[331] | 1 | /*
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| 2 | * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 | #include <openssl/asn1t.h>
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| 13 | #include <openssl/x509.h>
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| 14 | #include <openssl/evp.h>
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| 15 | #include <openssl/bn.h>
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| 16 | #include "internal/evp_int.h"
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| 17 | #include "dsa_locl.h"
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| 18 |
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| 19 | /* DSA pkey context structure */
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| 20 |
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| 21 | typedef struct {
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| 22 | /* Parameter gen parameters */
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| 23 | int nbits; /* size of p in bits (default: 1024) */
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| 24 | int qbits; /* size of q in bits (default: 160) */
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| 25 | const EVP_MD *pmd; /* MD for parameter generation */
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| 26 | /* Keygen callback info */
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| 27 | int gentmp[2];
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| 28 | /* message digest */
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| 29 | const EVP_MD *md; /* MD for the signature */
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| 30 | } DSA_PKEY_CTX;
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| 31 |
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| 32 | static int pkey_dsa_init(EVP_PKEY_CTX *ctx)
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| 33 | {
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| 34 | DSA_PKEY_CTX *dctx;
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| 35 | dctx = OPENSSL_malloc(sizeof(*dctx));
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| 36 | if (dctx == NULL)
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| 37 | return 0;
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| 38 | dctx->nbits = 1024;
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| 39 | dctx->qbits = 160;
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| 40 | dctx->pmd = NULL;
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| 41 | dctx->md = NULL;
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| 42 |
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| 43 | ctx->data = dctx;
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| 44 | ctx->keygen_info = dctx->gentmp;
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| 45 | ctx->keygen_info_count = 2;
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| 46 |
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| 47 | return 1;
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| 48 | }
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| 49 |
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| 50 | static int pkey_dsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
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| 51 | {
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| 52 | DSA_PKEY_CTX *dctx, *sctx;
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| 53 | if (!pkey_dsa_init(dst))
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| 54 | return 0;
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| 55 | sctx = src->data;
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| 56 | dctx = dst->data;
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| 57 | dctx->nbits = sctx->nbits;
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| 58 | dctx->qbits = sctx->qbits;
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| 59 | dctx->pmd = sctx->pmd;
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| 60 | dctx->md = sctx->md;
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| 61 | return 1;
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| 62 | }
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| 63 |
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| 64 | static void pkey_dsa_cleanup(EVP_PKEY_CTX *ctx)
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| 65 | {
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| 66 | DSA_PKEY_CTX *dctx = ctx->data;
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| 67 | OPENSSL_free(dctx);
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| 68 | }
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| 69 |
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| 70 | static int pkey_dsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
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| 71 | size_t *siglen, const unsigned char *tbs,
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| 72 | size_t tbslen)
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| 73 | {
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| 74 | int ret;
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| 75 | unsigned int sltmp;
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| 76 | DSA_PKEY_CTX *dctx = ctx->data;
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| 77 | DSA *dsa = ctx->pkey->pkey.dsa;
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| 78 |
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| 79 | if (dctx->md) {
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| 80 | if (tbslen != (size_t)EVP_MD_size(dctx->md))
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| 81 | return 0;
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| 82 | } else {
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| 83 | if (tbslen != SHA_DIGEST_LENGTH)
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| 84 | return 0;
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| 85 | }
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| 86 |
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| 87 | ret = DSA_sign(0, tbs, tbslen, sig, &sltmp, dsa);
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| 88 |
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| 89 | if (ret <= 0)
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| 90 | return ret;
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| 91 | *siglen = sltmp;
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| 92 | return 1;
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| 93 | }
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| 94 |
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| 95 | static int pkey_dsa_verify(EVP_PKEY_CTX *ctx,
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| 96 | const unsigned char *sig, size_t siglen,
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| 97 | const unsigned char *tbs, size_t tbslen)
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| 98 | {
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| 99 | int ret;
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| 100 | DSA_PKEY_CTX *dctx = ctx->data;
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| 101 | DSA *dsa = ctx->pkey->pkey.dsa;
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| 102 |
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| 103 | if (dctx->md) {
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| 104 | if (tbslen != (size_t)EVP_MD_size(dctx->md))
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| 105 | return 0;
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| 106 | } else {
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| 107 | if (tbslen != SHA_DIGEST_LENGTH)
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| 108 | return 0;
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| 109 | }
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| 110 |
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| 111 | ret = DSA_verify(0, tbs, tbslen, sig, siglen, dsa);
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| 112 |
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| 113 | return ret;
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| 114 | }
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| 115 |
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| 116 | static int pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
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| 117 | {
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| 118 | DSA_PKEY_CTX *dctx = ctx->data;
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| 119 | switch (type) {
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| 120 | case EVP_PKEY_CTRL_DSA_PARAMGEN_BITS:
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| 121 | if (p1 < 256)
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| 122 | return -2;
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| 123 | dctx->nbits = p1;
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| 124 | return 1;
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| 125 |
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| 126 | case EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS:
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| 127 | if (p1 != 160 && p1 != 224 && p1 && p1 != 256)
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| 128 | return -2;
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| 129 | dctx->qbits = p1;
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| 130 | return 1;
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| 131 |
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| 132 | case EVP_PKEY_CTRL_DSA_PARAMGEN_MD:
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| 133 | if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
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| 134 | EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
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| 135 | EVP_MD_type((const EVP_MD *)p2) != NID_sha256) {
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| 136 | DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
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| 137 | return 0;
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| 138 | }
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| 139 | dctx->pmd = p2;
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| 140 | return 1;
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| 141 |
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| 142 | case EVP_PKEY_CTRL_MD:
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| 143 | if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
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| 144 | EVP_MD_type((const EVP_MD *)p2) != NID_dsa &&
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| 145 | EVP_MD_type((const EVP_MD *)p2) != NID_dsaWithSHA &&
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| 146 | EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
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| 147 | EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
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| 148 | EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
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| 149 | EVP_MD_type((const EVP_MD *)p2) != NID_sha512) {
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| 150 | DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
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| 151 | return 0;
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| 152 | }
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| 153 | dctx->md = p2;
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| 154 | return 1;
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| 155 |
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| 156 | case EVP_PKEY_CTRL_GET_MD:
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| 157 | *(const EVP_MD **)p2 = dctx->md;
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| 158 | return 1;
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| 159 |
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| 160 | case EVP_PKEY_CTRL_DIGESTINIT:
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| 161 | case EVP_PKEY_CTRL_PKCS7_SIGN:
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| 162 | case EVP_PKEY_CTRL_CMS_SIGN:
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| 163 | return 1;
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| 164 |
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| 165 | case EVP_PKEY_CTRL_PEER_KEY:
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| 166 | DSAerr(DSA_F_PKEY_DSA_CTRL,
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| 167 | EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
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| 168 | return -2;
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| 169 | default:
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| 170 | return -2;
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| 171 |
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| 172 | }
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| 173 | }
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| 174 |
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| 175 | static int pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx,
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| 176 | const char *type, const char *value)
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| 177 | {
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| 178 | if (strcmp(type, "dsa_paramgen_bits") == 0) {
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| 179 | int nbits;
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| 180 | nbits = atoi(value);
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| 181 | return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits);
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| 182 | }
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| 183 | if (strcmp(type, "dsa_paramgen_q_bits") == 0) {
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| 184 | int qbits = atoi(value);
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| 185 | return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
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| 186 | EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS, qbits,
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| 187 | NULL);
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| 188 | }
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| 189 | if (strcmp(type, "dsa_paramgen_md") == 0) {
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| 190 | return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
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| 191 | EVP_PKEY_CTRL_DSA_PARAMGEN_MD, 0,
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| 192 | (void *)EVP_get_digestbyname(value));
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| 193 | }
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| 194 | return -2;
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| 195 | }
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| 196 |
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| 197 | static int pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
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| 198 | {
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| 199 | DSA *dsa = NULL;
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| 200 | DSA_PKEY_CTX *dctx = ctx->data;
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| 201 | BN_GENCB *pcb;
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| 202 | int ret;
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| 203 | if (ctx->pkey_gencb) {
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| 204 | pcb = BN_GENCB_new();
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| 205 | if (pcb == NULL)
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| 206 | return 0;
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| 207 | evp_pkey_set_cb_translate(pcb, ctx);
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| 208 | } else
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| 209 | pcb = NULL;
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| 210 | dsa = DSA_new();
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| 211 | if (dsa == NULL) {
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| 212 | BN_GENCB_free(pcb);
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| 213 | return 0;
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| 214 | }
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| 215 | ret = dsa_builtin_paramgen(dsa, dctx->nbits, dctx->qbits, dctx->pmd,
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| 216 | NULL, 0, NULL, NULL, NULL, pcb);
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| 217 | BN_GENCB_free(pcb);
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| 218 | if (ret)
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| 219 | EVP_PKEY_assign_DSA(pkey, dsa);
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| 220 | else
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| 221 | DSA_free(dsa);
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| 222 | return ret;
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| 223 | }
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| 224 |
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| 225 | static int pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
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| 226 | {
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| 227 | DSA *dsa = NULL;
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| 228 | if (ctx->pkey == NULL) {
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| 229 | DSAerr(DSA_F_PKEY_DSA_KEYGEN, DSA_R_NO_PARAMETERS_SET);
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| 230 | return 0;
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| 231 | }
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| 232 | dsa = DSA_new();
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| 233 | if (dsa == NULL)
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| 234 | return 0;
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| 235 | EVP_PKEY_assign_DSA(pkey, dsa);
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| 236 | /* Note: if error return, pkey is freed by parent routine */
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| 237 | if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
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| 238 | return 0;
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| 239 | return DSA_generate_key(pkey->pkey.dsa);
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| 240 | }
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| 241 |
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| 242 | const EVP_PKEY_METHOD dsa_pkey_meth = {
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| 243 | EVP_PKEY_DSA,
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| 244 | EVP_PKEY_FLAG_AUTOARGLEN,
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| 245 | pkey_dsa_init,
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| 246 | pkey_dsa_copy,
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| 247 | pkey_dsa_cleanup,
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| 248 |
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| 249 | 0,
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| 250 | pkey_dsa_paramgen,
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| 251 |
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| 252 | 0,
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| 253 | pkey_dsa_keygen,
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| 254 |
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| 255 | 0,
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| 256 | pkey_dsa_sign,
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| 257 |
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| 258 | 0,
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| 259 | pkey_dsa_verify,
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| 260 |
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| 261 | 0, 0,
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| 262 |
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| 263 | 0, 0, 0, 0,
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| 264 |
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| 265 | 0, 0,
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| 266 |
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| 267 | 0, 0,
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| 268 |
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| 269 | 0, 0,
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| 270 |
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| 271 | pkey_dsa_ctrl,
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| 272 | pkey_dsa_ctrl_str
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| 273 | };
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