core/crypto/sm3: API cleanup

- sm3.Sm3_Context -> sm3.Context

vendor/botan/sm3/sm3.odin

@@ -32,11 +32,10 @@ hash_string :: proc "contextless" (data: string) -> [DIGEST_SIZE]byte {
 // computed hash
 hash_bytes :: proc "contextless" (data: []byte) -> [DIGEST_SIZE]byte {
     hash: [DIGEST_SIZE]byte
-    ctx: botan.hash_t
-    botan.hash_init(&ctx, botan.HASH_SM3, 0)
-    botan.hash_update(ctx, len(data) == 0 ? nil : &data[0], uint(len(data)))
-    botan.hash_final(ctx, &hash[0])
-    botan.hash_destroy(ctx)
+    ctx: Context
+    init(&ctx)
+    update(&ctx, data)
+    final(&ctx, hash[:])
     return hash
 }
 
@@ -52,31 +51,29 @@ hash_string_to_buffer :: proc(data: string, hash: []byte) {
 // It requires that the destination buffer is at least as big as the digest size
 hash_bytes_to_buffer :: proc(data, hash: []byte) {
     assert(len(hash) >= DIGEST_SIZE, "Size of destination buffer is smaller than the digest size")
-    ctx: botan.hash_t
-    botan.hash_init(&ctx, botan.HASH_SM3, 0)
-    botan.hash_update(ctx, len(data) == 0 ? nil : &data[0], uint(len(data)))
-    botan.hash_final(ctx, &hash[0])
-    botan.hash_destroy(ctx)
+    ctx: Context
+    init(&ctx)
+    update(&ctx, data)
+    final(&ctx, hash[:])
 }
 
 // hash_stream will read the stream in chunks and compute a
 // hash from its contents
 hash_stream :: proc(s: io.Stream) -> ([DIGEST_SIZE]byte, bool) {
     hash: [DIGEST_SIZE]byte
-    ctx: botan.hash_t
-    botan.hash_init(&ctx, botan.HASH_SM3, 0)
+    ctx: Context
+    init(&ctx)
     buf := make([]byte, 512)
     defer delete(buf)
     i := 1
     for i > 0 {
         i, _ = io.read(s, buf)
         if i > 0 {
-            botan.hash_update(ctx, len(buf) == 0 ? nil : &buf[0], uint(i))
-        } 
+            update(&ctx, buf[:i])
+        }
     }
-    botan.hash_final(ctx, &hash[0])
-    botan.hash_destroy(ctx)
-    return hash, true 
+    final(&ctx, hash[:])
+    return hash, true
 }
 
 // hash_file will read the file provided by the given handle
@@ -105,17 +102,17 @@ hash :: proc {
     Low level API
 */
 
-Sm3_Context :: botan.hash_t
+Context :: botan.hash_t
 
-init :: proc "contextless" (ctx: ^botan.hash_t) {
+init :: proc "contextless" (ctx: ^Context) {
     botan.hash_init(ctx, botan.HASH_SM3, 0)
 }
 
-update :: proc "contextless" (ctx: ^botan.hash_t, data: []byte) {
+update :: proc "contextless" (ctx: ^Context, data: []byte) {
     botan.hash_update(ctx^, len(data) == 0 ? nil : &data[0], uint(len(data)))
 }
 
-final :: proc "contextless" (ctx: ^botan.hash_t, hash: []byte) {
+final :: proc "contextless" (ctx: ^Context, hash: []byte) {
     botan.hash_final(ctx^, &hash[0])
     botan.hash_destroy(ctx^)
 }