--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libtomcrypt/src/hashes/sha2/sha512_224.c	Fri Feb 09 21:44:05 2018 +0800
@@ -0,0 +1,130 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ */
+/**
+   @param sha512_224.c
+   SHA512/224 hash included in sha512.c
+*/
+
+#include "tomcrypt.h"
+
+#if defined(LTC_SHA512_224) && defined(LTC_SHA512)
+
+const struct ltc_hash_descriptor sha512_224_desc =
+{
+    "sha512-224",
+    15,
+    28,
+    128,
+
+    /* OID */
+   { 2, 16, 840, 1, 101, 3, 4, 2, 5,  },
+   9,
+
+    &sha512_224_init,
+    &sha512_process,
+    &sha512_224_done,
+    &sha512_224_test,
+    NULL
+};
+
+/**
+   Initialize the hash state
+   @param md   The hash state you wish to initialize
+   @return CRYPT_OK if successful
+*/
+int sha512_224_init(hash_state * md)
+{
+    LTC_ARGCHK(md != NULL);
+
+    md->sha512.curlen = 0;
+    md->sha512.length = 0;
+    md->sha512.state[0] = CONST64(0x8C3D37C819544DA2);
+    md->sha512.state[1] = CONST64(0x73E1996689DCD4D6);
+    md->sha512.state[2] = CONST64(0x1DFAB7AE32FF9C82);
+    md->sha512.state[3] = CONST64(0x679DD514582F9FCF);
+    md->sha512.state[4] = CONST64(0x0F6D2B697BD44DA8);
+    md->sha512.state[5] = CONST64(0x77E36F7304C48942);
+    md->sha512.state[6] = CONST64(0x3F9D85A86A1D36C8);
+    md->sha512.state[7] = CONST64(0x1112E6AD91D692A1);
+    return CRYPT_OK;
+}
+
+/**
+   Terminate the hash to get the digest
+   @param md  The hash state
+   @param out [out] The destination of the hash (48 bytes)
+   @return CRYPT_OK if successful
+*/
+int sha512_224_done(hash_state * md, unsigned char *out)
+{
+   unsigned char buf[64];
+
+   LTC_ARGCHK(md  != NULL);
+   LTC_ARGCHK(out != NULL);
+
+    if (md->sha512.curlen >= sizeof(md->sha512.buf)) {
+       return CRYPT_INVALID_ARG;
+    }
+
+   sha512_done(md, buf);
+   XMEMCPY(out, buf, 28);
+#ifdef LTC_CLEAN_STACK
+   zeromem(buf, sizeof(buf));
+#endif
+   return CRYPT_OK;
+}
+
+/**
+  Self-test the hash
+  @return CRYPT_OK if successful, CRYPT_NOP if self-tests have been disabled
+*/
+int  sha512_224_test(void)
+{
+ #ifndef LTC_TEST
+    return CRYPT_NOP;
+ #else
+  static const struct {
+      const char *msg;
+      unsigned char hash[28];
+  } tests[] = {
+    { "abc",
+      { 0x46, 0x34, 0x27, 0x0F, 0x70, 0x7B, 0x6A, 0x54,
+        0xDA, 0xAE, 0x75, 0x30, 0x46, 0x08, 0x42, 0xE2,
+        0x0E, 0x37, 0xED, 0x26, 0x5C, 0xEE, 0xE9, 0xA4,
+        0x3E, 0x89, 0x24, 0xAA }
+    },
+    { "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu",
+      { 0x23, 0xFE, 0xC5, 0xBB, 0x94, 0xD6, 0x0B, 0x23,
+        0x30, 0x81, 0x92, 0x64, 0x0B, 0x0C, 0x45, 0x33,
+        0x35, 0xD6, 0x64, 0x73, 0x4F, 0xE4, 0x0E, 0x72,
+        0x68, 0x67, 0x4A, 0xF9 }
+    },
+  };
+
+  int i;
+  unsigned char tmp[28];
+  hash_state md;
+
+  for (i = 0; i < (int)(sizeof(tests) / sizeof(tests[0])); i++) {
+      sha512_224_init(&md);
+      sha512_224_process(&md, (unsigned char*)tests[i].msg, (unsigned long)strlen(tests[i].msg));
+      sha512_224_done(&md, tmp);
+      if (compare_testvector(tmp, sizeof(tmp), tests[i].hash, sizeof(tests[i].hash), "SHA512-224", i)) {
+         return CRYPT_FAIL_TESTVECTOR;
+      }
+  }
+  return CRYPT_OK;
+ #endif
+}
+
+#endif /* defined(LTC_SHA384) && defined(LTC_SHA512) */
+
+/* ref:         $Format:%D$ */
+/* git commit:  $Format:%H$ */
+/* commit time: $Format:%ai$ */