/* * BIRD Library -- SHA-1 Hash Function (FIPS 180-1, RFC 3174) and HMAC-SHA-1 * * (c) 2015 CZ.NIC z.s.p.o. * * Based on the code from libucw-6.4 * (c) 2008--2009 Martin Mares <mj@ucw.cz> * * Based on the code from libgcrypt-1.2.3, which is * (c) 1998, 2001, 2002, 2003 Free Software Foundation, Inc. * * Can be freely distributed and used under the terms of the GNU GPL. */ #ifndef _BIRD_SHA1_H_ #define _BIRD_SHA1_H_ #include "nest/bird.h" #define SHA1_SIZE 20 /* Size of the SHA1 hash in its binary representation */ #define SHA1_HEX_SIZE 41 /* Buffer length for a string containing SHA1 in hexadecimal format. */ #define SHA1_BLOCK_SIZE 64 /* SHA1 splits input to blocks of this size. */ /* * Internal SHA1 state. * You should use it just as an opaque handle only. */ struct sha1_context { u32 h0, h1, h2, h3, h4; byte buf[SHA1_BLOCK_SIZE]; uint nblocks; uint count; }; void sha1_init(struct sha1_context *ctx); /* Initialize new algorithm run in the @ctx context. **/ /* * Push another @len bytes of data pointed to by @buf onto the SHA1 hash * currently in @ctx. You can call this any times you want on the same hash (and * you do not need to reinitialize it by @sha1_init()). It has the same effect * as concatenating all the data together and passing them at once. */ void sha1_update(struct sha1_context *ctx, const byte *buf, uint len); /* * No more @sha1_update() calls will be done. This terminates the hash and * returns a pointer to it. * * Note that the pointer points into data in the @ctx context. If it ceases to * exist, the pointer becomes invalid. */ byte *sha1_final(struct sha1_context *ctx); /* * A convenience one-shot function for SHA1 hash. It is equivalent to this * snippet of code: * * sha1_context ctx; * sha1_init(&ctx); * sha1_update(&ctx, buffer, length); * memcpy(outbuf, sha1_final(&ctx), SHA1_SIZE); */ void sha1_hash_buffer(byte *outbuf, const byte *buffer, uint length); /* * SHA1 HMAC message authentication. If you provide @key and @data, the result * will be stored in @outbuf. */ void sha1_hmac(byte *outbuf, const byte *key, uint keylen, const byte *data, uint datalen); /* * The HMAC also exists in a stream version in a way analogous to the plain * SHA1. Pass this as a context. */ struct sha1_hmac_context { struct sha1_context ictx; struct sha1_context octx; }; void sha1_hmac_init(struct sha1_hmac_context *ctx, const byte *key, uint keylen); /* Initialize HMAC with context @ctx and the given key. See sha1_init(). */ void sha1_hmac_update(struct sha1_hmac_context *ctx, const byte *data, uint datalen); /* Hash another @datalen bytes of data. See sha1_update(). */ byte *sha1_hmac_final(struct sha1_hmac_context *ctx); /* Terminate the HMAC and return a pointer to the allocated hash. See sha1_final(). */ #endif /* _BIRD_SHA1_H_ */