul32x32_64(ctx->h0,ctx->r1) + mul32x32_64(ctx->h1,ctx->r0) + mul32x32_64(ctx->h2,ctx->s4) + mul32x32_64(ctx->h3,ctx->s3) + mul32x32_64(ctx->h4,ctx->s2);
- t[2] = mul32x32_64(ctx->h0,ctx->r2) + mul32x32_64(ctx->h1,ctx->r1) + mul32x32_64(ctx->h2,ctx->r0) + mul32x32_64(ctx->h3,ctx->s4) + mul32x32_64(ctx->h4,ctx->s3);
- t[3] = mul32x32_64(ctx->h0,ctx->r3) + mul32x32_64(ctx->h1,ctx->r2) + mul32x32_64(ctx->h2,ctx->r1) + mul32x32_64(ctx->h3,ctx->r0) + mul32x32_64(ctx->h4,ctx->s4);
- t[4] = mul32x32_64(ctx->h0,ctx->r4) + mul32x32_64(ctx->h1,ctx->r3) + mul32x32_64(ctx->h2,ctx->r2) + mul32x32_64(ctx->h3,ctx->r1) + mul32x32_64(ctx->h4,ctx->r0);
-
- ctx->h0 = (uint32_t)t[0] & 0x3ffffff; c = (t[0] >> 26);
- t[1] += c; ctx->h1 = (uint32_t)t[1] & 0x3ffffff; b = (uint32_t)(t[1] >> 26);
- t[2] += b; ctx->h2 = (uint32_t)t[2] & 0x3ffffff; b = (uint32_t)(t[2] >> 26);
- t[3] += b; ctx->h3 = (uint32_t)t[3] & 0x3ffffff; b = (uint32_t)(t[3] >> 26);
- t[4] += b; ctx->h4 = (uint32_t)t[4] & 0x3ffffff; b = (uint32_t)(t[4] >> 26);
- ctx->h0 += b * 5;
-
-poly1305_donna_finish:
- b = ctx->h0 >> 26; ctx->h0 = ctx->h0 & 0x3ffffff;
- ctx->h1 += b; b = ctx->h1 >> 26; ctx->h1 = ctx->h1 & 0x3ffffff;
- ctx->h2 += b; b = ctx->h2 >> 26; ctx->h2 = ctx->h2 & 0x3ffffff;
- ctx->h3 += b; b = ctx->h3 >> 26; ctx->h3 = ctx->h3 & 0x3ffffff;
- ctx->h4 += b; b = ctx->h4 >> 26; ctx->h4 = ctx->h4 & 0x3ffffff;
- ctx->h0 += b * 5; b = ctx->h0 >> 26; ctx->h0 = ctx->h0 & 0x3ffffff;
- ctx->h1 += b;
-
- g0 = ctx->h0 + 5; b = g0 >> 26; g0 &= 0x3ffffff;
- g1 = ctx->h1 + b; b = g1 >> 26; g1 &= 0x3ffffff;
- g2 = ctx->h2 + b; b = g2 >> 26; g2 &= 0x3ffffff;
- g3 = ctx->h3 + b; b = g3 >> 26; g3 &= 0x3ffffff;
- g4 = ctx->h4 + b - (1 << 26);
-
- b = (g4 >> 31) - 1;
- nb = ~b;
- ctx->h0 = (ctx->h0 & nb) | (g0 & b);
- ctx->h1 = (ctx->h1 & nb) | (g1 & b);
- ctx->h2 = (ctx->h2 & nb) | (g2 & b);
- ctx->h3 = (ctx->h3 & nb) | (g3 & b);
- ctx->h4 = (ctx->h4 & nb) | (g4 & b);
-
- f0 = ((ctx->h0 ) | (ctx->h1 << 26)) + (uint64_t)LE_READ_UINT32(ctx->s);
- f1 = ((ctx->h1 >> 6) | (ctx->h2 << 20)) + (uint64_t)LE_READ_UINT32(ctx->s+4);
- f2 = ((ctx->h2 >> 12) | (ctx->h3 << 14)) + (uint64_t)LE_READ_UINT32(ctx->s+8);
- f3 = ((ctx->h3 >> 18) | (ctx->h4 << 8)) + (uint64_t)LE_READ_UINT32(ctx->s+12);
-
- LE_WRITE_UINT32(td, f0);
- f1 += (f0 >> 32);
- LE_WRITE_UINT32(&td[4], f1);
- f2 += (f1 >> 32);
- LE_WRITE_UINT32(&td[8], f2);
- f3 += (f2 >> 32);
- LE_WRITE_UINT32(&td[12], f3);
-
- memcpy(digest, td, length);
+ uint32_t t0,t1,t2,t3;
+ uint32_t b, nb;
+ size_t j;
+ uint64_t t[5];
+ uint64_t f0,f1,f2,f3;
+ uint32_t g0,g1,g2,g3,g4;
+ uint64_t c;
+ uint8_t mp[16];
+ uint8_t td[16];
+
+ /* final bytes */
+ /* poly1305_donna_atmost15bytes: */
+ if (!ctx->index) goto poly1305_donna_finish;
+
+ for (j = 0; j < ctx->index; j++) mp[j] = ctx->block[j];
+ mp[j++] = 1;
+ for (; j < 16; j++) mp[j] = 0;
+
+ t0 = LE_READ_UINT32(mp);
+ t1 = LE_READ_UINT32(mp+4);
+ t2 = LE_READ_UINT32(mp+8);
+ t3 = LE_READ_UINT32(mp+12);
+
+ ctx->h0 += t0 & 0x3ffffff;
+ ctx->h1 += ((((uint64_t)t1 << 32) | t0) >> 26) & 0x3ffffff;
+ ctx->h2 += ((((uint64_t)t2 << 32) | t1) >> 20) & 0x3ffffff;
+ ctx->h3 += ((((uint64_t)t3 << 32) | t2) >> 14) & 0x3ffffff;
+ ctx->h4 += (t3 >> 8);
+
+ /* poly1305_donna_mul: */
+ t[0] = mul32x32_64(ctx->h0,ctx->r0) + mul32x32_64(ctx->h1,ctx->s4) + mul32x32_64(ctx->h2,ctx->s3) + mul32x32_64(ctx->h3,ctx->s2) + mul32x32_64(ctx->h4,ctx->s1);
+ t[1] = mul32x32_64(ctx->h0,ctx->r1) + mul32x32_64(ctx->h1,ctx->r0) + mul32x32_64(ctx->h2,ctx->s4) + mul32x32_64(ctx->h3,ctx->s3) + mul32x32_64(ctx->h4,ctx->s2);
+ t[2] = mul32x32_64(ctx->h0,ctx->r2) + mul32x32_64(ctx->h1,ctx->r1) + mul32x32_64(ctx->h2,ctx->r0) + mul32x32_64(ctx->h3,ctx->s4) + mul32x32_64(ctx->h4,ctx->s3);
+ t[3] = mul32x32_64(ctx->h0,ctx->r3) + mul32x32_64(ctx->h1,ctx->r2) + mul32x32_64(ctx->h2,ctx->r1) + mul32x32_64(ctx->h3,ctx->r0) + mul32x32_64(ctx->h4,ctx->s4);
+ t[4] = mul32x32_64(ctx->h0,ctx->r4) + mul32x32_64(ctx->h1,ctx->r3) + mul32x32_64(ctx->h2,ctx->r2) + mul32x32_64(ctx->h3,ctx->r1) + mul32x32_64(ctx->h4,ctx->r0);
+
+ ctx->h0 = (uint32_t)t[0] & 0x3ffffff; c = (t[0] >> 26);
+ t[1] += c; ctx->h1 = (uint32_t)t[1] & 0x3ffffff; b = (uint32_t)(t[1] >> 26);
+ t[2] += b; ctx->h2 = (uint32_t)t[2] & 0x3ffffff; b = (uint32_t)(t[2] >> 26);
+ t[3] += b; ctx->h3 = (uint32_t)t[3] & 0x3ffffff; b = (uint32_t)(t[3] >> 26);
+ t[4] += b; ctx->h4 = (uint32_t)t[4] & 0x3ffffff; b = (uint32_t)(t[4] >> 26);
+ ctx->h0 += b * 5;
+
+ poly1305_donna_finish:
+ b = ctx->h0 >> 26; ctx->h0 = ctx->h0 & 0x3ffffff;
+ ctx->h1 += b; b = ctx->h1 >> 26; ctx->h1 = ctx->h1 & 0x3ffffff;
+ ctx->h2 += b; b = ctx->h2 >> 26; ctx->h2 = ctx->h2 & 0x3ffffff;
+ ctx->h3 += b; b = ctx->h3 >> 26; ctx->h3 = ctx->h3 & 0x3ffffff;
+ ctx->h4 += b; b = ctx->h4 >> 26; ctx->h4 = ctx->h4 & 0x3ffffff;
+ ctx->h0 += b * 5; b = ctx->h0 >> 26; ctx->h0 = ctx->h0 & 0x3ffffff;
+ ctx->h1 += b;
+
+ g0 = ctx->h0 + 5; b = g0 >> 26; g0 &= 0x3ffffff;
+ g1 = ctx->h1 + b; b = g1 >> 26; g1 &= 0x3ffffff;
+ g2 = ctx->h2 + b; b = g2 >> 26; g2 &= 0x3ffffff;
+ g3 = ctx->h3 + b; b = g3 >> 26; g3 &= 0x3ffffff;
+ g4 = ctx->h4 + b - (1 << 26);
+
+ b = (g4 >> 31) - 1;
+ nb = ~b;
+ ctx->h0 = (ctx->h0 & nb) | (g0 & b);
+ ctx->h1 = (ctx->h1 & nb) | (g1 & b);
+ ctx->h2 = (ctx->h2 & nb) | (g2 & b);
+ ctx->h3 = (ctx->h3 & nb) | (g3 & b);
+ ctx->h4 = (ctx->h4 & nb) | (g4 & b);
+
+ f0 = ((ctx->h0 ) | (ctx->h1 << 26)) + (uint64_t)LE_READ_UINT32(ctx->s);
+ f1 = ((ctx->h1 >> 6) | (ctx->h2 << 20)) + (uint64_t)LE_READ_UINT32(ctx->s+4);
+ f2 = ((ctx->h2 >> 12) | (ctx->h3 << 14)) + (uint64_t)LE_READ_UINT32(ctx->s+8);
+ f3 = ((ctx->h3 >> 18) | (ctx->h4 << 8)) + (uint64_t)LE_READ_UINT32(ctx->s+12);
+
+ LE_WRITE_UINT32(td, f0);
+ f1 += (f0 >> 32);
+ LE_WRITE_UINT32(&td[4], f1);
+ f2 += (f1 >> 32);
+ LE_WRITE_UINT32(&td[8], f2);
+ f3 += (f2 >> 32);
+ LE_WRITE_UINT32(&td[12], f3);
+
+ memcpy(digest, td, length);
}
projects / thirdparty / nettle.git / commitdiff
