nkiss

commit 049d4dcd29fb8bf2e0455b52b08e2a32a4325c66
parent d13b760aa41cf2b2ef105e5a5d6492351a377c1a
Author: Nihal Jere <nihal@nihaljere.xyz>
Date:   Sat, 20 Feb 2021 21:43:28 -0600

sha256.*: add sha256_file

Diffstat:
M
sha256.c
 | 
25
+++++++++++++++++++++++++
M
sha256.h
 | 
2
++

2 files changed, 27 insertions(+), 0 deletions(-)
diff --git a/sha256.c b/sha256.c
@@ -194,3 +194,28 @@ sha256_tostr(char *dest, const char *src)
 
     return dest[64] = '\0';
 }
+
+int 
+sha256_file(char *path, char *dest)
+{
+    FILE *f;
+    struct sha256 ctx;
+    char buf[BUFSIZ];
+    int n;
+
+    if ((f = fopen(path, "r")) == NULL)
+        return -1;
+
+    sha256_init(&ctx);
+    while ((n = fread(buf, sizeof(char), BUFSIZ, f)))
+        sha256_update(&ctx, buf, n);
+
+    if (ferror(f)) {
+        fclose(f);
+        return -1;
+    }
+
+    sha256_sum(&ctx, dest);
+    fclose(f);
+    return 0;
+}
diff --git a/sha256.h b/sha256.h
@@ -20,3 +20,5 @@ void sha256_sum(void *ctx, uint8_t md[SHA256_DIGEST_LENGTH]);
 int sha256_fromstr(char *dest, const char *src);
 /* convert 32 byte array to hex string */
 int sha256_tostr(char *dest, const char *src);
+/* sha256 entire file at path */
+int sha256_file(char *path, char *dest);