/src/openssl/crypto/hmac/hmac.c

Source (jump to first uncovered line)
/*
 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "internal/cryptlib.h"
#include <openssl/hmac.h>
#include <openssl/opensslconf.h>
#include "hmac_lcl.h"

int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len,
                 const EVP_MD *md, ENGINE *impl)
{
    int i, j, reset = 0;
    unsigned char pad[HMAC_MAX_MD_CBLOCK];

    /* If we are changing MD then we must have a key */
    if (md != NULL && md != ctx->md && (key == NULL || len < 0))
        return 0;

    if (md != NULL) {
        reset = 1;
        ctx->md = md;
    } else if (ctx->md) {
        md = ctx->md;
    } else {
        return 0;
    }

    if (key != NULL) {
        reset = 1;
        j = EVP_MD_block_size(md);
        if (!ossl_assert(j <= (int)sizeof(ctx->key)))
            goto err;
        if (j < len) {
            if (!EVP_DigestInit_ex(ctx->md_ctx, md, impl))
                goto err;
            if (!EVP_DigestUpdate(ctx->md_ctx, key, len))
                goto err;
            if (!EVP_DigestFinal_ex(ctx->md_ctx, ctx->key,
                                    &ctx->key_length))
                goto err;
        } else {
            if (len < 0 || len > (int)sizeof(ctx->key))
                return 0;
            memcpy(ctx->key, key, len);
            ctx->key_length = len;
        }
        if (ctx->key_length != HMAC_MAX_MD_CBLOCK)
            memset(&ctx->key[ctx->key_length], 0,
                   HMAC_MAX_MD_CBLOCK - ctx->key_length);
    }

    if (reset) {
        for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++)
            pad[i] = 0x36 ^ ctx->key[i];
        if (!EVP_DigestInit_ex(ctx->i_ctx, md, impl))
            goto err;
        if (!EVP_DigestUpdate(ctx->i_ctx, pad, EVP_MD_block_size(md)))
            goto err;

        for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++)
            pad[i] = 0x5c ^ ctx->key[i];
        if (!EVP_DigestInit_ex(ctx->o_ctx, md, impl))
            goto err;
        if (!EVP_DigestUpdate(ctx->o_ctx, pad, EVP_MD_block_size(md)))
            goto err;
    }
    if (!EVP_MD_CTX_copy_ex(ctx->md_ctx, ctx->i_ctx))
        goto err;
    return 1;
 err:
    return 0;
}

#if OPENSSL_API_COMPAT < 0x10100000L
int HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md)
{
    if (key && md)
        HMAC_CTX_reset(ctx);
    return HMAC_Init_ex(ctx, key, len, md, NULL);
}
#endif

int HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len)
{
    if (!ctx->md)
        return 0;
    return EVP_DigestUpdate(ctx->md_ctx, data, len);
}

int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len)
{
    unsigned int i;
    unsigned char buf[EVP_MAX_MD_SIZE];

    if (!ctx->md)
        goto err;

    if (!EVP_DigestFinal_ex(ctx->md_ctx, buf, &i))
        goto err;
    if (!EVP_MD_CTX_copy_ex(ctx->md_ctx, ctx->o_ctx))
        goto err;
    if (!EVP_DigestUpdate(ctx->md_ctx, buf, i))
        goto err;
    if (!EVP_DigestFinal_ex(ctx->md_ctx, md, len))
        goto err;
    return 1;
 err:
    return 0;
}

size_t HMAC_size(const HMAC_CTX *ctx)
{
    int size = EVP_MD_size((ctx)->md);

    return (size < 0) ? 0 : size;
}

HMAC_CTX *HMAC_CTX_new(void)
{
    HMAC_CTX *ctx = OPENSSL_zalloc(sizeof(HMAC_CTX));

    if (ctx != NULL) {
        if (!HMAC_CTX_reset(ctx)) {
            HMAC_CTX_free(ctx);
            return NULL;
        }
    }
    return ctx;
}

static void hmac_ctx_cleanup(HMAC_CTX *ctx)
{
    EVP_MD_CTX_reset(ctx->i_ctx);
    EVP_MD_CTX_reset(ctx->o_ctx);
    EVP_MD_CTX_reset(ctx->md_ctx);
    ctx->md = NULL;
    ctx->key_length = 0;
    OPENSSL_cleanse(ctx->key, sizeof(ctx->key));
}

void HMAC_CTX_free(HMAC_CTX *ctx)
{
    if (ctx != NULL) {
        hmac_ctx_cleanup(ctx);
        EVP_MD_CTX_free(ctx->i_ctx);
        EVP_MD_CTX_free(ctx->o_ctx);
        EVP_MD_CTX_free(ctx->md_ctx);
        OPENSSL_free(ctx);
    }
}

static int hmac_ctx_alloc_mds(HMAC_CTX *ctx)
{
    if (ctx->i_ctx == NULL)
        ctx->i_ctx = EVP_MD_CTX_new();
    if (ctx->i_ctx == NULL)
        return 0;
    if (ctx->o_ctx == NULL)
        ctx->o_ctx = EVP_MD_CTX_new();
    if (ctx->o_ctx == NULL)
        return 0;
    if (ctx->md_ctx == NULL)
        ctx->md_ctx = EVP_MD_CTX_new();
    if (ctx->md_ctx == NULL)
        return 0;
    return 1;
}

int HMAC_CTX_reset(HMAC_CTX *ctx)
{
    hmac_ctx_cleanup(ctx);
    if (!hmac_ctx_alloc_mds(ctx)) {
        hmac_ctx_cleanup(ctx);
        return 0;
    }
    return 1;
}

int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx)
{
    if (!hmac_ctx_alloc_mds(dctx))
        goto err;
    if (!EVP_MD_CTX_copy_ex(dctx->i_ctx, sctx->i_ctx))
        goto err;
    if (!EVP_MD_CTX_copy_ex(dctx->o_ctx, sctx->o_ctx))
        goto err;
    if (!EVP_MD_CTX_copy_ex(dctx->md_ctx, sctx->md_ctx))
        goto err;
    memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK);
    dctx->key_length = sctx->key_length;
    dctx->md = sctx->md;
    return 1;
 err:
    hmac_ctx_cleanup(dctx);
    return 0;
}

unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len,
                    const unsigned char *d, size_t n, unsigned char *md,
                    unsigned int *md_len)
{
    HMAC_CTX *c = NULL;
    static unsigned char m[EVP_MAX_MD_SIZE];
    static const unsigned char dummy_key[1] = {'\0'};

    if (md == NULL)
        md = m;
    if ((c = HMAC_CTX_new()) == NULL)
        goto err;

    /* For HMAC_Init_ex, NULL key signals reuse. */
    if (key == NULL && key_len == 0) {
        key = dummy_key;
    }

    if (!HMAC_Init_ex(c, key, key_len, evp_md, NULL))
        goto err;
    if (!HMAC_Update(c, d, n))
        goto err;
    if (!HMAC_Final(c, md, md_len))
        goto err;
    HMAC_CTX_free(c);
    return md;
 err:
    HMAC_CTX_free(c);
    return NULL;
}

void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags)
{
    EVP_MD_CTX_set_flags(ctx->i_ctx, flags);
    EVP_MD_CTX_set_flags(ctx->o_ctx, flags);
    EVP_MD_CTX_set_flags(ctx->md_ctx, flags);
}

const EVP_MD *HMAC_CTX_get_md(const HMAC_CTX *ctx)
{
    return ctx->md;
}

Coverage Report

Created: 2018-08-29 13:53

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
3		*
4		* Licensed under the OpenSSL license (the "License"). You may not use
5		* this file except in compliance with the License. You can obtain a copy
6		* in the file LICENSE in the source distribution or at
7		* https://www.openssl.org/source/license.html
8		*/
9
10		#include <stdio.h>
11		#include <stdlib.h>
12		#include <string.h>
13		#include "internal/cryptlib.h"
14		#include <openssl/hmac.h>
15		#include <openssl/opensslconf.h>
16		#include "hmac_lcl.h"
17
18		int HMAC_Init_ex(HMAC_CTX ctx, const void key, int len,
19		const EVP_MD md, ENGINE impl)
20	0	{
21	0	int i, j, reset = 0;
22	0	unsigned char pad[HMAC_MAX_MD_CBLOCK];
23	0
24	0	/* If we are changing MD then we must have a key */
25	0	if (md != NULL && md != ctx->md && (key == NULL \|\| len < 0))
26	0	return 0;
27	0
28	0	if (md != NULL) {
29	0	reset = 1;
30	0	ctx->md = md;
31	0	} else if (ctx->md) {
32	0	md = ctx->md;
33	0	} else {
34	0	return 0;
35	0	}
36	0
37	0	if (key != NULL) {
38	0	reset = 1;
39	0	j = EVP_MD_block_size(md);
40	0	if (!ossl_assert(j <= (int)sizeof(ctx->key)))
41	0	goto err;
42	0	if (j < len) {
43	0	if (!EVP_DigestInit_ex(ctx->md_ctx, md, impl))
44	0	goto err;
45	0	if (!EVP_DigestUpdate(ctx->md_ctx, key, len))
46	0	goto err;
47	0	if (!EVP_DigestFinal_ex(ctx->md_ctx, ctx->key,
48	0	&ctx->key_length))
49	0	goto err;
50	0	} else {
51	0	if (len < 0 \|\| len > (int)sizeof(ctx->key))
52	0	return 0;
53	0	memcpy(ctx->key, key, len);
54	0	ctx->key_length = len;
55	0	}
56	0	if (ctx->key_length != HMAC_MAX_MD_CBLOCK)
57	0	memset(&ctx->key[ctx->key_length], 0,
58	0	HMAC_MAX_MD_CBLOCK - ctx->key_length);
59	0	}
60	0
61	0	if (reset) {
62	0	for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++)
63	0	pad[i] = 0x36 ^ ctx->key[i];
64	0	if (!EVP_DigestInit_ex(ctx->i_ctx, md, impl))
65	0	goto err;
66	0	if (!EVP_DigestUpdate(ctx->i_ctx, pad, EVP_MD_block_size(md)))
67	0	goto err;
68	0
69	0	for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++)
70	0	pad[i] = 0x5c ^ ctx->key[i];
71	0	if (!EVP_DigestInit_ex(ctx->o_ctx, md, impl))
72	0	goto err;
73	0	if (!EVP_DigestUpdate(ctx->o_ctx, pad, EVP_MD_block_size(md)))
74	0	goto err;
75	0	}
76	0	if (!EVP_MD_CTX_copy_ex(ctx->md_ctx, ctx->i_ctx))
77	0	goto err;
78	0	return 1;
79	0	err:
80	0	return 0;
81	0	}
82
83		#if OPENSSL_API_COMPAT < 0x10100000L
84		int HMAC_Init(HMAC_CTX ctx, const void key, int len, const EVP_MD *md)
85	0	{
86	0	if (key && md)
87	0	HMAC_CTX_reset(ctx);
88	0	return HMAC_Init_ex(ctx, key, len, md, NULL);
89	0	}
90		#endif
91
92		int HMAC_Update(HMAC_CTX ctx, const unsigned char data, size_t len)
93	0	{
94	0	if (!ctx->md)
95	0	return 0;
96	0	return EVP_DigestUpdate(ctx->md_ctx, data, len);
97	0	}
98
99		int HMAC_Final(HMAC_CTX ctx, unsigned char md, unsigned int *len)
100	0	{
101	0	unsigned int i;
102	0	unsigned char buf[EVP_MAX_MD_SIZE];
103	0
104	0	if (!ctx->md)
105	0	goto err;
106	0
107	0	if (!EVP_DigestFinal_ex(ctx->md_ctx, buf, &i))
108	0	goto err;
109	0	if (!EVP_MD_CTX_copy_ex(ctx->md_ctx, ctx->o_ctx))
110	0	goto err;
111	0	if (!EVP_DigestUpdate(ctx->md_ctx, buf, i))
112	0	goto err;
113	0	if (!EVP_DigestFinal_ex(ctx->md_ctx, md, len))
114	0	goto err;
115	0	return 1;
116	0	err:
117	0	return 0;
118	0	}
119
120		size_t HMAC_size(const HMAC_CTX *ctx)
121	0	{
122	0	int size = EVP_MD_size((ctx)->md);
123	0
124	0	return (size < 0) ? 0 : size;
125	0	}
126
127		HMAC_CTX *HMAC_CTX_new(void)
128	0	{
129	0	HMAC_CTX *ctx = OPENSSL_zalloc(sizeof(HMAC_CTX));
130	0
131	0	if (ctx != NULL) {
132	0	if (!HMAC_CTX_reset(ctx)) {
133	0	HMAC_CTX_free(ctx);
134	0	return NULL;
135	0	}
136	0	}
137	0	return ctx;
138	0	}
139
140		static void hmac_ctx_cleanup(HMAC_CTX *ctx)
141	0	{
142	0	EVP_MD_CTX_reset(ctx->i_ctx);
143	0	EVP_MD_CTX_reset(ctx->o_ctx);
144	0	EVP_MD_CTX_reset(ctx->md_ctx);
145	0	ctx->md = NULL;
146	0	ctx->key_length = 0;
147	0	OPENSSL_cleanse(ctx->key, sizeof(ctx->key));
148	0	}
149
150		void HMAC_CTX_free(HMAC_CTX *ctx)
151	0	{
152	0	if (ctx != NULL) {
153	0	hmac_ctx_cleanup(ctx);
154	0	EVP_MD_CTX_free(ctx->i_ctx);
155	0	EVP_MD_CTX_free(ctx->o_ctx);
156	0	EVP_MD_CTX_free(ctx->md_ctx);
157	0	OPENSSL_free(ctx);
158	0	}
159	0	}
160
161		static int hmac_ctx_alloc_mds(HMAC_CTX *ctx)
162	0	{
163	0	if (ctx->i_ctx == NULL)
164	0	ctx->i_ctx = EVP_MD_CTX_new();
165	0	if (ctx->i_ctx == NULL)
166	0	return 0;
167	0	if (ctx->o_ctx == NULL)
168	0	ctx->o_ctx = EVP_MD_CTX_new();
169	0	if (ctx->o_ctx == NULL)
170	0	return 0;
171	0	if (ctx->md_ctx == NULL)
172	0	ctx->md_ctx = EVP_MD_CTX_new();
173	0	if (ctx->md_ctx == NULL)
174	0	return 0;
175	0	return 1;
176	0	}
177
178		int HMAC_CTX_reset(HMAC_CTX *ctx)
179	0	{
180	0	hmac_ctx_cleanup(ctx);
181	0	if (!hmac_ctx_alloc_mds(ctx)) {
182	0	hmac_ctx_cleanup(ctx);
183	0	return 0;
184	0	}
185	0	return 1;
186	0	}
187
188		int HMAC_CTX_copy(HMAC_CTX dctx, HMAC_CTX sctx)
189	0	{
190	0	if (!hmac_ctx_alloc_mds(dctx))
191	0	goto err;
192	0	if (!EVP_MD_CTX_copy_ex(dctx->i_ctx, sctx->i_ctx))
193	0	goto err;
194	0	if (!EVP_MD_CTX_copy_ex(dctx->o_ctx, sctx->o_ctx))
195	0	goto err;
196	0	if (!EVP_MD_CTX_copy_ex(dctx->md_ctx, sctx->md_ctx))
197	0	goto err;
198	0	memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK);
199	0	dctx->key_length = sctx->key_length;
200	0	dctx->md = sctx->md;
201	0	return 1;
202	0	err:
203	0	hmac_ctx_cleanup(dctx);
204	0	return 0;
205	0	}
206
207		unsigned char HMAC(const EVP_MD evp_md, const void *key, int key_len,
208		const unsigned char d, size_t n, unsigned char md,
209		unsigned int *md_len)
210	0	{
211	0	HMAC_CTX *c = NULL;
212	0	static unsigned char m[EVP_MAX_MD_SIZE];
213	0	static const unsigned char dummy_key[1] = {'\0'};
214	0
215	0	if (md == NULL)
216	0	md = m;
217	0	if ((c = HMAC_CTX_new()) == NULL)
218	0	goto err;
219	0
220	0	/* For HMAC_Init_ex, NULL key signals reuse. */
221	0	if (key == NULL && key_len == 0) {
222	0	key = dummy_key;
223	0	}
224	0
225	0	if (!HMAC_Init_ex(c, key, key_len, evp_md, NULL))
226	0	goto err;
227	0	if (!HMAC_Update(c, d, n))
228	0	goto err;
229	0	if (!HMAC_Final(c, md, md_len))
230	0	goto err;
231	0	HMAC_CTX_free(c);
232	0	return md;
233	0	err:
234	0	HMAC_CTX_free(c);
235	0	return NULL;
236	0	}
237
238		void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags)
239	0	{
240	0	EVP_MD_CTX_set_flags(ctx->i_ctx, flags);
241	0	EVP_MD_CTX_set_flags(ctx->o_ctx, flags);
242	0	EVP_MD_CTX_set_flags(ctx->md_ctx, flags);
243	0	}
244
245		const EVP_MD HMAC_CTX_get_md(const HMAC_CTX ctx)
246	0	{
247	0	return ctx->md;
248	0	}