/* * hostkey_method_ssh_dss_init * * Initialize the server hostkey working area with p/q/g/y set */ static int hostkey_method_ssh_dss_init(LIBSSH2_SESSION * session, const unsigned char *hostkey_data, size_t hostkey_data_len, void **abstract) { libssh2_dsa_ctx *dsactx; const unsigned char *p, *q, *g, *y, *s; unsigned long p_len, q_len, g_len, y_len, len; int ret; (void) hostkey_data_len; if (*abstract) { hostkey_method_ssh_dss_dtor(session, abstract); *abstract = NULL; } s = hostkey_data; len = _libssh2_ntohu32(s); s += 4; if (len != 7 || strncmp((char *) s, "ssh-dss", 7) != 0) { return -1; } s += 7; p_len = _libssh2_ntohu32(s); s += 4; p = s; s += p_len; q_len = _libssh2_ntohu32(s); s += 4; q = s; s += q_len; g_len = _libssh2_ntohu32(s); s += 4; g = s; s += g_len; y_len = _libssh2_ntohu32(s); s += 4; y = s; /* s += y_len; */ ret = _libssh2_dsa_new(&dsactx, p, p_len, q, q_len, g, g_len, y, y_len, NULL, 0); if (ret) { return -1; } *abstract = dsactx; return 0; }
int _libssh2_dsa_new_private(libssh2_dsa_ctx ** dsa, LIBSSH2_SESSION * session, const char *filename, unsigned const char *passphrase) { FILE *fp; unsigned char *data, *save_data; unsigned int datalen; int ret; unsigned char *p, *q, *g, *y, *x; unsigned int plen, qlen, glen, ylen, xlen; fp = fopen(filename, FOPEN_READTEXT); if(!fp) { return -1; } ret = _libssh2_pem_parse(session, "-----BEGIN DSA PRIVATE KEY-----", "-----END DSA PRIVATE KEY-----", passphrase, fp, &data, &datalen); fclose(fp); if(ret) { return -1; } save_data = data; if(_libssh2_pem_decode_sequence(&data, &datalen)) { ret = -1; goto fail; } /* First read Version field (should be 0). */ ret = _libssh2_pem_decode_integer(&data, &datalen, &p, &plen); if(ret != 0 || (plen != 1 && *p != '\0')) { ret = -1; goto fail; } ret = _libssh2_pem_decode_integer(&data, &datalen, &p, &plen); if(ret != 0) { ret = -1; goto fail; } ret = _libssh2_pem_decode_integer(&data, &datalen, &q, &qlen); if(ret != 0) { ret = -1; goto fail; } ret = _libssh2_pem_decode_integer(&data, &datalen, &g, &glen); if(ret != 0) { ret = -1; goto fail; } ret = _libssh2_pem_decode_integer(&data, &datalen, &y, &ylen); if(ret != 0) { ret = -1; goto fail; } ret = _libssh2_pem_decode_integer(&data, &datalen, &x, &xlen); if(ret != 0) { ret = -1; goto fail; } if(datalen != 0) { ret = -1; goto fail; } if(_libssh2_dsa_new(dsa, p, plen, q, qlen, g, glen, y, ylen, x, xlen)) { ret = -1; goto fail; } ret = 0; fail: LIBSSH2_FREE(session, save_data); return ret; }