/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "sechash.h"
#include "secoidt.h"
#include "secerr.h"
#include "blapi.h"
#include "pk11func.h"	/* for the PK11_ calls below. */

static void *
null_hash_new_context(void)
{
    return NULL;
}

static void *
null_hash_clone_context(void *v)
{
    PORT_Assert(v == NULL);
    return NULL;
}

static void
null_hash_begin(void *v)
{
}

static void
null_hash_update(void *v, const unsigned char *input, unsigned int length)
{
}

static void
null_hash_end(void *v, unsigned char *output, unsigned int *outLen,
	      unsigned int maxOut)
{
    *outLen = 0;
}

static void
null_hash_destroy_context(void *v, PRBool b)
{
    PORT_Assert(v == NULL);
}


static void *
md2_NewContext(void) {
	return (void *) PK11_CreateDigestContext(SEC_OID_MD2);
}

static void *
md5_NewContext(void) {
	return (void *) PK11_CreateDigestContext(SEC_OID_MD5);
}

static void *
sha1_NewContext(void) {
	return (void *) PK11_CreateDigestContext(SEC_OID_SHA1);
}

static void *
sha224_NewContext(void) {
	return (void *) PK11_CreateDigestContext(SEC_OID_SHA224);
}

static void *
sha256_NewContext(void) {
	return (void *) PK11_CreateDigestContext(SEC_OID_SHA256);
}

static void *
sha384_NewContext(void) {
	return (void *) PK11_CreateDigestContext(SEC_OID_SHA384);
}

static void *
sha512_NewContext(void) {
	return (void *) PK11_CreateDigestContext(SEC_OID_SHA512);
}

const SECHashObject SECHashObjects[] = {
  { 0,
    (void * (*)(void)) null_hash_new_context,
    (void * (*)(void *)) null_hash_clone_context,
    (void (*)(void *, PRBool)) null_hash_destroy_context,
    (void (*)(void *)) null_hash_begin,
    (void (*)(void *, const unsigned char *, unsigned int)) null_hash_update,
    (void (*)(void *, unsigned char *, unsigned int *,
	      unsigned int)) null_hash_end,
    0,
    HASH_AlgNULL
  },
  { MD2_LENGTH,
    (void * (*)(void)) md2_NewContext,
    (void * (*)(void *)) PK11_CloneContext,
    (void (*)(void *, PRBool)) PK11_DestroyContext,
    (void (*)(void *)) PK11_DigestBegin,
    (void (*)(void *, const unsigned char *, unsigned int)) PK11_DigestOp,
    (void (*)(void *, unsigned char *, unsigned int *, unsigned int)) 
							PK11_DigestFinal,
    MD2_BLOCK_LENGTH,
    HASH_AlgMD2
  },
  { MD5_LENGTH,
    (void * (*)(void)) md5_NewContext,
    (void * (*)(void *)) PK11_CloneContext,
    (void (*)(void *, PRBool)) PK11_DestroyContext,
    (void (*)(void *)) PK11_DigestBegin,
    (void (*)(void *, const unsigned char *, unsigned int)) PK11_DigestOp,
    (void (*)(void *, unsigned char *, unsigned int *, unsigned int)) 
							PK11_DigestFinal,
    MD5_BLOCK_LENGTH,
    HASH_AlgMD5
  },
  { SHA1_LENGTH,
    (void * (*)(void)) sha1_NewContext,
    (void * (*)(void *)) PK11_CloneContext,
    (void (*)(void *, PRBool)) PK11_DestroyContext,
    (void (*)(void *)) PK11_DigestBegin,
    (void (*)(void *, const unsigned char *, unsigned int)) PK11_DigestOp,
    (void (*)(void *, unsigned char *, unsigned int *, unsigned int)) 
							PK11_DigestFinal,
    SHA1_BLOCK_LENGTH,
    HASH_AlgSHA1
  },
  { SHA256_LENGTH,
    (void * (*)(void)) sha256_NewContext,
    (void * (*)(void *)) PK11_CloneContext,
    (void (*)(void *, PRBool)) PK11_DestroyContext,
    (void (*)(void *)) PK11_DigestBegin,
    (void (*)(void *, const unsigned char *, unsigned int)) PK11_DigestOp,
    (void (*)(void *, unsigned char *, unsigned int *, unsigned int)) 
							PK11_DigestFinal,
    SHA256_BLOCK_LENGTH,
    HASH_AlgSHA256
  },
  { SHA384_LENGTH,
    (void * (*)(void)) sha384_NewContext,
    (void * (*)(void *)) PK11_CloneContext,
    (void (*)(void *, PRBool)) PK11_DestroyContext,
    (void (*)(void *)) PK11_DigestBegin,
    (void (*)(void *, const unsigned char *, unsigned int)) PK11_DigestOp,
    (void (*)(void *, unsigned char *, unsigned int *, unsigned int)) 
							PK11_DigestFinal,
    SHA384_BLOCK_LENGTH,
    HASH_AlgSHA384
  },
  { SHA512_LENGTH,
    (void * (*)(void)) sha512_NewContext,
    (void * (*)(void *)) PK11_CloneContext,
    (void (*)(void *, PRBool)) PK11_DestroyContext,
    (void (*)(void *)) PK11_DigestBegin,
    (void (*)(void *, const unsigned char *, unsigned int)) PK11_DigestOp,
    (void (*)(void *, unsigned char *, unsigned int *, unsigned int)) 
							PK11_DigestFinal,
    SHA512_BLOCK_LENGTH,
    HASH_AlgSHA512
  },
  { SHA224_LENGTH,
    (void * (*)(void)) sha224_NewContext,
    (void * (*)(void *)) PK11_CloneContext,
    (void (*)(void *, PRBool)) PK11_DestroyContext,
    (void (*)(void *)) PK11_DigestBegin,
    (void (*)(void *, const unsigned char *, unsigned int)) PK11_DigestOp,
    (void (*)(void *, unsigned char *, unsigned int *, unsigned int))
							PK11_DigestFinal,
    SHA224_BLOCK_LENGTH,
    HASH_AlgSHA224
  },
};

const SECHashObject * 
HASH_GetHashObject(HASH_HashType type)
{
    return &SECHashObjects[type];
}

HASH_HashType
HASH_GetHashTypeByOidTag(SECOidTag hashOid)
{
    HASH_HashType ht	= HASH_AlgNULL;

    switch(hashOid) {
    case SEC_OID_MD2:	 ht = HASH_AlgMD2;    break;
    case SEC_OID_MD5:	 ht = HASH_AlgMD5;    break;
    case SEC_OID_SHA1:	 ht = HASH_AlgSHA1;   break;
    case SEC_OID_SHA224: ht = HASH_AlgSHA224; break;
    case SEC_OID_SHA256: ht = HASH_AlgSHA256; break;
    case SEC_OID_SHA384: ht = HASH_AlgSHA384; break;
    case SEC_OID_SHA512: ht = HASH_AlgSHA512; break;
    default:             ht = HASH_AlgNULL;   
	PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
	break;
    }
    return ht;
}

SECOidTag
HASH_GetHashOidTagByHMACOidTag(SECOidTag hmacOid)
{
    SECOidTag hashOid = SEC_OID_UNKNOWN;

    switch(hmacOid) {
    /* no oid exists for HMAC_MD2 */
    /* NSS does not define a oid for HMAC_MD4 */
    case SEC_OID_HMAC_SHA1:   hashOid = SEC_OID_SHA1;   break;
    case SEC_OID_HMAC_SHA224: hashOid = SEC_OID_SHA224; break;
    case SEC_OID_HMAC_SHA256: hashOid = SEC_OID_SHA256; break;
    case SEC_OID_HMAC_SHA384: hashOid = SEC_OID_SHA384; break;
    case SEC_OID_HMAC_SHA512: hashOid = SEC_OID_SHA512; break;
    default:                  hashOid = SEC_OID_UNKNOWN;   
	PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
	break;
    }
    return hashOid;
}

SECOidTag
HASH_GetHMACOidTagByHashOidTag(SECOidTag hashOid)
{
    SECOidTag hmacOid = SEC_OID_UNKNOWN;

    switch(hashOid) {
    /* no oid exists for HMAC_MD2 */
    /* NSS does not define a oid for HMAC_MD4 */
    case SEC_OID_SHA1:   hmacOid = SEC_OID_HMAC_SHA1;   break;
    case SEC_OID_SHA224: hmacOid = SEC_OID_HMAC_SHA224; break;
    case SEC_OID_SHA256: hmacOid = SEC_OID_HMAC_SHA256; break;
    case SEC_OID_SHA384: hmacOid = SEC_OID_HMAC_SHA384; break;
    case SEC_OID_SHA512: hmacOid = SEC_OID_HMAC_SHA512; break;
    default:             hmacOid = SEC_OID_UNKNOWN;   
	PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
	break;
    }
    return hmacOid;
}

const SECHashObject * 
HASH_GetHashObjectByOidTag(SECOidTag hashOid)
{
    HASH_HashType ht	= HASH_GetHashTypeByOidTag(hashOid);

    return (ht == HASH_AlgNULL) ? NULL : &SECHashObjects[ht];
}

/* returns zero for unknown hash OID */
unsigned int
HASH_ResultLenByOidTag(SECOidTag hashOid)
{
    const SECHashObject * hashObject = HASH_GetHashObjectByOidTag(hashOid);
    unsigned int          resultLen = 0;

    if (hashObject)
    	resultLen = hashObject->length;
    return resultLen;
}

/* returns zero if hash type invalid. */
unsigned int
HASH_ResultLen(HASH_HashType type)
{
    if ( ( type < HASH_AlgNULL ) || ( type >= HASH_AlgTOTAL ) ) {
	PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
	return(0);
    }
    
    return(SECHashObjects[type].length);
}

unsigned int
HASH_ResultLenContext(HASHContext *context)
{
    return(context->hashobj->length);
}



SECStatus
HASH_HashBuf(HASH_HashType type,
	     unsigned char *dest,
	     const unsigned char *src,
	     PRUint32 src_len)
{
    HASHContext *cx;
    unsigned int part;
    
    if ( ( type < HASH_AlgNULL ) || ( type >= HASH_AlgTOTAL ) ) {
	return(SECFailure);
    }
    
    cx = HASH_Create(type);
    if ( cx == NULL ) {
	return(SECFailure);
    }
    HASH_Begin(cx);
    HASH_Update(cx, src, src_len);
    HASH_End(cx, dest, &part, HASH_ResultLenContext(cx));
    HASH_Destroy(cx);

    return(SECSuccess);
}

HASHContext *
HASH_Create(HASH_HashType type)
{
    void *hash_context = NULL;
    HASHContext *ret = NULL;
    
    if ( ( type < HASH_AlgNULL ) || ( type >= HASH_AlgTOTAL ) ) {
	return(NULL);
    }
    
    hash_context = (* SECHashObjects[type].create)();
    if ( hash_context == NULL ) {
	goto loser;
    }

    ret = (HASHContext *)PORT_Alloc(sizeof(HASHContext));
    if ( ret == NULL ) {
	goto loser;
    }

    ret->hash_context = hash_context;
    ret->hashobj = &SECHashObjects[type];
    
    return(ret);
    
loser:
    if ( hash_context != NULL ) {
	(* SECHashObjects[type].destroy)(hash_context, PR_TRUE);
    }
    
    return(NULL);
}


HASHContext *
HASH_Clone(HASHContext *context)
{
    void *hash_context = NULL;
    HASHContext *ret = NULL;
    
    hash_context = (* context->hashobj->clone)(context->hash_context);
    if ( hash_context == NULL ) {
	goto loser;
    }

    ret = (HASHContext *)PORT_Alloc(sizeof(HASHContext));
    if ( ret == NULL ) {
	goto loser;
    }

    ret->hash_context = hash_context;
    ret->hashobj = context->hashobj;
    
    return(ret);
    
loser:
    if ( hash_context != NULL ) {
	(* context->hashobj->destroy)(hash_context, PR_TRUE);
    }
    
    return(NULL);

}

void
HASH_Destroy(HASHContext *context)
{
    (* context->hashobj->destroy)(context->hash_context, PR_TRUE);
    PORT_Free(context);
    return;
}


void
HASH_Begin(HASHContext *context)
{
    (* context->hashobj->begin)(context->hash_context);
    return;
}


void
HASH_Update(HASHContext *context,
	    const unsigned char *src,
	    unsigned int len)
{
    (* context->hashobj->update)(context->hash_context, src, len);
    return;
}

void
HASH_End(HASHContext *context,
	 unsigned char *result,
	 unsigned int *result_len,
	 unsigned int max_result_len)
{
    (* context->hashobj->end)(context->hash_context, result, result_len,
			      max_result_len);
    return;
}

HASH_HashType
HASH_GetType(HASHContext *context)
{
    return(context->hashobj->type);
}