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n2n/speck.c

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// cipher SPECK -- 128 bit block size -- 256 bit key size -- CTR mode
// taken from (and modified: removed pure crypto-stream generation and seperated key expansion)
// https://github.com/nsacyber/simon-speck-supercop/blob/master/crypto_stream/speck128256ctr/
#include <stdlib.h>
#include "portable_endian.h"
#include "speck.h"
#if defined (__AVX2__) // AVX support ----------------------------------------------------
#define LCS(x,r) (((x)<<r)|((x)>>(64-r)))
#define RCS(x,r) (((x)>>r)|((x)<<(64-r)))
#define XOR _mm256_xor_si256
#define AND _mm256_and_si256
#define ADD _mm256_add_epi64
#define SL _mm256_slli_epi64
#define SR _mm256_srli_epi64
#define _q SET(0x3,0x1,0x2,0x0)
#define _four SET(0x4,0x4,0x4,0x4)
#define SET _mm256_set_epi64x
#define SET1(X,c) (X=SET(c,c,c,c))
#define SET4(X,c) (X=SET(c,c,c,c), X=ADD(X,_q))
#define LOW _mm256_unpacklo_epi64
#define HIGH _mm256_unpackhi_epi64
#define LD(ip) _mm256_loadu_si256((__m256i *)(ip))
#define ST(ip,X) _mm256_storeu_si256((__m256i *)(ip),X)
#define STORE(out,X,Y) (ST(out,LOW(Y,X)), ST(out+32,HIGH(Y,X)))
#define STORE_ALT(out,X,Y) (ST(out,LOW(X,Y)), ST(out+32,HIGH(X,Y)))
#define XOR_STORE(in,out,X,Y) (ST(out,XOR(LD(in),LOW(Y,X))), ST(out+32,XOR(LD(in+32),HIGH(Y,X))))
#define XOR_STORE_ALT(in,out,X,Y) (ST(out,XOR(LD(in),LOW(X,Y))), ST(out+32,XOR(LD(in+32),HIGH(X,Y))))
#define SHFL _mm256_shuffle_epi8
#define R8 SET(0x080f0e0d0c0b0a09LL,0x0007060504030201LL,0x080f0e0d0c0b0a09LL,0x0007060504030201LL)
#define L8 SET(0x0e0d0c0b0a09080fLL,0x0605040302010007LL,0x0e0d0c0b0a09080fLL,0x0605040302010007LL)
#define ROL8(X) (SHFL(X,L8))
#define ROR8(X) (SHFL(X,R8))
#define ROL(X,r) (XOR(SL(X,r),SR(X,(64-r))))
#define ROR(X,r) (XOR(SR(X,r),SL(X,(64-r))))
#define numrounds 34
#define numkeywords 4
#define R(X,Y,k) (X=XOR(ADD(ROR8(X),Y),k), Y=XOR(ROL(Y,3),X))
#define Rx4(X,Y,k) (R(X[0],Y[0],k))
#define Rx8(X,Y,k) (R(X[0],Y[0],k), R(X[1],Y[1],k))
#define Rx12(X,Y,k) (R(X[0],Y[0],k), R(X[1],Y[1],k), R(X[2],Y[2],k))
#define Rx16(X,Y,k) (X[0]=ROR8(X[0]), X[0]=ADD(X[0],Y[0]), X[1]=ROR8(X[1]), X[1]=ADD(X[1],Y[1]), \
X[2]=ROR8(X[2]), X[2]=ADD(X[2],Y[2]), X[3]=ROR8(X[3]), X[3]=ADD(X[3],Y[3]), \
X[0]=XOR(X[0],k), X[1]=XOR(X[1],k), X[2]=XOR(X[2],k), X[3]=XOR(X[3],k), \
Z[0]=Y[0], Z[1]=Y[1], Z[2]=Y[2], Z[3]=Y[3], \
Z[0]=SL(Z[0],3), Y[0]=SR(Y[0],61), Z[1]=SL(Z[1],3), Y[1]=SR(Y[1],61), \
Z[2]=SL(Z[2],3), Y[2]=SR(Y[2],61), Z[3]=SL(Z[3],3), Y[3]=SR(Y[3],61), \
Y[0]=XOR(Y[0],Z[0]), Y[1]=XOR(Y[1],Z[1]), Y[2]=XOR(Y[2],Z[2]), Y[3]=XOR(Y[3],Z[3]), \
Y[0]=XOR(X[0],Y[0]), Y[1]=XOR(X[1],Y[1]), Y[2]=XOR(X[2],Y[2]), Y[3]=XOR(X[3],Y[3]))
#define Rx2(x,y,k) (x[0]=RCS(x[0],8), x[1]=RCS(x[1],8), x[0]+=y[0], x[1]+=y[1], \
x[0]^=k, x[1]^=k, y[0]=LCS(y[0],3), y[1]=LCS(y[1],3), y[0]^=x[0], y[1]^=x[1])
#define Rx1(x,y,k) (x[0]=RCS(x[0],8), x[0]+=y[0], x[0]^=k, y[0]=LCS(y[0],3), y[0]^=x[0])
#define Rx1b(x,y,k) (x=RCS(x,8), x+=y, x^=k, y=LCS(y,3), y^=x)
#define Encrypt(X,Y,k,n) (Rx##n(X,Y,k[0]), Rx##n(X,Y,k[1]), Rx##n(X,Y,k[2]), Rx##n(X,Y,k[3]), Rx##n(X,Y,k[4]), Rx##n(X,Y,k[5]), Rx##n(X,Y,k[6]), Rx##n(X,Y,k[7]), \
Rx##n(X,Y,k[8]), Rx##n(X,Y,k[9]), Rx##n(X,Y,k[10]), Rx##n(X,Y,k[11]), Rx##n(X,Y,k[12]), Rx##n(X,Y,k[13]), Rx##n(X,Y,k[14]), Rx##n(X,Y,k[15]), \
Rx##n(X,Y,k[16]), Rx##n(X,Y,k[17]), Rx##n(X,Y,k[18]), Rx##n(X,Y,k[19]), Rx##n(X,Y,k[20]), Rx##n(X,Y,k[21]), Rx##n(X,Y,k[22]), Rx##n(X,Y,k[23]), \
Rx##n(X,Y,k[24]), Rx##n(X,Y,k[25]), Rx##n(X,Y,k[26]), Rx##n(X,Y,k[27]), Rx##n(X,Y,k[28]), Rx##n(X,Y,k[29]), Rx##n(X,Y,k[30]), Rx##n(X,Y,k[31]), \
Rx##n(X,Y,k[32]), Rx##n(X,Y,k[33]))
#define RK(X,Y,k,key,i) (SET1(k[i],Y), key[i]=Y, X=RCS(X,8), X+=Y, X^=i, Y=LCS(Y,3), Y^=X)
#define EK(A,B,C,D,k,key) (RK(B,A,k,key,0), RK(C,A,k,key,1), RK(D,A,k,key,2), RK(B,A,k,key,3), RK(C,A,k,key,4), RK(D,A,k,key,5), RK(B,A,k,key,6), \
RK(C,A,k,key,7), RK(D,A,k,key,8), RK(B,A,k,key,9), RK(C,A,k,key,10), RK(D,A,k,key,11), RK(B,A,k,key,12), RK(C,A,k,key,13), \
RK(D,A,k,key,14), RK(B,A,k,key,15), RK(C,A,k,key,16), RK(D,A,k,key,17), RK(B,A,k,key,18), RK(C,A,k,key,19), RK(D,A,k,key,20), \
RK(B,A,k,key,21), RK(C,A,k,key,22), RK(D,A,k,key,23), RK(B,A,k,key,24), RK(C,A,k,key,25), RK(D,A,k,key,26), RK(B,A,k,key,27), \
RK(C,A,k,key,28), RK(D,A,k,key,29), RK(B,A,k,key,30), RK(C,A,k,key,31), RK(D,A,k,key,32), RK(B,A,k,key,33))
static int speck_encrypt_xor(unsigned char *out, const unsigned char *in, u64 nonce[], speck_context_t *ctx, int numbytes) {
u64 x[2], y[2];
u256 X[4], Y[4], Z[4];
if (numbytes == 16) {
x[0] = nonce[1]; y[0] = nonce[0]; nonce[0]++;
Encrypt (x, y, ctx->key, 1);
((u64 *)out)[1] = x[0]; ((u64 *)out)[0] = y[0];
return 0;
}
if (numbytes == 32) {
x[0] = nonce[1]; y[0] = nonce[0]; nonce[0]++;
x[1] = nonce[1]; y[1] = nonce[0]; nonce[0]++;
Encrypt (x , y, ctx->key, 2);
((u64 *)out)[1] = x[0] ^ ((u64 *)in)[1]; ((u64 *)out)[0] = y[0] ^ ((u64 *)in)[0];
((u64 *)out)[3] = x[1] ^ ((u64 *)in)[3]; ((u64 *)out)[2] = y[1] ^ ((u64 *)in)[2];
return 0;
}
SET1 (X[0], nonce[1]); SET4 (Y[0], nonce[0]);
if (numbytes == 64)
Encrypt (X, Y, ctx->rk, 4);
else {
X[1] = X[0];
Y[1] = ADD (Y[0], _four);
if (numbytes == 128)
Encrypt (X, Y, ctx->rk, 8);
else {
X[2] = X[0];
Y[2] = ADD (Y[1], _four);
if (numbytes == 192)
Encrypt (X, Y, ctx->rk, 12);
else {
X[3] = X[0];
Y[3] = ADD (Y[2], _four);
Encrypt (X, Y, ctx->rk, 16);
}
}
}
nonce[0] += (numbytes>>4);
XOR_STORE (in, out, X[0], Y[0]);
if (numbytes >= 128)
XOR_STORE (in + 64, out + 64, X[1], Y[1]);
if (numbytes >= 192)
XOR_STORE (in + 128, out + 128, X[2], Y[2]);
if (numbytes >= 256)
XOR_STORE (in + 192, out + 192, X[3], Y[3]);
return 0;
}
int speck_ctr( unsigned char *out, const unsigned char *in, unsigned long long inlen,
const unsigned char *n, speck_context_t *ctx) {
int i;
u64 nonce[2];
unsigned char block[16];
u64 * const block64 = (u64 *)block;
if (!inlen)
return 0;
nonce[0] = ((u64 *)n)[0];
nonce[1] = ((u64 *)n)[1];
while (inlen >= 256) {
speck_encrypt_xor (out, in, nonce, ctx, 256);
in += 256; inlen -= 256; out += 256;
}
if (inlen >= 192) {
speck_encrypt_xor (out, in, nonce, ctx, 192);
in += 192; inlen -= 192; out += 192;
}
if (inlen >= 128) {
speck_encrypt_xor (out, in, nonce, ctx, 128);
in += 128; inlen -= 128; out += 128;
}
if (inlen >= 64) {
speck_encrypt_xor (out, in, nonce, ctx, 64);
in += 64; inlen -= 64; out += 64;
}
if (inlen >= 32) {
speck_encrypt_xor (out, in, nonce, ctx, 32);
in += 32; inlen -= 32; out += 32;
}
if (inlen >= 16) {
speck_encrypt_xor (block, in, nonce, ctx, 16);
((u64 *)out)[0] = block64[0] ^ ((u64 *)in)[0];
((u64 *)out)[1] = block64[1] ^ ((u64 *)in)[1];
in += 16; inlen -= 16; out += 16;
}
if (inlen > 0) {
speck_encrypt_xor (block, in, nonce, ctx, 16);
for (i = 0; i < inlen; i++)
out[i] = block[i] ^ in[i];
}
return 0;
}
int speck_expand_key (const unsigned char *k, speck_context_t *ctx) {
u64 K[4];
size_t i;
for (i = 0; i < numkeywords; i++)
K[i] = ((u64 *)k)[i];
EK (K[0], K[1], K[2], K[3], ctx->rk, ctx->key);
return 0;
}
#elif defined (__SSE4_2__) // SSE support -------------------------------------------------
#define LCS(x,r) (((x)<<r)|((x)>>(64-r)))
#define RCS(x,r) (((x)>>r)|((x)<<(64-r)))
#define XOR _mm_xor_si128
#define AND _mm_and_si128
#define ADD _mm_add_epi64
#define SL _mm_slli_epi64
#define SR _mm_srli_epi64
#define _q SET(0x1,0x0)
#define _two SET(0x2,0x2)
#define SET _mm_set_epi64x
#define SET1(X,c) (X=SET(c,c))
#define SET2(X,c) (X=SET(c,c), X=ADD(X,_q))
#define LOW _mm_unpacklo_epi64
#define HIGH _mm_unpackhi_epi64
#define LD(ip) _mm_loadu_si128((__m128i *)(ip))
#define ST(ip,X) _mm_storeu_si128((__m128i *)(ip),X)
#define STORE(out,X,Y) (ST(out,LOW(Y,X)), ST(out+16,HIGH(Y,X)))
#define STORE_ALT(out,X,Y) (ST(out,LOW(X,Y)), ST(out+16,HIGH(X,Y)))
#define XOR_STORE(in,out,X,Y) (ST(out,XOR(LD(in),LOW(Y,X))), ST(out+16,XOR(LD(in+16),HIGH(Y,X))))
#define XOR_STORE_ALT(in,out,X,Y) (ST(out,XOR(LD(in),LOW(X,Y))), ST(out+16,XOR(LD(in+16),HIGH(X,Y))))
#define SHFL _mm_shuffle_epi8
#define R8 _mm_set_epi64x(0x080f0e0d0c0b0a09LL,0x0007060504030201LL)
#define L8 _mm_set_epi64x(0x0e0d0c0b0a09080fLL,0x0605040302010007LL)
#define ROL8(X) (SHFL(X,L8))
#define ROR8(X) (SHFL(X,R8))
#define ROL(X,r) (XOR(SL(X,r),SR(X,(64-r))))
#define ROR(X,r) (XOR(SR(X,r),SL(X,(64-r))))
#define numrounds 34
#define numkeywords 4
#define R(X,Y,k) (X=XOR(ADD(ROR8(X),Y),k), Y=XOR(ROL(Y,3),X))
#define Rx2(X,Y,k) (R(X[0],Y[0],k))
#define Rx4(X,Y,k) (R(X[0],Y[0],k), R(X[1],Y[1],k))
#define Rx6(X,Y,k) (R(X[0],Y[0],k), R(X[1],Y[1],k), R(X[2],Y[2],k))
#define Rx8(X,Y,k) (X[0]=ROR8(X[0]), X[0]=ADD(X[0],Y[0]), X[1]=ROR8(X[1]), X[1]=ADD(X[1],Y[1]), \
X[2]=ROR8(X[2]), X[2]=ADD(X[2],Y[2]), X[3]=ROR8(X[3]), X[3]=ADD(X[3],Y[3]), \
X[0]=XOR(X[0],k), X[1]=XOR(X[1],k), X[2]=XOR(X[2],k), X[3]=XOR(X[3],k), \
Z[0]=Y[0], Z[1]=Y[1], Z[2]=Y[2], Z[3]=Y[3], \
Z[0]=SL(Z[0],3), Y[0]=SR(Y[0],61), Z[1]=SL(Z[1],3), Y[1]=SR(Y[1],61), \
Z[2]=SL(Z[2],3), Y[2]=SR(Y[2],61), Z[3]=SL(Z[3],3), Y[3]=SR(Y[3],61), \
Y[0]=XOR(Y[0],Z[0]), Y[1]=XOR(Y[1],Z[1]), Y[2]=XOR(Y[2],Z[2]), Y[3]=XOR(Y[3],Z[3]), \
Y[0]=XOR(X[0],Y[0]), Y[1]=XOR(X[1],Y[1]), Y[2]=XOR(X[2],Y[2]), Y[3]=XOR(X[3],Y[3]))
#define Rx1(x,y,k) (x[0]=RCS(x[0],8), x[0]+=y[0], x[0]^=k, y[0]=LCS(y[0],3), y[0]^=x[0])
#define Rx1b(x,y,k) (x=RCS(x,8), x+=y, x^=k, y=LCS(y,3), y^=x)
#define Encrypt(X,Y,k,n) (Rx##n(X,Y,k[0]), Rx##n(X,Y,k[1]), Rx##n(X,Y,k[2]), Rx##n(X,Y,k[3]), Rx##n(X,Y,k[4]), Rx##n(X,Y,k[5]), Rx##n(X,Y,k[6]), Rx##n(X,Y,k[7]), \
Rx##n(X,Y,k[8]), Rx##n(X,Y,k[9]), Rx##n(X,Y,k[10]), Rx##n(X,Y,k[11]), Rx##n(X,Y,k[12]), Rx##n(X,Y,k[13]), Rx##n(X,Y,k[14]), Rx##n(X,Y,k[15]), \
Rx##n(X,Y,k[16]), Rx##n(X,Y,k[17]), Rx##n(X,Y,k[18]), Rx##n(X,Y,k[19]), Rx##n(X,Y,k[20]), Rx##n(X,Y,k[21]), Rx##n(X,Y,k[22]), Rx##n(X,Y,k[23]), \
Rx##n(X,Y,k[24]), Rx##n(X,Y,k[25]), Rx##n(X,Y,k[26]), Rx##n(X,Y,k[27]), Rx##n(X,Y,k[28]), Rx##n(X,Y,k[29]), Rx##n(X,Y,k[30]), Rx##n(X,Y,k[31]), \
Rx##n(X,Y,k[32]), Rx##n(X,Y,k[33]))
#define RK(X,Y,k,key,i) (SET1(k[i],Y), key[i]=Y, X=RCS(X,8), X+=Y, X^=i, Y=LCS(Y,3), Y^=X)
#define EK(A,B,C,D,k,key) (RK(B,A,k,key,0), RK(C,A,k,key,1), RK(D,A,k,key,2), RK(B,A,k,key,3), RK(C,A,k,key,4), RK(D,A,k,key,5), RK(B,A,k,key,6), \
RK(C,A,k,key,7), RK(D,A,k,key,8), RK(B,A,k,key,9), RK(C,A,k,key,10), RK(D,A,k,key,11), RK(B,A,k,key,12), RK(C,A,k,key,13), \
RK(D,A,k,key,14), RK(B,A,k,key,15), RK(C,A,k,key,16), RK(D,A,k,key,17), RK(B,A,k,key,18), RK(C,A,k,key,19), RK(D,A,k,key,20), \
RK(B,A,k,key,21), RK(C,A,k,key,22), RK(D,A,k,key,23), RK(B,A,k,key,24), RK(C,A,k,key,25), RK(D,A,k,key,26), RK(B,A,k,key,27), \
RK(C,A,k,key,28), RK(D,A,k,key,29), RK(B,A,k,key,30), RK(C,A,k,key,31), RK(D,A,k,key,32), RK(B,A,k,key,33))
static int speck_encrypt_xor (unsigned char *out, const unsigned char *in, u64 nonce[], const speck_context_t ctx, int numbytes) {
u64 x[2], y[2];
u128 X[4], Y[4], Z[4];
if (numbytes == 16) {
x[0] = nonce[1]; y[0] = nonce[0]; nonce[0]++;
Encrypt (x, y, ctx.key, 1);
((u64 *)out)[1] = x[0]; ((u64 *)out)[0] = y[0];
return 0;
}
SET1 (X[0], nonce[1]); SET2 (Y[0], nonce[0]);
if (numbytes == 32)
Encrypt (X, Y, ctx.rk, 2);
else {
X[1] = X[0]; Y[1] = ADD (Y[0], _two);
if (numbytes == 64)
Encrypt (X, Y, ctx.rk, 4);
else {
X[2] = X[0]; Y[2] = ADD (Y[1], _two);
if (numbytes == 96)
Encrypt (X, Y, ctx.rk, 6);
else {
X[3] = X[0]; Y[3] = ADD (Y[2], _two);
Encrypt (X, Y, ctx.rk, 8);
}
}
}
nonce[0] += (numbytes>>4);
XOR_STORE (in, out, X[0], Y[0]);
if (numbytes >= 64)
XOR_STORE (in + 32, out + 32, X[1], Y[1]);
if (numbytes >= 96)
XOR_STORE (in + 64, out + 64, X[2], Y[2]);
if (numbytes >= 128)
XOR_STORE (in + 96, out + 96, X[3], Y[3]);
return 0;
}
int speck_ctr (unsigned char *out, const unsigned char *in, unsigned long long inlen,
const unsigned char *n, const speck_context_t ctx) {
int i;
u64 nonce[2];
unsigned char block[16];
u64 * const block64 = (u64 *)block;
if (!inlen)
return 0;
nonce[0] = ((u64 *)n)[0];
nonce[1] = ((u64 *)n)[1];
while (inlen >= 128) {
speck_encrypt_xor (out, in, nonce, ctx, 128);
in += 128; inlen -= 128; out += 128;
}
if (inlen >= 96) {
speck_encrypt_xor (out, in, nonce, ctx, 96);
in += 96; inlen -= 96; out += 96;
}
if (inlen >= 64) {
speck_encrypt_xor (out, in, nonce, ctx, 64);
in += 64; inlen -= 64; out += 64;
}
if (inlen >= 32) {
speck_encrypt_xor (out, in, nonce, ctx, 32);
in += 32; inlen -= 32; out += 32;
}
if (inlen >= 16) {
speck_encrypt_xor (block, in, nonce, ctx, 16);
((u64 *)out)[0] = block64[0] ^ ((u64 *)in)[0];
((u64 *)out)[1] = block64[1] ^ ((u64 *)in)[1];
in += 16; inlen -= 16; out += 16;
}
if (inlen > 0) {
speck_encrypt_xor (block, in, nonce, ctx, 16);
for (i = 0; i < inlen; i++)
out[i] = block[i] ^ in[i];
}
return 0;
}
int speck_expand_key (const unsigned char *k, speck_context_t *ctx) {
u64 K[4];
size_t i;
for (i = 0; i < numkeywords; i++)
K[i] = ((u64 *)k)[i];
EK (K[0], K[1], K[2], K[3], ctx->rk, ctx->key);
return 0;
}
#elif defined (__ARM_NEON) // NEON support -------------------------------------------
#define LCS(x,r) (((x)<<r)|((x)>>(64-r)))
#define RCS(x,r) (((x)>>r)|((x)<<(64-r)))
#define XOR veorq_u64
#define AND vandq_u64
#define ADD vaddq_u64
#define SL vshlq_n_u64
#define SR vshrq_n_u64
#define SET(a,b) vcombine_u64((uint64x1_t)(a),(uint64x1_t)(b))
#define SET1(X,c) (X=SET(c,c))
#define SET2(X,c) (SET1(X,c), X=ADD(X,SET(0x1ll,0x0ll)),c+=2)
#define LOW(Z) vgetq_lane_u64(Z,0)
#define HIGH(Z) vgetq_lane_u64(Z,1)
#define STORE(ip,X,Y) (((u64 *)(ip))[0]=HIGH(Y), ((u64 *)(ip))[1]=HIGH(X), ((u64 *)(ip))[2]=LOW(Y), ((u64 *)(ip))[3]=LOW(X))
#define XOR_STORE(in,out,X,Y) (Y=XOR(Y,SET(((u64 *)(in))[2],((u64 *)(in))[0])), X=XOR(X,SET(((u64 *)(in))[3],((u64 *)(in))[1])), STORE(out,X,Y))
#define ROR(X,r) vsriq_n_u64(SL(X,(64-r)),X,r)
#define ROL(X,r) ROR(X,(64-r))
#define tableR vcreate_u8(0x0007060504030201LL)
#define tableL vcreate_u8(0x0605040302010007LL)
#define ROR8(X) SET(vtbl1_u8((uint8x8_t)vget_low_u64(X),tableR), vtbl1_u8((uint8x8_t)vget_high_u64(X),tableR))
#define ROL8(X) SET(vtbl1_u8((uint8x8_t)vget_low_u64(X),tableL), vtbl1_u8((uint8x8_t)vget_high_u64(X),tableL))
#define numrounds 34
#define numkeywords 4
#define R(X,Y,k) (X=XOR(ADD(ROR8(X),Y),k), Y=XOR(ROL(Y,3),X))
#define Rx2(X,Y,k) (R(X[0],Y[0],k))
#define Rx4(X,Y,k) (R(X[0],Y[0],k), R(X[1],Y[1],k))
#define Rx6(X,Y,k) (R(X[0],Y[0],k), R(X[1],Y[1],k), R(X[2],Y[2],k))
#define Rx8(X,Y,k) (X[0]=ROR8(X[0]), X[0]=ADD(X[0],Y[0]), X[0]=XOR(X[0],k), X[1]=ROR8(X[1]), X[1]=ADD(X[1],Y[1]), X[1]=XOR(X[1],k), \
X[2]=ROR8(X[2]), X[2]=ADD(X[2],Y[2]), X[2]=XOR(X[2],k), X[3]=ROR8(X[3]), X[3]=ADD(X[3],Y[3]), X[3]=XOR(X[3],k), \
Z[0]=SL(Y[0],3), Z[1]=SL(Y[1],3), Z[2]=SL(Y[2],3), Z[3]=SL(Y[3],3), \
Y[0]=SR(Y[0],61), Y[1]=SR(Y[1],61), Y[2]=SR(Y[2],61), Y[3]=SR(Y[3],61), \
Y[0]=XOR(Y[0],Z[0]), Y[1]=XOR(Y[1],Z[1]), Y[2]=XOR(Y[2],Z[2]), Y[3]=XOR(Y[3],Z[3]), \
Y[0]=XOR(X[0],Y[0]), Y[1]=XOR(X[1],Y[1]), Y[2]=XOR(X[2],Y[2]), Y[3]=XOR(X[3],Y[3]))
#define Rx1(x,y,k) (x[0]=RCS(x[0],8), x[0]+=y[0], x[0]^=k, y[0]=LCS(y[0],3), y[0]^=x[0])
#define Rx1b(x,y,k) (x=RCS(x,8), x+=y, x^=k, y=LCS(y,3), y^=x)
#define Encrypt(X,Y,k,n) (Rx##n(X,Y,k[0]), Rx##n(X,Y,k[1]), Rx##n(X,Y,k[2]), Rx##n(X,Y,k[3]), Rx##n(X,Y,k[4]), Rx##n(X,Y,k[5]), Rx##n(X,Y,k[6]), Rx##n(X,Y,k[7]), \
Rx##n(X,Y,k[8]), Rx##n(X,Y,k[9]), Rx##n(X,Y,k[10]), Rx##n(X,Y,k[11]), Rx##n(X,Y,k[12]), Rx##n(X,Y,k[13]), Rx##n(X,Y,k[14]), Rx##n(X,Y,k[15]), \
Rx##n(X,Y,k[16]), Rx##n(X,Y,k[17]), Rx##n(X,Y,k[18]), Rx##n(X,Y,k[19]), Rx##n(X,Y,k[20]), Rx##n(X,Y,k[21]), Rx##n(X,Y,k[22]), Rx##n(X,Y,k[23]), \
Rx##n(X,Y,k[24]), Rx##n(X,Y,k[25]), Rx##n(X,Y,k[26]), Rx##n(X,Y,k[27]), Rx##n(X,Y,k[28]), Rx##n(X,Y,k[29]), Rx##n(X,Y,k[30]), Rx##n(X,Y,k[31]), \
Rx##n(X,Y,k[32]), Rx##n(X,Y,k[33]))
#define RK(X,Y,k,key,i) (SET1(k[i],Y), key[i]=Y, X=RCS(X,8), X+=Y, X^=i, Y=LCS(Y,3), Y^=X)
#define EK(A,B,C,D,k,key) (RK(B,A,k,key,0), RK(C,A,k,key,1), RK(D,A,k,key,2), RK(B,A,k,key,3), RK(C,A,k,key,4), RK(D,A,k,key,5), RK(B,A,k,key,6), \
RK(C,A,k,key,7), RK(D,A,k,key,8), RK(B,A,k,key,9), RK(C,A,k,key,10), RK(D,A,k,key,11), RK(B,A,k,key,12), RK(C,A,k,key,13), \
RK(D,A,k,key,14), RK(B,A,k,key,15), RK(C,A,k,key,16), RK(D,A,k,key,17), RK(B,A,k,key,18), RK(C,A,k,key,19), RK(D,A,k,key,20), \
RK(B,A,k,key,21), RK(C,A,k,key,22), RK(D,A,k,key,23), RK(B,A,k,key,24), RK(C,A,k,key,25), RK(D,A,k,key,26), RK(B,A,k,key,27), \
RK(C,A,k,key,28), RK(D,A,k,key,29), RK(B,A,k,key,30), RK(C,A,k,key,31), RK(D,A,k,key,32), RK(B,A,k,key,33))
static int speck_encrypt_xor (unsigned char *out, const unsigned char *in, u64 nonce[], speck_context_t *ctx, int numbytes) {
u64 x[2], y[2];
u128 X[4], Y[4], Z[4];
if (numbytes == 16) {
x[0] = nonce[1]; y[0]=nonce[0]; nonce[0]++;
Encrypt (x, y, ctx->key, 1);
((u64 *)out)[1] = x[0]; ((u64 *)out)[0] = y[0];
return 0;
}
SET1 (X[0], nonce[1]); SET2 (Y[0], nonce[0]);
if (numbytes == 32)
Encrypt (X, Y, ctx->rk, 2);
else {
X[1] = X[0]; SET2 (Y[1], nonce[0]);
if (numbytes == 64)
Encrypt (X, Y, ctx->rk, 4);
else {
X[2] = X[0]; SET2 (Y[2], nonce[0]);
if (numbytes == 96)
Encrypt (X, Y, ctx->rk, 6);
else {
X[3] = X[0]; SET2 (Y[3], nonce[0]);
Encrypt (X, Y, ctx->rk, 8);
}
}
}
XOR_STORE (in, out, X[0], Y[0]);
if (numbytes >= 64)
XOR_STORE (in + 32, out + 32, X[1], Y[1]);
if (numbytes >= 96)
XOR_STORE (in + 64, out + 64, X[2], Y[2]);
if (numbytes >= 128)
XOR_STORE (in + 96, out + 96, X[3], Y[3]);
return 0;
}
int speck_ctr (unsigned char *out, const unsigned char *in, unsigned long long inlen,
const unsigned char *n, speck_context_t *ctx) {
int i;
u64 nonce[2];
unsigned char block[16];
u64 *const block64 = (u64 *)block;
if (!inlen)
return 0;
nonce[0] = ((u64 *)n)[0];
nonce[1] = ((u64 *)n)[1];
while (inlen >= 128) {
speck_encrypt_xor (out, in, nonce, ctx, 128);
in += 128; inlen -= 128; out += 128;
}
if (inlen >= 96) {
speck_encrypt_xor (out, in, nonce, ctx, 96);
in += 96; inlen -= 96; out += 96;
}
if (inlen >= 64) {
speck_encrypt_xor (out, in, nonce, ctx, 64);
in += 64; inlen -= 64; out += 64;
}
if (inlen >= 32) {
speck_encrypt_xor (out, in, nonce, ctx, 32);
in += 32; inlen -= 32; out += 32;
}
if (inlen >= 16) {
speck_encrypt_xor (block, in, nonce, ctx, 16);
((u64 *)out)[0] = block64[0] ^ ((u64 *)in)[0];
((u64 *)out)[1] = block64[1] ^ ((u64 *)in)[1];
in += 16; inlen -= 16; out += 16;
}
if (inlen > 0) {
speck_encrypt_xor (block, in, nonce, ctx, 16);
for (i = 0; i < inlen; i++)
out[i] = block[i] ^ in[i];
}
return 0;
}
int speck_expand_key (const unsigned char *k, speck_context_t *ctx) {
u64 K[4];
size_t i;
for (i = 0; i < numkeywords; i++)
K[i] = ((u64 *)k)[i];
EK (K[0], K[1], K[2], K[3], ctx->rk, ctx->key);
return 0;
}
#else // plain C ----------------------------------------------------------------
#define ROR(x,r) (((x)>>(r))|((x)<<(64-(r))))
#define ROL(x,r) (((x)<<(r))|((x)>>(64-(r))))
#define R(x,y,k) (x=ROR(x,8), x+=y, x^=k, y=ROL(y,3), y^=x)
static int speck_encrypt (u64 *u, u64 *v, speck_context_t *ctx) {
u64 i, x = *u, y = *v;
for (i = 0; i < 34; i++)
R (x, y, ctx->key[i]);
*u = x; *v = y;
return 0;
}
int speck_ctr (unsigned char *out, const unsigned char *in, unsigned long long inlen,
const unsigned char *n, speck_context_t *ctx) {
u64 i, nonce[2], x, y, t;
unsigned char *block = malloc (16);
if (!inlen) {
free (block);
return 0;
}
nonce[0] = htole64 ( ((u64*)n)[0] );
nonce[1] = htole64 ( ((u64*)n)[1] );
t=0;
while (inlen >= 16) {
x = nonce[1]; y = nonce[0]; nonce[0]++;
speck_encrypt (&x, &y, ctx);
((u64 *)out)[1+t] = htole64 (x ^ ((u64 *)in)[1+t]);
((u64 *)out)[0+t] = htole64 (y ^ ((u64 *)in)[0+t]);
t += 2;
inlen -= 16;
}
if (inlen > 0) {
x = nonce[1]; y = nonce[0];
speck_encrypt (&x, &y, ctx);
((u64 *)block)[1] = htole64 (x); ((u64 *)block)[0] = htole64 (y);
for (i = 0; i < inlen; i++)
out[i + 8*t] = block[i] ^ in[i + 8*t];
}
free (block);
return 0;
}
int speck_expand_key (const unsigned char *k, speck_context_t *ctx) {
u64 K[4];
u64 i;
for (i = 0; i < 4; i++)
K[i] = htole64 ( ((u64 *)k)[i] );
for (i = 0; i < 33; i += 3) {
ctx->key[i ] = K[0];
R (K[1], K[0], i );
ctx->key[i+1] = K[0];
R (K[2], K[0], i + 1);
ctx->key[i+2] = K[0];
R (K[3], K[0], i + 2);
}
ctx->key[33] = K[0];
return 1;
}
#endif // AVX, SSE, NEON, plain C ------------------------------------------------
// cipher SPECK -- 128 bit block size -- 128 bit key size -- CTR mode
// used for header encryption, thus the prefix 'he_'
// for now: just plain C -- AVX, SSE, NEON might follow
#define ROR64(x,r) (((x)>>(r))|((x)<<(64-(r))))
#define ROL64(x,r) (((x)<<(r))|((x)>>(64-(r))))
#define R64(x,y,k) (x=ROR64(x,8), x+=y, x^=k, y=ROL64(y,3), y^=x)
static int speck_encrypt_he (u64 *u, u64 *v, speck_context_t *ctx) {
u64 i, x=*u, y=*v;
for (i = 0; i < 32; i++)
R64 (x, y, ctx->key[i]);
*u = x; *v = y;
return 0;
}
int speck_he (unsigned char *out, const unsigned char *in, unsigned long long inlen,
const unsigned char *n, speck_context_t *ctx) {
u64 i, nonce[2], x, y, t;
unsigned char *block = malloc(16);
if (!inlen) {
free (block);
return 0;
}
nonce[0] = htole64 ( ((u64*)n)[0] );
nonce[1] = htole64 ( ((u64*)n)[1] );
t = 0;
while (inlen >= 16) {
x = nonce[1]; y = nonce[0]; nonce[0]++;
speck_encrypt_he (&x, &y, ctx);
((u64 *)out)[1+t] = htole64 (x ^ ((u64 *)in)[1+t]);
((u64 *)out)[0+t] = htole64 (y ^ ((u64 *)in)[0+t]);
t += 2;
inlen -= 16;
}
if (inlen > 0) {
x = nonce[1]; y = nonce[0];
speck_encrypt_he (&x, &y, ctx);
((u64 *)block)[1] = htole64 (x); ((u64 *)block)[0] = htole64 (y);
for (i = 0; i < inlen; i++)
out[i+8*t] = block[i] ^ in[i+8*t];
}
free(block);
return 0;
}
int speck_expand_key_he (const unsigned char *k, speck_context_t *ctx) {
u64 A, B;
u64 i;
A = htole64 ( ((u64 *)k)[0] );
B = htole64 ( ((u64 *)k)[1] );
for (i = 0; i < 32; i ++) {
ctx->key[i] = A;
R64 ( B, A, i);
}
return 1;
}
// code for testing -- to be removed when finished
/*
#include <stdio.h> // for testing
#include <string.h>
int speck_test () {
uint8_t key[32] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F };
uint8_t iv[16] = { 0x70, 0x6f, 0x6f, 0x6e, 0x65, 0x72, 0x2e, 0x20,
0x49, 0x6e, 0x20, 0x74, 0x68, 0x6f, 0x73, 0x65 };
uint8_t xv[16] = { 0x20, 0x6d, 0x61, 0x64, 0x65, 0x20, 0x69, 0x74,
0x20, 0x65, 0x71, 0x75, 0x69, 0x76, 0x61, 0x6c };
uint8_t pt[16] = { 0x00 };
// expected outcome (according to pp. 35 & 36 of Implementation Guide)
uint8_t ct[16] = { 0x43, 0x8f, 0x18, 0x9c, 0x8d, 0xb4, 0xee, 0x4e,
0x3e, 0xf5, 0xc0, 0x05, 0x04, 0x01, 0x09, 0x41 };
uint8_t xt[16] = { 0x18, 0x0d, 0x57, 0x5c, 0xdf, 0xfe, 0x60, 0x78,
0x65, 0x32, 0x78, 0x79, 0x51, 0x98, 0x5d, 0xa6 };
speck_context_t ctx;
speck_expand_key (key, &ctx);
#if defined (SPECK_CTX_BYVAL)
speck_ctr (pt, pt, 16, iv, ctx);
#else
speck_ctr (pt, pt, 16, iv, &ctx);
#endif
u64 i;
fprintf (stderr, "rk00: %016llx\n", ctx.key[0]);
fprintf (stderr, "rk33: %016llx\n", ctx.key[33]);
fprintf (stderr, "out : %016lx\n", *(uint64_t*)pt);
fprintf (stderr, "mem : " ); for (i=0; i < 16; i++) fprintf (stderr, "%02x ", pt[i]); fprintf (stderr, "\n");
int ret = 1;
for (i=0; i < 16; i++)
if (pt[i] != ct[i]) ret = 0;
memset (pt, 0, 16);
speck_expand_key_he (key, &ctx);
speck_he (pt, pt, 16, xv, &ctx);
fprintf (stderr, "rk00: %016llx\n", ctx.key[0]);
fprintf (stderr, "rk31: %016llx\n", ctx.key[31]);
fprintf (stderr, "out : %016lx\n", *(uint64_t*)pt);
fprintf (stderr, "mem : " ); for (i=0; i < 16; i++) fprintf (stderr, "%02x ", pt[i]); fprintf (stderr, "\n");
for (i=0; i < 16; i++)
if (pt[i] != xt[i]) ret = 0;
return (ret);
}
int main (int argc, char* argv[]) {
fprintf (stdout, "SPECK SELF TEST RESULT: %u\n", speck_test (0,NULL));
}
*/
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