Move checksum functions here. Add krb5_cksumsize function.

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@2071 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/krb5/checksum.c

@@ -8,11 +8,56 @@ struct checksum_type {
     void (*checksum)(void *, size_t, void *);
 };
 
+static void
+NULL_checksum(void *p, size_t len, void *result)
+{
+}
+
+static void
+MD4_checksum(void *p, size_t len, void *result)
+{
+    struct md4 m;
+    md4_init(&m);
+    md4_update(&m, p, len);
+    md4_finito(&m, result);
+}
+
+static void
+MD5_checksum(void *p, size_t len, void *result)
+{
+    struct md5 m;
+    md5_init(&m);
+    md5_update(&m, p, len);
+    md5_finito(&m, result);
+}
+
+static void
+SHA1_checksum(void *p, size_t len, void *result)
+{
+    struct sha m;
+    sha_init(&m);
+    sha_update(&m, p, len);
+    sha_finito(&m, result);
+}
+
+static void
+CRC_checksum(void *p, size_t len, void *result)
+{
+    u_int32_t crc;
+    unsigned char *r = result;
+    crc_init_table ();
+    crc = crc_update (p, len, 0);
+    r[0] = crc & 0xff;
+    r[1] = (crc >> 8)  & 0xff;
+    r[2] = (crc >> 16) & 0xff;
+    r[3] = (crc >> 24) & 0xff;
+}
+
 static struct checksum_type cm[] = {
-  { CKSUMTYPE_NONE,		 0,	krb5_NULL_checksum},
+  { CKSUMTYPE_NONE,		 0,	NULL_checksum},
-  { CKSUMTYPE_CRC32,		 4,	krb5_CRC_checksum},
+  { CKSUMTYPE_CRC32,		 4,	CRC_checksum},
-  { CKSUMTYPE_RSA_MD4,		16,	krb5_MD4_checksum},
+  { CKSUMTYPE_RSA_MD4,		16,	MD4_checksum},
-  { CKSUMTYPE_RSA_MD5,		16,	krb5_MD5_checksum}
+  { CKSUMTYPE_RSA_MD5,		16,	MD5_checksum}
 };
 
 static int num_ctypes = sizeof(cm) / sizeof(cm[0]);
@@ -27,6 +72,19 @@ find_checksum_type(int ctype)
     return NULL;
 }
 
+krb5_error_code
+krb5_cksumsize(krb5_context context,
+	       krb5_cksumtype type,
+	       size_t *size)
+{
+    struct checksum_type *c = find_checksum_type(type);
+    if(c == NULL)
+	return KRB5_PROG_SUMTYPE_NOSUPP;
+    
+    *size = c->checksumsize;
+    return 0;
+}
+
 krb5_error_code
 krb5_create_checksum (krb5_context context,
 		      krb5_cksumtype type,