hmacmd5.c File Reference

Unix SMB/CIFS implementation. HMAC MD5 code for use in NTLMv2. More...

#include "hmacmd5.h"
#include <string.h>

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Functions
void	hmac_md5_init_limK_to_64 (const uchar *key, int key_len, HMACMD5Context *ctx)
	The microsoft version of hmac_md5 initialisation.
void	hmac_md5_update (const uchar *text, int text_len, HMACMD5Context *ctx)
	Update hmac_md5 "inner" buffer.
void	hmac_md5_final (uchar *digest, HMACMD5Context *ctx)
	Finish off hmac_md5 "inner" buffer and generate outer one.
void	hmac_md5 (uchar key[16], uchar *data, int data_len, uchar *digest)
	Function to calculate an HMAC MD5 digest from data. Use the microsoft hmacmd5 init method because the key is 16 bytes.

Detailed Description

Unix SMB/CIFS implementation. HMAC MD5 code for use in NTLMv2.

taken direct from rfc2104 implementation and modified for suitable use for ntlmv2.

Definition in file hmacmd5.c.

Function Documentation

hmac_md5()

void hmac_md5	(	uchar	key[16],
		uchar *	data,
		int	data_len,
		uchar *	digest )

Function to calculate an HMAC MD5 digest from data. Use the microsoft hmacmd5 init method because the key is 16 bytes.

Definition at line 82 of file hmacmd5.c.

{
  HMACMD5Context ctx;
  hmac_md5_init_limK_to_64 (key, 16, &ctx);
  if (data_len != 0)
    {
      hmac_md5_update (data, data_len, &ctx);
    }
  hmac_md5_final (digest, &ctx);
}

References hmac_md5_final(), hmac_md5_init_limK_to_64(), hmac_md5_update(), and uchar.

Referenced by ntlmssp_genauth_ntlm2().

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hmac_md5_final()

void hmac_md5_final	(	uchar *	digest,
		HMACMD5Context *	ctx )

Finish off hmac_md5 "inner" buffer and generate outer one.

Definition at line 64 of file hmacmd5.c.

{
  struct MD5Context ctx_o;
 
  MD5Final (digest, &ctx->ctx);
 
  MD5Init (&ctx_o);
  MD5Update (&ctx_o, ctx->k_opad, 64);
  MD5Update (&ctx_o, digest, 16);
  MD5Final (digest, &ctx_o);
}

References HMACMD5Context::ctx, HMACMD5Context::k_opad, MD5Final(), MD5Init(), MD5Update(), and uchar.

Referenced by hmac_md5(), nasl_ntv2_owf_gen(), SMBOWFencrypt_ntv2_ntlmssp(), and SMBsesskeygen_ntv2_ntlmssp().

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hmac_md5_init_limK_to_64()

void hmac_md5_init_limK_to_64	(	const uchar *	key,
		int	key_len,
		HMACMD5Context *	ctx )

The microsoft version of hmac_md5 initialisation.

Definition at line 24 of file hmacmd5.c.

{
  int i;
 
  /* if key is longer than 64 bytes truncate it */
  if (key_len > 64)
    {
      key_len = 64;
    }
 
  /* start out by storing key in pads */
  ZERO_STRUCT (ctx->k_ipad);
  ZERO_STRUCT (ctx->k_opad);
  memcpy (ctx->k_ipad, key, key_len);
  memcpy (ctx->k_opad, key, key_len);
 
  /* XOR key with ipad and opad values */
  for (i = 0; i < 64; i++)
    {
      ctx->k_ipad[i] ^= 0x36;
      ctx->k_opad[i] ^= 0x5c;
    }
 
  MD5Init (&ctx->ctx);
  MD5Update (&ctx->ctx, ctx->k_ipad, 64);
}

References HMACMD5Context::ctx, HMACMD5Context::k_ipad, HMACMD5Context::k_opad, MD5Init(), MD5Update(), uchar, and ZERO_STRUCT.

Referenced by hmac_md5(), nasl_ntv2_owf_gen(), SMBOWFencrypt_ntv2_ntlmssp(), and SMBsesskeygen_ntv2_ntlmssp().

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hmac_md5_update()

void hmac_md5_update	(	const uchar *	text,
		int	text_len,
		HMACMD5Context *	ctx )

Update hmac_md5 "inner" buffer.

Definition at line 55 of file hmacmd5.c.

{
  MD5Update (&ctx->ctx, text, text_len); /* then text of datagram */
}

References HMACMD5Context::ctx, MD5Update(), and uchar.

Referenced by hmac_md5(), nasl_ntv2_owf_gen(), SMBOWFencrypt_ntv2_ntlmssp(), and SMBsesskeygen_ntv2_ntlmssp().

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