>Can anyone point me to a routeine for doing an SHA-1 has encoding. I need one to send a username and password for authentication of a user to a seperate system. Can anyone recommend a free utility for this.
>
>Thanks

Jason,

there is the code for you

*!*    Objet : Implémention en VisualFoxPro de l'algorithme de hachage SHA1
*!*    Auteur : C.Chenavier
*!*    Version : 1.00 - 15/11/2004


FUNCTION SHA1( cMessage )

PRIVATE HO, H1, H2, H3, H4
LOCAL nNbBlocs, nHigh, nLow

H0 = 0x67452301
H1 = 0xEFCDAB89
H2 = 0x98BADCFE
H3 = 0x10325476
H4 = 0xC3D2E1F0

M.nNbBlocs = LEN(M.cMessage) / 64

** Si au départ, la taille du message n'est pas un multiple de 512,
** alors l'algorithme complète le message en ajoutant un 1 et
** autant de 0 que nécessaires et les 8 derniers octets servent
** à stocker la longueur du message.

M.nLen = LEN(M.cMessage)
M.nReste = MOD(M.nLen, 64)
IF M.nReste > 0 OR M.nLen = 0
   M.nNbBlocs = M.nNbBlocs + 1
   IF M.nReste > 55
      M.cMessage = M.cMessage + CHR(2^7) + REPLICATE(CHR(0), (64 - M.nReste) + 55)
      M.nNbBlocs = M.nNbBlocs + 1
   ELSE
      M.cMessage = M.cMessage + CHR(2^7) + REPLICATE(CHR(0), (55 - M.nReste))
   ENDIF
   M.nHigh = (M.nLen*8) / 2^32
   M.nLow = MOD(M.nLen*8, 2^32)
   M.cMessage = M.cMessage + CHR(BITAND(BITRSHIFT(M.nHigh, 24), 0xFF)) ;    && 56
                           + CHR(BITAND(BITRSHIFT(M.nHigh, 16), 0xFF)) ;    && 57
                           + CHR(BITAND(BITRSHIFT(M.nHigh, 8), 0xFF))  ;    && 58
                           + CHR(BITAND(M.nHigh, 0xFF)) ;                   && 59
                           + CHR(BITAND(BITRSHIFT(M.nLow, 24), 0xFF)) ;     && 60
                           + CHR(BITAND(BITRSHIFT(M.nLow, 16), 0xFF)) ;     && 61
                           + CHR(BITAND(BITRSHIFT(M.nLow, 8), 0xFF))  ;     && 62
                           + CHR(BITAND(M.nLow, 0xFF))                      && 63
ENDIF

* NB! lisasin local i

LOCAL i

FOR I = 1 TO M.nNbBlocs
    DO SHA1_ProcessBloc WITH SUBSTR(M.cMessage, 1 + 64*(I-1), 64)
ENDFOR

RETURN SUBSTR(TRANSFORM(H0,"@0"),3) + ;
       SUBSTR(TRANSFORM(H1,"@0"),3) + ;
       SUBSTR(TRANSFORM(H2,"@0"),3) + ;
       SUBSTR(TRANSFORM(H3,"@0"),3) + ;
       SUBSTR(TRANSFORM(H4,"@0"),3)


PROCEDURE SHA1_ProcessBloc

LPARAMETERS cBloc

LOCAL I, A, B, C, D, E, nTemp
LOCAL ARRAY W(80)


** Pour chaque bloc de 512 bits, on divise le bloc en 16 mots de 32 bits
** et on les affecte respectivement à W1, W2...W16.

FOR I = 1 TO 16
    W(I) = BITLSHIFT(ASC(SUBSTR(M.cBloc, (I-1) * 4 + 1, 1)), 24) + ;
           BITLSHIFT(ASC(SUBSTR(M.cBloc, (I-1) * 4 + 2, 1)), 16) + ;
           BITLSHIFT(ASC(SUBSTR(M.cBloc, (I-1) * 4 + 3, 1)), 8) + ;
           ASC(SUBSTR(M.cBloc, (I-1) * 4 + 4, 1))
ENDFOR

** Pour I variant de 17 à 80, on affecte les mots Wi de la manière suivante :
** Wi = Wi-3 XOR Wi-8 XOR Wi-14 XOR Wi-16

FOR I = 17 TO 80
    W(i) = BitLRotate(1, BITXOR(W(i-3), W(i-8), W(i-14), W(i-16)))
ENDFOR

A = H0
B = H1
C = H2
D = H3
E = H4

** Pour I variant de 1 à 80 et avec Sn un décalage circulaire gauche de n bits,
** on effectue les calculs suivants :

FOR I = 1 TO 20
    M.nTemp = BitLRotate(5,A) + BITOR(BITAND(B,C), BITAND(BITNOT(B), D)) + ;
              E + W(i) + 0x5A827999
    E = D
    D = C
    C = BitLRotate(30,B)
    B = A
    A = M.nTemp
ENDFOR

FOR I = 21 TO 40
    M.nTemp = BitLRotate(5,A) + BITXOR(B, C, D) + E + W(i) + 0x6ED9EBA1
    E = D
    D = C
    C = BitLRotate(30,B)
    B = A
    A = M.nTemp
ENDFOR

FOR I = 41 TO 60
    M.nTemp = BitLRotate(5,A) + BITOR(BITAND(B,C), BITAND(B,D), BITAND(C,D)) + ;
              E + W(i) + 0x8F1BBCDC
    E = D
    D = C
    C = BitLRotate(30,B)
    B = A
    A = M.nTemp
ENDFOR

FOR I = 61 TO 80
    M.nTemp = BitLRotate(5,A) + BITXOR(B, C, D) + E + W(i) + 0xCA62C1D6
    E = D
    D = C
    C = BitLRotate(30,B)
    B = A
    A = M.nTemp
ENDFOR

H0 = H0 + A
H1 = H1 + B
H2 = H2 + C
H3 = H3 + D
H4 = H4 + E

RETURN


FUNCTION BitLRotate( nBits, nWord )

RETURN BITLSHIFT(M.nWord, M.nBits) + BITRSHIFT(M.nWord, (32-(M.nBits)))