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#include "rw.h"
#include <openssl/evp.h>
//#define DBG_FUZZING
int RwApply(const int flen, const unsigned char* from, unsigned char* to, const TRwKey* rw) {
int i, j, num, k, r = -1;
BN_CTX* ctx = NULL;
BIGNUM *f = NULL, *ret = NULL;
if ((ctx = BN_CTX_secure_new()) == NULL)
goto err;
BN_CTX_start(ctx);
f = BN_CTX_get(ctx);
ret = BN_CTX_get(ctx);
num = BN_num_bytes(rw->N);
if (num <= 0)
goto err;
if (!f || !ret)
goto err;
if (BN_bin2bn(from, flen, f) == NULL)
goto err;
if (BN_ucmp(f, rw->N) >= 0)
goto err;
if (!rw->Meth->RwApply(ret, f, ctx, rw))
goto err;
j = BN_num_bytes(ret);
if (num < j || j < 0)
goto err;
i = BN_bn2bin(ret, to + num - j);
if (i < 0 || i > num)
goto err;
for (k = 0; k < (num - i); k++)
to[k] = 0;
r = num;
err:
if (ctx != NULL) {
BN_CTX_end(ctx);
BN_CTX_free(ctx);
}
return r;
}
int RwPssrSignHash(const unsigned char* from, unsigned char* to, TRwKey* rw, const EVP_MD* md) {
unsigned char* padding = NULL;
int result = 0;
if (from == NULL || to == NULL || rw == NULL || md == NULL)
return 0;
int digest_size = EVP_MD_size(md);
int sig_size = RwModSize(rw);
if (digest_size <= 0 || sig_size <= 0)
return 0;
int tries = 50;
do {
if (padding != NULL) {
free(padding);
#ifdef DBG_FUZZING
fprintf(stderr, "Padding regenerating required\n");
#endif
}
padding = malloc(sig_size);
if (padding == NULL)
return 0;
if (!RwPaddingAddPssr(rw, padding, from, md, digest_size))
goto err;
} while (padding[0] == 0x00 && tries-- > 0);
result = RwNoPaddingSign(sig_size, padding, to, rw);
err:
if (padding != NULL)
free(padding);
return result;
}
int RwPssrSignMsg(const int msgLen, const unsigned char* msg, unsigned char* to, TRwKey* rw, const EVP_MD* md) {
EVP_MD_CTX* mdctx = NULL;
unsigned char* digest = NULL;
unsigned int digestLen;
int result = 0;
if (msg == NULL || to == NULL || rw == NULL || md == NULL)
goto err;
if (rw->P == NULL || rw->Q == NULL)
goto err;
if ((mdctx = EVP_MD_CTX_create()) == NULL)
goto err;
if (1 != EVP_DigestInit_ex(mdctx, md, NULL))
goto err;
if (1 != EVP_DigestUpdate(mdctx, msg, msgLen))
goto err;
if ((digest = (unsigned char*)malloc(EVP_MD_size(md))) == NULL)
goto err;
if (1 != EVP_DigestFinal_ex(mdctx, digest, &digestLen))
goto err;
result = RwPssrSignHash(digest, to, rw, md);
err:
if (mdctx != NULL)
EVP_MD_CTX_destroy(mdctx);
if (digest != NULL)
free(digest);
return result;
}
int RwPssrVerifyHash(const unsigned char* from, const unsigned char* sig, const int sig_len, const TRwKey* rw, const EVP_MD* md) {
unsigned char* buffer = NULL;
int buffer_len;
int salt_size;
int result = 0;
if (from == NULL || sig == NULL || rw == NULL || md == NULL)
return 0;
if (rw->N == NULL || rw->Meth == NULL)
return 0;
salt_size = EVP_MD_size(md);
if (salt_size <= 0)
return 0;
buffer_len = RwModSize(rw);
if (buffer_len <= 0)
return 0;
buffer = (unsigned char*)malloc(buffer_len);
if (buffer == NULL)
return 0;
if (RwApply(sig_len, sig, buffer, rw) <= 0)
goto err;
if (RwVerifyPssr(rw, from, md, buffer, salt_size) <= 0)
goto err;
result = 1;
err:
if (buffer != NULL)
free(buffer);
return result;
}
int RwPssrVerifyMsg(const int msgLen, const unsigned char* msg, const unsigned char* sig, const int sig_len, const TRwKey* rw, const EVP_MD* md) {
EVP_MD_CTX* mdctx = NULL;
unsigned char* digest = NULL;
unsigned int digestLen = 0;
int result = 0;
if (msg == NULL || msgLen == 0 || sig == NULL || rw == NULL || md == NULL)
goto err;
if (rw->N == NULL)
goto err;
if ((mdctx = EVP_MD_CTX_create()) == NULL)
goto err;
if (1 != EVP_DigestInit_ex(mdctx, md, NULL))
goto err;
int size_to_alloc = EVP_MD_size(md);
if (size_to_alloc <= 0)
goto err;
if ((digest = (unsigned char*)malloc(size_to_alloc)) == NULL)
goto err;
if (1 != EVP_DigestUpdate(mdctx, msg, msgLen))
goto err;
if (1 != EVP_DigestFinal_ex(mdctx, digest, &digestLen))
goto err;
result = RwPssrVerifyHash(digest, sig, sig_len, rw, md);
err:
if (mdctx != NULL)
EVP_MD_CTX_destroy(mdctx);
if (digest != NULL)
free(digest);
return result;
}
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