cTripleDes Class Reference

Inheritance diagram for cTripleDes:

List of all members.

Protected Member Functions
void	ScheduleKey (void)
int	PadMessage (unsigned char *data, int len)
void	Expand (unsigned char *expanded, const unsigned char *normal)
void	Decrypt (unsigned char *data, int len)
const unsigned char *	Encrypt (const unsigned char *data, int len, unsigned char *crypt)
Protected Attributes
unsigned char	desKey [16]

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Detailed Description

Definition at line 38 of file newcamd.c.

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Member Function Documentation

void cTripleDes::Decrypt	(	unsigned char *	data,
		int	len
	)		[protected]

Definition at line 112 of file newcamd.c.

References L_CC_NEWCAMD, and PRINTF.

{
  if((len-2) % 8 || (len-2)<16) {
    PRINTF(L_CC_NEWCAMD,"warning: encrypted data size mismatch");
    return;
    }
  DES_cblock ivec;
  len-=sizeof(ivec); memcpy(ivec, data+len, sizeof(ivec));
  DES_ede2_cbc_encrypt(data+2,data+2,len-2,&ks1,&ks2,(DES_cblock *)ivec,DES_DECRYPT);
}

const unsigned char * cTripleDes::Encrypt	(	const unsigned char *	data,
		int	len,
		unsigned char *	crypt
	)		[protected]

Definition at line 103 of file newcamd.c.

{
  DES_cblock ivec;
  DES_random_key((DES_cblock *)ivec);
  memcpy(crypt+len,ivec,sizeof(ivec));
  DES_ede2_cbc_encrypt(data+2,crypt+2,len-2,&ks1,&ks2,(DES_cblock *)ivec,DES_ENCRYPT);
  return crypt;
}

void cTripleDes::Expand	(	unsigned char *	expanded,
		const unsigned char *	normal
	)		[protected]

Definition at line 65 of file newcamd.c.

Referenced by cCardClientNewCamd::Login().

{
  expand[0]  =   normal[0] & 0xfe;
  expand[1]  = ((normal[0] << 7) | (normal[1] >> 1)) & 0xfe;
  expand[2]  = ((normal[1] << 6) | (normal[2] >> 2)) & 0xfe;
  expand[3]  = ((normal[2] << 5) | (normal[3] >> 3)) & 0xfe;
  expand[4]  = ((normal[3] << 4) | (normal[4] >> 4)) & 0xfe;
  expand[5]  = ((normal[4] << 3) | (normal[5] >> 5)) & 0xfe;
  expand[6]  = ((normal[5] << 2) | (normal[6] >> 6)) & 0xfe;
  expand[7]  =   normal[6] << 1;
  expand[8]  =   normal[7] & 0xfe;
  expand[9]  = ((normal[7] << 7)  | (normal[8] >> 1)) & 0xfe;
  expand[10] = ((normal[8] << 6)  | (normal[9] >> 2)) & 0xfe;
  expand[11] = ((normal[9] << 5)  | (normal[10] >> 3)) & 0xfe;
  expand[12] = ((normal[10] << 4) | (normal[11] >> 4)) & 0xfe;
  expand[13] = ((normal[11] << 3) | (normal[12] >> 5)) & 0xfe;
  expand[14] = ((normal[12] << 2) | (normal[13] >> 6)) & 0xfe;
  expand[15] =   normal[13] << 1;
  SetOddParity(expand);
}

int cTripleDes::PadMessage	(	unsigned char *	data,
		int	len
	)		[protected]

Definition at line 86 of file newcamd.c.

References CWS_NETMSGSIZE, L_CC_NEWCAMD, PRINTF, and XorSum().

{
  DES_cblock padBytes;
  unsigned char noPadBytes;

  noPadBytes = (8 - ((len - 1) % 8)) % 8;
  if(len+noPadBytes+1 >= CWS_NETMSGSIZE-8) {
    PRINTF(L_CC_NEWCAMD,"message overflow in cTripleDes::PadMessage");
    return -1;
    }

  DES_random_key((DES_cblock *)padBytes);
  memcpy(data+len,padBytes,noPadBytes); len+=noPadBytes;
  data[len]=XorSum(data+2,len-2);
  return len+1;
}

void cTripleDes::ScheduleKey

(

void

)

[protected]

Definition at line 59 of file newcamd.c.

References desKey.

Referenced by cCardClientNewCamd::Login().

{
  DES_key_sched((DES_cblock *)&desKey[0],&ks1);
  DES_key_sched((DES_cblock *)&desKey[8],&ks2);
}

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Member Data Documentation

unsigned char cTripleDes::desKey[16] [protected]

Definition at line 44 of file newcamd.c.

Referenced by cCardClientNewCamd::Login(), and ScheduleKey().

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The documentation for this class was generated from the following file:

• sc/PLUGINS/src/sc-src/systems/cardclient/newcamd.c