/* crypto/asn1/a_verify.c */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * 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 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 acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS 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 AUTHOR OR 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. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ #include <stdio.h> #include <time.h> #include "cryptlib.h" #include "asn1_locl.h" #ifndef NO_SYS_TYPES_H # include <sys/types.h> #endif #include <openssl/bn.h> #include <openssl/x509.h> #include <openssl/objects.h> #include <openssl/buffer.h> #include <openssl/evp.h> #ifndef NO_ASN1_OLD int ASN1_verify(i2d_of_void *i2d, X509_ALGOR *a, ASN1_BIT_STRING *signature, char *data, EVP_PKEY *pkey) { EVP_MD_CTX ctx; const EVP_MD *type; unsigned char *p, *buf_in = NULL; int ret = -1, i, inl; EVP_MD_CTX_init(&ctx); i = OBJ_obj2nid(a->algorithm); type = EVP_get_digestbyname(OBJ_nid2sn(i)); if (type == NULL) { ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM); goto err; } if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) { ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT); goto err; } inl = i2d(data, NULL); buf_in = OPENSSL_malloc((unsigned int)inl); if (buf_in == NULL) { ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_MALLOC_FAILURE); goto err; } p = buf_in; i2d(data, &p); if (!EVP_VerifyInit_ex(&ctx, type, NULL) || !EVP_VerifyUpdate(&ctx, (unsigned char *)buf_in, inl)) { ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB); ret = 0; goto err; } OPENSSL_cleanse(buf_in, (unsigned int)inl); OPENSSL_free(buf_in); if (EVP_VerifyFinal(&ctx, (unsigned char *)signature->data, (unsigned int)signature->length, pkey) <= 0) { ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB); ret = 0; goto err; } /* * we don't need to zero the 'ctx' because we just checked public * information */ /* memset(&ctx,0,sizeof(ctx)); */ ret = 1; err: EVP_MD_CTX_cleanup(&ctx); return (ret); } #endif int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a, ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey) { EVP_MD_CTX ctx; unsigned char *buf_in = NULL; int ret = -1, inl; int mdnid, pknid; if (!pkey) { ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_PASSED_NULL_PARAMETER); return -1; } if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) { ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT); return -1; } EVP_MD_CTX_init(&ctx); /* Convert signature OID into digest and public key OIDs */ if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid)) { ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM); goto err; } if (mdnid == NID_undef) { if (!pkey->ameth || !pkey->ameth->item_verify) { ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM); goto err; } ret = pkey->ameth->item_verify(&ctx, it, asn, a, signature, pkey); /* * Return value of 2 means carry on, anything else means we exit * straight away: either a fatal error of the underlying verification * routine handles all verification. */ if (ret != 2) goto err; ret = -1; } else { const EVP_MD *type; type = EVP_get_digestbynid(mdnid); if (type == NULL) { ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM); goto err; } /* Check public key OID matches public key type */ if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id) { ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_WRONG_PUBLIC_KEY_TYPE); goto err; } if (!EVP_DigestVerifyInit(&ctx, NULL, type, NULL, pkey)) { ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB); ret = 0; goto err; } } inl = ASN1_item_i2d(asn, &buf_in, it); if (buf_in == NULL) { ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_MALLOC_FAILURE); goto err; } if (!EVP_DigestVerifyUpdate(&ctx, buf_in, inl)) { ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB); ret = 0; goto err; } OPENSSL_cleanse(buf_in, (unsigned int)inl); OPENSSL_free(buf_in); if (EVP_DigestVerifyFinal(&ctx, signature->data, (size_t)signature->length) <= 0) { ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB); ret = 0; goto err; } /* * we don't need to zero the 'ctx' because we just checked public * information */ /* memset(&ctx,0,sizeof(ctx)); */ ret = 1; err: EVP_MD_CTX_cleanup(&ctx); return (ret); }