Code reorganization

include/speck.h

@@ -0,0 +1,71 @@
+// 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/
+
+
+#ifndef SPECK_H
+#define SPECK_H
+
+#include <stdint.h>
+#define u32 uint32_t
+#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);
+
+
+int speck_he (unsigned char *out, const unsigned char *in, unsigned long long inlen,
+              const unsigned char *n, speck_context_t *ctx);
+
+
+int speck_expand_key_he (const unsigned char *k, speck_context_t *ctx);
+
+
+#endif