crc/sha512: fix missing finalize part of sha512 hash

The sha512 implementation was broken, make an attempt at actually
making it work...

Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: axboe

crc/sha512.c

@@ -195,3 +195,60 @@ void fio_sha512_update(struct fio_sha512_ctx *sctx, const uint8_t *data,
 	/* erase our data */
 	memset(sctx->W, 0, sizeof(sctx->W));
 }
+
+void fio_sha512_final(struct fio_sha512_ctx *sctx)
+{
+	uint8_t *hash = sctx->buf;
+	static uint8_t padding[128] = { 0x80, };
+	unsigned int index, pad_len;
+	uint8_t bits[128];
+	uint64_t t2;
+	uint32_t t;
+	int i, j;
+
+        index = pad_len = t = i = j = 0;
+        t2 = 0;
+
+	/* Save number of bits */
+	t = sctx->count[0];
+	bits[15] = t; t>>=8;
+	bits[14] = t; t>>=8;
+	bits[13] = t; t>>=8;
+	bits[12] = t;
+	t = sctx->count[1];
+	bits[11] = t; t>>=8;
+	bits[10] = t; t>>=8;
+	bits[9 ] = t; t>>=8;
+	bits[8 ] = t;
+	t = sctx->count[2];
+	bits[7 ] = t; t>>=8;
+	bits[6 ] = t; t>>=8;
+	bits[5 ] = t; t>>=8;
+	bits[4 ] = t;
+	t = sctx->count[3];
+	bits[3 ] = t; t>>=8;
+	bits[2 ] = t; t>>=8;
+	bits[1 ] = t; t>>=8;
+	bits[0 ] = t;
+
+	/* Pad out to 112 mod 128. */
+	index = (sctx->count[0] >> 3) & 0x7f;
+	pad_len = (index < 112) ? (112 - index) : ((128+112) - index);
+	fio_sha512_update(sctx, padding, pad_len);
+
+	/* Append length (before padding) */
+	fio_sha512_update(sctx, bits, 16);
+
+	/* Store state in digest */
+	for (i = j = 0; i < 8; i++, j += 8) {
+		t2 = sctx->state[i];
+		hash[j+7] = (char)t2 & 0xff; t2>>=8;
+		hash[j+6] = (char)t2 & 0xff; t2>>=8;
+		hash[j+5] = (char)t2 & 0xff; t2>>=8;
+		hash[j+4] = (char)t2 & 0xff; t2>>=8;
+		hash[j+3] = (char)t2 & 0xff; t2>>=8;
+		hash[j+2] = (char)t2 & 0xff; t2>>=8;
+		hash[j+1] = (char)t2 & 0xff; t2>>=8;
+		hash[j  ] = (char)t2 & 0xff;
+	}
+}

crc/sha512.h

@@ -12,5 +12,6 @@ struct fio_sha512_ctx {
 
 void fio_sha512_init(struct fio_sha512_ctx *);
 void fio_sha512_update(struct fio_sha512_ctx *, const uint8_t *, unsigned int);
+void fio_sha512_final(struct fio_sha512_ctx *sctx);
 
 #endif

verify.c

@@ -537,6 +537,7 @@ static int verify_io_u_sha512(struct verify_header *hdr, struct vcont *vc)
 
 	fio_sha512_init(&sha512_ctx);
 	fio_sha512_update(&sha512_ctx, p, hdr->len - hdr_size(vc->td, hdr));
+	fio_sha512_final(&sha512_ctx);
 
 	if (!memcmp(vh->sha512, sha512_ctx.buf, sizeof(sha512)))
 		return 0;
@@ -1092,6 +1093,7 @@ static void fill_sha512(struct verify_header *hdr, void *p, unsigned int len)
 
 	fio_sha512_init(&sha512_ctx);
 	fio_sha512_update(&sha512_ctx, p, len);
+	fio_sha512_final(&sha512_ctx);
 }
 
 static void fill_sha256(struct verify_header *hdr, void *p, unsigned int len)