Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcrypto/crypto/../../libssl/src/crypto/chacha/chacha.c	Lines:	26	26	100.0 %
Date:	2016-12-06	Branches:	6	6	100.0 %


/* $OpenBSD: chacha.c,v 1.7 2015/12/09 14:07:55 bcook Exp $ */
/*
 * Copyright (c) 2014 Joel Sing <jsing@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <stdint.h>

#include <openssl/chacha.h>

#include "chacha-merged.c"

void
ChaCha_set_key(ChaCha_ctx *ctx, const unsigned char *key, uint32_t keybits)
{
	chacha_keysetup((chacha_ctx *)ctx, key, keybits);
	ctx->unused = 0;
}

void
ChaCha_set_iv(ChaCha_ctx *ctx, const unsigned char *iv,
    const unsigned char *counter)
{
	chacha_ivsetup((chacha_ctx *)ctx, iv, counter);
	ctx->unused = 0;
}

void
ChaCha(ChaCha_ctx *ctx, unsigned char *out, const unsigned char *in, size_t len)
{
	unsigned char *k;
	int i, l;

	/* Consume remaining keystream, if any exists. */
	if (ctx->unused > 0) {
		k = ctx->ks + 64 - ctx->unused;
		l = (len > ctx->unused) ? ctx->unused : len;
		for (i = 0; i < l; i++)
			*(out++) = *(in++) ^ *(k++);
		ctx->unused -= l;
		len -= l;
	}

	chacha_encrypt_bytes((chacha_ctx *)ctx, in, out, (uint32_t)len);
}

void
CRYPTO_chacha_20(unsigned char *out, const unsigned char *in, size_t len,
    const unsigned char key[32], const unsigned char iv[8], uint64_t counter)
{
	struct chacha_ctx ctx;

	/*
	 * chacha_ivsetup expects the counter to be in u8. Rather than
	 * converting size_t to u8 and then back again, pass a counter of
	 * NULL and manually assign it afterwards.
	 */
	chacha_keysetup(&ctx, key, 256);
	chacha_ivsetup(&ctx, iv, NULL);
	if (counter != 0) {
		ctx.input[12] = (uint32_t)counter;
		ctx.input[13] = (uint32_t)(counter >> 32);
	}

	chacha_encrypt_bytes(&ctx, in, out, (uint32_t)len);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: chacha.c,v 1.7 2015/12/09 14:07:55 bcook Exp $ */
2			/*
3			* Copyright (c) 2014 Joel Sing <jsing@openbsd.org>
4			*
5			* Permission to use, copy, modify, and distribute this software for any
6			* purpose with or without fee is hereby granted, provided that the above
7			* copyright notice and this permission notice appear in all copies.
8			*
9			* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10			* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11			* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12			* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13			* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14			* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15			* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16			*/
17
18			#include <stdint.h>
19
20			#include <openssl/chacha.h>
21
22			#include "chacha-merged.c"
23
24			void
25			ChaCha_set_key(ChaCha_ctx ctx, const unsigned char key, uint32_t keybits)
26		32	{
27		32	chacha_keysetup((chacha_ctx *)ctx, key, keybits);
28		32	ctx->unused = 0;
29		32	}
30
31			void
32			ChaCha_set_iv(ChaCha_ctx ctx, const unsigned char iv,
33			const unsigned char *counter)
34		32	{
35		32	chacha_ivsetup((chacha_ctx *)ctx, iv, counter);
36		32	ctx->unused = 0;
37		32	}
38
39			void
40			ChaCha(ChaCha_ctx ctx, unsigned char out, const unsigned char *in, size_t len)
41		584	{
42			unsigned char *k;
43			int i, l;
44
45			/* Consume remaining keystream, if any exists. */
46	✓✓	584	if (ctx->unused > 0) {
47		552	k = ctx->ks + 64 - ctx->unused;
48		552	l = (len > ctx->unused) ? ctx->unused : len;
49	✓✓	1320	for (i = 0; i < l; i++)
50		768	(out++) = (in++) ^ *(k++);
51		552	ctx->unused -= l;
52		552	len -= l;
53			}
54
55		584	chacha_encrypt_bytes((chacha_ctx *)ctx, in, out, (uint32_t)len);
56		584	}
57
58			void
59			CRYPTO_chacha_20(unsigned char out, const unsigned char in, size_t len,
60			const unsigned char key[32], const unsigned char iv[8], uint64_t counter)
61		413	{
62			struct chacha_ctx ctx;
63
64			/*
65			* chacha_ivsetup expects the counter to be in u8. Rather than
66			* converting size_t to u8 and then back again, pass a counter of
67			* NULL and manually assign it afterwards.
68			*/
69		413	chacha_keysetup(&ctx, key, 256);
70		413	chacha_ivsetup(&ctx, iv, NULL);
71	✓✓	413	if (counter != 0) {
72		171	ctx.input[12] = (uint32_t)counter;
73		171	ctx.input[13] = (uint32_t)(counter >> 32);
74			}
75
76		413	chacha_encrypt_bytes(&ctx, in, out, (uint32_t)len);
77		413	}