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common/crypto_openssl: load legacy provider in decrypt_rfbdes() #610

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merged 1 commit into from
Mar 28, 2024
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common/crypto_openssl: load legacy provider in decrypt_rfbdes() #610

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25 changes: 23 additions & 2 deletions src/common/crypto_openssl.c
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Original file line number Diff line number Diff line change
Expand Up @@ -115,24 +115,45 @@ int encrypt_rfbdes(void *out, int *out_len, const unsigned char key[8], const vo
int decrypt_rfbdes(void *out, int *out_len, const unsigned char key[8], const void *in, const size_t in_len)
{
int result = 0;
EVP_CIPHER_CTX *des;
EVP_CIPHER_CTX *des = NULL;
unsigned char mungedkey[8];
int i;
#if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
OSSL_PROVIDER *providerLegacy = NULL;
OSSL_PROVIDER *providerDefault = NULL;
#endif

for (i = 0; i < 8; i++)
mungedkey[i] = reverseByte(key[i]);

#if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
/* Load Multiple providers into the default (NULL) library context */
if (!(providerLegacy = OSSL_PROVIDER_load(NULL, "legacy")))
goto out;
if (!(providerDefault = OSSL_PROVIDER_load(NULL, "default")))
goto out;
#endif

if(!(des = EVP_CIPHER_CTX_new()))
goto out;
if(!EVP_DecryptInit_ex(des, EVP_des_ecb(), NULL, mungedkey, NULL))
goto out;
if(!EVP_CIPHER_CTX_set_padding(des, 0))
goto out;
if(!EVP_DecryptUpdate(des, out, out_len, in, in_len))
goto out;

result = 1;

out:
EVP_CIPHER_CTX_free(des);
if (des)
EVP_CIPHER_CTX_free(des);
#if (OPENSSL_VERSION_NUMBER >= 0x30000000L)
if (providerLegacy)
OSSL_PROVIDER_unload(providerLegacy);
if (providerDefault)
OSSL_PROVIDER_unload(providerDefault);
#endif
return result;
}

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