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/* MIT License
*
* Copyright (c) 2016-2022 INRIA, CMU and Microsoft Corporation
* Copyright (c) 2022-2023 HACL* Contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "Hacl_Chacha20Poly1305_32.h"
#include "internal/Hacl_Krmllib.h"
static inline void
poly1305_padded_32(uint64_t *ctx, uint32_t len, uint8_t *text)
{
uint32_t n = len / (uint32_t)16U;
uint32_t r = len % (uint32_t)16U;
uint8_t *blocks = text;
uint8_t *rem = text + n * (uint32_t)16U;
uint64_t *pre0 = ctx + (uint32_t)5U;
uint64_t *acc0 = ctx;
uint32_t nb = n * (uint32_t)16U / (uint32_t)16U;
uint32_t rem1 = n * (uint32_t)16U % (uint32_t)16U;
for (uint32_t i = (uint32_t)0U; i < nb; i++) {
uint8_t *block = blocks + i * (uint32_t)16U;
uint64_t e[5U] = { 0U };
uint64_t u0 = load64_le(block);
uint64_t lo = u0;
uint64_t u = load64_le(block + (uint32_t)8U);
uint64_t hi = u;
uint64_t f0 = lo;
uint64_t f1 = hi;
uint64_t f010 = f0 & (uint64_t)0x3ffffffU;
uint64_t f110 = f0 >> (uint32_t)26U & (uint64_t)0x3ffffffU;
uint64_t f20 = f0 >> (uint32_t)52U | (f1 & (uint64_t)0x3fffU) << (uint32_t)12U;
uint64_t f30 = f1 >> (uint32_t)14U & (uint64_t)0x3ffffffU;
uint64_t f40 = f1 >> (uint32_t)40U;
uint64_t f01 = f010;
uint64_t f111 = f110;
uint64_t f2 = f20;
uint64_t f3 = f30;
uint64_t f41 = f40;
e[0U] = f01;
e[1U] = f111;
e[2U] = f2;
e[3U] = f3;
e[4U] = f41;
uint64_t b = (uint64_t)0x1000000U;
uint64_t mask = b;
uint64_t f4 = e[4U];
e[4U] = f4 | mask;
uint64_t *r1 = pre0;
uint64_t *r5 = pre0 + (uint32_t)5U;
uint64_t r0 = r1[0U];
uint64_t r11 = r1[1U];
uint64_t r2 = r1[2U];
uint64_t r3 = r1[3U];
uint64_t r4 = r1[4U];
uint64_t r51 = r5[1U];
uint64_t r52 = r5[2U];
uint64_t r53 = r5[3U];
uint64_t r54 = r5[4U];
uint64_t f10 = e[0U];
uint64_t f11 = e[1U];
uint64_t f12 = e[2U];
uint64_t f13 = e[3U];
uint64_t f14 = e[4U];
uint64_t a0 = acc0[0U];
uint64_t a1 = acc0[1U];
uint64_t a2 = acc0[2U];
uint64_t a3 = acc0[3U];
uint64_t a4 = acc0[4U];
uint64_t a01 = a0 + f10;
uint64_t a11 = a1 + f11;
uint64_t a21 = a2 + f12;
uint64_t a31 = a3 + f13;
uint64_t a41 = a4 + f14;
uint64_t a02 = r0 * a01;
uint64_t a12 = r11 * a01;
uint64_t a22 = r2 * a01;
uint64_t a32 = r3 * a01;
uint64_t a42 = r4 * a01;
uint64_t a03 = a02 + r54 * a11;
uint64_t a13 = a12 + r0 * a11;
uint64_t a23 = a22 + r11 * a11;
uint64_t a33 = a32 + r2 * a11;
uint64_t a43 = a42 + r3 * a11;
uint64_t a04 = a03 + r53 * a21;
uint64_t a14 = a13 + r54 * a21;
uint64_t a24 = a23 + r0 * a21;
uint64_t a34 = a33 + r11 * a21;
uint64_t a44 = a43 + r2 * a21;
uint64_t a05 = a04 + r52 * a31;
uint64_t a15 = a14 + r53 * a31;
uint64_t a25 = a24 + r54 * a31;
uint64_t a35 = a34 + r0 * a31;
uint64_t a45 = a44 + r11 * a31;
uint64_t a06 = a05 + r51 * a41;
uint64_t a16 = a15 + r52 * a41;
uint64_t a26 = a25 + r53 * a41;
uint64_t a36 = a35 + r54 * a41;
uint64_t a46 = a45 + r0 * a41;
uint64_t t0 = a06;
uint64_t t1 = a16;
uint64_t t2 = a26;
uint64_t t3 = a36;
uint64_t t4 = a46;
uint64_t mask26 = (uint64_t)0x3ffffffU;
uint64_t z0 = t0 >> (uint32_t)26U;
uint64_t z1 = t3 >> (uint32_t)26U;
uint64_t x0 = t0 & mask26;
uint64_t x3 = t3 & mask26;
uint64_t x1 = t1 + z0;
uint64_t x4 = t4 + z1;
uint64_t z01 = x1 >> (uint32_t)26U;
uint64_t z11 = x4 >> (uint32_t)26U;
uint64_t t = z11 << (uint32_t)2U;
uint64_t z12 = z11 + t;
uint64_t x11 = x1 & mask26;
uint64_t x41 = x4 & mask26;
uint64_t x2 = t2 + z01;
uint64_t x01 = x0 + z12;
uint64_t z02 = x2 >> (uint32_t)26U;
uint64_t z13 = x01 >> (uint32_t)26U;
uint64_t x21 = x2 & mask26;
uint64_t x02 = x01 & mask26;
uint64_t x31 = x3 + z02;
uint64_t x12 = x11 + z13;
uint64_t z03 = x31 >> (uint32_t)26U;
uint64_t x32 = x31 & mask26;
uint64_t x42 = x41 + z03;
uint64_t o0 = x02;
uint64_t o1 = x12;
uint64_t o2 = x21;
uint64_t o3 = x32;
uint64_t o4 = x42;
acc0[0U] = o0;
acc0[1U] = o1;
acc0[2U] = o2;
acc0[3U] = o3;
acc0[4U] = o4;
}
if (rem1 > (uint32_t)0U) {
uint8_t *last = blocks + nb * (uint32_t)16U;
uint64_t e[5U] = { 0U };
uint8_t tmp[16U] = { 0U };
memcpy(tmp, last, rem1 * sizeof(uint8_t));
uint64_t u0 = load64_le(tmp);
uint64_t lo = u0;
uint64_t u = load64_le(tmp + (uint32_t)8U);
uint64_t hi = u;
uint64_t f0 = lo;
uint64_t f1 = hi;
uint64_t f010 = f0 & (uint64_t)0x3ffffffU;
uint64_t f110 = f0 >> (uint32_t)26U & (uint64_t)0x3ffffffU;
uint64_t f20 = f0 >> (uint32_t)52U | (f1 & (uint64_t)0x3fffU) << (uint32_t)12U;
uint64_t f30 = f1 >> (uint32_t)14U & (uint64_t)0x3ffffffU;
uint64_t f40 = f1 >> (uint32_t)40U;
uint64_t f01 = f010;
uint64_t f111 = f110;
uint64_t f2 = f20;
uint64_t f3 = f30;
uint64_t f4 = f40;
e[0U] = f01;
e[1U] = f111;
e[2U] = f2;
e[3U] = f3;
e[4U] = f4;
uint64_t b = (uint64_t)1U << rem1 * (uint32_t)8U % (uint32_t)26U;
uint64_t mask = b;
uint64_t fi = e[rem1 * (uint32_t)8U / (uint32_t)26U];
e[rem1 * (uint32_t)8U / (uint32_t)26U] = fi | mask;
uint64_t *r1 = pre0;
uint64_t *r5 = pre0 + (uint32_t)5U;
uint64_t r0 = r1[0U];
uint64_t r11 = r1[1U];
uint64_t r2 = r1[2U];
uint64_t r3 = r1[3U];
uint64_t r4 = r1[4U];
uint64_t r51 = r5[1U];
uint64_t r52 = r5[2U];
uint64_t r53 = r5[3U];
uint64_t r54 = r5[4U];
uint64_t f10 = e[0U];
uint64_t f11 = e[1U];
uint64_t f12 = e[2U];
uint64_t f13 = e[3U];
uint64_t f14 = e[4U];
uint64_t a0 = acc0[0U];
uint64_t a1 = acc0[1U];
uint64_t a2 = acc0[2U];
uint64_t a3 = acc0[3U];
uint64_t a4 = acc0[4U];
uint64_t a01 = a0 + f10;
uint64_t a11 = a1 + f11;
uint64_t a21 = a2 + f12;
uint64_t a31 = a3 + f13;
uint64_t a41 = a4 + f14;
uint64_t a02 = r0 * a01;
uint64_t a12 = r11 * a01;
uint64_t a22 = r2 * a01;
uint64_t a32 = r3 * a01;
uint64_t a42 = r4 * a01;
uint64_t a03 = a02 + r54 * a11;
uint64_t a13 = a12 + r0 * a11;
uint64_t a23 = a22 + r11 * a11;
uint64_t a33 = a32 + r2 * a11;
uint64_t a43 = a42 + r3 * a11;
uint64_t a04 = a03 + r53 * a21;
uint64_t a14 = a13 + r54 * a21;
uint64_t a24 = a23 + r0 * a21;
uint64_t a34 = a33 + r11 * a21;
uint64_t a44 = a43 + r2 * a21;
uint64_t a05 = a04 + r52 * a31;
uint64_t a15 = a14 + r53 * a31;
uint64_t a25 = a24 + r54 * a31;
uint64_t a35 = a34 + r0 * a31;
uint64_t a45 = a44 + r11 * a31;
uint64_t a06 = a05 + r51 * a41;
uint64_t a16 = a15 + r52 * a41;
uint64_t a26 = a25 + r53 * a41;
uint64_t a36 = a35 + r54 * a41;
uint64_t a46 = a45 + r0 * a41;
uint64_t t0 = a06;
uint64_t t1 = a16;
uint64_t t2 = a26;
uint64_t t3 = a36;
uint64_t t4 = a46;
uint64_t mask26 = (uint64_t)0x3ffffffU;
uint64_t z0 = t0 >> (uint32_t)26U;
uint64_t z1 = t3 >> (uint32_t)26U;
uint64_t x0 = t0 & mask26;
uint64_t x3 = t3 & mask26;
uint64_t x1 = t1 + z0;
uint64_t x4 = t4 + z1;
uint64_t z01 = x1 >> (uint32_t)26U;
uint64_t z11 = x4 >> (uint32_t)26U;
uint64_t t = z11 << (uint32_t)2U;
uint64_t z12 = z11 + t;
uint64_t x11 = x1 & mask26;
uint64_t x41 = x4 & mask26;
uint64_t x2 = t2 + z01;
uint64_t x01 = x0 + z12;
uint64_t z02 = x2 >> (uint32_t)26U;
uint64_t z13 = x01 >> (uint32_t)26U;
uint64_t x21 = x2 & mask26;
uint64_t x02 = x01 & mask26;
uint64_t x31 = x3 + z02;
uint64_t x12 = x11 + z13;
uint64_t z03 = x31 >> (uint32_t)26U;
uint64_t x32 = x31 & mask26;
uint64_t x42 = x41 + z03;
uint64_t o0 = x02;
uint64_t o1 = x12;
uint64_t o2 = x21;
uint64_t o3 = x32;
uint64_t o4 = x42;
acc0[0U] = o0;
acc0[1U] = o1;
acc0[2U] = o2;
acc0[3U] = o3;
acc0[4U] = o4;
}
uint8_t tmp[16U] = { 0U };
memcpy(tmp, rem, r * sizeof(uint8_t));
if (r > (uint32_t)0U) {
uint64_t *pre = ctx + (uint32_t)5U;
uint64_t *acc = ctx;
uint64_t e[5U] = { 0U };
uint64_t u0 = load64_le(tmp);
uint64_t lo = u0;
uint64_t u = load64_le(tmp + (uint32_t)8U);
uint64_t hi = u;
uint64_t f0 = lo;
uint64_t f1 = hi;
uint64_t f010 = f0 & (uint64_t)0x3ffffffU;
uint64_t f110 = f0 >> (uint32_t)26U & (uint64_t)0x3ffffffU;
uint64_t f20 = f0 >> (uint32_t)52U | (f1 & (uint64_t)0x3fffU) << (uint32_t)12U;
uint64_t f30 = f1 >> (uint32_t)14U & (uint64_t)0x3ffffffU;
uint64_t f40 = f1 >> (uint32_t)40U;
uint64_t f01 = f010;
uint64_t f111 = f110;
uint64_t f2 = f20;
uint64_t f3 = f30;
uint64_t f41 = f40;
e[0U] = f01;
e[1U] = f111;
e[2U] = f2;
e[3U] = f3;
e[4U] = f41;
uint64_t b = (uint64_t)0x1000000U;
uint64_t mask = b;
uint64_t f4 = e[4U];
e[4U] = f4 | mask;
uint64_t *r1 = pre;
uint64_t *r5 = pre + (uint32_t)5U;
uint64_t r0 = r1[0U];
uint64_t r11 = r1[1U];
uint64_t r2 = r1[2U];
uint64_t r3 = r1[3U];
uint64_t r4 = r1[4U];
uint64_t r51 = r5[1U];
uint64_t r52 = r5[2U];
uint64_t r53 = r5[3U];
uint64_t r54 = r5[4U];
uint64_t f10 = e[0U];
uint64_t f11 = e[1U];
uint64_t f12 = e[2U];
uint64_t f13 = e[3U];
uint64_t f14 = e[4U];
uint64_t a0 = acc[0U];
uint64_t a1 = acc[1U];
uint64_t a2 = acc[2U];
uint64_t a3 = acc[3U];
uint64_t a4 = acc[4U];
uint64_t a01 = a0 + f10;
uint64_t a11 = a1 + f11;
uint64_t a21 = a2 + f12;
uint64_t a31 = a3 + f13;
uint64_t a41 = a4 + f14;
uint64_t a02 = r0 * a01;
uint64_t a12 = r11 * a01;
uint64_t a22 = r2 * a01;
uint64_t a32 = r3 * a01;
uint64_t a42 = r4 * a01;
uint64_t a03 = a02 + r54 * a11;
uint64_t a13 = a12 + r0 * a11;
uint64_t a23 = a22 + r11 * a11;
uint64_t a33 = a32 + r2 * a11;
uint64_t a43 = a42 + r3 * a11;
uint64_t a04 = a03 + r53 * a21;
uint64_t a14 = a13 + r54 * a21;
uint64_t a24 = a23 + r0 * a21;
uint64_t a34 = a33 + r11 * a21;
uint64_t a44 = a43 + r2 * a21;
uint64_t a05 = a04 + r52 * a31;
uint64_t a15 = a14 + r53 * a31;
uint64_t a25 = a24 + r54 * a31;
uint64_t a35 = a34 + r0 * a31;
uint64_t a45 = a44 + r11 * a31;
uint64_t a06 = a05 + r51 * a41;
uint64_t a16 = a15 + r52 * a41;
uint64_t a26 = a25 + r53 * a41;
uint64_t a36 = a35 + r54 * a41;
uint64_t a46 = a45 + r0 * a41;
uint64_t t0 = a06;
uint64_t t1 = a16;
uint64_t t2 = a26;
uint64_t t3 = a36;
uint64_t t4 = a46;
uint64_t mask26 = (uint64_t)0x3ffffffU;
uint64_t z0 = t0 >> (uint32_t)26U;
uint64_t z1 = t3 >> (uint32_t)26U;
uint64_t x0 = t0 & mask26;
uint64_t x3 = t3 & mask26;
uint64_t x1 = t1 + z0;
uint64_t x4 = t4 + z1;
uint64_t z01 = x1 >> (uint32_t)26U;
uint64_t z11 = x4 >> (uint32_t)26U;
uint64_t t = z11 << (uint32_t)2U;
uint64_t z12 = z11 + t;
uint64_t x11 = x1 & mask26;
uint64_t x41 = x4 & mask26;
uint64_t x2 = t2 + z01;
uint64_t x01 = x0 + z12;
uint64_t z02 = x2 >> (uint32_t)26U;
uint64_t z13 = x01 >> (uint32_t)26U;
uint64_t x21 = x2 & mask26;
uint64_t x02 = x01 & mask26;
uint64_t x31 = x3 + z02;
uint64_t x12 = x11 + z13;
uint64_t z03 = x31 >> (uint32_t)26U;
uint64_t x32 = x31 & mask26;
uint64_t x42 = x41 + z03;
uint64_t o0 = x02;
uint64_t o1 = x12;
uint64_t o2 = x21;
uint64_t o3 = x32;
uint64_t o4 = x42;
acc[0U] = o0;
acc[1U] = o1;
acc[2U] = o2;
acc[3U] = o3;
acc[4U] = o4;
return;
}
}
static inline void
poly1305_do_32(
uint8_t *k,
uint32_t aadlen,
uint8_t *aad,
uint32_t mlen,
uint8_t *m,
uint8_t *out)
{
uint64_t ctx[25U] = { 0U };
uint8_t block[16U] = { 0U };
Hacl_Poly1305_32_poly1305_init(ctx, k);
if (aadlen != (uint32_t)0U) {
poly1305_padded_32(ctx, aadlen, aad);
}
if (mlen != (uint32_t)0U) {
poly1305_padded_32(ctx, mlen, m);
}
store64_le(block, (uint64_t)aadlen);
store64_le(block + (uint32_t)8U, (uint64_t)mlen);
uint64_t *pre = ctx + (uint32_t)5U;
uint64_t *acc = ctx;
uint64_t e[5U] = { 0U };
uint64_t u0 = load64_le(block);
uint64_t lo = u0;
uint64_t u = load64_le(block + (uint32_t)8U);
uint64_t hi = u;
uint64_t f0 = lo;
uint64_t f1 = hi;
uint64_t f010 = f0 & (uint64_t)0x3ffffffU;
uint64_t f110 = f0 >> (uint32_t)26U & (uint64_t)0x3ffffffU;
uint64_t f20 = f0 >> (uint32_t)52U | (f1 & (uint64_t)0x3fffU) << (uint32_t)12U;
uint64_t f30 = f1 >> (uint32_t)14U & (uint64_t)0x3ffffffU;
uint64_t f40 = f1 >> (uint32_t)40U;
uint64_t f01 = f010;
uint64_t f111 = f110;
uint64_t f2 = f20;
uint64_t f3 = f30;
uint64_t f41 = f40;
e[0U] = f01;
e[1U] = f111;
e[2U] = f2;
e[3U] = f3;
e[4U] = f41;
uint64_t b = (uint64_t)0x1000000U;
uint64_t mask = b;
uint64_t f4 = e[4U];
e[4U] = f4 | mask;
uint64_t *r = pre;
uint64_t *r5 = pre + (uint32_t)5U;
uint64_t r0 = r[0U];
uint64_t r1 = r[1U];
uint64_t r2 = r[2U];
uint64_t r3 = r[3U];
uint64_t r4 = r[4U];
uint64_t r51 = r5[1U];
uint64_t r52 = r5[2U];
uint64_t r53 = r5[3U];
uint64_t r54 = r5[4U];
uint64_t f10 = e[0U];
uint64_t f11 = e[1U];
uint64_t f12 = e[2U];
uint64_t f13 = e[3U];
uint64_t f14 = e[4U];
uint64_t a0 = acc[0U];
uint64_t a1 = acc[1U];
uint64_t a2 = acc[2U];
uint64_t a3 = acc[3U];
uint64_t a4 = acc[4U];
uint64_t a01 = a0 + f10;
uint64_t a11 = a1 + f11;
uint64_t a21 = a2 + f12;
uint64_t a31 = a3 + f13;
uint64_t a41 = a4 + f14;
uint64_t a02 = r0 * a01;
uint64_t a12 = r1 * a01;
uint64_t a22 = r2 * a01;
uint64_t a32 = r3 * a01;
uint64_t a42 = r4 * a01;
uint64_t a03 = a02 + r54 * a11;
uint64_t a13 = a12 + r0 * a11;
uint64_t a23 = a22 + r1 * a11;
uint64_t a33 = a32 + r2 * a11;
uint64_t a43 = a42 + r3 * a11;
uint64_t a04 = a03 + r53 * a21;
uint64_t a14 = a13 + r54 * a21;
uint64_t a24 = a23 + r0 * a21;
uint64_t a34 = a33 + r1 * a21;
uint64_t a44 = a43 + r2 * a21;
uint64_t a05 = a04 + r52 * a31;
uint64_t a15 = a14 + r53 * a31;
uint64_t a25 = a24 + r54 * a31;
uint64_t a35 = a34 + r0 * a31;
uint64_t a45 = a44 + r1 * a31;
uint64_t a06 = a05 + r51 * a41;
uint64_t a16 = a15 + r52 * a41;
uint64_t a26 = a25 + r53 * a41;
uint64_t a36 = a35 + r54 * a41;
uint64_t a46 = a45 + r0 * a41;
uint64_t t0 = a06;
uint64_t t1 = a16;
uint64_t t2 = a26;
uint64_t t3 = a36;
uint64_t t4 = a46;
uint64_t mask26 = (uint64_t)0x3ffffffU;
uint64_t z0 = t0 >> (uint32_t)26U;
uint64_t z1 = t3 >> (uint32_t)26U;
uint64_t x0 = t0 & mask26;
uint64_t x3 = t3 & mask26;
uint64_t x1 = t1 + z0;
uint64_t x4 = t4 + z1;
uint64_t z01 = x1 >> (uint32_t)26U;
uint64_t z11 = x4 >> (uint32_t)26U;
uint64_t t = z11 << (uint32_t)2U;
uint64_t z12 = z11 + t;
uint64_t x11 = x1 & mask26;
uint64_t x41 = x4 & mask26;
uint64_t x2 = t2 + z01;
uint64_t x01 = x0 + z12;
uint64_t z02 = x2 >> (uint32_t)26U;
uint64_t z13 = x01 >> (uint32_t)26U;
uint64_t x21 = x2 & mask26;
uint64_t x02 = x01 & mask26;
uint64_t x31 = x3 + z02;
uint64_t x12 = x11 + z13;
uint64_t z03 = x31 >> (uint32_t)26U;
uint64_t x32 = x31 & mask26;
uint64_t x42 = x41 + z03;
uint64_t o0 = x02;
uint64_t o1 = x12;
uint64_t o2 = x21;
uint64_t o3 = x32;
uint64_t o4 = x42;
acc[0U] = o0;
acc[1U] = o1;
acc[2U] = o2;
acc[3U] = o3;
acc[4U] = o4;
Hacl_Poly1305_32_poly1305_finish(out, k, ctx);
}
/**
Encrypt a message `m` with key `k`.
The arguments `k`, `n`, `aadlen`, and `aad` are same in encryption/decryption.
Note: Encryption and decryption can be executed in-place, i.e., `m` and `cipher` can point to the same memory.
@param k Pointer to 32 bytes of memory where the AEAD key is read from.
@param n Pointer to 12 bytes of memory where the AEAD nonce is read from.
@param aadlen Length of the associated data.
@param aad Pointer to `aadlen` bytes of memory where the associated data is read from.
@param mlen Length of the message.
@param m Pointer to `mlen` bytes of memory where the message is read from.
@param cipher Pointer to `mlen` bytes of memory where the ciphertext is written to.
@param mac Pointer to 16 bytes of memory where the mac is written to.
*/
void
Hacl_Chacha20Poly1305_32_aead_encrypt(
uint8_t *k,
uint8_t *n,
uint32_t aadlen,
uint8_t *aad,
uint32_t mlen,
uint8_t *m,
uint8_t *cipher,
uint8_t *mac)
{
Hacl_Chacha20_chacha20_encrypt(mlen, cipher, m, k, n, (uint32_t)1U);
uint8_t tmp[64U] = { 0U };
Hacl_Chacha20_chacha20_encrypt((uint32_t)64U, tmp, tmp, k, n, (uint32_t)0U);
uint8_t *key = tmp;
poly1305_do_32(key, aadlen, aad, mlen, cipher, mac);
}
/**
Decrypt a ciphertext `cipher` with key `k`.
The arguments `k`, `n`, `aadlen`, and `aad` are same in encryption/decryption.
Note: Encryption and decryption can be executed in-place, i.e., `m` and `cipher` can point to the same memory.
If decryption succeeds, the resulting plaintext is stored in `m` and the function returns the success code 0.
If decryption fails, the array `m` remains unchanged and the function returns the error code 1.
@param k Pointer to 32 bytes of memory where the AEAD key is read from.
@param n Pointer to 12 bytes of memory where the AEAD nonce is read from.
@param aadlen Length of the associated data.
@param aad Pointer to `aadlen` bytes of memory where the associated data is read from.
@param mlen Length of the ciphertext.
@param m Pointer to `mlen` bytes of memory where the message is written to.
@param cipher Pointer to `mlen` bytes of memory where the ciphertext is read from.
@param mac Pointer to 16 bytes of memory where the mac is read from.
@returns 0 on succeess; 1 on failure.
*/
uint32_t
Hacl_Chacha20Poly1305_32_aead_decrypt(
uint8_t *k,
uint8_t *n,
uint32_t aadlen,
uint8_t *aad,
uint32_t mlen,
uint8_t *m,
uint8_t *cipher,
uint8_t *mac)
{
uint8_t computed_mac[16U] = { 0U };
uint8_t tmp[64U] = { 0U };
Hacl_Chacha20_chacha20_encrypt((uint32_t)64U, tmp, tmp, k, n, (uint32_t)0U);
uint8_t *key = tmp;
poly1305_do_32(key, aadlen, aad, mlen, cipher, computed_mac);
uint8_t res = (uint8_t)255U;
KRML_MAYBE_FOR16(i,
(uint32_t)0U,
(uint32_t)16U,
(uint32_t)1U,
uint8_t uu____0 = FStar_UInt8_eq_mask(computed_mac[i], mac[i]);
res = uu____0 & res;);
uint8_t z = res;
if (z == (uint8_t)255U) {
Hacl_Chacha20_chacha20_encrypt(mlen, m, cipher, k, n, (uint32_t)1U);
return (uint32_t)0U;
}
return (uint32_t)1U;
}