// cipher SPECK -- 128 bit block size -- 256 bit key size // 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 #include #include #ifdef __SSE4_2__ // SSE support ---------------------------------------------------- #include #define u32 unsigned #define u64 unsigned long long #define u128 __m128i #define LCS(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)) typedef struct { u128 rk[34]; u64 key[34]; } speck_context_t; 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]; 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_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; } 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; } #else // (close to) C reference code -------------------------------------------- #define u64 uint64_t #define ROR64(x,r) (((x)>>(r))|((x)<<(64-(r)))) #define ROL64(x,r) (((x)<<(r))|((x)>>(64-(r)))) #define R(x,y,k) (x=ROR64(x,8), x+=y, x^=k, y=ROL64(y,3), y^=x) typedef struct { u64 key[34]; } speck_context_t; 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 // SSE, C ref 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 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 }; speck_context_t ctx; speck_expand_key (key, &ctx); speck_ctr (pt, pt, 16, iv, ctx); 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; return (ret); } /* int main (int argc, char* argv[]) { fprintf (stdout, "SPECK SELF TEST RESULT: %u\n", speck_test (0,NULL)); } */