/* * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the OpenSSL license (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ #include #include "internal/cryptlib.h" #include #include #include #include #include "internal/evp_int.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(*dctx)); if (dctx == NULL) 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; 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; unsigned int sltmp; DSA_PKEY_CTX *dctx = ctx->data; DSA *dsa = ctx->pkey->pkey.dsa; if (dctx->md) { if (tbslen != (size_t)EVP_MD_size(dctx->md)) return 0; } else { if (tbslen != SHA_DIGEST_LENGTH) return 0; } ret = DSA_sign(0, 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; DSA_PKEY_CTX *dctx = ctx->data; DSA *dsa = ctx->pkey->pkey.dsa; if (dctx->md) { if (tbslen != (size_t)EVP_MD_size(dctx->md)) return 0; } else { if (tbslen != SHA_DIGEST_LENGTH) return 0; } ret = DSA_verify(0, 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->pmd = 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 && EVP_MD_type((const EVP_MD *)p2) != NID_sha384 && EVP_MD_type((const EVP_MD *)p2) != NID_sha512) { DSAerr(DSA_F_PKEY_DSA_CTRL, 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: 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") == 0) { int nbits; nbits = atoi(value); return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits); } if (strcmp(type, "dsa_paramgen_q_bits") == 0) { 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") == 0) { 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; int ret; if (ctx->pkey_gencb) { pcb = BN_GENCB_new(); if (pcb == NULL) return 0; evp_pkey_set_cb_translate(pcb, ctx); } else pcb = NULL; dsa = DSA_new(); if (dsa == NULL) { BN_GENCB_free(pcb); return 0; } ret = dsa_builtin_paramgen(dsa, dctx->nbits, dctx->qbits, dctx->pmd, NULL, 0, NULL, NULL, NULL, pcb); BN_GENCB_free(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 == NULL) 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 };