/* $OpenBSD: dsa_pmeth.c,v 1.21 2024/10/19 14:39:44 tb Exp $ */ /* 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 #include #include #include #include #include #include #include #include #include "bn_local.h" #include "dsa_local.h" #include "evp_local.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 = 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; free(dctx); } static int pkey_dsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *out_siglen, const unsigned char *tbs, size_t tbslen) { DSA *dsa = ctx->pkey->pkey.dsa; DSA_PKEY_CTX *dctx = ctx->data; unsigned int siglen; *out_siglen = 0; if (tbslen > INT_MAX) return 0; if (dctx->md != NULL) { if (tbslen != EVP_MD_size(dctx->md)) return 0; } if (!DSA_sign(0, tbs, tbslen, sig, &siglen, dsa)) return 0; *out_siglen = siglen; 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) { DSA *dsa = ctx->pkey->pkey.dsa; DSA_PKEY_CTX *dctx = ctx->data; if (tbslen > INT_MAX || siglen > INT_MAX) return 0; if (dctx->md != NULL) { if (tbslen != EVP_MD_size(dctx->md)) return 0; } return DSA_verify(0, tbs, tbslen, sig, siglen, dsa); } 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: switch (EVP_MD_type((const EVP_MD *)p2)) { case NID_sha1: case NID_sha224: case NID_sha256: break; default: DSAerror(DSA_R_INVALID_DIGEST_TYPE); return 0; } dctx->md = p2; return 1; case EVP_PKEY_CTRL_MD: /* ANSI X9.57 and NIST CSOR. */ switch (EVP_MD_type(p2)) { case NID_sha1: case NID_dsa: case NID_dsaWithSHA: case NID_sha224: case NID_sha256: case NID_sha384: case NID_sha512: case NID_sha3_224: case NID_sha3_256: case NID_sha3_384: case NID_sha3_512: break; default: DSAerror(DSA_R_INVALID_DIGEST_TYPE); return 0; } dctx->md = p2; return 1; case EVP_PKEY_CTRL_GET_MD: *(const EVP_MD **)p2 = dctx->md; 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: DSAerror(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) { const char *errstr; if (!strcmp(type, "dsa_paramgen_bits")) { int nbits; nbits = strtonum(value, INT_MIN, INT_MAX, &errstr); if (errstr != NULL) return -2; return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits); } else if (!strcmp(type, "dsa_paramgen_q_bits")) { int qbits; qbits = strtonum(value, INT_MIN, INT_MAX, &errstr); if (errstr != NULL) return -2; return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN, EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS, qbits, NULL); } else 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; DSA_PKEY_CTX *dctx = ctx->data; BN_GENCB *pcb = NULL; BN_GENCB cb = {0}; int ret = 0; if ((dsa = DSA_new()) == NULL) goto err; if (ctx->pkey_gencb != NULL) { pcb = &cb; evp_pkey_set_cb_translate(pcb, ctx); } if (!dsa_builtin_paramgen(dsa, dctx->nbits, dctx->qbits, dctx->pmd, NULL, 0, NULL, NULL, NULL, pcb)) goto err; if (!EVP_PKEY_assign_DSA(pkey, dsa)) goto err; dsa = NULL; ret = 1; err: DSA_free(dsa); return ret; } static int pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) { DSA *dsa = NULL; int ret = 0; if (ctx->pkey == NULL) { DSAerror(DSA_R_NO_PARAMETERS_SET); goto err; } if ((dsa = DSA_new()) == NULL) goto err; if (!EVP_PKEY_set1_DSA(pkey, dsa)) goto err; if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey)) goto err; if (!DSA_generate_key(dsa)) goto err; ret = 1; err: DSA_free(dsa); return ret; } const EVP_PKEY_METHOD dsa_pkey_meth = { .pkey_id = EVP_PKEY_DSA, .flags = EVP_PKEY_FLAG_AUTOARGLEN, .init = pkey_dsa_init, .copy = pkey_dsa_copy, .cleanup = pkey_dsa_cleanup, .paramgen = pkey_dsa_paramgen, .keygen = pkey_dsa_keygen, .sign = pkey_dsa_sign, .verify = pkey_dsa_verify, .ctrl = pkey_dsa_ctrl, .ctrl_str = pkey_dsa_ctrl_str };