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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. */
};
DIGEST_CTX
rpmDigestDup(DIGEST_CTX octx)
{
DIGEST_CTX nctx;
nctx = memcpy(xcalloc(1, sizeof(*nctx)), octx, sizeof(*nctx));
nctx->hashctx = HASH_Clone(octx->hashctx);
if (nctx->hashctx == NULL) {
fprintf(stderr, "HASH_Clone failed\n");
exit(EXIT_FAILURE); /* FIX: callers do not bother checking error return */
}
return nctx;
}
static HASH_HashType
getHashType(pgpHashAlgo hashalgo)
{
switch (hashalgo) {
case PGPHASHALGO_MD5:
return HASH_AlgMD5;
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_MD2:
case PGPHASHALGO_TIGER192:
case PGPHASHALGO_HAVAL_5_160:
default:
return HASH_AlgNULL;
break;
}
}
size_t
rpmDigestLength(pgpHashAlgo hashalgo)
{
return HASH_ResultLen(getHashType(hashalgo));
}
DIGEST_CTX
rpmDigestInit(pgpHashAlgo hashalgo, rpmDigestFlags flags)
{
HASH_HashType type;
DIGEST_CTX ctx = xcalloc(1, sizeof(*ctx));
ctx->flags = flags;
type = getHashType(hashalgo);
if (type == HASH_AlgNULL) {
free(ctx);
return NULL;
}
ctx->hashctx = HASH_Create(type);
if (ctx->hashctx == NULL) {
free(ctx);
return NULL;
}
HASH_Begin(ctx->hashctx);
DPRINTF((stderr, "*** Init(%x) ctx %p hashctx %p\n", flags, ctx, ctx->hashctx));
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;
char * t;
size_t i;
size_t 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;
static const char hex[] = "0123456789abcdef";
*datap = t = xmalloc((2*digestlen) + 1);
for (i = 0 ; i < digestlen; i++) {
*t++ = hex[ (unsigned)((*s >> 4) & 0x0f) ];
*t++ = hex[ (unsigned)((*s++ ) & 0x0f) ];
}
*t = '\0';
}
}
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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