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106 lines
3.5 KiB
106 lines
3.5 KiB
/* $Id: sph_md2.h 154 2010-04-26 17:00:24Z tp $ */ |
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/** |
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* MD2 interface. |
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* |
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* MD2 is described in RFC 1319. Note: RFC 1319 contains both pseudo-code |
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* for the algorithm, and a C implementation. The pseudo-code is erroneous; |
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* an errata is available on: http://www.rfc-editor.org/errata.html . |
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* This implementation is compatible with the corrected MD2 and the C |
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* reference implementation. |
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* |
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* @warning A theoretical attack on MD2 has been published, which finds |
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* a second preimage with work factor 2^104, instead of the 2^128 which |
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* a good hash function with 128-bit output should feature. Use only with |
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* care. |
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* |
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* ==========================(LICENSE BEGIN)============================ |
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* |
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* Copyright (c) 2007-2010 Projet RNRT SAPHIR |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining |
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* a copy of this software and associated documentation files (the |
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* "Software"), to deal in the Software without restriction, including |
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* without limitation the rights to use, copy, modify, merge, publish, |
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* distribute, sublicense, and/or sell copies of the Software, and to |
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* permit persons to whom the Software is furnished to do so, subject to |
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* the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be |
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* included in all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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* |
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* ===========================(LICENSE END)============================= |
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* |
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* @file sph_md2.h |
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* @author Thomas Pornin <[email protected]> |
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*/ |
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#ifndef SPH_MD2_H__ |
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#define SPH_MD2_H__ |
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#include <stddef.h> |
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#include "sph_types.h" |
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/** |
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* Output size (in bits) for MD2. |
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*/ |
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#define SPH_SIZE_md2 128 |
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/** |
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* This structure is a context for MD2 computations: it contains the |
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* intermediate values and some data from the last entered block. Once |
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* a MD2 computation has been performed, the context can be reused for |
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* another computation. |
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* |
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* The contents of this structure are private. A running MD5 computation |
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* can be cloned by copying the context (e.g. with a simple |
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* <code>memcpy()</code>). |
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*/ |
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typedef struct { |
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#ifndef DOXYGEN_IGNORE |
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unsigned char buf[16]; /* first field, for alignment */ |
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union { |
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unsigned char X[48]; |
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sph_u32 W[12]; |
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} u; |
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unsigned char C[16]; |
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unsigned L, count; |
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#endif |
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} sph_md2_context; |
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/** |
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* Initialize a MD2 context. This process performs no memory allocation. |
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* |
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* @param cc the MD2 context (pointer to a <code>sph_md2_context</code>) |
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*/ |
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void sph_md2_init(void *cc); |
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/** |
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* Process some data bytes. It is acceptable that <code>len</code> is zero |
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* (in which case this function does nothing). |
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* |
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* @param cc the MD2 context |
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* @param data the input data |
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* @param len the input data length (in bytes) |
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*/ |
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void sph_md2(void *cc, const void *data, size_t len); |
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/** |
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* Terminate the current MD2 computation and output the result into the |
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* provided buffer. The destination buffer must be wide enough to |
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* accomodate the result (16 bytes). The context is automatically |
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* reinitialized. |
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* |
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* @param cc the MD2 context |
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* @param dst the destination buffer |
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*/ |
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void sph_md2_close(void *cc, void *dst); |
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#endif
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