commit f4e59021d2e17e97d06ff3da440a3190294b6d40
Author: cosmin.apreutesei <cosmin.apreutesei@gmail.com>
Date:   Wed Dec 18 17:38:06 2013 +0200

    inuit

diff --git a/sha2.lua b/sha2.lua
new file mode 100644
index 0000000..3b9dd66
--- /dev/null
+++ b/sha2.lua
@@ -0,0 +1,72 @@
+--sha256/384/512 hash and digest
+local ffi = require'ffi'
+local C = ffi.load'sha2'
+
+ffi.cdef[[
+enum {
+	SHA256_BLOCK_LENGTH  = 64,
+	SHA256_DIGEST_LENGTH = 32,
+	SHA384_BLOCK_LENGTH = 128,
+	SHA384_DIGEST_LENGTH = 48,
+	SHA512_BLOCK_LENGTH = 128,
+	SHA512_DIGEST_LENGTH = 64,
+};
+typedef struct _SHA256_CTX {
+	uint32_t	state[8];
+	uint64_t	bitcount;
+	uint8_t	buffer[SHA256_BLOCK_LENGTH];
+} SHA256_CTX;
+typedef struct _SHA512_CTX {
+	uint64_t	state[8];
+	uint64_t	bitcount[2];
+	uint8_t	buffer[SHA512_BLOCK_LENGTH];
+} SHA512_CTX;
+typedef SHA512_CTX SHA384_CTX;
+
+void SHA256_Init(SHA256_CTX *);
+void SHA256_Update(SHA256_CTX*, const uint8_t*, size_t);
+void SHA256_Final(uint8_t[SHA256_DIGEST_LENGTH], SHA256_CTX*);
+
+void SHA384_Init(SHA384_CTX*);
+void SHA384_Update(SHA384_CTX*, const uint8_t*, size_t);
+void SHA384_Final(uint8_t[SHA384_DIGEST_LENGTH], SHA384_CTX*);
+
+void SHA512_Init(SHA512_CTX*);
+void SHA512_Update(SHA512_CTX*, const uint8_t*, size_t);
+void SHA512_Final(uint8_t[SHA512_DIGEST_LENGTH], SHA512_CTX*);
+]]
+
+local function digest_function(Context, Init, Update, Final, DIGEST_LENGTH)
+	return function()
+		local ctx = ffi.new(Context)
+		local result = ffi.new('uint8_t[?]', DIGEST_LENGTH)
+		Init(ctx)
+		return function(data, size)
+			if data then
+				Update(ctx, data, size or #data)
+			else
+				Final(result, ctx)
+				return ffi.string(result, ffi.sizeof(result))
+			end
+		end
+	end
+end
+
+local function hash_function(digest_function)
+	return function(data, size)
+		local d = digest_function(); d(data, size); return d()
+	end
+end
+
+local M = {C = C}
+
+M.sha256_digest = digest_function(ffi.typeof'SHA256_CTX', C.SHA256_Init, C.SHA256_Update, C.SHA256_Final, C.SHA256_DIGEST_LENGTH)
+M.sha384_digest = digest_function(ffi.typeof'SHA384_CTX', C.SHA384_Init, C.SHA384_Update, C.SHA384_Final, C.SHA384_DIGEST_LENGTH)
+M.sha512_digest = digest_function(ffi.typeof'SHA512_CTX', C.SHA512_Init, C.SHA512_Update, C.SHA512_Final, C.SHA512_DIGEST_LENGTH)
+M.sha256 = hash_function(M.sha256_digest)
+M.sha384 = hash_function(M.sha384_digest)
+M.sha512 = hash_function(M.sha512_digest)
+
+if not ... then require'sha2_test' end
+
+return M
diff --git a/sha2.md b/sha2.md
new file mode 100644
index 0000000..7bbde18
--- /dev/null
+++ b/sha2.md
@@ -0,0 +1,37 @@
+---
+project: sha2
+tagline: SHA-256, SHA-384 and SHA-512 sum and digest
+---
+
+v1.0 | sha2-1.0 | LuaJIT 2
+
+## `local sha2 = require'sha2'`
+
+A ffi binding of Aaron Gifford's [SHA-2 implementation](http://www.aarongifford.com/computers/sha.html).
+
+----------------------------------- -----------------------------------
+`sha2.sha256(s[, size]) -> s`   \   Compute the SHA-2 hash of a string or a cdata buffer.
+`sha2.sha256(cdata, size) -> s` \   Return the  binary representation of the hash.
+`sha2.sha384(s[, size]) -> s`   \   To get the hex representation, use [glue.tohex].
+`sha2.sha384(cdata, size) -> s` \
+`sha2.sha512(s[, size]) -> s`   \
+`sha2.sha512(cdata, size) -> s`
+
+`sha2.sha256_digest() -> digest` \  Get a SHA-2 digest function that can consume multiple data chunks
+`sha2.sha384_digest() -> digest` \  until called with no arguments when it returns the final SHA hash.
+`sha2.sha512_digest() -> digest` \
+`digest(s[, size])`              \
+`digest(cdata, size)`            \
+`digest() -> s`
+
+----------------------------------- -----------------------------------
+
+## Building
+
+C sources and build scripts included. Binary also included.
+
+----
+_See also_: [md5](md5.html).
+
+[glue.tohex]: glue.html#tohex
+
diff --git a/sha2_test.lua b/sha2_test.lua
new file mode 100644
index 0000000..9ecbc8d
--- /dev/null
+++ b/sha2_test.lua
@@ -0,0 +1,42 @@
+local sha2 = require'sha2'
+local glue = require'glue'
+
+sha = {
+	SHA256 = function(s) return glue.tohex(sha2.sha256(s)) end,
+	SHA384 = function(s) return glue.tohex(sha2.sha384(s)) end,
+	SHA512 = function(s) return glue.tohex(sha2.sha512(s)) end,
+}
+
+for file in io.popen('ls media/sha2/*.dat'):lines() do
+	local name, ext = file:match('^(.-)%.(.*)$')
+	if ext == 'dat' then
+		local s = glue.readfile(file, 'rb')
+		local hashes = {}
+		do
+			local f = assert(io.open(name..'.info'))
+			do
+				local name, hash
+				for line in f:lines() do
+					if line:find'^SHA' then
+						name = line:match'^(SHA.?.?.?)'
+						hash = ''
+					elseif hash then
+						if #line == 0 then
+							hashes[name] = hash
+							hash = nil
+						elseif hash then
+							hash = hash .. line:match'^%s*(.-)%s*$'
+						end
+					end
+				end
+			end
+			f:close()
+		end
+
+		for k,v in pairs(hashes) do
+			local h = sha[k](s)
+			print(file, k..'x', #s, h == v and 'ok' or h .. ' ~= ' .. v)
+		end
+	end
+end
+