diff options
Diffstat (limited to 'poly1305.c')
-rw-r--r-- | poly1305.c | 153 |
1 files changed, 1 insertions, 152 deletions
@@ -31,38 +31,8 @@ #endif #include <string.h> -#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; -} +#include "poly1305.h" void poly1305_set_nonce (struct poly1305_ctx *ctx, const uint8_t * nonce) @@ -75,124 +45,3 @@ poly1305_set_s (struct poly1305_ctx *ctx, const uint8_t * s) { memcpy (ctx->s, s, 16); } - -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; -} - -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); -} |