lib/sha256.h

   1 /*
   2  *      BIRD Library -- SHA-256 and SHA-224 Hash Functions,
   3  *                      HMAC-SHA-256 and HMAC-SHA-224 Functions
   4  *
   5  *      (c) 2015 CZ.NIC z.s.p.o.
   6  *
   7  *      Based on the code from libgcrypt-1.6.0, which is
   8  *      (c) 2003, 2006, 2008, 2009 Free Software Foundation, Inc.
   9  *
  10  *      Can be freely distributed and used under the terms of the GNU GPL.
  11  */
  12
  13 #ifndef _BIRD_SHA256_H_
  14 #define _BIRD_SHA256_H_
  15
  16 #include "nest/bird.h"
  17
  18
  19 #define SHA224_SIZE             28
  20 #define SHA224_HEX_SIZE         57
  21 #define SHA224_BLOCK_SIZE       64
  22
  23 #define SHA256_SIZE             32
  24 #define SHA256_HEX_SIZE         65
  25 #define SHA256_BLOCK_SIZE       64
  26
  27
  28 struct sha256_context {
  29   u32  h0, h1, h2, h3, h4, h5, h6, h7;
  30   byte buf[SHA256_BLOCK_SIZE];
  31   uint nblocks;
  32   uint count;
  33 };
  34
  35 #define sha224_context sha256_context
  36
  37
  38 void sha256_init(struct sha256_context *ctx);
  39 void sha224_init(struct sha224_context *ctx);
  40
  41 void sha256_update(struct sha256_context *ctx, const byte *buf, size_t len);
  42 static inline void sha224_update(struct sha224_context *ctx, const byte *buf, size_t len)
  43 { sha256_update(ctx, buf, len); }
  44
  45 byte *sha256_final(struct sha256_context *ctx);
  46 static inline byte *sha224_final(struct sha224_context *ctx)
  47 { return sha256_final(ctx); }
  48
  49
  50 /*
  51  *      HMAC-SHA256, HMAC-SHA224
  52  */
  53
  54 struct sha256_hmac_context
  55 {
  56   struct sha256_context ictx;
  57   struct sha256_context octx;
  58 };
  59
  60 #define sha224_hmac_context sha256_hmac_context
  61
  62
  63 void sha256_hmac_init(struct sha256_hmac_context *ctx, const byte *key, size_t keylen);
  64 void sha224_hmac_init(struct sha224_hmac_context *ctx, const byte *key, size_t keylen);
  65
  66 void sha256_hmac_update(struct sha256_hmac_context *ctx, const byte *buf, size_t buflen);
  67 void sha224_hmac_update(struct sha224_hmac_context *ctx, const byte *buf, size_t buflen);
  68
  69 byte *sha256_hmac_final(struct sha256_hmac_context *ctx);
  70 byte *sha224_hmac_final(struct sha224_hmac_context *ctx);
  71
  72
  73 #endif /* _BIRD_SHA256_H_ */