Mercurial > dropbear
diff keyring.c @ 144:7ed585a2c53b libtomcrypt
propagate of 3f8f752126017cbe7d93c4086c27a91550df745f and 747ebf284d40a15b338e5a5c7730ecec6eade3d7 from branch 'au.asn.ucc.matt.ltc-orig' to 'au.asn.ucc.matt.ltc-db'
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Sun, 19 Dec 2004 11:47:33 +0000 |
parents | d7da3b1e1540 |
children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/keyring.c Sun Dec 19 11:47:33 2004 +0000 @@ -0,0 +1,862 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, [email protected], http://libtomcrypt.org + */ +/* 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] = { + 0x00000000UL, 0x77073096UL, 0xee0e612cUL, 0x990951baUL, 0x076dc419UL, + 0x706af48fUL, 0xe963a535UL, 0x9e6495a3UL, 0x0edb8832UL, 0x79dcb8a4UL, + 0xe0d5e91eUL, 0x97d2d988UL, 0x09b64c2bUL, 0x7eb17cbdUL, 0xe7b82d07UL, + 0x90bf1d91UL, 0x1db71064UL, 0x6ab020f2UL, 0xf3b97148UL, 0x84be41deUL, + 0x1adad47dUL, 0x6ddde4ebUL, 0xf4d4b551UL, 0x83d385c7UL, 0x136c9856UL, + 0x646ba8c0UL, 0xfd62f97aUL, 0x8a65c9ecUL, 0x14015c4fUL, 0x63066cd9UL, + 0xfa0f3d63UL, 0x8d080df5UL, 0x3b6e20c8UL, 0x4c69105eUL, 0xd56041e4UL, + 0xa2677172UL, 0x3c03e4d1UL, 0x4b04d447UL, 0xd20d85fdUL, 0xa50ab56bUL, + 0x35b5a8faUL, 0x42b2986cUL, 0xdbbbc9d6UL, 0xacbcf940UL, 0x32d86ce3UL, + 0x45df5c75UL, 0xdcd60dcfUL, 0xabd13d59UL, 0x26d930acUL, 0x51de003aUL, + 0xc8d75180UL, 0xbfd06116UL, 0x21b4f4b5UL, 0x56b3c423UL, 0xcfba9599UL, + 0xb8bda50fUL, 0x2802b89eUL, 0x5f058808UL, 0xc60cd9b2UL, 0xb10be924UL, + 0x2f6f7c87UL, 0x58684c11UL, 0xc1611dabUL, 0xb6662d3dUL, 0x76dc4190UL, + 0x01db7106UL, 0x98d220bcUL, 0xefd5102aUL, 0x71b18589UL, 0x06b6b51fUL, + 0x9fbfe4a5UL, 0xe8b8d433UL, 0x7807c9a2UL, 0x0f00f934UL, 0x9609a88eUL, + 0xe10e9818UL, 0x7f6a0dbbUL, 0x086d3d2dUL, 0x91646c97UL, 0xe6635c01UL, + 0x6b6b51f4UL, 0x1c6c6162UL, 0x856530d8UL, 0xf262004eUL, 0x6c0695edUL, + 0x1b01a57bUL, 0x8208f4c1UL, 0xf50fc457UL, 0x65b0d9c6UL, 0x12b7e950UL, + 0x8bbeb8eaUL, 0xfcb9887cUL, 0x62dd1ddfUL, 0x15da2d49UL, 0x8cd37cf3UL, + 0xfbd44c65UL, 0x4db26158UL, 0x3ab551ceUL, 0xa3bc0074UL, 0xd4bb30e2UL, + 0x4adfa541UL, 0x3dd895d7UL, 0xa4d1c46dUL, 0xd3d6f4fbUL, 0x4369e96aUL, + 0x346ed9fcUL, 0xad678846UL, 0xda60b8d0UL, 0x44042d73UL, 0x33031de5UL, + 0xaa0a4c5fUL, 0xdd0d7cc9UL, 0x5005713cUL, 0x270241aaUL, 0xbe0b1010UL, + 0xc90c2086UL, 0x5768b525UL, 0x206f85b3UL, 0xb966d409UL, 0xce61e49fUL, + 0x5edef90eUL, 0x29d9c998UL, 0xb0d09822UL, 0xc7d7a8b4UL, 0x59b33d17UL, + 0x2eb40d81UL, 0xb7bd5c3bUL, 0xc0ba6cadUL, 0xedb88320UL, 0x9abfb3b6UL, + 0x03b6e20cUL, 0x74b1d29aUL, 0xead54739UL, 0x9dd277afUL, 0x04db2615UL, + 0x73dc1683UL, 0xe3630b12UL, 0x94643b84UL, 0x0d6d6a3eUL, 0x7a6a5aa8UL, + 0xe40ecf0bUL, 0x9309ff9dUL, 0x0a00ae27UL, 0x7d079eb1UL, 0xf00f9344UL, + 0x8708a3d2UL, 0x1e01f268UL, 0x6906c2feUL, 0xf762575dUL, 0x806567cbUL, + 0x196c3671UL, 0x6e6b06e7UL, 0xfed41b76UL, 0x89d32be0UL, 0x10da7a5aUL, + 0x67dd4accUL, 0xf9b9df6fUL, 0x8ebeeff9UL, 0x17b7be43UL, 0x60b08ed5UL, + 0xd6d6a3e8UL, 0xa1d1937eUL, 0x38d8c2c4UL, 0x4fdff252UL, 0xd1bb67f1UL, + 0xa6bc5767UL, 0x3fb506ddUL, 0x48b2364bUL, 0xd80d2bdaUL, 0xaf0a1b4cUL, + 0x36034af6UL, 0x41047a60UL, 0xdf60efc3UL, 0xa867df55UL, 0x316e8eefUL, + 0x4669be79UL, 0xcb61b38cUL, 0xbc66831aUL, 0x256fd2a0UL, 0x5268e236UL, + 0xcc0c7795UL, 0xbb0b4703UL, 0x220216b9UL, 0x5505262fUL, 0xc5ba3bbeUL, + 0xb2bd0b28UL, 0x2bb45a92UL, 0x5cb36a04UL, 0xc2d7ffa7UL, 0xb5d0cf31UL, + 0x2cd99e8bUL, 0x5bdeae1dUL, 0x9b64c2b0UL, 0xec63f226UL, 0x756aa39cUL, + 0x026d930aUL, 0x9c0906a9UL, 0xeb0e363fUL, 0x72076785UL, 0x05005713UL, + 0x95bf4a82UL, 0xe2b87a14UL, 0x7bb12baeUL, 0x0cb61b38UL, 0x92d28e9bUL, + 0xe5d5be0dUL, 0x7cdcefb7UL, 0x0bdbdf21UL, 0x86d3d2d4UL, 0xf1d4e242UL, + 0x68ddb3f8UL, 0x1fda836eUL, 0x81be16cdUL, 0xf6b9265bUL, 0x6fb077e1UL, + 0x18b74777UL, 0x88085ae6UL, 0xff0f6a70UL, 0x66063bcaUL, 0x11010b5cUL, + 0x8f659effUL, 0xf862ae69UL, 0x616bffd3UL, 0x166ccf45UL, 0xa00ae278UL, + 0xd70dd2eeUL, 0x4e048354UL, 0x3903b3c2UL, 0xa7672661UL, 0xd06016f7UL, + 0x4969474dUL, 0x3e6e77dbUL, 0xaed16a4aUL, 0xd9d65adcUL, 0x40df0b66UL, + 0x37d83bf0UL, 0xa9bcae53UL, 0xdebb9ec5UL, 0x47b2cf7fUL, 0x30b5ffe9UL, + 0xbdbdf21cUL, 0xcabac28aUL, 0x53b39330UL, 0x24b4a3a6UL, 0xbad03605UL, + 0xcdd70693UL, 0x54de5729UL, 0x23d967bfUL, 0xb3667a2eUL, 0xc4614ab8UL, + 0x5d681b02UL, 0x2a6f2b94UL, 0xb40bbe37UL, 0xc30c8ea1UL, 0x5a05df1bUL, + 0x2d02ef8dUL +}; + +#define DO1(buf) crc = crc_table[(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) +{ + //_ARGCHK(buf != NULL && len == 0); + crc = crc ^ 0xffffffffL; + while (len >= 8) { + DO8 (buf); + len -= 8; + } + + if (len > 0) { + do { + DO1 (buf); + } while (--len > 0); + } + 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(0UL, NULL, 0UL); + crc = crc32(crc, name, (unsigned long)MIN(MAXLEN, strlen((char *)name))); + crc = crc32(crc, email, (unsigned long)MIN(MAXLEN, strlen((char *)email))); + return crc32(crc, description, (unsigned long)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) == 0) { + return pk; + } + pk = pk->next; + } + return NULL; +} + + +int kr_add(pk_key *pk, int key_type, int sys, 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 (sys != RSA_KEY && sys != DH_KEY && sys != 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 = sys; + 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 (sys) { + 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 err; + _ARGCHK(pk != NULL); + + while ((*pk)->system != NON_KEY) { + if ((err = kr_del(pk, (*pk)->ID)) != CRYPT_OK) { + return err; + } + } + 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 (unsigned long)fwrite(buf, 1, (size_t)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 = (unsigned long)fread(buf, 1, (size_t)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 err; + + _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 ((err = rsa_export(obuf, &len, key_type, &(ppk->key.rsa))) != CRYPT_OK) { + return err; + } + break; + case DH_KEY: + if ((err = dh_export(obuf, &len, key_type, &(ppk->key.dh))) != CRYPT_OK) { + return err; + } + break; + case ECC_KEY: + if ((err = ecc_export(obuf, &len, key_type, &(ppk->key.ecc))) != CRYPT_OK) { + return err; + } + 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, unsigned long inlen) +{ + _pk_key key; + int sys, key_type, err; + unsigned long ID; + + _ARGCHK(pk != NULL); + _ARGCHK(in != NULL); + + if (inlen < 10) { + return CRYPT_INVALID_PACKET; + } + + if (memcmp(in, key_magic, 4) != 0) { + return CRYPT_INVALID_PACKET; + } + key_type = in[4]; /* get type */ + sys = 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)); + + /* size of remaining packet */ + inlen -= 10 + 3*MAXLEN; + + switch (sys) { + case RSA_KEY: + if ((err = rsa_import(in+10+3*MAXLEN, inlen, &(key.rsa))) != CRYPT_OK) { + return err; + } + break; + case DH_KEY: + if ((err = dh_import(in+10+3*MAXLEN, inlen, &(key.dh))) != CRYPT_OK) { + return err; + } + break; + case ECC_KEY: + if ((err = ecc_import(in+10+3*MAXLEN, inlen, &(key.ecc))) != CRYPT_OK) { + return err; + } + break; + } + return kr_add(pk, key_type, sys, + 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, err; + + _ARGCHK(pk != NULL); + _ARGCHK(in != NULL); + + /* init keyring */ + if ((err = kr_init(pk)) != CRYPT_OK) { + return err; + } + + /* read in magic bytes */ + if (_read(buf, 6, in, ctr) != 6) { goto done2; } + + if (memcmp(buf, file_magic, 4) != 0) { + 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 > (unsigned long)sizeof(buf)) { + return CRYPT_INVALID_PACKET; + } + + if (_read(buf, len, in, ctr) != len) { goto done2; } + if ((err = kr_import(*pk, buf, len)) != CRYPT_OK) { + return err; + } + } + + 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, err; + + _ARGCHK(pk != NULL); + _ARGCHK(out != NULL); + + /* write out magic bytes */ + memcpy(buf, file_magic, 4); + buf[4] = (unsigned char)(CRYPT&255); + buf[5] = (unsigned char)((CRYPT>>8)&255); + if (_write(buf, 6, out, ctr) != 6) { goto done2; } + + while (pk->system != NON_KEY) { + len = sizeof(buf); + if ((err = kr_export(pk, pk->ID, pk->key_type, buf, &len)) != CRYPT_OK) { + return err; + } + + 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 sys, int keysize, const unsigned char *name, + const unsigned char *email, const unsigned char *description) +{ + _pk_key key; + int key_type, err; + + _ARGCHK(pk != NULL); + _ARGCHK(name != NULL); + _ARGCHK(email != NULL); + _ARGCHK(description != NULL); + + /* valid PRNG? */ + if ((err = prng_is_valid(wprng)) != CRYPT_OK) { + return err; + } + + /* make the key first */ + zeromem(&key, sizeof(key)); + switch (sys) { + case RSA_KEY: + if ((err = rsa_make_key(prng, wprng, keysize, 65537, &(key.rsa))) != CRYPT_OK) { + return err; + } + key_type = key.rsa.type; + break; + case DH_KEY: + if ((err = dh_make_key(prng, wprng, keysize, &(key.dh))) != CRYPT_OK) { + return err; + } + key_type = key.dh.type; + break; + case ECC_KEY: + if ((err = ecc_make_key(prng, wprng, keysize, &(key.ecc))) != CRYPT_OK) { + return err; + } + key_type = key.ecc.type; + break; + default: + return CRYPT_PK_INVALID_SYSTEM; + } + + /* now add the key */ + if ((err = kr_add(pk, key_type, sys, name, email, description, &key)) != CRYPT_OK) { + return err; + } + +#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 err; + + _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)-12; + switch (kr->system) { + case RSA_KEY: + if ((err = rsa_encrypt_key(in, inlen, buf+12, &len, prng, wprng, &(kr->key.rsa))) != CRYPT_OK) { + return err; + } + break; + case DH_KEY: + if ((err = dh_encrypt_key(in, inlen, buf+12, &len, prng, wprng, hash, &(kr->key.dh))) != CRYPT_OK) { + return err; + } + break; + case ECC_KEY: + if ((err = ecc_encrypt_key(in, inlen, buf+12, &len, prng, wprng, hash, &(kr->key.ecc))) != CRYPT_OK) { + return err; + } + break; + } + STORE32L(len,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_decrypt_key(pk_key *pk, const unsigned char *in, + unsigned char *out, unsigned long *outlen) +{ + unsigned char buf[8192]; + unsigned long pklen, len, ID; + pk_key *kr; + int err; + + _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 */ + LOAD32L(pklen,in+8); + len = sizeof(buf); + switch (kr->system) { + case RSA_KEY: + if ((err = rsa_decrypt_key(in+12, pklen, buf, &len, &(kr->key.rsa))) != CRYPT_OK) { + return err; + } + break; + case DH_KEY: + if ((err = dh_decrypt_key(in+12, pklen, buf, &len, &(kr->key.dh))) != CRYPT_OK) { + return err; + } + break; + case ECC_KEY: + if ((err = ecc_decrypt_key(in+12, pklen, buf, &len, &(kr->key.ecc))) != CRYPT_OK) { + return err; + } + 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 err; + + _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)-16; + switch (kr->system) { + case RSA_KEY: + if ((err = rsa_sign_hash(in, inlen, buf+16, &len, &(kr->key.rsa))) != CRYPT_OK) { + return err; + } + break; + case DH_KEY: + if ((err = dh_sign_hash(in, inlen, buf+16, &len, prng, wprng, &(kr->key.dh))) != CRYPT_OK) { + return err; + } + break; + case ECC_KEY: + if ((err = ecc_sign_hash(in, inlen, buf+16, &len, prng, wprng, &(kr->key.ecc))) != CRYPT_OK) { + return err; + } + break; + } + STORE32L(inlen,buf+8); + STORE32L(len,buf+12); + len += 16; + + 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, pklen, ID; + pk_key *kr; + int err; + + _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 */ + LOAD32L(pklen,in+12); /* size of the PK packet */ + if (inlen != hashlen) { /* size doesn't match means the signature is invalid */ + return CRYPT_OK; + } + + switch (kr->system) { + case RSA_KEY: + if ((err = rsa_verify_hash(in+16, pklen, hash, stat, &(kr->key.rsa))) != CRYPT_OK) { + return err; + } + break; + case DH_KEY: + if ((err = dh_verify_hash(in+16, pklen, hash, inlen, stat, &(kr->key.dh))) != CRYPT_OK) { + return err; + } + break; + case ECC_KEY: + if ((err = ecc_verify_hash(in+16, pklen, hash, inlen, stat, &(kr->key.ecc))) != CRYPT_OK) { + return err; + } + 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 err; + + _ARGCHK(pk != NULL); + _ARGCHK(out != NULL); + _ARGCHK(outlen != NULL); + + /* valid hash? */ + if ((err = hash_is_valid(hash)) != CRYPT_OK) { + return err; + } + + len = (unsigned long)sizeof(buf); + if ((err = kr_export(pk, ID, PK_PUBLIC, buf, &len)) != CRYPT_OK) { + return err; + } + + /* now hash it */ + if ((err = hash_memory(hash, buf, len, out, outlen)) != CRYPT_OK) { + return err; + } + +#ifdef CLEAN_STACK + zeromem(buf, sizeof(buf)); +#endif + return CRYPT_OK; +} + +#endif + +