1 files changed, 44 insertions, 0 deletions
diff --git a/sha-example.c b/sha-example.c
new file mode 100644
index 00000000..a4818460
--- /dev/null
+++ b/sha-example.c
@@ -0,0 +1,44 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <nettle/sha.h>
+
+#define BUF_SIZE 1000
+
+static void
+display_hex(unsigned length, uint8_t *data)
+{
+  static const char digits[16] = "0123456789abcdef";
+  unsigned i;
+
+  for (i = 0; i<length; i++)
+  {
+    uint8_t byte = data[i];
+    printf("%c%c ", digits[(byte / 16) & 0xf], digits[byte & 0xf]);
+  }
+  printf("\n");
+}
+
+int
+main(int argc, char **argv)
+{
+  struct sha1_ctx ctx;
+  uint8_t buffer[BUF_SIZE];
+  uint8_t digest[SHA1_DIGEST_SIZE];
+  
+  sha1_init(&ctx);
+  for (;;)
+  {
+    int done = fread(buffer, 1, sizeof(buffer), stdin);
+    sha1_update(&ctx, done, buffer);
+    if (done < sizeof(buffer))
+      break;
+  }
+  if (ferror(stdin))
+    return EXIT_FAILURE;
+
+  sha1_digest(&ctx, SHA1_DIGEST_SIZE, digest);
+
+  display_hex(SHA1_DIGEST_SIZE, digest);
+  return EXIT_SUCCESS;  
+}