scrypt-1.2.1/libcperciva/alg/sha256.h

   1 #ifndef _SHA256_H_
   2 #define _SHA256_H_
   3
   4 #include <stddef.h>
   5 #include <stdint.h>
   6
   7 /*
   8  * Use #defines in order to avoid namespace collisions with anyone else's
   9  * SHA256 code (e.g., the code in OpenSSL).
  10  */
  11 #define SHA256_Init libcperciva_SHA256_Init
  12 #define SHA256_Update libcperciva_SHA256_Update
  13 #define SHA256_Final libcperciva_SHA256_Final
  14 #define SHA256_Buf libcperciva_SHA256_Buf
  15 #define SHA256_CTX libcperciva_SHA256_CTX
  16 #define HMAC_SHA256_Init libcperciva_HMAC_SHA256_Init
  17 #define HMAC_SHA256_Update libcperciva_HMAC_SHA256_Update
  18 #define HMAC_SHA256_Final libcperciva_HMAC_SHA256_Final
  19 #define HMAC_SHA256_Buf libcperciva_HMAC_SHA256_Buf
  20 #define HMAC_SHA256_CTX libcperciva_HMAC_SHA256_CTX
  21
  22 /* Context structure for SHA256 operations. */
  23 typedef struct {
  24         uint32_t state[8];
  25         uint64_t count;
  26         uint8_t buf[64];
  27 } SHA256_CTX;
  28
  29 /**
  30  * SHA256_Init(ctx):
  31  * Initialize the SHA256 context ${ctx}.
  32  */
  33 void SHA256_Init(SHA256_CTX *);
  34
  35 /**
  36  * SHA256_Update(ctx, in, len):
  37  * Input ${len} bytes from ${in} into the SHA256 context ${ctx}.
  38  */
  39 void SHA256_Update(SHA256_CTX *, const void *, size_t);
  40
  41 /**
  42  * SHA256_Final(digest, ctx):
  43  * Output the SHA256 hash of the data input to the context ${ctx} into the
  44  * buffer ${digest}.
  45  */
  46 void SHA256_Final(uint8_t[32], SHA256_CTX *);
  47
  48 /**
  49  * SHA256_Buf(in, len, digest):
  50  * Compute the SHA256 hash of ${len} bytes from ${in} and write it to ${digest}.
  51  */
  52 void SHA256_Buf(const void *, size_t, uint8_t[32]);
  53
  54 /* Context structure for HMAC-SHA256 operations. */
  55 typedef struct {
  56         SHA256_CTX ictx;
  57         SHA256_CTX octx;
  58 } HMAC_SHA256_CTX;
  59
  60 /**
  61  * HMAC_SHA256_Init(ctx, K, Klen):
  62  * Initialize the HMAC-SHA256 context ${ctx} with ${Klen} bytes of key from
  63  * ${K}.
  64  */
  65 void HMAC_SHA256_Init(HMAC_SHA256_CTX *, const void *, size_t);
  66
  67 /**
  68  * HMAC_SHA256_Update(ctx, in, len):
  69  * Input ${len} bytes from ${in} into the HMAC-SHA256 context ${ctx}.
  70  */
  71 void HMAC_SHA256_Update(HMAC_SHA256_CTX *, const void *, size_t);
  72
  73 /**
  74  * HMAC_SHA256_Final(digest, ctx):
  75  * Output the HMAC-SHA256 of the data input to the context ${ctx} into the
  76  * buffer ${digest}.
  77  */
  78 void HMAC_SHA256_Final(uint8_t[32], HMAC_SHA256_CTX *);
  79
  80 /**
  81  * HMAC_SHA256_Buf(K, Klen, in, len, digest):
  82  * Compute the HMAC-SHA256 of ${len} bytes from ${in} using the key ${K} of
  83  * length ${Klen}, and write the result to ${digest}.
  84  */
  85 void HMAC_SHA256_Buf(const void *, size_t, const void *, size_t, uint8_t[32]);
  86
  87 /**
  88  * PBKDF2_SHA256(passwd, passwdlen, salt, saltlen, c, buf, dkLen):
  89  * Compute PBKDF2(passwd, salt, c, dkLen) using HMAC-SHA256 as the PRF, and
  90  * write the output to buf.  The value dkLen must be at most 32 * (2^32 - 1).
  91  */
  92 void PBKDF2_SHA256(const uint8_t *, size_t, const uint8_t *, size_t,
  93     uint64_t, uint8_t *, size_t);
  94
  95 #endif /* !_SHA256_H_ */