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openssl/crypto/dsa/dsa_pmeth.c

Index: openssl/crypto/dsa/dsa_pmeth.c
===================================================================
--- openssl/crypto/dsa/dsa_pmeth.c	(revision 0)
+++ openssl/crypto/dsa/dsa_pmeth.c	(revision 0)
@@ -0,0 +1,316 @@
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project 2006.
+ */
+/* ====================================================================
+ * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
+ *
+ * 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 above 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 acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED 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 OpenSSL PROJECT OR
+ * ITS 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.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+
+#include <stdio.h>
+#include "cryptlib.h"
+#include <openssl/asn1t.h>
+#include <openssl/x509.h>
+#include <openssl/evp.h>
+#include <openssl/bn.h>
+#include "evp_locl.h"
+#include "dsa_locl.h"
+
+/* DSA pkey context structure */
+
+typedef struct
+	{
+	/* Parameter gen parameters */
+	int nbits;		/* size of p in bits (default: 1024) */
+	int qbits;		/* size of q in bits (default: 160)  */
+	const EVP_MD *pmd;	/* MD for parameter generation */
+	/* Keygen callback info */
+	int gentmp[2];
+	/* message digest */
+	const EVP_MD *md;	/* MD for the signature */
+	} DSA_PKEY_CTX;
+
+static int pkey_dsa_init(EVP_PKEY_CTX *ctx)
+	{
+	DSA_PKEY_CTX *dctx;
+	dctx = OPENSSL_malloc(sizeof(DSA_PKEY_CTX));
+	if (!dctx)
+		return 0;
+	dctx->nbits = 1024;
+	dctx->qbits = 160;
+	dctx->pmd = NULL;
+	dctx->md = NULL;
+
+	ctx->data = dctx;
+	ctx->keygen_info = dctx->gentmp;
+	ctx->keygen_info_count = 2;
+	
+	return 1;
+	}
+
+static int pkey_dsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
+	{
+	DSA_PKEY_CTX *dctx, *sctx;
+	if (!pkey_dsa_init(dst))
+		return 0;
+       	sctx = src->data;
+	dctx = dst->data;
+	dctx->nbits = sctx->nbits;
+	dctx->qbits = sctx->qbits;
+	dctx->pmd = sctx->pmd;
+	dctx->md  = sctx->md;
+	return 1;
+	}
+
+static void pkey_dsa_cleanup(EVP_PKEY_CTX *ctx)
+	{
+	DSA_PKEY_CTX *dctx = ctx->data;
+	if (dctx)
+		OPENSSL_free(dctx);
+	}
+
+static int pkey_dsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
+					const unsigned char *tbs, size_t tbslen)
+	{
+	int ret, type;
+	unsigned int sltmp;
+	DSA_PKEY_CTX *dctx = ctx->data;
+	DSA *dsa = ctx->pkey->pkey.dsa;
+
+	if (dctx->md)
+		type = EVP_MD_type(dctx->md);
+	else
+		type = NID_sha1;
+
+	ret = DSA_sign(type, tbs, tbslen, sig, &sltmp, dsa);
+
+	if (ret <= 0)
+		return ret;
+	*siglen = sltmp;
+	return 1;
+	}
+
+static int pkey_dsa_verify(EVP_PKEY_CTX *ctx,
+					const unsigned char *sig, size_t siglen,
+					const unsigned char *tbs, size_t tbslen)
+	{
+	int ret, type;
+	DSA_PKEY_CTX *dctx = ctx->data;
+	DSA *dsa = ctx->pkey->pkey.dsa;
+
+	if (dctx->md)
+		type = EVP_MD_type(dctx->md);
+	else
+		type = NID_sha1;
+
+	ret = DSA_verify(type, tbs, tbslen, sig, siglen, dsa);
+
+	return ret;
+	}
+
+static int pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
+	{
+	DSA_PKEY_CTX *dctx = ctx->data;
+	switch (type)
+		{
+		case EVP_PKEY_CTRL_DSA_PARAMGEN_BITS:
+		if (p1 < 256)
+			return -2;
+		dctx->nbits = p1;
+		return 1;
+
+		case EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS:
+		if (p1 != 160 && p1 != 224 && p1 && p1 != 256)
+			return -2;
+		dctx->qbits = p1;
+		return 1;
+
+		case EVP_PKEY_CTRL_DSA_PARAMGEN_MD:
+		if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1   &&
+		    EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
+		    EVP_MD_type((const EVP_MD *)p2) != NID_sha256)
+			{
+			DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
+			return 0;
+			}
+		dctx->md = p2;
+		return 1;
+
+		case EVP_PKEY_CTRL_MD:
+		if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1   &&
+		    EVP_MD_type((const EVP_MD *)p2) != NID_dsa    &&
+		    EVP_MD_type((const EVP_MD *)p2) != NID_dsaWithSHA    &&
+		    EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
+		    EVP_MD_type((const EVP_MD *)p2) != NID_sha256)
+			{
+			DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
+			return 0;
+			}
+		dctx->md = p2;
+		return 1;
+
+		case EVP_PKEY_CTRL_DIGESTINIT:
+		case EVP_PKEY_CTRL_PKCS7_SIGN:
+		case EVP_PKEY_CTRL_CMS_SIGN:
+		return 1;
+		
+		case EVP_PKEY_CTRL_PEER_KEY:
+			DSAerr(DSA_F_PKEY_DSA_CTRL,
+			EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
+			return -2;	
+		default:
+		return -2;
+
+		}
+	}
+			
+static int pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx,
+			const char *type, const char *value)
+	{
+	if (!strcmp(type, "dsa_paramgen_bits"))
+		{
+		int nbits;
+		nbits = atoi(value);
+		return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits);
+		}
+	if (!strcmp(type, "dsa_paramgen_q_bits"))
+		{
+		int qbits = atoi(value);
+		return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
+		                         EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS, qbits, NULL);
+		}
+	if (!strcmp(type, "dsa_paramgen_md"))
+		{
+		return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
+		                         EVP_PKEY_CTRL_DSA_PARAMGEN_MD, 0, 
+		                         (void *)EVP_get_digestbyname(value));
+		}
+	return -2;
+	}
+
+static int pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
+	{
+	DSA *dsa = NULL;
+	DSA_PKEY_CTX *dctx = ctx->data;
+	BN_GENCB *pcb, cb;
+	int ret;
+	if (ctx->pkey_gencb)
+		{
+		pcb = &cb;
+		evp_pkey_set_cb_translate(pcb, ctx);
+		}
+	else
+		pcb = NULL;
+	dsa = DSA_new();
+	if (!dsa)
+		return 0;
+	ret = dsa_builtin_paramgen(dsa, dctx->nbits, dctx->qbits, dctx->pmd,
+	                           NULL, 0, NULL, NULL, pcb);
+	if (ret)
+		EVP_PKEY_assign_DSA(pkey, dsa);
+	else
+		DSA_free(dsa);
+	return ret;
+	}
+
+static int pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
+	{
+	DSA *dsa = NULL;
+	if (ctx->pkey == NULL)
+		{
+		DSAerr(DSA_F_PKEY_DSA_KEYGEN, DSA_R_NO_PARAMETERS_SET);
+		return 0;
+		}
+	dsa = DSA_new();
+	if (!dsa)
+		return 0;
+	EVP_PKEY_assign_DSA(pkey, dsa);
+	/* Note: if error return, pkey is freed by parent routine */
+	if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
+		return 0;
+	return DSA_generate_key(pkey->pkey.dsa);
+	}
+
+const EVP_PKEY_METHOD dsa_pkey_meth = 
+	{
+	EVP_PKEY_DSA,
+	EVP_PKEY_FLAG_AUTOARGLEN,
+	pkey_dsa_init,
+	pkey_dsa_copy,
+	pkey_dsa_cleanup,
+
+	0,
+	pkey_dsa_paramgen,
+
+	0,
+	pkey_dsa_keygen,
+
+	0,
+	pkey_dsa_sign,
+
+	0,
+	pkey_dsa_verify,
+
+	0,0,
+
+	0,0,0,0,
+
+	0,0,
+
+	0,0,
+
+	0,0,
+
+	pkey_dsa_ctrl,
+	pkey_dsa_ctrl_str
+
+
+	};