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tomcrypt/keyring.c
Tom St Denis a6a5fc648b added libtomcrypt-0.75
2010-06-16 12:37:49 +02:00

841 lines
23 KiB
C
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/* Provides keyring functionality for libtomcrypt, Tom St Denis */
#include <mycrypt.h>
#ifdef KR
static const unsigned char key_magic[4] = { 0x12, 0x34, 0x56, 0x78 };
static const unsigned char file_magic[4] = { 0x9A, 0xBC, 0xDE, 0xF0 };
static const unsigned char sign_magic[4] = { 0x87, 0x56, 0x43, 0x21 };
static const unsigned char enc_magic[4] = { 0x0F, 0xED, 0xCB, 0xA9 };
static const unsigned long crc_table[256] = {
0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
0x2d02ef8dL
};
#define DO1(buf) crc = crc_table[((int)crc ^ (*buf++)) & 0xff] ^ (crc >> 8);
#define DO2(buf) DO1(buf); DO1(buf);
#define DO4(buf) DO2(buf); DO2(buf);
#define DO8(buf) DO4(buf); DO4(buf);
static unsigned long crc32 (unsigned long crc, const unsigned char *buf, unsigned long len)
{
crc = crc ^ 0xffffffffL;
while (len >= 8)
{
DO8 (buf);
len -= 8;
}
if (len)
do
{
DO1 (buf);
}
while (--len);
return crc ^ 0xffffffffUL;
}
int kr_init(pk_key **pk)
{
_ARGCHK(pk != NULL);
*pk = XCALLOC(1, sizeof(pk_key));
if (*pk == NULL) {
return CRYPT_MEM;
}
(*pk)->system = NON_KEY;
return CRYPT_OK;
}
unsigned long kr_crc(const unsigned char *name, const unsigned char *email, const unsigned char *description)
{
unsigned long crc;
_ARGCHK(name != NULL);
_ARGCHK(email != NULL);
_ARGCHK(description != NULL);
crc = crc32(0, NULL, 0);
crc = crc32(crc, name, MIN(MAXLEN, strlen((char *)name)));
crc = crc32(crc, email, MIN(MAXLEN, strlen((char *)email)));
return crc32(crc, description, MIN(MAXLEN, strlen((char *)description)));
}
pk_key *kr_find(pk_key *pk, unsigned long ID)
{
_ARGCHK(pk != NULL);
while (pk != NULL) {
if (pk->system != NON_KEY && pk->ID == ID) {
return pk;
}
pk = pk->next;
}
return NULL;
}
pk_key *kr_find_name(pk_key *pk, const char *name)
{
_ARGCHK(pk != NULL);
_ARGCHK(name != NULL);
while (pk != NULL) {
if (pk->system != NON_KEY && !strncmp((char *)pk->name, (char *)name, sizeof(pk->name)-1)) {
return pk;
}
pk = pk->next;
}
return NULL;
}
int kr_add(pk_key *pk, int key_type, int system, const unsigned char *name,
const unsigned char *email, const unsigned char *description, const _pk_key *key)
{
_ARGCHK(pk != NULL);
_ARGCHK(name != NULL);
_ARGCHK(email != NULL);
_ARGCHK(description != NULL);
_ARGCHK(key != NULL);
/* check parameters */
if (key_type != PK_PRIVATE && key_type != PK_PRIVATE_OPTIMIZED && key_type != PK_PUBLIC) {
return CRYPT_PK_INVALID_TYPE;
}
if (system != RSA_KEY && system != DH_KEY && system != ECC_KEY) {
return CRYPT_PK_INVALID_SYSTEM;
}
/* see if its a dupe */
if (kr_find(pk, kr_crc(name, email, description)) != NULL) {
return CRYPT_PK_DUP;
}
/* find spot in key ring */
while (pk->system != NON_KEY) {
if (pk->next == NULL) {
return CRYPT_ERROR;
}
pk = pk->next;
}
/* now we have a spot make a next spot */
pk->next = XCALLOC(1, sizeof(pk_key));
if (pk->next == NULL) {
return CRYPT_MEM;
}
pk->next->system = NON_KEY;
/* now add this new data to this ring spot */
pk->key_type = key_type;
pk->system = system;
strncpy((char *)pk->name, (char *)name, sizeof(pk->name)-1);
strncpy((char *)pk->email, (char *)email, sizeof(pk->email)-1);
strncpy((char *)pk->description, (char *)description, sizeof(pk->description)-1);
pk->ID = kr_crc(pk->name, pk->email, pk->description);
/* clear the memory area */
zeromem(&(pk->key), sizeof(pk->key));
/* copy the key */
switch (system) {
case RSA_KEY:
memcpy(&(pk->key.rsa), &(key->rsa), sizeof(key->rsa));
break;
case DH_KEY:
memcpy(&(pk->key.dh), &(key->dh), sizeof(key->dh));
break;
case ECC_KEY:
memcpy(&(pk->key.ecc), &(key->ecc), sizeof(key->ecc));
break;
}
return CRYPT_OK;
}
int kr_del(pk_key **_pk, unsigned long ID)
{
pk_key *ppk, *pk;
_ARGCHK(_pk != NULL);
pk = *_pk;
ppk = NULL;
while (pk->system != NON_KEY && pk->ID != ID) {
ppk = pk;
pk = pk->next;
if (pk == NULL) {
return CRYPT_PK_NOT_FOUND;
}
}
switch (pk->system) {
case RSA_KEY:
rsa_free(&(pk->key.rsa));
break;
case DH_KEY:
dh_free(&(pk->key.dh));
break;
case ECC_KEY:
ecc_free(&(pk->key.ecc));
break;
}
if (ppk == NULL) { /* the first element matches the ID */
ppk = pk->next; /* get the 2nd element */
XFREE(pk); /* free the first */
*_pk = ppk; /* make the first element the second */
} else { /* (not) first element matches the ID */
ppk->next = pk->next; /* make the previous'es next point to the current next */
XFREE(pk); /* free the element */
}
return CRYPT_OK;
}
int kr_clear(pk_key **pk)
{
int errno;
_ARGCHK(pk != NULL);
while ((*pk)->system != NON_KEY) {
if ((errno = kr_del(pk, (*pk)->ID)) != CRYPT_OK) {
return errno;
}
}
XFREE(*pk);
*pk = NULL;
return CRYPT_OK;
}
static unsigned long _write(unsigned char *buf, unsigned long len, FILE *f, symmetric_CTR *ctr)
{
#ifdef NO_FILE
return 0;
#else
_ARGCHK(buf != NULL);
_ARGCHK(f != NULL);
if (ctr != NULL) {
if (ctr_encrypt(buf, buf, len, ctr) != CRYPT_OK) {
return 0;
}
}
return fwrite(buf, 1, len, f);
#endif
}
static unsigned long _read(unsigned char *buf, unsigned long len, FILE *f, symmetric_CTR *ctr)
{
#ifdef NO_FILE
return 0;
#else
unsigned long y;
_ARGCHK(buf != NULL);
_ARGCHK(f != NULL);
y = fread(buf, 1, len, f);
if (ctr != NULL) {
if (ctr_decrypt(buf, buf, y, ctr) != CRYPT_OK) {
return 0;
}
}
return y;
#endif
}
int kr_export(pk_key *pk, unsigned long ID, int key_type, unsigned char *out, unsigned long *outlen)
{
unsigned char buf[8192], *obuf;
pk_key *ppk;
unsigned long len;
int errno;
_ARGCHK(pk != NULL);
_ARGCHK(out != NULL);
_ARGCHK(outlen != NULL);
/* find the desired key */
ppk = kr_find(pk, ID);
if (ppk == NULL) {
return CRYPT_PK_NOT_FOUND;
}
if (ppk->key_type == PK_PUBLIC && key_type != PK_PUBLIC) {
return CRYPT_PK_NOT_PRIVATE;
}
/* this makes PK_PRIVATE an alias for PK_PRIVATE_OPTIMIZED type */
if (ppk->key_type == PK_PRIVATE_OPTIMIZED && key_type == PK_PRIVATE) {
key_type = PK_PRIVATE_OPTIMIZED;
}
/* now copy the header and various other details */
memcpy(buf, key_magic, 4); /* magic info */
buf[4] = key_type; /* key type */
buf[5] = ppk->system; /* system */
STORE32L(ppk->ID, buf+6); /* key ID */
memcpy(buf+10, ppk->name, MAXLEN); /* the name */
memcpy(buf+10+MAXLEN, ppk->email, MAXLEN); /* the email */
memcpy(buf+10+MAXLEN+MAXLEN, ppk->description, MAXLEN); /* the description */
/* export key */
len = sizeof(buf) - (6 + 4 + MAXLEN*3);
obuf = buf+6+4+MAXLEN*3;
switch (ppk->system) {
case RSA_KEY:
if ((errno = rsa_export(obuf, &len, key_type, &(ppk->key.rsa))) != CRYPT_OK) {
return errno;
}
break;
case DH_KEY:
if ((errno = dh_export(obuf, &len, key_type, &(ppk->key.dh))) != CRYPT_OK) {
return errno;
}
break;
case ECC_KEY:
if ((errno = ecc_export(obuf, &len, key_type, &(ppk->key.ecc))) != CRYPT_OK) {
return errno;
}
break;
}
/* get the entire length of the packet */
len += 6 + 4 + 3*MAXLEN;
if (*outlen < len) {
#ifdef CLEAN_STACK
zeromem(buf, sizeof(buf));
#endif
return CRYPT_BUFFER_OVERFLOW;
} else {
*outlen = len;
memcpy(out, buf, len);
#ifdef CLEAN_STACK
zeromem(buf, sizeof(buf));
#endif
return CRYPT_OK;
}
}
int kr_import(pk_key *pk, const unsigned char *in)
{
_pk_key key;
int system, key_type, errno;
unsigned long ID;
_ARGCHK(pk != NULL);
_ARGCHK(in != NULL);
if (memcmp(in, key_magic, 4)) {
return CRYPT_INVALID_PACKET;
}
key_type = in[4]; /* get type */
system = in[5]; /* get system */
LOAD32L(ID,in+6); /* the ID */
if (ID != kr_crc(in+10, in+10+MAXLEN, in+10+MAXLEN+MAXLEN)) {
return CRYPT_INVALID_PACKET;
}
zeromem(&key, sizeof(key));
switch (system) {
case RSA_KEY:
if ((errno = rsa_import(in+10+3*MAXLEN, &(key.rsa))) != CRYPT_OK) {
return errno;
}
break;
case DH_KEY:
if ((errno = dh_import(in+10+3*MAXLEN, &(key.dh))) != CRYPT_OK) {
return errno;
}
break;
case ECC_KEY:
if ((errno = ecc_import(in+10+3*MAXLEN, &(key.ecc))) != CRYPT_OK) {
return errno;
}
break;
}
return kr_add(pk, key_type, system,
in+10, /* the name */
in+10+MAXLEN, /* email address */
in+10+MAXLEN+MAXLEN, /* description */
&key);
}
int kr_load(pk_key **pk, FILE *in, symmetric_CTR *ctr)
{
unsigned char buf[8192], blen[4];
unsigned long len;
int res, errno;
_ARGCHK(pk != NULL);
_ARGCHK(in != NULL);
/* init keyring */
if ((errno = kr_init(pk)) != CRYPT_OK) {
return errno;
}
/* read in magic bytes */
if (_read(buf, 6, in, ctr) != 6) { goto done2; }
if (memcmp(buf, file_magic, 4)) {
return CRYPT_INVALID_PACKET;
}
len = (unsigned long)buf[4] | ((unsigned long)buf[5] << 8);
if (len > CRYPT) {
return CRYPT_INVALID_PACKET;
}
/* while there are lengths to read... */
while (_read(blen, 4, in, ctr) == 4) {
/* get length */
LOAD32L(len, blen);
if (len > sizeof(buf)) {
return CRYPT_INVALID_PACKET;
}
if (_read(buf, len, in, ctr) != len) { goto done2; }
if ((errno = kr_import(*pk, buf)) != CRYPT_OK) {
return errno;
}
}
res = CRYPT_OK;
goto done;
done2:
res = CRYPT_ERROR;
done:
#ifdef CLEAN_STACK
zeromem(buf, sizeof(buf));
#endif
return res;
}
int kr_save(pk_key *pk, FILE *out, symmetric_CTR *ctr)
{
unsigned char buf[8192], blen[4];
unsigned long len;
int res, errno;
_ARGCHK(pk != NULL);
_ARGCHK(out != NULL);
/* write out magic bytes */
memcpy(buf, file_magic, 4);
buf[4] = CRYPT&255;
buf[5] = (CRYPT>>8)&255;
if (_write(buf, 6, out, ctr) != 6) { goto done2; }
while (pk->system != NON_KEY) {
len = sizeof(buf);
if ((errno = kr_export(pk, pk->ID, pk->key_type, buf, &len)) != CRYPT_OK) {
return errno;
}
STORE32L(len, blen);
if (_write(blen, 4, out, ctr) != 4) { goto done2; }
if (_write(buf, len, out, ctr) != len) { goto done2; }
pk = pk->next;
}
res = CRYPT_OK;
goto done;
done2:
res = CRYPT_ERROR;
done:
#ifdef CLEAN_STACK
zeromem(buf, sizeof(buf));
#endif
return res;
}
int kr_make_key(pk_key *pk, prng_state *prng, int wprng,
int system, int keysize, const unsigned char *name,
const unsigned char *email, const unsigned char *description)
{
_pk_key key;
int key_type, errno;
_ARGCHK(pk != NULL);
_ARGCHK(name != NULL);
_ARGCHK(email != NULL);
_ARGCHK(description != NULL);
/* valid PRNG? */
if ((errno = prng_is_valid(wprng)) != CRYPT_OK) {
return errno;
}
/* make the key first */
zeromem(&key, sizeof(key));
switch (system) {
case RSA_KEY:
if ((errno = rsa_make_key(prng, wprng, keysize, 65537, &(key.rsa))) != CRYPT_OK) {
return errno;
}
key_type = key.rsa.type;
break;
case DH_KEY:
if ((errno = dh_make_key(prng, wprng, keysize, &(key.dh))) != CRYPT_OK) {
return errno;
}
key_type = key.dh.type;
break;
case ECC_KEY:
if ((errno = ecc_make_key(prng, wprng, keysize, &(key.ecc))) != CRYPT_OK) {
return errno;
}
key_type = key.ecc.type;
break;
default:
return CRYPT_PK_INVALID_SYSTEM;
}
/* now add the key */
if ((errno = kr_add(pk, key_type, system, name, email, description, &key)) != CRYPT_OK) {
return errno;
}
#ifdef CLEAN_STACK
zeromem(&key, sizeof(key));
#endif
return CRYPT_OK;
}
int kr_encrypt_key(pk_key *pk, unsigned long ID,
const unsigned char *in, unsigned long inlen,
unsigned char *out, unsigned long *outlen,
prng_state *prng, int wprng, int hash)
{
unsigned char buf[8192];
unsigned long len;
pk_key *kr;
int errno;
_ARGCHK(pk != NULL);
_ARGCHK(in != NULL);
_ARGCHK(out != NULL);
_ARGCHK(outlen != NULL);
/* find the key */
kr = kr_find(pk, ID);
if (kr == NULL) {
return CRYPT_PK_NOT_FOUND;
}
/* store the header */
memcpy(buf, enc_magic, 4);
/* now store the ID */
STORE32L(kr->ID,buf+4);
/* now encrypt it */
len = sizeof(buf)-8;
switch (kr->system) {
case RSA_KEY:
if ((errno = rsa_encrypt_key(in, inlen, buf+8, &len, prng, wprng, &(kr->key.rsa))) != CRYPT_OK) {
return errno;
}
break;
case DH_KEY:
if ((errno = dh_encrypt_key(in, inlen, buf+8, &len, prng, wprng, hash, &(kr->key.dh))) != CRYPT_OK) {
return errno;
}
break;
case ECC_KEY:
if ((errno = ecc_encrypt_key(in, inlen, buf+8, &len, prng, wprng, hash, &(kr->key.ecc))) != CRYPT_OK) {
return errno;
}
break;
}
len += 8;
if (len > *outlen) {
#ifdef CLEAN_STACK
zeromem(buf, sizeof(buf));
#endif
return CRYPT_BUFFER_OVERFLOW;
} else {
memcpy(out, buf, len);
#ifdef CLEAN_STACK
zeromem(buf, sizeof(buf));
#endif
*outlen = len;
return CRYPT_OK;
}
}
int kr_decrypt_key(pk_key *pk, const unsigned char *in,
unsigned char *out, unsigned long *outlen)
{
unsigned char buf[8192];
unsigned long len, ID;
pk_key *kr;
int errno;
_ARGCHK(pk != NULL);
_ARGCHK(in != NULL);
_ARGCHK(out != NULL);
_ARGCHK(outlen != NULL);
/* check magic header */
if (memcmp(in, enc_magic, 4)) {
return CRYPT_INVALID_PACKET;
}
/* now try to find key */
LOAD32L(ID,in+4);
kr = kr_find(pk, ID);
if (kr == NULL) {
return CRYPT_PK_NOT_FOUND;
}
/* is it public? */
if (kr->key_type == PK_PUBLIC) {
return CRYPT_PK_NOT_PRIVATE;
}
/* now try and decrypt it */
len = sizeof(buf);
switch (kr->system) {
case RSA_KEY:
if ((errno = rsa_decrypt_key(in+8, buf, &len, &(kr->key.rsa))) != CRYPT_OK) {
return errno;
}
break;
case DH_KEY:
if ((errno = dh_decrypt_key(in+8, buf, &len, &(kr->key.dh))) != CRYPT_OK) {
return errno;
}
break;
case ECC_KEY:
if ((errno = ecc_decrypt_key(in+8, buf, &len, &(kr->key.ecc))) != CRYPT_OK) {
return errno;
}
break;
}
if (len > *outlen) {
#ifdef CLEAN_STACK
zeromem(buf, sizeof(buf));
#endif
return CRYPT_BUFFER_OVERFLOW;
} else {
memcpy(out, buf, len);
#ifdef CLEAN_STACK
zeromem(buf, sizeof(buf));
#endif
*outlen = len;
return CRYPT_OK;
}
}
int kr_sign_hash(pk_key *pk, unsigned long ID,
const unsigned char *in, unsigned long inlen,
unsigned char *out, unsigned long *outlen,
prng_state *prng, int wprng)
{
unsigned char buf[8192];
unsigned long len;
pk_key *kr;
int errno;
_ARGCHK(pk != NULL);
_ARGCHK(in != NULL);
_ARGCHK(out != NULL);
_ARGCHK(outlen != NULL);
/* find the key */
kr = kr_find(pk, ID);
if (kr == NULL) {
return CRYPT_PK_NOT_FOUND;
}
/* is it public? */
if (kr->key_type == PK_PUBLIC) {
return CRYPT_PK_NOT_PRIVATE;
}
/* store the header */
memcpy(buf, sign_magic, 4);
/* now store the ID */
STORE32L(kr->ID,buf+4);
/* now sign it */
len = sizeof(buf)-12;
switch (kr->system) {
case RSA_KEY:
if ((errno = rsa_sign_hash(in, inlen, buf+12, &len, &(kr->key.rsa))) != CRYPT_OK) {
return errno;
}
break;
case DH_KEY:
if ((errno = dh_sign_hash(in, inlen, buf+12, &len, prng, wprng, &(kr->key.dh))) != CRYPT_OK) {
return errno;
}
break;
case ECC_KEY:
if ((errno = ecc_sign_hash(in, inlen, buf+12, &len, prng, wprng, &(kr->key.ecc))) != CRYPT_OK) {
return errno;
}
break;
}
STORE32L(inlen,buf+8);
len += 12;
if (len > *outlen) {
#ifdef CLEAN_STACK
zeromem(buf, sizeof(buf));
#endif
return CRYPT_BUFFER_OVERFLOW;
} else {
memcpy(out, buf, len);
#ifdef CLEAN_STACK
zeromem(buf, sizeof(buf));
#endif
*outlen = len;
return CRYPT_OK;
}
}
int kr_verify_hash(pk_key *pk, const unsigned char *in, const unsigned char *hash,
unsigned long hashlen, int *stat)
{
unsigned long inlen, ID;
pk_key *kr;
int errno;
_ARGCHK(pk != NULL);
_ARGCHK(in != NULL);
_ARGCHK(hash != NULL);
_ARGCHK(stat != NULL);
/* default to not match */
*stat = 0;
/* check magic header */
if (memcmp(in, sign_magic, 4)) {
return CRYPT_INVALID_PACKET;
}
/* now try to find key */
LOAD32L(ID,in+4);
kr = kr_find(pk, ID);
if (kr == NULL) {
return CRYPT_PK_NOT_FOUND;
}
/* now try and verify it */
LOAD32L(inlen,in+8); /* this is the length of the original inlen */
if (inlen != hashlen) { /* size doesn't match means the signature is invalid */
return CRYPT_OK;
}
switch (kr->system) {
case RSA_KEY:
if ((errno = rsa_verify_hash(in+12, hash, stat, &(kr->key.rsa))) != CRYPT_OK) {
return errno;
}
break;
case DH_KEY:
if ((errno = dh_verify_hash(in+12, hash, inlen, stat, &(kr->key.dh))) != CRYPT_OK) {
return errno;
}
break;
case ECC_KEY:
if ((errno = ecc_verify_hash(in+12, hash, inlen, stat, &(kr->key.ecc))) != CRYPT_OK) {
return errno;
}
break;
}
return CRYPT_OK;
}
int kr_fingerprint(pk_key *pk, unsigned long ID, int hash,
unsigned char *out, unsigned long *outlen)
{
unsigned char buf[8192];
unsigned long len;
int errno;
_ARGCHK(pk != NULL);
_ARGCHK(out != NULL);
_ARGCHK(outlen != NULL);
/* valid hash? */
if ((errno = hash_is_valid(hash)) != CRYPT_OK) {
return errno;
}
len = sizeof(buf);
if ((errno = kr_export(pk, ID, PK_PUBLIC, buf, &len)) != CRYPT_OK) {
return errno;
}
/* now hash it */
if ((errno = hash_memory(hash, buf, len, out, outlen)) != CRYPT_OK) {
return errno;
}
#ifdef CLEAN_STACK
zeromem(buf, sizeof(buf));
#endif
return CRYPT_OK;
}
#endif
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