Add NIH SHA1 implementation mockup for porting

Mocked this up in host code to become familiar with the algorithm, and
to iron out most bugs before writing/porting to OpenCL.

For laughs, I switched sand-leek to use this implementation instead of
OpenSSL's. Performance decrease is about 90% with no change in CFLAGS,
and about 60% with -O3 instead of -O2. Of course this holds no weight, since
the implementation is only meant to be ported to OpenCL and run on graphics
cards where SIMD will skyrocket performance.

1 files changed, 18 insertions, 0 deletions

diff --git a/sha1.h b/sha1.h
new file mode 100644
index 0000000..37dea22
--- /dev/null
+++ b/sha1.h
@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+
+struct sha_data {
+	uint32_t a;
+	uint32_t b;
+	uint32_t c;
+	uint32_t d;
+	uint32_t e;
+	uint64_t len;
+	size_t data_len;
+	uint8_t data[64];
+};
+void sha_init(struct sha_data*);
+void sha_update(struct sha_data*, void *, size_t);
+void sha_final(unsigned char*, struct sha_data*);
+