317 lines
8 KiB
C
317 lines
8 KiB
C
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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* project 2006.
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*/
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/* ====================================================================
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* Copyright (c) 2006 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <stdio.h>
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#include "cryptlib.h"
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#include <openssl/asn1t.h>
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#include <openssl/x509.h>
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#include <openssl/evp.h>
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#include <openssl/bn.h>
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#include "evp_locl.h"
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#include "dsa_locl.h"
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/* DSA pkey context structure */
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typedef struct
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{
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/* Parameter gen parameters */
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int nbits; /* size of p in bits (default: 1024) */
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int qbits; /* size of q in bits (default: 160) */
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const EVP_MD *pmd; /* MD for parameter generation */
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/* Keygen callback info */
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int gentmp[2];
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/* message digest */
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const EVP_MD *md; /* MD for the signature */
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} DSA_PKEY_CTX;
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static int pkey_dsa_init(EVP_PKEY_CTX *ctx)
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{
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DSA_PKEY_CTX *dctx;
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dctx = OPENSSL_malloc(sizeof(DSA_PKEY_CTX));
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if (!dctx)
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return 0;
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dctx->nbits = 1024;
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dctx->qbits = 160;
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dctx->pmd = NULL;
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dctx->md = NULL;
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ctx->data = dctx;
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ctx->keygen_info = dctx->gentmp;
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ctx->keygen_info_count = 2;
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return 1;
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}
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static int pkey_dsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
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{
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DSA_PKEY_CTX *dctx, *sctx;
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if (!pkey_dsa_init(dst))
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return 0;
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sctx = src->data;
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dctx = dst->data;
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dctx->nbits = sctx->nbits;
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dctx->qbits = sctx->qbits;
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dctx->pmd = sctx->pmd;
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dctx->md = sctx->md;
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return 1;
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}
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static void pkey_dsa_cleanup(EVP_PKEY_CTX *ctx)
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{
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DSA_PKEY_CTX *dctx = ctx->data;
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if (dctx)
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OPENSSL_free(dctx);
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}
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static int pkey_dsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
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const unsigned char *tbs, size_t tbslen)
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{
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int ret, type;
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unsigned int sltmp;
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DSA_PKEY_CTX *dctx = ctx->data;
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DSA *dsa = ctx->pkey->pkey.dsa;
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if (dctx->md)
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type = EVP_MD_type(dctx->md);
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else
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type = NID_sha1;
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ret = DSA_sign(type, tbs, tbslen, sig, &sltmp, dsa);
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if (ret <= 0)
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return ret;
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*siglen = sltmp;
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return 1;
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}
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static int pkey_dsa_verify(EVP_PKEY_CTX *ctx,
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const unsigned char *sig, size_t siglen,
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const unsigned char *tbs, size_t tbslen)
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{
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int ret, type;
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DSA_PKEY_CTX *dctx = ctx->data;
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DSA *dsa = ctx->pkey->pkey.dsa;
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if (dctx->md)
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type = EVP_MD_type(dctx->md);
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else
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type = NID_sha1;
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ret = DSA_verify(type, tbs, tbslen, sig, siglen, dsa);
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return ret;
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}
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static int pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
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{
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DSA_PKEY_CTX *dctx = ctx->data;
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switch (type)
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{
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case EVP_PKEY_CTRL_DSA_PARAMGEN_BITS:
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if (p1 < 256)
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return -2;
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dctx->nbits = p1;
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return 1;
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case EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS:
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if (p1 != 160 && p1 != 224 && p1 && p1 != 256)
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return -2;
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dctx->qbits = p1;
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return 1;
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case EVP_PKEY_CTRL_DSA_PARAMGEN_MD:
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if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
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EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
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EVP_MD_type((const EVP_MD *)p2) != NID_sha256)
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{
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DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
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return 0;
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}
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dctx->md = p2;
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return 1;
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case EVP_PKEY_CTRL_MD:
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if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
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EVP_MD_type((const EVP_MD *)p2) != NID_dsa &&
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EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
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EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
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EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
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EVP_MD_type((const EVP_MD *)p2) != NID_sha512)
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{
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DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
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return 0;
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}
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dctx->md = p2;
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return 1;
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case EVP_PKEY_CTRL_DIGESTINIT:
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case EVP_PKEY_CTRL_PKCS7_SIGN:
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case EVP_PKEY_CTRL_CMS_SIGN:
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return 1;
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case EVP_PKEY_CTRL_PEER_KEY:
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DSAerr(DSA_F_PKEY_DSA_CTRL,
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EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
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return -2;
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default:
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return -2;
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}
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}
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static int pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx,
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const char *type, const char *value)
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{
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if (!strcmp(type, "dsa_paramgen_bits"))
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{
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int nbits;
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nbits = atoi(value);
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return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits);
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}
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if (!strcmp(type, "dsa_paramgen_q_bits"))
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{
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int qbits = atoi(value);
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return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
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EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS, qbits, NULL);
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}
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if (!strcmp(type, "dsa_paramgen_md"))
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{
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return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
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EVP_PKEY_CTRL_DSA_PARAMGEN_MD, 0,
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(void *)EVP_get_digestbyname(value));
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}
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return -2;
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}
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static int pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
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{
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DSA *dsa = NULL;
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DSA_PKEY_CTX *dctx = ctx->data;
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BN_GENCB *pcb, cb;
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int ret;
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if (ctx->pkey_gencb)
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{
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pcb = &cb;
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evp_pkey_set_cb_translate(pcb, ctx);
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}
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else
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pcb = NULL;
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dsa = DSA_new();
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if (!dsa)
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return 0;
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ret = dsa_builtin_paramgen(dsa, dctx->nbits, dctx->qbits, dctx->pmd,
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NULL, 0, NULL, NULL, NULL, pcb);
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if (ret)
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EVP_PKEY_assign_DSA(pkey, dsa);
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else
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DSA_free(dsa);
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return ret;
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}
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static int pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
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{
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DSA *dsa = NULL;
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if (ctx->pkey == NULL)
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{
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DSAerr(DSA_F_PKEY_DSA_KEYGEN, DSA_R_NO_PARAMETERS_SET);
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return 0;
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}
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dsa = DSA_new();
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if (!dsa)
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return 0;
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EVP_PKEY_assign_DSA(pkey, dsa);
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/* Note: if error return, pkey is freed by parent routine */
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if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
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return 0;
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return DSA_generate_key(pkey->pkey.dsa);
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}
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const EVP_PKEY_METHOD dsa_pkey_meth =
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{
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EVP_PKEY_DSA,
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EVP_PKEY_FLAG_AUTOARGLEN,
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pkey_dsa_init,
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pkey_dsa_copy,
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pkey_dsa_cleanup,
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0,
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pkey_dsa_paramgen,
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0,
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pkey_dsa_keygen,
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0,
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pkey_dsa_sign,
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0,
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pkey_dsa_verify,
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0,0,
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0,0,0,0,
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0,0,
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0,0,
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0,0,
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pkey_dsa_ctrl,
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pkey_dsa_ctrl_str
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};
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