Added support code for RSA and EC key encoding (including reconstruction of all public and private key elements from the private key structure), with raw and PKCS#8 formats, both in DER and PEM.
This commit is contained in:
Thomas Pornin
parent
cfbc702d3d
commit
d8fa415fca
32 changed files with 3528 additions and 105 deletions
419
tools/skey.c
419
tools/skey.c
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@ -31,6 +31,15 @@
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#include "brssl.h"
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#include "bearssl.h"
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typedef struct {
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int print_text;
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int print_C;
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const char *rawder;
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const char *rawpem;
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const char *pk8der;
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const char *pk8pem;
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} outspec;
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static void
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print_int_text(const char *name, const unsigned char *buf, size_t len)
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{
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@ -63,17 +72,70 @@ print_int_C(const char *name, const unsigned char *buf, size_t len)
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printf("\n};\n");
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}
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static void
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print_rsa(const br_rsa_private_key *sk, int print_text, int print_C)
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static int
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write_to_file(const char *name, const void *data, size_t len)
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{
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if (print_text) {
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FILE *f;
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f = fopen(name, "wb");
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if (f == NULL) {
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fprintf(stderr,
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"ERROR: cannot open file '%s' for writing\n",
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name);
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return 0;
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}
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if (fwrite(data, 1, len, f) != len) {
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fclose(f);
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fprintf(stderr,
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"ERROR: cannot write to file '%s'\n",
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name);
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return 0;
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}
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fclose(f);
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return 1;
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}
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static int
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write_to_pem_file(const char *name,
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const void *data, size_t len, const char *banner)
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{
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void *pem;
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size_t pemlen;
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int r;
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pemlen = br_pem_encode(NULL, NULL, len, banner, 0);
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pem = xmalloc(pemlen + 1);
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br_pem_encode(pem, data, len, banner, 0);
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r = write_to_file(name, pem, pemlen);
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xfree(pem);
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return r;
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}
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static int
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print_rsa(const br_rsa_private_key *sk, outspec *os)
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{
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int ret;
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unsigned char *n, *d, *buf;
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uint32_t e;
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size_t nlen, dlen, len;
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br_rsa_compute_modulus cm;
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br_rsa_compute_pubexp ce;
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br_rsa_compute_privexp cd;
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br_rsa_public_key pk;
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unsigned char ebuf[4];
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n = NULL;
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d = NULL;
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buf = NULL;
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ret = 1;
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if (os->print_text) {
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print_int_text("p ", sk->p, sk->plen);
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print_int_text("q ", sk->q, sk->qlen);
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print_int_text("dp", sk->dp, sk->dplen);
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print_int_text("dq", sk->dq, sk->dqlen);
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print_int_text("iq", sk->iq, sk->iqlen);
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}
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if (print_C) {
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if (os->print_C) {
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print_int_C("RSA_P", sk->p, sk->plen);
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print_int_C("RSA_Q", sk->q, sk->qlen);
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print_int_C("RSA_DP", sk->dp, sk->dplen);
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@ -88,21 +150,174 @@ print_rsa(const br_rsa_private_key *sk, int print_text, int print_C)
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printf("\t(unsigned char *)RSA_IQ, sizeof RSA_IQ\n");
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printf("};\n");
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}
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if (os->rawder == NULL && os->rawpem == NULL
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&& os->pk8der == NULL && os->pk8pem == NULL)
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{
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return ret;
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}
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cm = br_rsa_compute_modulus_get_default();
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ce = br_rsa_compute_pubexp_get_default();
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cd = br_rsa_compute_privexp_get_default();
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nlen = cm(NULL, sk);
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if (nlen == 0) {
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goto print_RSA_error;
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}
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n = xmalloc(nlen);
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if (cm(n, sk) != nlen) {
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goto print_RSA_error;
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}
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e = ce(sk);
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if (e == 0) {
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goto print_RSA_error;
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}
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dlen = cd(NULL, sk, e);
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if (dlen == 0) {
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goto print_RSA_error;
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}
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d = xmalloc(dlen);
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if (cd(d, sk, e) != dlen) {
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goto print_RSA_error;
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}
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ebuf[0] = e >> 24;
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ebuf[1] = e >> 16;
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ebuf[2] = e >> 8;
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ebuf[3] = e;
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pk.n = n;
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pk.nlen = nlen;
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pk.e = ebuf;
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pk.elen = sizeof ebuf;
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if (os->rawder != NULL || os->rawpem != NULL) {
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len = br_encode_rsa_raw_der(NULL, sk, &pk, d, dlen);
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if (len == 0) {
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goto print_RSA_error;
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}
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buf = xmalloc(len);
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if (br_encode_rsa_raw_der(buf, sk, &pk, d, dlen) != len) {
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goto print_RSA_error;
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}
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if (os->rawder != NULL) {
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ret &= write_to_file(os->rawder, buf, len);
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}
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if (os->rawpem != NULL) {
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ret &= write_to_pem_file(os->rawpem,
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buf, len, "RSA PRIVATE KEY");
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}
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xfree(buf);
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buf = NULL;
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}
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if (os->pk8der != NULL || os->pk8pem != NULL) {
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len = br_encode_rsa_pkcs8_der(NULL, sk, &pk, d, dlen);
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if (len == 0) {
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goto print_RSA_error;
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}
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buf = xmalloc(len);
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if (br_encode_rsa_pkcs8_der(buf, sk, &pk, d, dlen) != len) {
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goto print_RSA_error;
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}
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if (os->pk8der != NULL) {
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ret &= write_to_file(os->pk8der, buf, len);
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}
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if (os->pk8pem != NULL) {
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ret &= write_to_pem_file(os->pk8pem,
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buf, len, "PRIVATE KEY");
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}
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xfree(buf);
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buf = NULL;
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}
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print_RSA_exit:
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xfree(n);
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xfree(d);
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xfree(buf);
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return ret;
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print_RSA_error:
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fprintf(stderr, "ERROR: cannot encode RSA key\n");
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ret = 0;
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goto print_RSA_exit;
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}
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static void
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print_ec(const br_ec_private_key *sk, int print_text, int print_C)
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static int
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print_ec(const br_ec_private_key *sk, outspec *os)
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{
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if (print_text) {
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br_ec_public_key pk;
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unsigned kbuf[BR_EC_KBUF_PUB_MAX_SIZE];
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unsigned char *buf;
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size_t len;
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int r;
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if (os->print_text) {
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print_int_text("x", sk->x, sk->xlen);
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}
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if (print_C) {
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if (os->print_C) {
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print_int_C("EC_X", sk->x, sk->xlen);
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printf("\nstatic const br_ec_private_key EC = {\n");
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printf("\t%d,\n", sk->curve);
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printf("\t(unsigned char *)EC_X, sizeof EC_X\n");
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printf("};\n");
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}
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if (os->rawder == NULL && os->rawpem == NULL
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&& os->pk8der == NULL && os->pk8pem == NULL)
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{
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return 1;
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}
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if (br_ec_compute_pub(br_ec_get_default(), &pk, kbuf, sk) == 0) {
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fprintf(stderr,
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"ERROR: cannot re-encode (unsupported curve)\n");
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return 0;
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}
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r = 1;
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if (os->rawder != NULL || os->rawpem != NULL) {
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len = br_encode_ec_raw_der(NULL, sk, &pk);
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if (len == 0) {
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fprintf(stderr, "ERROR: cannot re-encode"
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" (unsupported curve)\n");
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return 0;
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}
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buf = xmalloc(len);
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if (br_encode_ec_raw_der(buf, sk, &pk) != len) {
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fprintf(stderr, "ERROR: re-encode failure\n");
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xfree(buf);
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return 0;
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}
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if (os->rawder != NULL) {
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r &= write_to_file(os->rawder, buf, len);
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}
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if (os->rawpem != NULL) {
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r &= write_to_pem_file(os->rawpem,
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buf, len, "EC PRIVATE KEY");
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}
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xfree(buf);
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}
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if (os->pk8der != NULL || os->pk8pem != NULL) {
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len = br_encode_ec_pkcs8_der(NULL, sk, &pk);
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if (len == 0) {
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fprintf(stderr, "ERROR: cannot re-encode"
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" (unsupported curve)\n");
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return 0;
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}
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buf = xmalloc(len);
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if (br_encode_ec_pkcs8_der(buf, sk, &pk) != len) {
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fprintf(stderr, "ERROR: re-encode failure\n");
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xfree(buf);
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return 0;
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}
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if (os->pk8der != NULL) {
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r &= write_to_file(os->pk8der, buf, len);
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}
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if (os->pk8pem != NULL) {
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r &= write_to_pem_file(os->pk8pem,
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buf, len, "PRIVATE KEY");
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}
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xfree(buf);
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}
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return r;
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}
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static int
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@ -158,7 +373,7 @@ parse_rsa_spec(const char *kgen_spec, unsigned *size, uint32_t *pubexp)
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}
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static int
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keygen_rsa(unsigned size, uint32_t pubexp, int print_text, int print_C)
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keygen_rsa(unsigned size, uint32_t pubexp, outspec *os)
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{
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br_hmac_drbg_context rng;
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br_prng_seeder seeder;
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@ -183,17 +398,72 @@ keygen_rsa(unsigned size, uint32_t pubexp, int print_text, int print_C)
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if (!r) {
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fprintf(stderr, "ERROR: RSA key pair generation failed\n");
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} else {
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print_rsa(&sk, print_text, print_C);
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r = print_rsa(&sk, os);
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}
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xfree(kbuf_priv);
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return r;
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}
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static int
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decode_key(const unsigned char *buf, size_t len, int print_text, int print_C)
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parse_ec_spec(const char *kgen_spec, int *curve)
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{
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const char *p;
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*curve = 0;
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p = kgen_spec;
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if (*p != 'e' && *p != 'E') {
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return 0;
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}
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p ++;
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if (*p != 'c' && *p != 'C') {
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return 0;
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}
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p ++;
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if (*p == 0) {
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*curve = BR_EC_secp256r1;
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return 1;
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}
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if (*p != ':') {
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return 0;
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}
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*curve = get_curve_by_name(p);
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return *curve > 0;
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}
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static int
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keygen_ec(int curve, outspec *os)
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{
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br_hmac_drbg_context rng;
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br_prng_seeder seeder;
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const br_ec_impl *impl;
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br_ec_private_key sk;
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unsigned char kbuf_priv[BR_EC_KBUF_PRIV_MAX_SIZE];
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size_t len;
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seeder = br_prng_seeder_system(NULL);
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if (seeder == 0) {
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fprintf(stderr, "ERROR: no system source of randomness\n");
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return 0;
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}
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br_hmac_drbg_init(&rng, &br_sha256_vtable, NULL, 0);
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if (!seeder(&rng.vtable)) {
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fprintf(stderr, "ERROR: system source of randomness failed\n");
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return 0;
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}
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impl = br_ec_get_default();
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len = br_ec_keygen(&rng.vtable, impl, &sk, kbuf_priv, curve);
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if (len == 0) {
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fprintf(stderr, "ERROR: curve is not supported\n");
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return 0;
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}
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return print_ec(&sk, os);
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}
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static int
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decode_key(const unsigned char *buf, size_t len, outspec *os)
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{
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br_skey_decoder_context dc;
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int err;
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int err, ret;
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br_skey_decoder_init(&dc);
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br_skey_decoder_push(&dc, buf, len);
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@ -208,8 +478,9 @@ decode_key(const unsigned char *buf, size_t len, int print_text, int print_C)
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} else {
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fprintf(stderr, " (unknown)\n");
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}
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return -1;
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return 0;
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}
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ret = 1;
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switch (br_skey_decoder_key_type(&dc)) {
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const br_rsa_private_key *rk;
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const br_ec_private_key *ek;
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@ -217,23 +488,24 @@ decode_key(const unsigned char *buf, size_t len, int print_text, int print_C)
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case BR_KEYTYPE_RSA:
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rk = br_skey_decoder_get_rsa(&dc);
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printf("RSA key (%lu bits)\n", (unsigned long)rk->n_bitlen);
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print_rsa(rk, print_text, print_C);
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ret = print_rsa(rk, os);
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break;
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case BR_KEYTYPE_EC:
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ek = br_skey_decoder_get_ec(&dc);
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printf("EC key (curve = %d: %s)\n",
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ek->curve, ec_curve_name(ek->curve));
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print_ec(ek, print_text, print_C);
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ret = print_ec(ek, os);
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break;
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default:
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fprintf(stderr, "Unknown key type: %d\n",
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br_skey_decoder_key_type(&dc));
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return -1;
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ret = 0;
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break;
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}
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return 0;
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return ret;
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}
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static void
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@ -244,19 +516,31 @@ usage_skey(void)
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fprintf(stderr,
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"options:\n");
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fprintf(stderr,
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" -q suppress verbose messages\n");
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" -q suppress verbose messages\n");
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fprintf(stderr,
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" -text print public key details (human-readable)\n");
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" -text print private key details (human-readable)\n");
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fprintf(stderr,
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" -C print public key details (C code)\n");
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" -C print private key details (C code)\n");
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fprintf(stderr,
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" -gen spec generate a new key using the provided key specification\n");
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" -rawder file save private key in 'file' (raw format, DER)\n");
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fprintf(stderr,
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" -rawpem file save private key in 'file' (raw format, PEM)\n");
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fprintf(stderr,
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" -pk8der file save private key in 'file' (PKCS#8 format, DER)\n");
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fprintf(stderr,
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" -pk8pem file save private key in 'file' (PKCS#8 format, PEM)\n");
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fprintf(stderr,
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" -gen spec generate a new key using the provided key specification\n");
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fprintf(stderr,
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" -list list known elliptic curve names\n");
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fprintf(stderr,
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"Key specification begins with a key type, followed by optional parameters\n");
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fprintf(stderr,
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"that depend on the key type, separated by colon characters:\n");
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fprintf(stderr,
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" rsa[:size[:pubexep]] RSA key (defaults: size = 2048, pubexp = 3)\n");
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fprintf(stderr,
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" ec[:curvename] EC key (default curve: secp256r1)\n");
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}
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/* see brssl.h */
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@ -266,7 +550,7 @@ do_skey(int argc, char *argv[])
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int retcode;
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int verbose;
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int i, num_files;
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int print_text, print_C;
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outspec os;
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unsigned char *buf;
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size_t len;
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pem_object *pos;
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@ -274,8 +558,12 @@ do_skey(int argc, char *argv[])
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retcode = 0;
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verbose = 1;
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print_text = 0;
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print_C = 0;
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os.print_text = 0;
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os.print_C = 0;
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os.rawder = NULL;
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os.rawpem = NULL;
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os.pk8der = NULL;
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os.pk8pem = NULL;
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num_files = 0;
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buf = NULL;
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pos = NULL;
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@ -294,9 +582,69 @@ do_skey(int argc, char *argv[])
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} else if (eqstr(arg, "-q") || eqstr(arg, "-quiet")) {
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verbose = 0;
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} else if (eqstr(arg, "-text")) {
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print_text = 1;
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os.print_text = 1;
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} else if (eqstr(arg, "-C")) {
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print_C = 1;
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os.print_C = 1;
|
||||
} else if (eqstr(arg, "-rawder")) {
|
||||
if (++ i >= argc) {
|
||||
fprintf(stderr,
|
||||
"ERROR: no argument for '-rawder'\n");
|
||||
usage_skey();
|
||||
goto skey_exit_error;
|
||||
}
|
||||
if (os.rawder != NULL) {
|
||||
fprintf(stderr,
|
||||
"ERROR: multiple '-rawder' options\n");
|
||||
usage_skey();
|
||||
goto skey_exit_error;
|
||||
}
|
||||
os.rawder = argv[i];
|
||||
argv[i] = NULL;
|
||||
} else if (eqstr(arg, "-rawpem")) {
|
||||
if (++ i >= argc) {
|
||||
fprintf(stderr,
|
||||
"ERROR: no argument for '-rawpem'\n");
|
||||
usage_skey();
|
||||
goto skey_exit_error;
|
||||
}
|
||||
if (os.rawpem != NULL) {
|
||||
fprintf(stderr,
|
||||
"ERROR: multiple '-rawpem' options\n");
|
||||
usage_skey();
|
||||
goto skey_exit_error;
|
||||
}
|
||||
os.rawpem = argv[i];
|
||||
argv[i] = NULL;
|
||||
} else if (eqstr(arg, "-pk8der")) {
|
||||
if (++ i >= argc) {
|
||||
fprintf(stderr,
|
||||
"ERROR: no argument for '-pk8der'\n");
|
||||
usage_skey();
|
||||
goto skey_exit_error;
|
||||
}
|
||||
if (os.pk8der != NULL) {
|
||||
fprintf(stderr,
|
||||
"ERROR: multiple '-pk8der' options\n");
|
||||
usage_skey();
|
||||
goto skey_exit_error;
|
||||
}
|
||||
os.pk8der = argv[i];
|
||||
argv[i] = NULL;
|
||||
} else if (eqstr(arg, "-pk8pem")) {
|
||||
if (++ i >= argc) {
|
||||
fprintf(stderr,
|
||||
"ERROR: no argument for '-pk8pem'\n");
|
||||
usage_skey();
|
||||
goto skey_exit_error;
|
||||
}
|
||||
if (os.pk8pem != NULL) {
|
||||
fprintf(stderr,
|
||||
"ERROR: multiple '-pk8pem' options\n");
|
||||
usage_skey();
|
||||
goto skey_exit_error;
|
||||
}
|
||||
os.pk8pem = argv[i];
|
||||
argv[i] = NULL;
|
||||
} else if (eqstr(arg, "-gen")) {
|
||||
if (++ i >= argc) {
|
||||
fprintf(stderr,
|
||||
|
|
@ -312,6 +660,9 @@ do_skey(int argc, char *argv[])
|
|||
}
|
||||
kgen_spec = argv[i];
|
||||
argv[i] = NULL;
|
||||
} else if (eqstr(arg, "-list")) {
|
||||
list_curves();
|
||||
goto skey_exit;
|
||||
} else {
|
||||
fprintf(stderr, "ERROR: unknown option: '%s'\n", arg);
|
||||
usage_skey();
|
||||
|
|
@ -321,6 +672,7 @@ do_skey(int argc, char *argv[])
|
|||
if (kgen_spec != NULL) {
|
||||
unsigned rsa_size;
|
||||
uint32_t rsa_pubexp;
|
||||
int curve;
|
||||
|
||||
if (num_files != 0) {
|
||||
fprintf(stderr,
|
||||
|
|
@ -330,7 +682,13 @@ do_skey(int argc, char *argv[])
|
|||
}
|
||||
|
||||
if (parse_rsa_spec(kgen_spec, &rsa_size, &rsa_pubexp)) {
|
||||
keygen_rsa(rsa_size, rsa_pubexp, print_text, print_C);
|
||||
if (!keygen_rsa(rsa_size, rsa_pubexp, &os)) {
|
||||
goto skey_exit_error;
|
||||
}
|
||||
} else if (parse_ec_spec(kgen_spec, &curve)) {
|
||||
if (!keygen_ec(curve, &os)) {
|
||||
goto skey_exit_error;
|
||||
}
|
||||
} else {
|
||||
fprintf(stderr,
|
||||
"ERROR: unknown key specification: '%s'\n",
|
||||
|
|
@ -360,7 +718,7 @@ do_skey(int argc, char *argv[])
|
|||
fprintf(stderr, "File '%s': ASN.1/DER object\n",
|
||||
fname);
|
||||
}
|
||||
if (decode_key(buf, len, print_text, print_C) < 0) {
|
||||
if (!decode_key(buf, len, &os)) {
|
||||
goto skey_exit_error;
|
||||
}
|
||||
} else {
|
||||
|
|
@ -382,9 +740,8 @@ do_skey(int argc, char *argv[])
|
|||
|| eqstr(name, "EC PRIVATE KEY")
|
||||
|| eqstr(name, "PRIVATE KEY"))
|
||||
{
|
||||
if (decode_key(pos[u].data,
|
||||
pos[u].data_len,
|
||||
print_text, print_C) < 0)
|
||||
if (!decode_key(pos[u].data,
|
||||
pos[u].data_len, &os))
|
||||
{
|
||||
goto skey_exit_error;
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue