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https://gitlab.torproject.org/tpo/core/tor.git
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Roger Dingledine
105 lines
2.3 KiB
C
105 lines
2.3 KiB
C
/**
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* crypto.c
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* Crypto calls.
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*
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* Matej Pfajfar <mp292@cam.ac.uk>
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*/
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/*
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* Changes :
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* $Log$
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* Revision 1.1 2002/06/26 22:45:50 arma
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* Initial revision
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*
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* Revision 1.1 2002/04/02 14:28:01 badbytes
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* Final finishes.
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*
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*/
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#include <malloc.h>
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#include <unistd.h>
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#include <openssl/err.h>
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#include <openssl/evp.h>
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#include "../common/log.h"
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#include "crypto.h"
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int crypt_f(unsigned char *buf, size_t buflen, crypt_path_t **cpath, size_t cpathlen)
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{
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int i=0;
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int retval = 0;
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unsigned char *ciphertext = NULL;
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crypt_path_t *thishop;
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/* allocate the ciphertext buffer */
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ciphertext = (unsigned char *)malloc(buflen);
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if (!ciphertext)
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{
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log(LOG_ERR,"Error allocating memory.");
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return -1;
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}
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for (i=0; i < cpathlen; i++) /* moving from last to first hop
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* Remember : cpath is in reverse order, i.e. last hop first
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*/
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{
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log(LOG_DEBUG,"crypt_f() : Processing hop %u",cpathlen-i);
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thishop = cpath[i];
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/* encrypt */
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retval = EVP_EncryptUpdate(&thishop->f_ctx,ciphertext, &buflen, buf, buflen);
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if (!retval) /* error */
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{
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log(LOG_ERR,"Error performing encryption:%s",ERR_reason_error_string(ERR_get_error()));
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free(ciphertext);
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return -1;
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}
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/* copy ciphertext back to buf */
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memcpy((void *)buf,(void *)ciphertext,buflen);
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}
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free((void *)ciphertext);
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return 0;
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}
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int crypt_b(unsigned char *buf, size_t buflen, crypt_path_t **cpath, size_t cpathlen)
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{
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int i=0;
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int retval=0;
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unsigned char *plaintext=NULL;
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crypt_path_t *thishop;
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/* allocate the plaintext buffer */
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plaintext = (unsigned char *)malloc(buflen);
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if (!plaintext)
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{
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log(LOG_ERR,"Error allocating memory.");
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return -1;
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}
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for (i=cpathlen-1; i >= 0; i--) /* moving from first to last hop
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* Remember : cpath is in reverse order, i.e. last hop first
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*/
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{
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thishop = cpath[i];
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/* encrypt */
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retval = EVP_DecryptUpdate(&thishop->b_ctx,plaintext, &buflen, buf, buflen);
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if (!retval) /* error */
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{
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log(LOG_ERR,"Error performing decryption:%s",ERR_reason_error_string(ERR_get_error()));
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free(plaintext);
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return -1;
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}
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/* copy plaintext back to buf */
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memcpy((void *)buf,(void *)plaintext,buflen);
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}
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free(plaintext);
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return 0;
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}
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