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From a2d9b1397d09ffc493816067ca8f1e39460e8264 Mon Sep 17 00:00:00 2001
From: Paul Barker <pa...@paulbarker.me.uk>
Date: Sat, 24 Oct 2015 20:15:18 +0100
Subject: [PATCH 2/3] sha256: Add sha256_to_string function
Signed-off-by: Paul Barker <pa...@paulbarker.me.uk>
---
libopkg/file_util.c | 28 +++-------------------------
libopkg/sha256.c | 17 +++++++++++++++++
libopkg/sha256.h | 3 +++
3 files changed, 23 insertions(+), 25 deletions(-)
diff --git a/libopkg/file_util.c b/libopkg/file_util.c
index cb3dbf0..864aedb 100644
--- a/libopkg/file_util.c
+++ b/libopkg/file_util.c
@@ -374,27 +374,13 @@ char *file_md5sum_alloc(const char *file_name)
#ifdef HAVE_SHA256
char *file_sha256sum_alloc(const char *file_name)
{
- static const int sha256sum_bin_len = 32;
- static const int sha256sum_hex_len = 64;
-
- static const unsigned char bin2hex[16] = {
- '0', '1', '2', '3',
- '4', '5', '6', '7',
- '8', '9', 'a', 'b',
- 'c', 'd', 'e', 'f'
- };
-
- int i, err;
+ int err;
FILE *file;
- char *sha256sum_hex;
- unsigned char sha256sum_bin[sha256sum_bin_len];
-
- sha256sum_hex = xcalloc(1, sha256sum_hex_len + 1);
+ unsigned char sha256sum_bin[32];
file = fopen(file_name, "r");
if (file == NULL) {
opkg_perror(ERROR, "Failed to open file %s", file_name);
- free(sha256sum_hex);
return NULL;
}
@@ -402,20 +388,12 @@ char *file_sha256sum_alloc(const char *file_name)
if (err) {
opkg_msg(ERROR, "Could't compute sha256sum for %s.\n", file_name);
fclose(file);
- free(sha256sum_hex);
return NULL;
}
fclose(file);
- for (i = 0; i < sha256sum_bin_len; i++) {
- sha256sum_hex[i * 2] = bin2hex[sha256sum_bin[i] >> 4];
- sha256sum_hex[i * 2 + 1] = bin2hex[sha256sum_bin[i] & 0xf];
- }
-
- sha256sum_hex[sha256sum_hex_len] = '\0';
-
- return sha256sum_hex;
+ return sha256_to_string(sha256sum_bin);
}
#endif
diff --git a/libopkg/sha256.c b/libopkg/sha256.c
index 0816858..5be0de3 100644
--- a/libopkg/sha256.c
+++ b/libopkg/sha256.c
@@ -29,6 +29,8 @@
#include <stddef.h>
#include <string.h>
+#include "xfuncs.h"
+
#if USE_UNLOCKED_IO
#include "unlocked-io.h"
#endif
@@ -517,3 +519,18 @@ void sha256_process_block(const void *buffer, size_t len,
h = ctx->state[7] += h;
}
}
+
+char *sha256_to_string(const void *sha256sum_bin)
+{
+ int i;
+ const char *src = (const char *)sha256sum_bin;
+ char *buf = xmalloc(65);
+
+ /* Print 4 bytes at a time. */
+ for (i = 0; i < 32; i += 4) {
+ sprintf(&buf[2*i], "%02hhx%02hhx%02hhx%02hhx",
+ src[i], src[i+1], src[i+2], src[i+3]);
+ }
+
+ return buf;
+}
diff --git a/libopkg/sha256.h b/libopkg/sha256.h
index 734ab54..0d1e9e5 100644
--- a/libopkg/sha256.h
+++ b/libopkg/sha256.h
@@ -85,6 +85,9 @@ extern int sha224_stream(FILE * stream, void *resblock);
extern void *sha256_buffer(const char *buffer, size_t len, void *resblock);
extern void *sha224_buffer(const char *buffer, size_t len, void *resblock);
+/* Convert a binary sha256sum value to an ASCII string. */
+char *sha256_to_string(const void *sha256sum_bin);
+
#ifdef __cplusplus
}
#endif
--
2.6.1
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