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// 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/
#ifdef __APPLE__
#include <libkern/OSByteOrder.h>
#define htole64(x) OSSwapHostToLittleInt64(x)
#endif
#define u64 uint64_t
#if defined (__AVX2__)
#define SPECK_ALIGNED_CTX 32
#include <immintrin.h>
#define u256 __m256i
typedef struct {
u256 rk[34];
u64 key[34];
} speck_context_t;
#elif defined (__SSE4_2__)
#define SPECK_ALIGNED_CTX 16
#define SPECK_CTX_BYVAL 1
#include <immintrin.h>
#define u128 __m128i
typedef struct {
u128 rk[34];
u64 key[34];
} speck_context_t;
#elif defined (__ARM_NEON)
#include <arm_neon.h>
#define u128 uint64x2_t
typedef struct {
u128 rk[34];
u64 key[34];
} speck_context_t;
#else
typedef struct {
u64 key[34];
} speck_context_t;
#endif
int speck_ctr (unsigned char *out, const unsigned char *in, unsigned long long inlen,
const unsigned char *n,
#if defined (SPECK_CTX_BYVAL)
speck_context_t ctx);
#else
speck_context_t *ctx);
#endif
int speck_expand_key (const unsigned char *k, speck_context_t *ctx);