sha2 allow external access to some macros and the K array

sha2.c

@@ -36,16 +36,6 @@
 
 #include "sha2.h"
 
-#define SHFR(x, n)    (x >> n)
-#define ROTR(x, n)   ((x >> n) | (x << ((sizeof(x) << 3) - n)))
-#define CH(x, y, z)  ((x & y) ^ (~x & z))
-#define MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
-
-#define SHA256_F1(x) (ROTR(x,  2) ^ ROTR(x, 13) ^ ROTR(x, 22))
-#define SHA256_F2(x) (ROTR(x,  6) ^ ROTR(x, 11) ^ ROTR(x, 25))
-#define SHA256_F3(x) (ROTR(x,  7) ^ ROTR(x, 18) ^ SHFR(x,  3))
-#define SHA256_F4(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHFR(x, 10))
-
 #define UNPACK32(x, str)                      \
 {                                             \
     *((str) + 3) = (uint8_t) ((x)      );       \

sha2.h

@@ -41,13 +41,25 @@
 #define SHA256_DIGEST_SIZE ( 256 / 8)
 #define SHA256_BLOCK_SIZE  ( 512 / 8)
 
+#define SHFR(x, n)    (x >> n)
+#define ROTR(x, n)   ((x >> n) | (x << ((sizeof(x) << 3) - n)))
+#define CH(x, y, z)  ((x & y) ^ (~x & z))
+#define MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
+
+#define SHA256_F1(x) (ROTR(x,  2) ^ ROTR(x, 13) ^ ROTR(x, 22))
+#define SHA256_F2(x) (ROTR(x,  6) ^ ROTR(x, 11) ^ ROTR(x, 25))
+#define SHA256_F3(x) (ROTR(x,  7) ^ ROTR(x, 18) ^ SHFR(x,  3))
+#define SHA256_F4(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHFR(x, 10))
+
 typedef struct {
     unsigned int tot_len;
     unsigned int len;
     unsigned char block[2 * SHA256_BLOCK_SIZE];
     uint32_t h[8];
 } sha256_ctx;
 
+extern uint32_t sha256_k[64];
+
 void sha256_init(sha256_ctx * ctx);
 void sha256_update(sha256_ctx *ctx, const unsigned char *message,
                    unsigned int len);