/* $OpenBSD: pem_seal.c,v 1.23 2016/11/05 11:32:45 miod Exp $ */ /* 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 #include #include /* for OPENSSL_NO_RSA */ #ifndef OPENSSL_NO_RSA #include #include #include #include #include #include static void PEM_ENCODE_SEAL_CTX_cleanup(PEM_ENCODE_SEAL_CTX *ctx) { EVP_CIPHER_CTX_cleanup(&ctx->cipher); EVP_MD_CTX_cleanup(&ctx->md); explicit_bzero(&ctx->encode, sizeof(ctx->encode)); } int PEM_SealInit(PEM_ENCODE_SEAL_CTX *ctx, EVP_CIPHER *type, EVP_MD *md_type, unsigned char **ek, int *ekl, unsigned char *iv, EVP_PKEY **pubk, int npubk) { unsigned char key[EVP_MAX_KEY_LENGTH]; int ret = -1; int i, j, max = 0; char *s = NULL; /* * Make sure ctx is properly initialized so that we can always pass * it to PEM_ENCODE_SEAL_CTX_cleanup() in the error path. */ EVP_EncodeInit(&ctx->encode); EVP_MD_CTX_init(&ctx->md); EVP_CIPHER_CTX_init(&ctx->cipher); for (i = 0; i < npubk; i++) { if (pubk[i]->type != EVP_PKEY_RSA) { PEMerr(PEM_F_PEM_SEALINIT, PEM_R_PUBLIC_KEY_NO_RSA); goto err; } j = RSA_size(pubk[i]->pkey.rsa); if (j > max) max = j; } s = reallocarray(NULL, max, 2); if (s == NULL) { PEMerr(PEM_F_PEM_SEALINIT, ERR_R_MALLOC_FAILURE); goto err; } if (!EVP_SignInit(&ctx->md, md_type)) goto err; ret = EVP_SealInit(&ctx->cipher, type, ek, ekl, iv, pubk, npubk); if (ret <= 0) goto err; /* base64 encode the keys */ for (i = 0; i < npubk; i++) { j = EVP_EncodeBlock((unsigned char *)s, ek[i], RSA_size(pubk[i]->pkey.rsa)); ekl[i] = j; memcpy(ek[i], s, j + 1); } ret = npubk; if (0) { err: PEM_ENCODE_SEAL_CTX_cleanup(ctx); } free(s); explicit_bzero(key, sizeof(key)); return (ret); } void PEM_SealUpdate(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *out, int *outl, unsigned char *in, int inl) { unsigned char buffer[1600]; int i, j; *outl = 0; EVP_SignUpdate(&ctx->md, in, inl); for (;;) { if (inl <= 0) break; if (inl > 1200) i = 1200; else i = inl; EVP_EncryptUpdate(&ctx->cipher, buffer, &j, in, i); EVP_EncodeUpdate(&ctx->encode, out, &j, buffer, j); *outl += j; out += j; in += i; inl -= i; } } int PEM_SealFinal(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *sig, int *sigl, unsigned char *out, int *outl, EVP_PKEY *priv) { unsigned char *s = NULL; int ret = 0, j; unsigned int i; if (priv->type != EVP_PKEY_RSA) { PEMerr(PEM_F_PEM_SEALFINAL, PEM_R_PUBLIC_KEY_NO_RSA); goto err; } i = RSA_size(priv->pkey.rsa); if (i < 100) i = 100; s = reallocarray(NULL, i, 2); if (s == NULL) { PEMerr(PEM_F_PEM_SEALFINAL, ERR_R_MALLOC_FAILURE); goto err; } if (!EVP_EncryptFinal_ex(&ctx->cipher, s, (int *)&i)) goto err; EVP_EncodeUpdate(&ctx->encode, out, &j, s, i); *outl = j; out += j; EVP_EncodeFinal(&ctx->encode, out, &j); *outl += j; if (!EVP_SignFinal(&ctx->md, s, &i, priv)) goto err; *sigl = EVP_EncodeBlock(sig, s, i); ret = 1; err: PEM_ENCODE_SEAL_CTX_cleanup(ctx); free(s); return (ret); } #endif