1 files changed, 354 insertions, 0 deletions

diff --git a/src/crypto/dsa/dsa.c b/src/crypto/dsa/dsa.c
new file mode 100644
index 0000000..8816b63
--- /dev/null
+++ b/src/crypto/dsa/dsa.c
@@ -0,0 +1,354 @@
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ *
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to.  The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ *
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *    "This product includes cryptographic software written by
+ *     Eric Young (eay@cryptsoft.com)"
+ *    The word 'cryptographic' can be left out if the rouines from the library
+ *    being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from
+ *    the apps directory (application code) you must include an acknowledgement:
+ *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed.  i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.]
+ *
+ * The DSS routines are based on patches supplied by
+ * Steven Schoch <schoch@sheba.arc.nasa.gov>. */
+
+#include <openssl/dsa.h>
+
+#include <string.h>
+
+#include <openssl/asn1.h>
+#include <openssl/dh.h>
+#include <openssl/engine.h>
+#include <openssl/err.h>
+#include <openssl/ex_data.h>
+#include <openssl/mem.h>
+
+#include "internal.h"
+
+
+extern const DSA_METHOD DSA_default_method;
+
+DSA *DSA_new(void) { return DSA_new_method(NULL); }
+
+DSA *DSA_new_method(const ENGINE *engine) {
+  DSA *dsa = (DSA *)OPENSSL_malloc(sizeof(DSA));
+  if (dsa == NULL) {
+    OPENSSL_PUT_ERROR(DSA, DSA_new_method, ERR_R_MALLOC_FAILURE);
+    return NULL;
+  }
+
+  memset(dsa, 0, sizeof(DSA));
+
+  if (engine) {
+    dsa->meth = ENGINE_get_DSA_method(engine);
+  }
+
+  if (dsa->meth == NULL) {
+    dsa->meth = (DSA_METHOD*) &DSA_default_method;
+  }
+  METHOD_ref(dsa->meth);
+
+  dsa->write_params = 1;
+  dsa->references = 1;
+
+  if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, dsa, &dsa->ex_data)) {
+    METHOD_unref(dsa->meth);
+    OPENSSL_free(dsa);
+    return NULL;
+  }
+
+  if (dsa->meth->init && !dsa->meth->init(dsa)) {
+    CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, dsa, &dsa->ex_data);
+    METHOD_unref(dsa->meth);
+    OPENSSL_free(dsa);
+    return NULL;
+  }
+
+  return dsa;
+}
+
+void DSA_free(DSA *dsa) {
+  if (dsa == NULL) {
+    return;
+  }
+
+  if (CRYPTO_add(&dsa->references, -1, CRYPTO_LOCK_DSA) > 0) {
+    return;
+  }
+
+  if (dsa->meth->finish) {
+    dsa->meth->finish(dsa);
+  }
+  METHOD_unref(dsa->meth);
+
+  CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, dsa, &dsa->ex_data);
+
+  if (dsa->p != NULL)
+    BN_clear_free(dsa->p);
+  if (dsa->q != NULL)
+    BN_clear_free(dsa->q);
+  if (dsa->g != NULL)
+    BN_clear_free(dsa->g);
+  if (dsa->pub_key != NULL)
+    BN_clear_free(dsa->pub_key);
+  if (dsa->priv_key != NULL)
+    BN_clear_free(dsa->priv_key);
+  if (dsa->kinv != NULL)
+    BN_clear_free(dsa->kinv);
+  if (dsa->r != NULL)
+    BN_clear_free(dsa->r);
+  OPENSSL_free(dsa);
+}
+
+int DSA_up_ref(DSA *dsa) {
+  CRYPTO_add(&dsa->references, 1, CRYPTO_LOCK_DSA);
+  return 1;
+}
+
+int DSA_generate_parameters_ex(DSA *dsa, unsigned bits, const uint8_t *seed_in,
+                               size_t seed_len, int *out_counter,
+                               unsigned long *out_h, BN_GENCB *cb) {
+  if (dsa->meth->generate_parameters) {
+    return dsa->meth->generate_parameters(dsa, bits, seed_in, seed_len,
+                                          out_counter, out_h, cb);
+  }
+  return DSA_default_method.generate_parameters(dsa, bits, seed_in, seed_len,
+                                                out_counter, out_h, cb);
+}
+
+int DSA_generate_key(DSA *dsa) {
+  if (dsa->meth->keygen) {
+    return dsa->meth->keygen(dsa);
+  }
+  return DSA_default_method.keygen(dsa);
+}
+
+DSA_SIG *DSA_SIG_new(void) {
+  DSA_SIG *sig;
+  sig = OPENSSL_malloc(sizeof(DSA_SIG));
+  if (!sig) {
+    return NULL;
+  }
+  sig->r = NULL;
+  sig->s = NULL;
+  return sig;
+}
+
+void DSA_SIG_free(DSA_SIG *sig) {
+  if (!sig) {
+    return;
+  }
+
+  if (sig->r) {
+    BN_free(sig->r);
+  }
+  if (sig->s) {
+    BN_free(sig->s);
+  }
+  OPENSSL_free(sig);
+}
+
+DSA_SIG *DSA_do_sign(const uint8_t *digest, size_t digest_len, DSA *dsa) {
+  if (dsa->meth->sign) {
+    return dsa->meth->sign(digest, digest_len, dsa);
+  }
+  return DSA_default_method.sign(digest, digest_len, dsa);
+}
+
+int DSA_do_verify(const uint8_t *digest, size_t digest_len, DSA_SIG *sig,
+                  const DSA *dsa) {
+  int valid;
+  if (!DSA_do_check_signature(&valid, digest, digest_len, sig, dsa)) {
+    return -1;
+  }
+  return valid;
+}
+
+int DSA_do_check_signature(int *out_valid, const uint8_t *digest,
+                           size_t digest_len, DSA_SIG *sig, const DSA *dsa) {
+  if (dsa->meth->verify) {
+    return dsa->meth->verify(out_valid, digest, digest_len, sig, dsa);
+  }
+
+  return DSA_default_method.verify(out_valid, digest, digest_len, sig, dsa);
+}
+
+int DSA_sign(int type, const uint8_t *digest, size_t digest_len,
+             uint8_t *out_sig, unsigned int *out_siglen, DSA *dsa) {
+  DSA_SIG *s;
+
+  s = DSA_do_sign(digest, digest_len, dsa);
+  if (s == NULL) {
+    *out_siglen = 0;
+    return 0;
+  }
+
+  *out_siglen = i2d_DSA_SIG(s, &out_sig);
+  DSA_SIG_free(s);
+  return 1;
+}
+
+int DSA_verify(int type, const uint8_t *digest, size_t digest_len,
+               const uint8_t *sig, size_t sig_len, const DSA *dsa) {
+  int valid;
+  if (!DSA_check_signature(&valid, digest, digest_len, sig, sig_len, dsa)) {
+    return -1;
+  }
+  return valid;
+}
+
+int DSA_check_signature(int *out_valid, const uint8_t *digest,
+                        size_t digest_len, const uint8_t *sig, size_t sig_len,
+                        const DSA *dsa) {
+  DSA_SIG *s = NULL;
+  int ret = 0;
+  uint8_t *der = NULL;
+
+  s = DSA_SIG_new();
+  if (s == NULL) {
+    goto err;
+  }
+
+  const uint8_t *sigp = sig;
+  if (d2i_DSA_SIG(&s, &sigp, sig_len) == NULL || sigp != sig + sig_len) {
+    goto err;
+  }
+
+  /* Ensure that the signature uses DER and doesn't have trailing garbage. */
+  int der_len = i2d_DSA_SIG(s, &der);
+  if (der_len < 0 || (size_t)der_len != sig_len || memcmp(sig, der, sig_len)) {
+    goto err;
+  }
+
+  ret = DSA_do_check_signature(out_valid, digest, digest_len, s, dsa);
+
+err:
+  if (der != NULL) {
+    OPENSSL_free(der);
+  }
+  if (s) {
+    DSA_SIG_free(s);
+  }
+  return ret;
+}
+
+int DSA_size(const DSA *dsa) {
+  int ret, i;
+  ASN1_INTEGER bs;
+  unsigned char buf[4]; /* 4 bytes looks really small.
+                           However, i2d_ASN1_INTEGER() will not look
+                           beyond the first byte, as long as the second
+                           parameter is NULL. */
+
+  i = BN_num_bits(dsa->q);
+  bs.length = (i + 7) / 8;
+  bs.data = buf;
+  bs.type = V_ASN1_INTEGER;
+  /* If the top bit is set the asn1 encoding is 1 larger. */
+  buf[0] = 0xff;
+
+  i = i2d_ASN1_INTEGER(&bs, NULL);
+  i += i; /* r and s */
+  ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);
+  return ret;
+}
+
+int DSA_sign_setup(const DSA *dsa, BN_CTX *ctx, BIGNUM **out_kinv,
+                   BIGNUM **out_r) {
+  if (dsa->meth->sign_setup) {
+    return dsa->meth->sign_setup(dsa, ctx, out_kinv, out_r, NULL, 0);
+  }
+
+  return DSA_default_method.sign_setup(dsa, ctx, out_kinv, out_r, NULL, 0);
+}
+
+int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
+                         CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) {
+  return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp, new_func,
+                                 dup_func, free_func);
+}
+
+int DSA_set_ex_data(DSA *d, int idx, void *arg) {
+  return CRYPTO_set_ex_data(&d->ex_data, idx, arg);
+}
+
+void *DSA_get_ex_data(const DSA *d, int idx) {
+  return CRYPTO_get_ex_data(&d->ex_data, idx);
+}
+
+DH *DSA_dup_DH(const DSA *r) {
+  DH *ret = NULL;
+
+  if (r == NULL) {
+    goto err;
+  }
+  ret = DH_new();
+  if (ret == NULL) {
+    goto err;
+  }
+  if (r->q != NULL) {
+    ret->priv_length = BN_num_bits(r->q);
+    if ((ret->q = BN_dup(r->q)) == NULL) {
+      goto err;
+    }
+  }
+  if ((r->p != NULL && (ret->p = BN_dup(r->p)) == NULL) ||
+      (r->g != NULL && (ret->g = BN_dup(r->g)) == NULL) ||
+      (r->pub_key != NULL && (ret->pub_key = BN_dup(r->pub_key)) == NULL) ||
+      (r->priv_key != NULL && (ret->priv_key = BN_dup(r->priv_key)) == NULL)) {
+      goto err;
+  }
+
+  return ret;
+
+err:
+  if (ret != NULL) {
+    DH_free(ret);
+  }
+  return NULL;
+}