From aad22ba2c6172508f70263bcf53f6af6257c8b14 Mon Sep 17 00:00:00 2001 From: Matt Caswell Date: Thu, 27 Oct 2016 18:32:36 +0100 Subject: [PATCH] Make sure ossltest engine works with TLS1.3 This might need more changes once we do a "real" TLS1.3 ciphersuite. But it should do for now. Reviewed-by: Rich Salz --- engines/e_ossltest.c | 86 +++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 85 insertions(+), 1 deletion(-) diff --git a/engines/e_ossltest.c b/engines/e_ossltest.c index b4c83cb7c3..6b006a4440 100644 --- a/engines/e_ossltest.c +++ b/engines/e_ossltest.c @@ -226,7 +226,7 @@ static int ossltest_ciphers(ENGINE *, const EVP_CIPHER **, const int **, int); static int ossltest_cipher_nids[] = { - NID_aes_128_cbc, 0 + NID_aes_128_cbc, NID_aes_128_gcm, 0 }; /* AES128 */ @@ -235,6 +235,12 @@ int ossltest_aes128_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, const unsigned char *iv, int enc); int ossltest_aes128_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl); +int ossltest_aes128_gcm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, + const unsigned char *iv, int enc); +int ossltest_aes128_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, + const unsigned char *in, size_t inl); +static int ossltest_aes128_gcm_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, + void *ptr); static EVP_CIPHER *_hidden_aes_128_cbc = NULL; static const EVP_CIPHER *ossltest_aes_128_cbc(void) @@ -258,9 +264,38 @@ static const EVP_CIPHER *ossltest_aes_128_cbc(void) } return _hidden_aes_128_cbc; } +static EVP_CIPHER *_hidden_aes_128_gcm = NULL; +#define AES_GCM_FLAGS (EVP_CIPH_FLAG_DEFAULT_ASN1 \ + | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER \ + | EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT \ + | EVP_CIPH_CUSTOM_COPY |EVP_CIPH_FLAG_AEAD_CIPHER \ + | EVP_CIPH_GCM_MODE) +static const EVP_CIPHER *ossltest_aes_128_gcm(void) +{ + if (_hidden_aes_128_gcm == NULL + && ((_hidden_aes_128_gcm = EVP_CIPHER_meth_new(NID_aes_128_gcm, + 1 /* block size */, + 16 /* key len */)) == NULL + || !EVP_CIPHER_meth_set_iv_length(_hidden_aes_128_gcm,12) + || !EVP_CIPHER_meth_set_flags(_hidden_aes_128_gcm, AES_GCM_FLAGS) + || !EVP_CIPHER_meth_set_init(_hidden_aes_128_gcm, + ossltest_aes128_gcm_init_key) + || !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_128_gcm, + ossltest_aes128_gcm_cipher) + || !EVP_CIPHER_meth_set_ctrl(_hidden_aes_128_gcm, + ossltest_aes128_gcm_ctrl) + || !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_128_gcm, + EVP_CIPHER_impl_ctx_size(EVP_aes_128_gcm())))) { + EVP_CIPHER_meth_free(_hidden_aes_128_gcm); + _hidden_aes_128_gcm = NULL; + } + return _hidden_aes_128_gcm; +} + static void destroy_ciphers(void) { EVP_CIPHER_meth_free(_hidden_aes_128_cbc); + EVP_CIPHER_meth_free(_hidden_aes_128_gcm); _hidden_aes_128_cbc = NULL; } @@ -389,6 +424,9 @@ static int ossltest_ciphers(ENGINE *e, const EVP_CIPHER **cipher, case NID_aes_128_cbc: *cipher = ossltest_aes_128_cbc(); break; + case NID_aes_128_gcm: + *cipher = ossltest_aes_128_gcm(); + break; default: ok = 0; *cipher = NULL; @@ -566,3 +604,49 @@ int ossltest_aes128_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, return ret; } + +int ossltest_aes128_gcm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, + const unsigned char *iv, int enc) +{ + return EVP_CIPHER_meth_get_init(EVP_aes_128_gcm()) (ctx, key, iv, enc); +} + + +int ossltest_aes128_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, + const unsigned char *in, size_t inl) +{ + unsigned char *tmpbuf; + const size_t datalen = inl - EVP_GCM_TLS_EXPLICIT_IV_LEN + - EVP_GCM_TLS_TAG_LEN; + + tmpbuf = OPENSSL_malloc(datalen); + if (tmpbuf == NULL) + return -1; + + /* Remember what we were asked to encrypt */ + memcpy(tmpbuf, in + EVP_GCM_TLS_EXPLICIT_IV_LEN, datalen); + + /* Go through the motions of encrypting it */ + EVP_CIPHER_meth_get_do_cipher(EVP_aes_128_gcm())(ctx, out, in, inl); + + /* + * Throw it all away and just use the plaintext as the output with empty + * IV and tag + */ + memset(out, 0, inl); + memcpy(out + EVP_GCM_TLS_EXPLICIT_IV_LEN, tmpbuf, datalen); + OPENSSL_free(tmpbuf); + + return 1; +} + +static int ossltest_aes128_gcm_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, + void *ptr) +{ + int ret; + + /* Pass the ctrl down */ + ret = EVP_CIPHER_meth_get_ctrl(EVP_aes_128_gcm())(ctx, type, arg, ptr); + + return ret; +} -- 2.25.1