1 /* crypto/bn/bn_ctx.c */
2 /* Written by Ulf Moeller for the OpenSSL project. */
3 /* ====================================================================
4 * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
18 * 3. All advertising materials mentioning features or use of this
19 * software must display the following acknowledgment:
20 * "This product includes software developed by the OpenSSL Project
21 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
23 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
24 * endorse or promote products derived from this software without
25 * prior written permission. For written permission, please contact
26 * openssl-core@openssl.org.
28 * 5. Products derived from this software may not be called "OpenSSL"
29 * nor may "OpenSSL" appear in their names without prior written
30 * permission of the OpenSSL Project.
32 * 6. Redistributions of any form whatsoever must retain the following
34 * "This product includes software developed by the OpenSSL Project
35 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
37 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
38 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
39 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
40 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
43 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
44 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
45 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
46 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
47 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
48 * OF THE POSSIBILITY OF SUCH DAMAGE.
49 * ====================================================================
51 * This product includes cryptographic software written by Eric Young
52 * (eay@cryptsoft.com). This product includes software written by Tim
53 * Hudson (tjh@cryptsoft.com).
58 # undef NDEBUG /* avoid conflicting definitions */
68 BN_CTX
*BN_CTX_new(void)
72 ret
=(BN_CTX
*)malloc(sizeof(BN_CTX
));
79 ret
->flags
=BN_FLG_MALLOCED
;
83 void BN_CTX_init(BN_CTX
*ctx
)
90 for (i
= 0; i
< BN_CTX_NUM
; i
++)
91 BN_init(&(ctx
->bn
[i
]));
94 void BN_CTX_free(BN_CTX
*ctx
)
98 if (ctx
== NULL
) return;
99 assert(ctx
->depth
== 0);
101 for (i
=0; i
< BN_CTX_NUM
; i
++)
102 BN_clear_free(&(ctx
->bn
[i
]));
103 if (ctx
->flags
& BN_FLG_MALLOCED
)
107 void BN_CTX_start(BN_CTX
*ctx
)
109 if (ctx
->depth
< BN_CTX_NUM_POS
)
110 ctx
->pos
[ctx
->depth
] = ctx
->tos
;
114 BIGNUM
*BN_CTX_get(BN_CTX
*ctx
)
116 if (ctx
->depth
> BN_CTX_NUM_POS
|| ctx
->tos
>= BN_CTX_NUM
)
120 /* disable error code until BN_CTX_end is called: */
125 return (&(ctx
->bn
[ctx
->tos
++]));
128 void BN_CTX_end(BN_CTX
*ctx
)
130 if (ctx
== NULL
) return;
131 assert(ctx
->depth
> 0);
133 /* should never happen, but we can tolerate it if not in
134 * debug mode (could be a 'goto err' in the calling function
135 * before BN_CTX_start was reached) */
140 if (ctx
->depth
< BN_CTX_NUM_POS
)
141 ctx
->tos
= ctx
->pos
[ctx
->depth
];
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