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bird 1.6.3

    1: /*
    2:  *	BIRD Library -- SHA-1 Hash Function (FIPS 180-1, RFC 3174)
    3:  *
    4:  *	(c) 2015 CZ.NIC z.s.p.o.
    5:  *
    6:  *	Based on the code from libucw-6.4
    7:  *	(c) 2008--2009 Martin Mares <mj@ucw.cz>
    8:  *
    9:  *	Based on the code from libgcrypt-1.2.3, which is
   10:  *	(c) 1998, 2001, 2002, 2003 Free Software Foundation, Inc.
   11:  *
   12:  *	Can be freely distributed and used under the terms of the GNU GPL.
   13:  */
   14: 
   15: #ifndef _BIRD_SHA1_H_
   16: #define _BIRD_SHA1_H_
   17: 
   18: #include "nest/bird.h"
   19: 
   20: 
   21: #define SHA1_SIZE		20	/* Size of the SHA1 hash in its binary representation */
   22: #define SHA1_HEX_SIZE		41	/* Buffer length for a string containing SHA1 in hexadecimal format. */
   23: #define SHA1_BLOCK_SIZE		64	/* SHA1 splits input to blocks of this size. */
   24: 
   25: 
   26: /*
   27:  * Internal SHA1 state.
   28:  * You should use it just as an opaque handle only.
   29:  */
   30: struct hash_context;
   31: 
   32: struct sha1_context {
   33:   u32 h0, h1, h2, h3, h4;
   34:   byte buf[SHA1_BLOCK_SIZE];
   35:   uint nblocks;
   36:   uint count;
   37: };
   38: 
   39: void sha1_init(struct hash_context *ctx); /* Initialize new algorithm run in the @ctx context. **/
   40: /*
   41:  * Push another @len bytes of data pointed to by @buf onto the SHA1 hash
   42:  * currently in @ctx. You can call this any times you want on the same hash (and
   43:  * you do not need to reinitialize it by @sha1_init()). It has the same effect
   44:  * as concatenating all the data together and passing them at once.
   45:  */
   46: void sha1_update(struct hash_context *ctx, const byte *buf, uint len);
   47: /*
   48:  * No more @sha1_update() calls will be done. This terminates the hash and
   49:  * returns a pointer to it.
   50:  *
   51:  * Note that the pointer points into data in the @ctx context. If it ceases to
   52:  * exist, the pointer becomes invalid.
   53:  */
   54: byte *sha1_final(struct hash_context *ctx);
   55: 
   56: /*
   57:  * A convenience one-shot function for SHA1 hash. It is equivalent to this
   58:  * snippet of code:
   59:  *
   60:  *  sha1_context ctx;
   61:  *  sha1_init(&ctx);
   62:  *  sha1_update(&ctx, buffer, length);
   63:  *  memcpy(outbuf, sha1_final(&ctx), SHA1_SIZE);
   64:  */
   65: void sha1_hash_buffer(byte *outbuf, const byte *buffer, uint length);
   66: 
   67: 
   68: #endif /* _BIRD_SHA1_H_ */