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289 lines
8.6 KiB
289 lines
8.6 KiB
#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include "core.h"
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#include "crypto_aead_aegis256.h"
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#include "crypto_verify_16.h"
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#include "export.h"
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#include "randombytes.h"
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#include "runtime.h"
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#include "utils.h"
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#include "private/common.h"
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#ifdef HAVE_ARMCRYPTO
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# include <arm_neon.h>
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static inline void
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crypto_aead_aegis256_update(uint8x16_t *const state, const uint8x16_t data)
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{
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const uint8x16_t zero = vmovq_n_u8(0);
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uint8x16_t tmp;
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tmp = veorq_u8(vaesmcq_u8(vaeseq_u8(state[5], zero)), state[0]);
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state[5] = veorq_u8(vaesmcq_u8(vaeseq_u8(state[4], zero)), state[5]);
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state[4] = veorq_u8(vaesmcq_u8(vaeseq_u8(state[3], zero)), state[4]);
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state[3] = veorq_u8(vaesmcq_u8(vaeseq_u8(state[2], zero)), state[3]);
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state[2] = veorq_u8(vaesmcq_u8(vaeseq_u8(state[1], zero)), state[2]);
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state[1] = veorq_u8(vaesmcq_u8(vaeseq_u8(state[0], zero)), state[1]);
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state[0] = veorq_u8(tmp, data);
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}
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static void
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crypto_aead_aegis256_init(const unsigned char *key, const unsigned char *iv,
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uint8x16_t *const state)
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{
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static CRYPTO_ALIGN(16) const unsigned char c1[] = {
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0xdb, 0x3d, 0x18, 0x55, 0x6d, 0xc2, 0x2f, 0xf1, 0x20, 0x11, 0x31, 0x42,
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0x73, 0xb5, 0x28, 0xdd
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};
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static CRYPTO_ALIGN(16) const unsigned char c2[] = {
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0x00, 0x01, 0x01, 0x02, 0x03, 0x05, 0x08, 0x0d, 0x15, 0x22, 0x37, 0x59,
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0x90, 0xe9, 0x79, 0x62
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};
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uint8x16_t k1;
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uint8x16_t k2;
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uint8x16_t k3;
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uint8x16_t k4;
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int i;
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k1 = vld1q_u8(&key[0]);
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k2 = vld1q_u8(&key[16]);
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k3 = veorq_u8(k1, vld1q_u8(&iv[0]));
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k4 = veorq_u8(k2, vld1q_u8(&iv[16]));
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state[0] = k3;
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state[1] = k4;
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state[2] = vld1q_u8(c1);
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state[3] = vld1q_u8(c2);
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state[4] = veorq_u8(k1, state[3]);
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state[5] = veorq_u8(k2, state[2]);
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for (i = 0; i < 4; i++) {
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crypto_aead_aegis256_update(state, k1);
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crypto_aead_aegis256_update(state, k2);
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crypto_aead_aegis256_update(state, k3);
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crypto_aead_aegis256_update(state, k4);
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}
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}
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static void
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crypto_aead_aegis256_mac(unsigned char *mac, unsigned long long mlen,
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unsigned long long adlen, uint8x16_t *const state)
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{
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uint8x16_t tmp;
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int i;
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tmp = vreinterpretq_u8_u64(vsetq_lane_u64(mlen << 3,
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vmovq_n_u64(adlen << 3), 1));
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tmp = veorq_u8(tmp, state[3]);
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for (i = 0; i < 7; i++) {
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crypto_aead_aegis256_update(state, tmp);
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}
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tmp = veorq_u8(state[5], state[4]);
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tmp = veorq_u8(tmp, state[3]);
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tmp = veorq_u8(tmp, state[2]);
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tmp = veorq_u8(tmp, state[1]);
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tmp = veorq_u8(tmp, state[0]);
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vst1q_u8(mac, tmp);
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}
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static void
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crypto_aead_aegis256_enc(unsigned char *const dst,
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const unsigned char *const src,
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uint8x16_t *const state)
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{
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uint8x16_t msg;
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uint8x16_t tmp;
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msg = vld1q_u8(src);
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tmp = veorq_u8(msg, state[5]);
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tmp = veorq_u8(tmp, state[4]);
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tmp = veorq_u8(tmp, state[1]);
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tmp = veorq_u8(tmp, vandq_u8(state[2], state[3]));
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vst1q_u8(dst, tmp);
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crypto_aead_aegis256_update(state, msg);
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}
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static void
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crypto_aead_aegis256_dec(unsigned char *const dst,
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const unsigned char *const src,
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uint8x16_t *const state)
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{
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uint8x16_t msg;
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msg = vld1q_u8(src);
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msg = veorq_u8(msg, state[5]);
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msg = veorq_u8(msg, state[4]);
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msg = veorq_u8(msg, state[1]);
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msg = veorq_u8(msg, vandq_u8(state[2], state[3]));
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vst1q_u8(dst, msg);
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crypto_aead_aegis256_update(state, msg);
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}
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int
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crypto_aead_aegis256_encrypt_detached(unsigned char *c, unsigned char *mac,
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unsigned long long *maclen_p, const unsigned char *m,
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unsigned long long mlen, const unsigned char *ad,
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unsigned long long adlen, const unsigned char *nsec,
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const unsigned char *npub, const unsigned char *k)
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{
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uint8x16_t state[6];
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CRYPTO_ALIGN(16) unsigned char src[16];
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CRYPTO_ALIGN(16) unsigned char dst[16];
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unsigned long long i;
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(void) nsec;
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crypto_aead_aegis256_init(k, npub, state);
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for (i = 0ULL; i + 16ULL <= adlen; i += 16ULL) {
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crypto_aead_aegis256_enc(dst, ad + i, state);
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}
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if (adlen & 0xf) {
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memset(src, 0, 16);
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memcpy(src, ad + i, adlen & 0xf);
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crypto_aead_aegis256_enc(dst, src, state);
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}
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for (i = 0ULL; i + 16ULL <= mlen; i += 16ULL) {
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crypto_aead_aegis256_enc(c + i, m + i, state);
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}
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if (mlen & 0xf) {
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memset(src, 0, 16);
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memcpy(src, m + i, mlen & 0xf);
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crypto_aead_aegis256_enc(dst, src, state);
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memcpy(c + i, dst, mlen & 0xf);
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}
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crypto_aead_aegis256_mac(mac, mlen, adlen, state);
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sodium_memzero(state, sizeof state);
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sodium_memzero(src, sizeof src);
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sodium_memzero(dst, sizeof dst);
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if (maclen_p != NULL) {
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*maclen_p = 16ULL;
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}
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return 0;
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}
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int
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crypto_aead_aegis256_encrypt(unsigned char *c, unsigned long long *clen_p, const unsigned char *m,
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unsigned long long mlen, const unsigned char *ad,
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unsigned long long adlen, const unsigned char *nsec,
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const unsigned char *npub, const unsigned char *k)
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{
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unsigned long long clen = 0ULL;
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int ret;
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if (mlen > crypto_aead_aegis256_MESSAGEBYTES_MAX) {
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sodium_misuse();
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}
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ret = crypto_aead_aegis256_encrypt_detached(c, c + mlen, NULL, m, mlen,
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ad, adlen, nsec, npub, k);
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if (clen_p != NULL) {
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if (ret == 0) {
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clen = mlen + 16ULL;
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}
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*clen_p = clen;
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}
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return ret;
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}
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int
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crypto_aead_aegis256_decrypt_detached(unsigned char *m, unsigned char *nsec, const unsigned char *c,
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unsigned long long clen, const unsigned char *mac,
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const unsigned char *ad, unsigned long long adlen,
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const unsigned char *npub, const unsigned char *k)
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{
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uint8x16_t state[6];
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CRYPTO_ALIGN(16) unsigned char src[16];
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CRYPTO_ALIGN(16) unsigned char dst[16];
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CRYPTO_ALIGN(16) unsigned char computed_mac[16];
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unsigned long long i;
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unsigned long long mlen;
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int ret;
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(void) nsec;
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mlen = clen;
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crypto_aead_aegis256_init(k, npub, state);
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for (i = 0ULL; i + 16ULL <= adlen; i += 16ULL) {
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crypto_aead_aegis256_enc(dst, ad + i, state);
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}
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if (adlen & 0xf) {
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memset(src, 0, 16);
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memcpy(src, ad + i, adlen & 0xf);
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crypto_aead_aegis256_enc(dst, src, state);
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}
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if (m != NULL) {
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for (i = 0ULL; i + 16ULL <= mlen; i += 16ULL) {
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crypto_aead_aegis256_dec(m + i, c + i, state);
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}
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} else {
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for (i = 0ULL; i + 16ULL <= mlen; i += 16ULL) {
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crypto_aead_aegis256_dec(dst, c + i, state);
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}
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}
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if (mlen & 0xf) {
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memset(src, 0, 16);
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memcpy(src, c + i, mlen & 0xf);
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crypto_aead_aegis256_dec(dst, src, state);
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if (m != NULL) {
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memcpy(m + i, dst, mlen & 0xf);
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}
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memset(dst, 0, mlen & 0xf);
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state[0] = veorq_u8(state[0], vld1q_u8(dst));
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}
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crypto_aead_aegis256_mac(computed_mac, mlen, adlen, state);
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sodium_memzero(state, sizeof state);
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sodium_memzero(src, sizeof src);
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sodium_memzero(dst, sizeof dst);
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ret = crypto_verify_16(computed_mac, mac);
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sodium_memzero(computed_mac, sizeof computed_mac);
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if (m == NULL) {
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return ret;
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}
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if (ret != 0) {
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memset(m, 0, mlen);
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return -1;
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}
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return 0;
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}
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int
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crypto_aead_aegis256_decrypt(unsigned char *m, unsigned long long *mlen_p, unsigned char *nsec,
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const unsigned char *c, unsigned long long clen,
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const unsigned char *ad, unsigned long long adlen,
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const unsigned char *npub, const unsigned char *k)
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{
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unsigned long long mlen = 0ULL;
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int ret = -1;
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if (clen >= 16ULL) {
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ret = crypto_aead_aegis256_decrypt_detached(m, nsec, c, clen - 16ULL, c + clen - 16ULL, ad,
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adlen, npub, k);
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}
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if (mlen_p != NULL) {
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if (ret == 0) {
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mlen = clen - 16ULL;
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}
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*mlen_p = mlen;
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}
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return ret;
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}
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int
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crypto_aead_aegis256_is_available(void)
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{
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return sodium_runtime_has_aesni();
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}
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#endif
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