1 files changed, 152 insertions, 0 deletions

diff --git a/src/lib/libcrypto/dsa/dsa_vrf.c b/src/lib/libcrypto/dsa/dsa_vrf.c
new file mode 100644
index 0000000000..0f860984ed
--- /dev/null
+++ b/src/lib/libcrypto/dsa/dsa_vrf.c
@@ -0,0 +1,152 @@
+/* crypto/dsa/dsa_vrf.c */
+/* 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.]
+ */
+
+/* Origional version from Steven Schoch <schoch@sheba.arc.nasa.gov> */
+
+#include <stdio.h>
+#include "cryptlib.h"
+#include "bn.h"
+#include "dsa.h"
+#include "rand.h"
+#include "asn1.h"
+#include "asn1_mac.h"
+
+/* data has already been hashed (probably with SHA or SHA-1). */
+/* returns
+ *       1: correct signature
+ *       0: incorrect signature
+ *      -1: error
+ */
+int DSA_verify(type,dgst,dgst_len,sigbuf,siglen, dsa)
+int type;
+unsigned char *dgst;
+int dgst_len;
+unsigned char *sigbuf;
+int siglen;
+DSA *dsa;
+        {
+        /* The next 3 are used by the M_ASN1 macros */
+        long length=siglen;
+        ASN1_CTX c;
+        unsigned char **pp= &sigbuf;
+        BN_CTX *ctx;
+        BIGNUM *r=NULL;
+        BIGNUM *t1=NULL,*t2=NULL;
+        BIGNUM *u1=NULL,*u2=NULL;
+        ASN1_INTEGER *bs=NULL;
+        int ret = -1;
+
+        ctx=BN_CTX_new();
+        if (ctx == NULL) goto err;
+
+        t1=BN_new();
+        t2=BN_new();
+        if (t1 == NULL || t2 == NULL) goto err;
+
+        M_ASN1_D2I_Init();
+        M_ASN1_D2I_start_sequence();
+        M_ASN1_D2I_get(bs,d2i_ASN1_INTEGER);
+        if ((r=BN_bin2bn(bs->data,bs->length,NULL)) == NULL) goto err_bn;
+        M_ASN1_D2I_get(bs,d2i_ASN1_INTEGER);
+        if ((u1=BN_bin2bn(bs->data,bs->length,NULL)) == NULL) goto err_bn;
+        if (!asn1_Finish(&c)) goto err;
+
+        /* Calculate W = inv(S) mod Q
+         * save W in u2 */
+        if ((u2=BN_mod_inverse(u1,dsa->q,ctx)) == NULL) goto err_bn;
+
+        /* save M in u1 */
+        if (BN_bin2bn(dgst,dgst_len,u1) == NULL) goto err_bn;
+
+        /* u1 = M * w mod q */
+        if (!BN_mod_mul(u1,u1,u2,dsa->q,ctx)) goto err_bn;
+
+        /* u2 = r * w mod q */
+        if (!BN_mod_mul(u2,r,u2,dsa->q,ctx)) goto err_bn;
+
+        /* v = ( g^u1 * y^u2 mod p ) mod q */
+        /* let t1 = g ^ u1 mod p */
+        if (!BN_mod_exp(t1,dsa->g,u1,dsa->p,ctx)) goto err_bn;
+        /* let t2 = y ^ u2 mod p */
+        if (!BN_mod_exp(t2,dsa->pub_key,u2,dsa->p,ctx)) goto err_bn;
+        /* let u1 = t1 * t2 mod p */
+        if (!BN_mod_mul(u1,t1,t2,dsa->p,ctx)) goto err_bn;
+        /* let u1 = u1 mod q */
+        if (!BN_mod(u1,u1,dsa->q,ctx)) goto err_bn;
+        /* V is now in u1.  If the signature is correct, it will be
+         * equal to R. */
+        ret=(BN_ucmp(u1, r) == 0);
+        if (0)
+                {
+err: /* ASN1 error */
+                DSAerr(DSA_F_DSA_VERIFY,c.error);
+                }
+        if (0)
+                {
+err_bn: /* BN error */
+                DSAerr(DSA_F_DSA_VERIFY,ERR_R_BN_LIB);
+                }
+        if (ctx != NULL) BN_CTX_free(ctx);
+        if (r != NULL) BN_free(r);
+        if (t1 != NULL) BN_free(t1);
+        if (t2 != NULL) BN_free(t2);
+        if (u1 != NULL) BN_free(u1);
+        if (u2 != NULL) BN_free(u2);
+        if (bs != NULL) ASN1_BIT_STRING_free(bs);
+        return(ret);
+        }