1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] */ 56 57 #include <openssl/asn1.h> 58 #include <openssl/digest.h> 59 #include <openssl/err.h> 60 #include <openssl/evp.h> 61 #include <openssl/mem.h> 62 #include <openssl/obj.h> 63 #include <openssl/x509.h> 64 65 #include "../evp/internal.h" 66 67 68 int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2, 69 ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey, 70 const EVP_MD *type) 71 { 72 EVP_MD_CTX ctx; 73 EVP_MD_CTX_init(&ctx); 74 if (!EVP_DigestSignInit(&ctx, NULL, type, NULL, pkey)) 75 { 76 EVP_MD_CTX_cleanup(&ctx); 77 return 0; 78 } 79 return ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, &ctx); 80 } 81 82 83 int ASN1_item_sign_ctx(const ASN1_ITEM *it, 84 X509_ALGOR *algor1, X509_ALGOR *algor2, 85 ASN1_BIT_STRING *signature, void *asn, EVP_MD_CTX *ctx) 86 { 87 EVP_PKEY *pkey; 88 unsigned char *buf_in=NULL,*buf_out=NULL; 89 size_t inl=0,outl=0,outll=0; 90 91 pkey = EVP_PKEY_CTX_get0_pkey(ctx->pctx); 92 93 /* Write out the requested copies of the AlgorithmIdentifier. */ 94 if (algor1 && !EVP_DigestSignAlgorithm(ctx, algor1)) 95 { 96 goto err; 97 } 98 if (algor2 && !EVP_DigestSignAlgorithm(ctx, algor2)) 99 { 100 goto err; 101 } 102 103 inl=ASN1_item_i2d(asn,&buf_in, it); 104 outll=outl=EVP_PKEY_size(pkey); 105 buf_out=OPENSSL_malloc((unsigned int)outl); 106 if ((buf_in == NULL) || (buf_out == NULL)) 107 { 108 outl=0; 109 OPENSSL_PUT_ERROR(X509, ASN1_item_sign_ctx, ERR_R_MALLOC_FAILURE); 110 goto err; 111 } 112 113 if (!EVP_DigestSignUpdate(ctx, buf_in, inl) 114 || !EVP_DigestSignFinal(ctx, buf_out, &outl)) 115 { 116 outl=0; 117 OPENSSL_PUT_ERROR(X509, ASN1_item_sign_ctx, ERR_R_EVP_LIB); 118 goto err; 119 } 120 if (signature->data != NULL) OPENSSL_free(signature->data); 121 signature->data=buf_out; 122 buf_out=NULL; 123 signature->length=outl; 124 /* In the interests of compatibility, I'll make sure that 125 * the bit string has a 'not-used bits' value of 0 126 */ 127 signature->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); 128 signature->flags|=ASN1_STRING_FLAG_BITS_LEFT; 129 err: 130 EVP_MD_CTX_cleanup(ctx); 131 if (buf_in != NULL) 132 { OPENSSL_cleanse((char *)buf_in,(unsigned int)inl); OPENSSL_free(buf_in); } 133 if (buf_out != NULL) 134 { OPENSSL_cleanse((char *)buf_out,outll); OPENSSL_free(buf_out); } 135 return(outl); 136 } 137
