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191 lines
6.4 KiB
191 lines
6.4 KiB
/* crypto/pem/pem_seal.c */ |
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
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* All rights reserved. |
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* |
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* This package is an SSL implementation written |
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* by Eric Young (eay@cryptsoft.com). |
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* The implementation was written so as to conform with Netscapes SSL. |
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* |
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* This library is free for commercial and non-commercial use as long as |
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* the following conditions are aheared to. The following conditions |
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* apply to all code found in this distribution, be it the RC4, RSA, |
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation |
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* included with this distribution is covered by the same copyright terms |
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* except that the holder is Tim Hudson (tjh@cryptsoft.com). |
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* |
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* Copyright remains Eric Young's, and as such any Copyright notices in |
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* the code are not to be removed. |
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* If this package is used in a product, Eric Young should be given attribution |
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* as the author of the parts of the library used. |
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* This can be in the form of a textual message at program startup or |
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* in documentation (online or textual) provided with the package. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. All advertising materials mentioning features or use of this software |
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* must display the following acknowledgement: |
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* "This product includes cryptographic software written by |
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* Eric Young (eay@cryptsoft.com)" |
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* The word 'cryptographic' can be left out if the rouines from the library |
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* being used are not cryptographic related :-). |
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* 4. If you include any Windows specific code (or a derivative thereof) from |
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* the apps directory (application code) you must include an acknowledgement: |
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
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* |
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* The licence and distribution terms for any publically available version or |
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* derivative of this code cannot be changed. i.e. this code cannot simply be |
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* copied and put under another distribution licence |
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* [including the GNU Public Licence.] |
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*/ |
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#include <openssl/opensslconf.h> /* for OPENSSL_NO_RSA */ |
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#ifndef OPENSSL_NO_RSA |
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# include <stdio.h> |
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# include "cryptlib.h" |
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# include <openssl/evp.h> |
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# include <openssl/rand.h> |
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# include <openssl/objects.h> |
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# include <openssl/x509.h> |
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# include <openssl/pem.h> |
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# include <openssl/rsa.h> |
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int PEM_SealInit(PEM_ENCODE_SEAL_CTX *ctx, EVP_CIPHER *type, EVP_MD *md_type, |
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unsigned char **ek, int *ekl, unsigned char *iv, |
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EVP_PKEY **pubk, int npubk) |
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{ |
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unsigned char key[EVP_MAX_KEY_LENGTH]; |
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int ret = -1; |
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int i, j, max = 0; |
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char *s = NULL; |
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for (i = 0; i < npubk; i++) { |
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if (pubk[i]->type != EVP_PKEY_RSA) { |
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PEMerr(PEM_F_PEM_SEALINIT, PEM_R_PUBLIC_KEY_NO_RSA); |
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goto err; |
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} |
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j = RSA_size(pubk[i]->pkey.rsa); |
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if (j > max) |
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max = j; |
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} |
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s = (char *)OPENSSL_malloc(max * 2); |
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if (s == NULL) { |
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PEMerr(PEM_F_PEM_SEALINIT, ERR_R_MALLOC_FAILURE); |
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goto err; |
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} |
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EVP_EncodeInit(&ctx->encode); |
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EVP_MD_CTX_init(&ctx->md); |
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if (!EVP_SignInit(&ctx->md, md_type)) |
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goto err; |
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EVP_CIPHER_CTX_init(&ctx->cipher); |
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ret = EVP_SealInit(&ctx->cipher, type, ek, ekl, iv, pubk, npubk); |
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if (ret <= 0) |
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goto err; |
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/* base64 encode the keys */ |
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for (i = 0; i < npubk; i++) { |
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j = EVP_EncodeBlock((unsigned char *)s, ek[i], |
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RSA_size(pubk[i]->pkey.rsa)); |
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ekl[i] = j; |
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memcpy(ek[i], s, j + 1); |
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} |
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ret = npubk; |
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err: |
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if (s != NULL) |
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OPENSSL_free(s); |
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OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH); |
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return (ret); |
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} |
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void PEM_SealUpdate(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *out, int *outl, |
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unsigned char *in, int inl) |
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{ |
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unsigned char buffer[1600]; |
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int i, j; |
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*outl = 0; |
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EVP_SignUpdate(&ctx->md, in, inl); |
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for (;;) { |
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if (inl <= 0) |
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break; |
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if (inl > 1200) |
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i = 1200; |
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else |
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i = inl; |
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EVP_EncryptUpdate(&ctx->cipher, buffer, &j, in, i); |
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EVP_EncodeUpdate(&ctx->encode, out, &j, buffer, j); |
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*outl += j; |
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out += j; |
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in += i; |
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inl -= i; |
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} |
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} |
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int PEM_SealFinal(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *sig, int *sigl, |
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unsigned char *out, int *outl, EVP_PKEY *priv) |
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{ |
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unsigned char *s = NULL; |
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int ret = 0, j; |
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unsigned int i; |
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if (priv->type != EVP_PKEY_RSA) { |
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PEMerr(PEM_F_PEM_SEALFINAL, PEM_R_PUBLIC_KEY_NO_RSA); |
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goto err; |
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} |
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i = RSA_size(priv->pkey.rsa); |
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if (i < 100) |
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i = 100; |
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s = (unsigned char *)OPENSSL_malloc(i * 2); |
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if (s == NULL) { |
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PEMerr(PEM_F_PEM_SEALFINAL, ERR_R_MALLOC_FAILURE); |
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goto err; |
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} |
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if (!EVP_EncryptFinal_ex(&ctx->cipher, s, (int *)&i)) |
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goto err; |
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EVP_EncodeUpdate(&ctx->encode, out, &j, s, i); |
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*outl = j; |
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out += j; |
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EVP_EncodeFinal(&ctx->encode, out, &j); |
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*outl += j; |
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if (!EVP_SignFinal(&ctx->md, s, &i, priv)) |
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goto err; |
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*sigl = EVP_EncodeBlock(sig, s, i); |
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ret = 1; |
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err: |
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EVP_MD_CTX_cleanup(&ctx->md); |
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EVP_CIPHER_CTX_cleanup(&ctx->cipher); |
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if (s != NULL) |
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OPENSSL_free(s); |
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return (ret); |
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} |
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#else /* !OPENSSL_NO_RSA */ |
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# if PEDANTIC |
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static void *dummy = &dummy; |
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# endif |
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#endif
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