#include"api.h"
#include <string.h>
typedef unsigned char u8;
typedef unsigned long long u64;
typedef unsigned int u32;
#define PR0_ROUNDS 76
#define PR_ROUNDS 28
#define PRF_ROUNDS 32
#define RATE 24
#define sbox(a, b, c, d, f, g, h)       \
{       \
	t1 = ~a; t2 = b & t1;t3 = c ^ t2; h = d ^ t3; t5 = b | c; t6 = d ^ t1; g = t5 ^ t6; t8 = b ^ d; t9 = t3 & t6; a = t8 ^ t9; t11 = g & t8; f = t3 ^ t11; \
}
#define ROTR961(a,b,n) (((a)<<(n))|((b)>>(64-n)))
#define ROTR962(a,b,n) (((b)<<(n))|((a)>>(32-n)))
#define ROTR96MORE321(a,b,n) ((b<<(n-32))>>32)
#define ROTR96MORE322(a,b,n) (b<<n|(u64)a<<(n-32)|b>>(96-n))
#define U32BIG(x) (x)
#define U64BIG(x) (x)
u8 constant7[76] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x41, 0x03, 0x06, 0x0c,
		0x18, 0x30, 0x61, 0x42, 0x05, 0x0a, 0x14, 0x28, 0x51, 0x23, 0x47, 0x0f,
		0x1e, 0x3c, 0x79, 0x72, 0x64, 0x48, 0x11, 0x22, 0x45, 0x0b, 0x16, 0x2c,
		0x59, 0x33, 0x67, 0x4e, 0x1d, 0x3a, 0x75, 0x6a, 0x54, 0x29, 0x53, 0x27,
		0x4f, 0x1f, 0x3e, 0x7d, 0x7a, 0x74, 0x68, 0x50, 0x21, 0x43, 0x07, 0x0e,
		0x1c, 0x38, 0x71, 0x62, 0x44, 0x09, 0x12, 0x24, 0x49, 0x13, 0x26, 0x4d,
		0x1b, 0x36, 0x6d, 0x5a, 0x35, 0x6b };
#define ROUND384(i){\
x00 ^= constant7[i];\
sbox(x00, x10, x20, x30, x50, x60, x70);\
sbox(x01, x11, x21, x31, x51, x61, x71);\
x11 = ROTR961(x51, x50, 1);\
x10 = ROTR962(x51, x50, 1);\
x21 = ROTR961(x61, x60, 8);\
x20 = ROTR962(x61, x60, 8);\
x31 = ROTR96MORE321(x71, x70, 55);\
x30 = ROTR96MORE322(x71, x70, 55);\
}
int crypto_aead_encrypt(unsigned char *c, unsigned long long *clen,
	const unsigned char *m, unsigned long long mlen,
	const unsigned char *ad, unsigned long long adlen,
	const unsigned char *nsec, const unsigned char *npub,
	const unsigned char *k) {
	u64 i;
	u64 t1, t2, t3, t5, t6, t8, t9, t11;
	u64 x30 = 0, x20 = 0, x10 = 0, x00 = 0;
	u32 x31 = 0, x21 = 0, x11 = 0, x01 = 0;
	u8 tempData[24] = { 0 };
	u8 tempData1[24] = { 0 };
	u64 x50, x60, x70;
	u32 x51, x61, x71;
	*clen = mlen + CRYPTO_KEYBYTES;
	// initialization
	x00 = U64BIG(*(u64*)(npub));
	x01 = U32BIG(*(u32*)(npub + 8));
	x10 = ((u64)U32BIG(*(u32*)(k)) << 32)
		| ((u64)U32BIG(*(u32*)(npub + 12)));
	x11 = U32BIG(*(u32*)(k + 4));
	x20 = U64BIG(*(u64*)(k + 8));
	x30 = 0;
	x31 = 0x80000000;
	for (i = 0; i < PR0_ROUNDS; i++) {
		ROUND384(i);
	}
	// process associated data
	if (adlen) {
		while (adlen >= RATE) {
			x00 ^= U64BIG(*(u64*)(ad));
			x01 ^= U32BIG(*(u32*)(ad + 8));
			x10 ^= ((u64)U32BIG(*(u32*)(ad + 16)) << 32) | ((u64)U32BIG(*(u32*)(ad + 12)));
			x11 ^= U32BIG(*(u32*)(ad + 20));
			for (i = 0; i < PR_ROUNDS; i++) {
				ROUND384(i);
			}
			adlen -= RATE;
			ad += RATE;
		}
		memset(tempData, 0, RATE);
		memcpy(tempData, ad, adlen);
		tempData[adlen] = 0x01;
		x00 ^= U64BIG(*(u64*)(tempData));
		x01 ^= U32BIG(*(u32*)(tempData + 8));
		x10 ^= ((u64)U32BIG(*(u32*)(tempData + 16)) << 32) | ((u64)U32BIG(*(u32*)(tempData + 12)));
		x11 ^= U32BIG(*(u32*)(tempData + 20));
		for (i = 0; i < PR_ROUNDS; i++) {
			ROUND384(i);
		}
	}
	x31 ^= 0x80000000;
	// process plaintext
	if (mlen) {
		while (mlen >= RATE) {
			x00 ^= U64BIG(*(u64*)(m));
			x01 ^= U32BIG(*(u32*)(m + 8));
			x10 ^= ((u64)U32BIG(*(u32*)(m + 16)) << 32) | ((u64)U32BIG(*(u32*)(m + 12)));
			x11 ^= U32BIG(*(u32*)(m + 20));
			*(u64*)c = U64BIG(x00);
			*(u32*)(c + 8) = U32BIG(x01);
			*(u32*)(c + 12) = U32BIG(x10);
			*(u32*)(c + 16) = U32BIG(x10 >> 32);
			*(u32*)(c + 20) = U32BIG(x11);
			for (i = 0; i < PR_ROUNDS; i++) {
				ROUND384(i);
			}
			mlen -= RATE;
			m += RATE;
			c += RATE;
		}
		memset(tempData, 0, RATE);
		memcpy(tempData, m, mlen);
		tempData[mlen] = 0x01;
		x00 ^= U64BIG(*(u64*)(tempData));
		x01 ^= U32BIG(*(u32*)(tempData + 8));
		x10 ^= ((u64)U32BIG(*(u32*)(tempData + 16)) << 32) | ((u64)U32BIG(*(u32*)(tempData + 12)));
		x11 ^= U32BIG(*(u32*)(tempData + 20));
		*(u64*)tempData1 = U64BIG(x00);
		*(u32*)(tempData1 + 8) = U32BIG(x01);
		*(u32*)(tempData1 + 12) = U32BIG(x10);
		*(u32*)(tempData1 + 16) = U32BIG(x10 >> 32);
		*(u32*)(tempData1 + 20) = U32BIG(x11);
		memcpy(c, tempData1, mlen * sizeof(unsigned char));
		c += mlen;
	}
	// finalization
	for (i = 0; i < PRF_ROUNDS; i++) {
		ROUND384(i);
	}
	// return tag
	*(u64*)tempData = U64BIG(x00);
	*(u32*)(tempData + 8) = U32BIG(x01);
	*(u32*)(tempData + 12) = U32BIG(x10);
	memcpy(c, tempData, CRYPTO_ABYTES);
	return 0;
}
int crypto_aead_decrypt(unsigned char *m, unsigned long long *mlen,
	unsigned char *nsec, const unsigned char *c, unsigned long long clen,
	const unsigned char *ad, unsigned long long adlen,
	const unsigned char *npub, const unsigned char *k) {
	*mlen = clen - CRYPTO_ABYTES;
	if (clen < CRYPTO_ABYTES)
		return -1;
	u64 i;
	u64 t1, t2, t3, t5, t6, t8, t9, t11;
	u64 x30 = 0, x20 = 0, x10 = 0, x00 = 0;
	u32 x31 = 0, x21 = 0, x11 = 0, x01 = 0;
	u8 tempData[24] = { 0 };
	u8 tempData1[24] = { 0 };
	u64 x50, x60, x70;
	u32 x51, x61, x71;
	// initialization
	x00 = U64BIG(*(u64*)(npub));
	x01 = U32BIG(*(u32*)(npub + 8));
	x10 = ((u64)U32BIG(*(u32*)(k)) << 32)
		| ((u64)U32BIG(*(u32*)(npub + 12)));
	x11 = U32BIG(*(u32*)(k + 4));
	x20 = U64BIG(*(u64*)(k + 8));
	x30 = 0;
	x31 = 0x80000000;
	for (i = 0; i < PR0_ROUNDS; i++) {
		ROUND384(i);
	}
	// process associated data
	if (adlen) {
		while (adlen >= RATE) {
			x00 ^= U64BIG(*(u64*)(ad));
			x01 ^= U32BIG(*(u32*)(ad + 8));
			x10 ^= ((u64)U32BIG(*(u32*)(ad + 16)) << 32) | ((u64)U32BIG(*(u32*)(ad + 12)));
			x11 ^= U32BIG(*(u32*)(ad + 20));
			for (i = 0; i < PR_ROUNDS; i++) {
				ROUND384(i);
			}
			adlen -= RATE;
			ad += RATE;
		}
		memset(tempData, 0, sizeof(tempData));
		memcpy(tempData, ad, adlen * sizeof(unsigned char));
		tempData[adlen] = 0x01;
		x00 ^= U64BIG(*(u64*)(tempData));
		x01 ^= U32BIG(*(u32*)(tempData + 8));
		x10 ^= ((u64)U32BIG(*(u32*)(tempData + 16)) << 32) | ((u64)U32BIG(*(u32*)(tempData + 12)));
		x11 ^= U32BIG(*(u32*)(tempData + 20));
		for (i = 0; i < PR_ROUNDS; i++) {
			ROUND384(i);
		}
	}
	x31 ^= 0x80000000;
	// process plaintext
	clen -= CRYPTO_KEYBYTES;
	if (clen) {
		while (clen >= RATE) {
			*(u64*)(m) = U64BIG(x00) ^ (*(u64*)(c));
			*(u32*)(m + 8) = U32BIG(x01) ^ (*(u32*)(c + 8));
			*(u32*)(m + 12) = U32BIG(x10) ^ (*(u32*)(c + 12));
			*(u32*)(m + 16) = U32BIG(x10 >> 32) ^ (*(u32*)(c + 16));
			*(u32*)(m + 20) = U32BIG(x11) ^ (*(u32*)(c + 20));
			x00 = U64BIG(*(u64*)(c));
			x01 = U32BIG(*(u32*)(c + 8));
			x10 = U64BIG(*(u64*)(c + 12));
			x11 = U32BIG(*(u32*)(c + 20));
			for (i = 0; i < PR_ROUNDS; i++) {
				ROUND384(i);
			}
			clen -= RATE;
			m += RATE;
			c += RATE;
		}
		memset(tempData, 0, sizeof(tempData));
		memcpy(tempData, c, clen * sizeof(unsigned char));
		tempData[clen] = 0x01;
		*(u64*)(tempData1) = U64BIG(x00) ^ (*(u64*)(tempData));
		*(u32*)(tempData1 + 8) = U32BIG(x01) ^ (*(u32*)(tempData + 8));
		//*(u64*)(tempData1 + 12) = U64BIG(x10) ^ (*(u64*)(tempData + 12));
		*(u32*)(tempData1 + 12) = U32BIG(x10) ^ (*(u32*)(tempData + 12));
		*(u32*)(tempData1 + 16) = U32BIG(x10 >> 32) ^ (*(u32*)(tempData + 16));
		*(u32*)(tempData1 + 20) = U32BIG(x11) ^ (*(u32*)(tempData + 20));
		memcpy(m, tempData1, clen * sizeof(unsigned char));
		memcpy(tempData1, c, clen * sizeof(unsigned char));
		x00 = U64BIG(*(u64*)(tempData1));
		x01 = U32BIG(*(u32*)(tempData1 + 8));
		x10 = ((u64)U32BIG(*(u32*)(tempData1 + 16)) << 32) | ((u64)U32BIG(*(u32*)(tempData1 + 12)));
		x11 = U32BIG(*(u32*)(tempData1 + 20));
		c += clen;
	}
	// finalization
	for (i = 0; i < PRF_ROUNDS; i++) {
		ROUND384(i);
	}
	// return -1 if verification fails
	*(u64*)(tempData1) = U64BIG(x00);
	*(u32*)(tempData1 + 8) = U32BIG(x01);
	*(u32*)(tempData1 + 12) = U32BIG(x10);
	if (memcmp((void*)tempData1, (void*)c, CRYPTO_ABYTES)) {
		memset(m, 0, sizeof(unsigned char) * (*mlen));
		*mlen = 0;
		return -1;
	}
	return 0;
}