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/** \ingroup signature
* \file rpmio/digest.c
*/
#include "system.h"
#include "rpmio_internal.h"
#include "debug.h"
#ifdef SHA_DEBUG
#define DPRINTF(_a) fprintf _a
#else
#define DPRINTF(_a)
#endif
/*@access DIGEST_CTX@*/
/**
* MD5/SHA1 digest private data.
*/
struct DIGEST_CTX_s {
rpmDigestFlags flags; /*!< Bit(s) to control digest operation. */
uint32_t datalen; /*!< No. bytes in block of plaintext data. */
uint32_t paramlen; /*!< No. bytes of digest parameters. */
uint32_t digestlen; /*!< No. bytes of digest. */
void * param; /*!< Digest parameters. */
int (*Reset) (void * param)
/*@modifies param @*/; /*!< Digest initialize. */
int (*Update) (void * param, const byte * data, size_t size)
/*@modifies param @*/; /*!< Digest transform. */
int (*Digest) (void * param, /*@out@*/ byte * digest)
/*@modifies param, digest @*/; /*!< Digest finish. */
};
/*@-boundsread@*/
DIGEST_CTX
rpmDigestDup(DIGEST_CTX octx)
{
DIGEST_CTX nctx;
nctx = memcpy(xcalloc(1, sizeof(*nctx)), octx, sizeof(*nctx));
nctx->param = memcpy(xcalloc(1, nctx->paramlen), octx->param, nctx->paramlen);
return nctx;
}
/*@=boundsread@*/
DIGEST_CTX
rpmDigestInit(pgpHashAlgo hashalgo, rpmDigestFlags flags)
{
DIGEST_CTX ctx = xcalloc(1, sizeof(*ctx));
int xx;
ctx->flags = flags;
switch (hashalgo) {
case PGPHASHALGO_MD5:
ctx->digestlen = 16;
ctx->datalen = 64;
/*@-sizeoftype@*/ /* FIX: union, not void pointer */
ctx->paramlen = sizeof(md5Param);
/*@=sizeoftype@*/
ctx->param = xcalloc(1, ctx->paramlen);
/*@-type@*/ /* FIX: cast? */
ctx->Reset = (void *) md5Reset;
ctx->Update = (void *) md5Update;
ctx->Digest = (void *) md5Digest;
/*@=type@*/
break;
case PGPHASHALGO_SHA1:
ctx->digestlen = 20;
ctx->datalen = 64;
/*@-sizeoftype@*/ /* FIX: union, not void pointer */
ctx->paramlen = sizeof(sha1Param);
/*@=sizeoftype@*/
ctx->param = xcalloc(1, ctx->paramlen);
/*@-type@*/ /* FIX: cast? */
ctx->Reset = (void *) sha1Reset;
ctx->Update = (void *) sha1Update;
ctx->Digest = (void *) sha1Digest;
/*@=type@*/
break;
case PGPHASHALGO_RIPEMD160:
case PGPHASHALGO_MD2:
case PGPHASHALGO_TIGER192:
case PGPHASHALGO_HAVAL_5_160:
default:
free(ctx);
return NULL;
/*@notreached@*/ break;
}
/*@-boundsread@*/
xx = (*ctx->Reset) (ctx->param);
/*@=boundsread@*/
DPRINTF((stderr, "*** Init(%x) ctx %p param %p\n", flags, ctx, ctx->param));
return ctx;
}
/*@-mustmod@*/ /* LCL: ctx->param may be modified, but ctx is abstract @*/
int
rpmDigestUpdate(DIGEST_CTX ctx, const void * data, size_t len)
{
if (ctx == NULL)
return -1;
DPRINTF((stderr, "*** Update(%p,%p,%d) param %p \"%s\"\n", ctx, data, len, ctx->param, ((char *)data)));
/*@-boundsread@*/
return (*ctx->Update) (ctx->param, data, len);
/*@=boundsread@*/
}
/*@=mustmod@*/
/*@-boundswrite@*/
int
rpmDigestFinal(DIGEST_CTX ctx, void ** datap, size_t *lenp, int asAscii)
{
byte * digest;
char * t;
int i;
if (ctx == NULL)
return -1;
digest = xmalloc(ctx->digestlen);
DPRINTF((stderr, "*** Final(%p,%p,%p,%d) param %p digest %p\n", ctx, datap, lenp, asAscii, ctx->param, digest));
/*@-noeffectuncon@*/ /* FIX: check rc */
(void) (*ctx->Digest) (ctx->param, digest);
/*@=noeffectuncon@*/
/* Return final digest. */
/*@-branchstate@*/
if (!asAscii) {
if (lenp) *lenp = ctx->digestlen;
if (datap) {
*datap = digest;
digest = NULL;
}
} else {
if (lenp) *lenp = (2*ctx->digestlen) + 1;
if (datap) {
const byte * s = (const byte *) digest;
static const char hex[] = "0123456789abcdef";
*datap = t = xmalloc((2*ctx->digestlen) + 1);
for (i = 0 ; i < ctx->digestlen; i++) {
*t++ = hex[ (unsigned)((*s >> 4) & 0x0f) ];
*t++ = hex[ (unsigned)((*s++ ) & 0x0f) ];
}
*t = '\0';
}
}
/*@=branchstate@*/
if (digest) {
memset(digest, 0, ctx->digestlen); /* In case it's sensitive */
free(digest);
}
memset(ctx->param, 0, ctx->paramlen); /* In case it's sensitive */
free(ctx->param);
memset(ctx, 0, sizeof(*ctx)); /* In case it's sensitive */
free(ctx);
return 0;
}
/*@=boundswrite@*/
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