dropbear: gensignkey.c annotate

annotate gensignkey.c @ 1060:4c733310c21d nocircbuffer

reword comment for clarity

author	Matt Johnston <matt@ucc.asn.au>
date	Sun, 01 Mar 2015 23:26:42 +0800
parents	2b62f26cf808
children	2bb4c662d1c2

rev	line source
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1 #include "includes.h"
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	2 #include "dbutil.h"
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	3 #include "buffer.h"
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	4 #include "ecdsa.h"
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	5 #include "genrsa.h"
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	6 #include "gendss.h"
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	7 #include "signkey.h"
858 220f55d540ae rename random.h to dbrandom.h since some OSes have a system random.h Matt Johnston <matt@ucc.asn.au> parents: 857 diff changeset	8 #include "dbrandom.h"
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	9
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	10 #define RSA_DEFAULT_SIZE 2048
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	11 #define DSS_DEFAULT_SIZE 1024
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	12
857 c19acba28590 use oldstyle comments Matt Johnston <matt@ucc.asn.au> parents: 855 diff changeset	13 /* Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	14 static int buf_writefile(buffer * buf, const char * filename) {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	15 int ret = DROPBEAR_FAILURE;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	16 int fd = -1;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	17
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	18 fd = open(filename, O_RDWR \| O_CREAT \| O_EXCL, S_IRUSR \| S_IWUSR);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	19 if (fd < 0) {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	20 dropbear_log(LOG_ERR, "Couldn't create new file %s: %s",
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	21 filename, strerror(errno));
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	22 goto out;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	23 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	24
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	25 /* write the file now */
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	26 while (buf->pos != buf->len) {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	27 int len = write(fd, buf_getptr(buf, buf->len - buf->pos),
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	28 buf->len - buf->pos);
888 6e6ae84d3dba Fix check for EINTR Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	29 if (len == -1 && errno == EINTR) {
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	30 continue;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	31 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	32 if (len <= 0) {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	33 dropbear_log(LOG_ERR, "Failed writing file %s: %s",
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	34 filename, strerror(errno));
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	35 goto out;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	36 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	37 buf_incrpos(buf, len);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	38 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	39
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	40 ret = DROPBEAR_SUCCESS;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	41
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	42 out:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	43 if (fd >= 0) {
983 2b62f26cf808 Open directories O_RDONLY for fsync, add debugging if it fails Matt Johnston <matt@ucc.asn.au> parents: 982 diff changeset	44 if (fsync(fd) != 0) {
2b62f26cf808 Open directories O_RDONLY for fsync, add debugging if it fails Matt Johnston <matt@ucc.asn.au> parents: 982 diff changeset	45 dropbear_log(LOG_ERR, "fsync of %s failed: %s", filename, strerror(errno));
2b62f26cf808 Open directories O_RDONLY for fsync, add debugging if it fails Matt Johnston <matt@ucc.asn.au> parents: 982 diff changeset	46 }
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	47 m_close(fd);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	48 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	49 return ret;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	50 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	51
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	52 /* returns 0 on failure */
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	53 static int get_default_bits(enum signkey_type keytype)
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	54 {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	55 switch (keytype) {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	56 #ifdef DROPBEAR_RSA
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	57 case DROPBEAR_SIGNKEY_RSA:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	58 return RSA_DEFAULT_SIZE;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	59 #endif
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	60 #ifdef DROPBEAR_DSS
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	61 case DROPBEAR_SIGNKEY_DSS:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	62 return DSS_DEFAULT_SIZE;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	63 #endif
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	64 #ifdef DROPBEAR_ECDSA
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	65 case DROPBEAR_SIGNKEY_ECDSA_KEYGEN:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	66 return ECDSA_DEFAULT_SIZE;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	67 case DROPBEAR_SIGNKEY_ECDSA_NISTP521:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	68 return 521;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	69 case DROPBEAR_SIGNKEY_ECDSA_NISTP384:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	70 return 384;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	71 case DROPBEAR_SIGNKEY_ECDSA_NISTP256:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	72 return 256;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	73 #endif
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	74 default:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	75 return 0;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	76 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	77 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	78
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	79 int signkey_generate(enum signkey_type keytype, int bits, const char* filename)
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	80 {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	81 sign_key * key = NULL;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	82 buffer *buf = NULL;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	83 int ret = DROPBEAR_FAILURE;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	84 if (bits == 0)
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	85 {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	86 bits = get_default_bits(keytype);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	87 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	88
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	89 /* now we can generate the key */
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	90 key = new_sign_key();
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	91
852 7540c0822374 Various cleanups and fixes for warnings Matt Johnston <matt@ucc.asn.au> parents: 847 diff changeset	92 seedrandom();
7540c0822374 Various cleanups and fixes for warnings Matt Johnston <matt@ucc.asn.au> parents: 847 diff changeset	93
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	94 switch(keytype) {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	95 #ifdef DROPBEAR_RSA
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	96 case DROPBEAR_SIGNKEY_RSA:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	97 key->rsakey = gen_rsa_priv_key(bits);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	98 break;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	99 #endif
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	100 #ifdef DROPBEAR_DSS
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	101 case DROPBEAR_SIGNKEY_DSS:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	102 key->dsskey = gen_dss_priv_key(bits);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	103 break;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	104 #endif
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	105 #ifdef DROPBEAR_ECDSA
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	106 case DROPBEAR_SIGNKEY_ECDSA_KEYGEN:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	107 case DROPBEAR_SIGNKEY_ECDSA_NISTP521:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	108 case DROPBEAR_SIGNKEY_ECDSA_NISTP384:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	109 case DROPBEAR_SIGNKEY_ECDSA_NISTP256:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	110 {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	111 ecc_key *ecckey = gen_ecdsa_priv_key(bits);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	112 keytype = ecdsa_signkey_type(ecckey);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	113 *signkey_key_ptr(key, keytype) = ecckey;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	114 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	115 break;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	116 #endif
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	117 default:
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	118 dropbear_exit("Internal error");
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	119 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	120
852 7540c0822374 Various cleanups and fixes for warnings Matt Johnston <matt@ucc.asn.au> parents: 847 diff changeset	121 seedrandom();
7540c0822374 Various cleanups and fixes for warnings Matt Johnston <matt@ucc.asn.au> parents: 847 diff changeset	122
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	123 buf = buf_new(MAX_PRIVKEY_SIZE);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	124
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	125 buf_put_priv_key(buf, key, keytype);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	126 sign_key_free(key);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	127 key = NULL;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	128 buf_setpos(buf, 0);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	129 ret = buf_writefile(buf, filename);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	130
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	131 buf_burn(buf);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	132 buf_free(buf);
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	133 buf = NULL;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	134 return ret;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: diff changeset	135 }

Mercurial > dropbear

annotate gensignkey.c @ 1060:4c733310c21d nocircbuffer