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/** \ingroup signature
* \file rpmio/digest.c
*/
#include "system.h"
#include "rpmio/digest.h"
#include "debug.h"
#ifdef SHA_DEBUG
#define DPRINTF(_a) fprintf _a
#else
#define DPRINTF(_a)
#endif
/**
* MD5/SHA1 digest private data.
*/
struct DIGEST_CTX_s {
rpmDigestFlags flags; /*!< Bit(s) to control digest operation. */
HASHContext *hashctx; /*!< Internal NSS hash context. */
int algo; /*!< Used hash algorithm */
};
#define DIGESTS_MAX 11
struct rpmDigestBundle_s {
int index_min; /*!< Smallest index of active digest */
int index_max; /*!< Largest index of active digest */
off_t nbytes; /*!< Length of total input data */
DIGEST_CTX digests[DIGESTS_MAX]; /*!< Digest contexts indexed by algo */
};
rpmDigestBundle rpmDigestBundleNew(void)
{
rpmDigestBundle bundle = xcalloc(1, sizeof(*bundle));
return bundle;
}
rpmDigestBundle rpmDigestBundleFree(rpmDigestBundle bundle)
{
if (bundle) {
for (int i = bundle->index_min; i <= bundle->index_max ; i++) {
if (bundle->digests[i] == NULL)
continue;
rpmDigestFinal(bundle->digests[i], NULL, NULL, 0);
bundle->digests[i] = NULL;
}
memset(bundle, 0, sizeof(*bundle));
free(bundle);
}
return NULL;
}
int rpmDigestBundleAdd(rpmDigestBundle bundle, int algo,
rpmDigestFlags flags)
{
DIGEST_CTX ctx = NULL;
if (bundle && algo > 0 && algo < DIGESTS_MAX) {
if (bundle->digests[algo] == NULL) {
ctx = rpmDigestInit(algo, flags);
if (ctx) {
bundle->digests[algo] = ctx;
if (algo < bundle->index_min) {
bundle->index_min = algo;
}
if (algo > bundle->index_max) {
bundle->index_max = algo;
}
}
}
}
return (ctx != NULL);
}
int rpmDigestBundleUpdate(rpmDigestBundle bundle, const void *data, size_t len)
{
int rc = 0;
if (bundle && data && len > 0) {
for (int i = bundle->index_min; i <= bundle->index_max; i++) {
DIGEST_CTX ctx = bundle->digests[i];
if (ctx == NULL)
continue;
rc += rpmDigestUpdate(ctx, data, len);
}
bundle->nbytes += len;
}
return rc;
}
int rpmDigestBundleFinal(rpmDigestBundle bundle,
int algo, void ** datap, size_t * lenp, int asAscii)
{
int rc = 0;
if (bundle && algo >= bundle->index_min && algo <= bundle->index_max) {
rc = rpmDigestFinal(bundle->digests[algo], datap, lenp, asAscii);
bundle->digests[algo] = NULL;
}
return rc;
}
DIGEST_CTX rpmDigestBundleDupCtx(rpmDigestBundle bundle, int algo)
{
DIGEST_CTX dup = NULL;
if (bundle && algo >= bundle->index_min && algo <= bundle->index_max) {
dup = rpmDigestDup(bundle->digests[algo]);
}
return dup;
}
DIGEST_CTX
rpmDigestDup(DIGEST_CTX octx)
{
DIGEST_CTX nctx = NULL;
if (octx) {
HASHContext *hctx = HASH_Clone(octx->hashctx);
if (hctx) {
nctx = memcpy(xcalloc(1, sizeof(*nctx)), octx, sizeof(*nctx));
nctx->hashctx = hctx;
}
}
return nctx;
}
RPM_GNUC_PURE
static HASH_HashType getHashType(int hashalgo)
{
switch (hashalgo) {
case PGPHASHALGO_MD5:
return HASH_AlgMD5;
break;
case PGPHASHALGO_MD2:
return HASH_AlgMD2;
break;
case PGPHASHALGO_SHA1:
return HASH_AlgSHA1;
break;
case PGPHASHALGO_SHA256:
return HASH_AlgSHA256;
break;
case PGPHASHALGO_SHA384:
return HASH_AlgSHA384;
break;
case PGPHASHALGO_SHA512:
return HASH_AlgSHA512;
break;
case PGPHASHALGO_RIPEMD160:
case PGPHASHALGO_TIGER192:
case PGPHASHALGO_HAVAL_5_160:
default:
return HASH_AlgNULL;
break;
}
}
size_t
rpmDigestLength(int hashalgo)
{
return HASH_ResultLen(getHashType(hashalgo));
}
DIGEST_CTX
rpmDigestInit(int hashalgo, rpmDigestFlags flags)
{
HASH_HashType type = getHashType(hashalgo);
HASHContext *hashctx = NULL;
DIGEST_CTX ctx = NULL;
if (type == HASH_AlgNULL || rpmInitCrypto() < 0)
goto exit;
if ((hashctx = HASH_Create(type)) != NULL) {
ctx = xcalloc(1, sizeof(*ctx));
ctx->flags = flags;
ctx->algo = hashalgo;
ctx->hashctx = hashctx;
HASH_Begin(ctx->hashctx);
}
DPRINTF((stderr, "*** Init(%x) ctx %p hashctx %p\n", flags, ctx, ctx->hashctx));
exit:
return ctx;
}
int
rpmDigestUpdate(DIGEST_CTX ctx, const void * data, size_t len)
{
size_t partlen;
const unsigned char *ptr = data;
if (ctx == NULL)
return -1;
DPRINTF((stderr, "*** Update(%p,%p,%zd) hashctx %p \"%s\"\n", ctx, data, len, ctx->hashctx, ((char *)data)));
partlen = ~(unsigned int)0xFF;
while (len > 0) {
if (len < partlen) {
partlen = len;
}
HASH_Update(ctx->hashctx, ptr, partlen);
ptr += partlen;
len -= partlen;
}
return 0;
}
int
rpmDigestFinal(DIGEST_CTX ctx, void ** datap, size_t *lenp, int asAscii)
{
unsigned char * digest;
unsigned int digestlen;
if (ctx == NULL)
return -1;
digestlen = HASH_ResultLenContext(ctx->hashctx);
digest = xmalloc(digestlen);
DPRINTF((stderr, "*** Final(%p,%p,%p,%zd) hashctx %p digest %p\n", ctx, datap, lenp, asAscii, ctx->hashctx, digest));
/* FIX: check rc */
HASH_End(ctx->hashctx, digest, (unsigned int *) &digestlen, digestlen);
/* Return final digest. */
if (!asAscii) {
if (lenp) *lenp = digestlen;
if (datap) {
*datap = digest;
digest = NULL;
}
} else {
if (lenp) *lenp = (2*digestlen) + 1;
if (datap) {
const uint8_t * s = (const uint8_t *) digest;
*datap = pgpHexStr(s, digestlen);
}
}
if (digest) {
memset(digest, 0, digestlen); /* In case it's sensitive */
free(digest);
}
HASH_Destroy(ctx->hashctx);
memset(ctx, 0, sizeof(*ctx)); /* In case it's sensitive */
free(ctx);
return 0;
}
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