Properly initialize md5 hash seed
We started from 0, that's not entirely correct.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/md5.c b/md5.c
index cf1f814..8f9adb2 100644
--- a/md5.c
+++ b/md5.c
@@ -88,6 +88,14 @@
hash[3] += d;
}
+void md5_init(struct md5_ctx *mctx)
+{
+ mctx->hash[0] = 0x67452301;
+ mctx->hash[1] = 0xefcdab89;
+ mctx->hash[2] = 0x98badcfe;
+ mctx->hash[3] = 0x10325476;
+}
+
void md5_update(struct md5_ctx *mctx, const uint8_t *data, unsigned int len)
{
const uint32_t avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
diff --git a/md5.h b/md5.h
index 80fbcec..6747d30 100644
--- a/md5.h
+++ b/md5.h
@@ -23,5 +23,6 @@
};
extern void md5_update(struct md5_ctx *, const uint8_t *, unsigned int);
+extern void md5_init(struct md5_ctx *);
#endif
diff --git a/verify.c b/verify.c
index 5770b46..566c53c 100644
--- a/verify.c
+++ b/verify.c
@@ -187,7 +187,7 @@
.hash = hash,
};
- memset(md5_ctx.hash, 0, sizeof(hdr->md5_digest));
+ md5_init(&md5_ctx);
md5_update(&md5_ctx, p, hdr->len - sizeof(*hdr));
if (memcmp(hdr->md5_digest, md5_ctx.hash, sizeof(hash))) {
@@ -279,7 +279,7 @@
.hash = (uint32_t *) hdr->md5_digest,
};
- memset(md5_ctx.hash, 0, sizeof(hdr->md5_digest));
+ md5_init(&md5_ctx);
md5_update(&md5_ctx, p, len);
}