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Annotation of src/include/sha1.h, Revision 1.2

1.1       millert     1: /* --------------------------------- SHA1.H ------------------------------- */
                      2:
                      3: /* NIST proposed Secure Hash Standard.
                      4:
                      5:    Written 2 September 1992, Peter C. Gutmann.
                      6:    This implementation placed in the public domain.
                      7:
                      8:    Comments to pgut1@cs.aukuni.ac.nz */
                      9:
1.2     ! millert    10: #ifndef _SHA1_H
        !            11: #define _SHA1_H
        !            12:
1.1       millert    13: /* Useful defines/typedefs */
                     14:
                     15: typedef unsigned char   BYTE;
                     16: typedef u_int32_t      LONG;
                     17:
                     18: /* The SHA1 block size and message digest sizes, in bytes */
                     19:
                     20: #define SHA1_BLOCKSIZE   64
                     21: #define SHA1_DIGESTSIZE  20
                     22:
                     23: /* The structure for storing SHA1 info */
                     24:
                     25: typedef struct {
                     26:               LONG digest[ 5 ];            /* Message digest */
                     27:               LONG countLo, countHi;       /* 64-bit bit count */
                     28:               LONG data[ 16 ];             /* SHA1 data buffer */
                     29:               } SHA1_INFO;
                     30:
                     31: /* The next def turns on the change to the algorithm introduced by NIST at
                     32:  * the behest of the NSA.  It supposedly corrects a weakness in the original
                     33:  * formulation.  Bruce Schneier described it thus in a posting to the
                     34:  * Cypherpunks mailing list on June 21, 1994 (as told to us by Steve Bellovin):
                     35:  *
                     36:  *     This is the fix to the Secure Hash Standard, NIST FIPS PUB 180:
                     37:  *
                     38:  *          In Section 7 of FIPS 180 (page 9), the line which reads
                     39:  *
                     40:  *          "b) For t=16 to 79 let Wt = Wt-3 XOR Wt-8 XOR Wt-14 XOR
                     41:  *          Wt-16."
                     42:  *
                     43:  *          is to be replaced by
                     44:  *
                     45:  *          "b) For t=16 to 79 let Wt = S1(Wt-3 XOR Wt-8 XOR Wt-14 XOR
                     46:  *          Wt-16)."
                     47:  *
                     48:  *          where S1 is a left circular shift by one bit as defined in
                     49:  *          Section 3 of FIPS 180 (page 6):
                     50:  *
                     51:  *          S1(X) = (X<<1) OR (X>>31).
                     52:  *
                     53:  */
1.2     ! millert    54: #define NEW_SHA1
1.1       millert    55:
1.2     ! millert    56: void sha1Init (SHA1_INFO *);
        !            57: void sha1Transform (SHA1_INFO *);
        !            58: void sha1Final (SHA1_INFO *);
        !            59: void sha1Update (SHA1_INFO *, BYTE *, int);
        !            60:
        !            61: #endif /* _SHA1_H */