DER_Digest.h

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/* Copyright (c) 2005-2008,2010 Apple Inc. All Rights Reserved. */
 
/*
 * DER_Digest.h - DER encode a DigestInfo
 *
 * Created Nov. 9 2005 by dmitch
 */
 
#ifndef _DER_DIGEST_H_
#define _DER_DIGEST_H_
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include "libDER.h"
 
/* 
 * Create an encoded DigestInfo based on the specified SHA1 digest. 
 * The incoming digest must be 20 bytes long. 
 *
 * Result is placed in caller's buffer, which must be at least of
 * length DER_SHA1_DIGEST_INFO_LEN bytes. 
 *
 * The *resultLen parameter is the available size in the result
 * buffer on input, and the actual length of the encoded DigestInfo 
 * on output. 
 */
#define DER_SHA1_DIGEST_LEN     20
#define DER_SHA1_DIGEST_INFO_LEN  35 
 
DERReturn DEREncodeSHA1DigestInfo(
  const DERByte *sha1Digest,
  DERSize     sha1DigestLen,
  DERByte     *result,    /* encoded result RETURNED here */
  DERSize     *resultLen);  /* IN/OUT */
 
#define DER_SHA256_DIGEST_LEN   32
#define DER_SHA256_DIGEST_INFO_LEN  51 
 
DERReturn DEREncodeSHA256DigestInfo(
  const DERByte *sha256Digest,
  DERSize     sha256DigestLen,
  DERByte     *result,    /* encoded result RETURNED here */
  DERSize     *resultLen);  /* IN/OUT */
 
/*
 * Likewise, create an encoded DIgestInfo for specified MD5 or MD2 digest. 
 */
#define DER_MD_DIGEST_LEN     16
#define DER_MD_DIGEST_INFO_LEN    34 
 
typedef enum {
  WD_MD2 = 1,
  WD_MD5 = 2
} WhichDigest;
 
DERReturn DEREncodeMDDigestInfo(
  WhichDigest   whichDigest,
  const DERByte *mdDigest,
  DERSize     mdDigestLen,
  DERByte     *result,    /* encoded result RETURNED here */
  DERSize     *resultLen);  /* IN/OUT */
 
/* max sizes you'll need in the general cases */
#define DER_MAX_DIGEST_LEN      DER_SHA256_DIGEST_LEN
#define DER_MAX_ENCODED_INFO_LEN  DER_SHA256_DIGEST_INFO_LEN
 
#ifdef __cplusplus
}
#endif
 
#endif  /* _DER_DIGEST_H_ */