packages/shasum: Add a sha256sum utility with little dependencies

    To avoid weird requirements add a sha256sum tool to OpenEmbedded
    directly. This will be part of the OE manifest and be guarded
    by the monotone OE trust chain.

1 files changed, 60 insertions, 0 deletions

diff --git a/packages/shasum/files/main.c b/packages/shasum/files/main.c
new file mode 100644
index 0000000000..0748a94f3a
--- /dev/null
+++ b/packages/shasum/files/main.c
@@ -0,0 +1,60 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "mhash_sha256.h"
+
+/*
+ * from driver.c of mhash
+ */
+static const char hexconvtab[] = "0123456789abcdef";
+
+static char *
+bin2hex(const unsigned char *old, const size_t oldlen, size_t * newlen)
+{
+    unsigned char *new = NULL;
+    int i, j;
+
+    new = (char *) malloc(oldlen * 2 * sizeof(char) + 1);
+    if (!new)
+        return (new);
+
+    for (i = j = 0; i < oldlen; i++) {
+        new[j++] = hexconvtab[old[i] >> 4];
+        new[j++] = hexconvtab[old[i] & 15];
+    }
+    new[j] = '\0';
+
+    if (newlen)
+        *newlen = oldlen * 2 * sizeof(char);
+
+    return (new);
+}
+
+
+int main(int argc, char** argv)
+{
+    FILE *file;
+    size_t n;
+    SHA256_CTX ctx;
+    unsigned char buf[1024];
+    byte output[33];
+
+    if ( argc <= 1 ) {
+        return EXIT_FAILURE;
+    }
+
+    if ( (file=fopen(argv[1], "rb")) == NULL ) {
+        return EXIT_FAILURE;
+    }
+
+    sha256_init(&ctx);
+
+    while ( (n=fread( buf, 1, sizeof(buf), file)) > 0 )
+        sha256_update(&ctx, buf, n );
+
+    sha256_final(&ctx);
+    sha256_digest(&ctx, output);
+
+    printf("%s ?%s\n", bin2hex(output, 32, &n), argv[1]);
+    return EXIT_SUCCESS;
+}