Make SHA256 state memcpy()'able again.

Related-to: #742
Fixes: 874e095 ("SHA-256 & SHA-224 x86")
Signed-off-by: Steffen Jaeckel <s@jaeckel.eu>

Author: sjaeckel

src/hashes/sha2/sha256.c

@@ -233,7 +233,22 @@ static int s_sha256_compress(hash_state * md, const unsigned char *buf)
    @param inlen  The length of the data (octets)
    @return CRYPT_OK if successful
 */
-HASH_PROCESS(sha256_c_process,s_sha256_compress, sha256, 64)
+static HASH_PROCESS(s_sha256_c_process,s_sha256_compress, sha256, 64)
+
+static LTC_INLINE void s_sha256_c_fixup_state(hash_state * md)
+{
+   ulong32 *state = LTC_ALIGN_BUF(md->sha256.state_buf, 16);
+   if (state != md->sha256.state) {
+      XMEMMOVE(state, md->sha256.state, 8 * sizeof(ulong32));
+      md->sha256.state = state;
+   }
+}
+
+int sha256_c_process (hash_state * md, const unsigned char *in, unsigned long inlen)
+{
+   s_sha256_c_fixup_state(md);
+   return s_sha256_c_process(md, in, inlen);
+}
 
 /**
    Terminate the hash to get the digest
@@ -252,6 +267,7 @@ int sha256_c_done(hash_state * md, unsigned char *out)
        return CRYPT_INVALID_ARG;
     }
 
+    s_sha256_c_fixup_state(md);
 
     /* increase the length of the message */
     md->sha256.length += md->sha256.curlen * 8;

src/hashes/sha2/sha256_x86.c

@@ -265,7 +265,22 @@ static int s_sha256_compress(hash_state * md, const unsigned char *buf)
    @param inlen  The length of the data (octets)
    @return CRYPT_OK if successful
 */
-HASH_PROCESS(sha256_x86_process,s_sha256_x86_compress, sha256, 64)
+static HASH_PROCESS(s_sha256_x86_process,s_sha256_x86_compress, sha256, 64)
+
+static LTC_INLINE void s_sha256_x86_fixup_state(hash_state * md)
+{
+   ulong32 *state = LTC_ALIGN_BUF(md->sha256.state_buf, 16);
+   if (state != md->sha256.state) {
+      XMEMMOVE(state, md->sha256.state, 8 * sizeof(ulong32));
+      md->sha256.state = state;
+   }
+}
+
+int sha256_x86_process (hash_state * md, const unsigned char *in, unsigned long inlen)
+{
+   s_sha256_x86_fixup_state(md);
+   return s_sha256_x86_process(md, in, inlen);
+}
 
 /**
    Terminate the hash to get the digest
@@ -284,6 +299,7 @@ int sha256_x86_done(hash_state * md, unsigned char *out)
        return CRYPT_INVALID_ARG;
     }
 
+    s_sha256_x86_fixup_state(md);
 
     /* increase the length of the message */
     md->sha256.length += md->sha256.curlen * 8;