int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
unsigned char *key, unsigned char *iv, int enc)
{
- if(enc) enc = 1;
+ if(enc && (enc != -1)) enc = 1;
if (cipher) {
ctx->cipher=cipher;
ctx->key_len = cipher->key_len;
+ if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
+ if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
+ EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
+ return 0;
+ }
+ }
} else if(!ctx->cipher) {
EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_NO_CIPHER_SET);
return 0;
if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
}
- ctx->encrypt=enc;
+ if(enc != -1) ctx->encrypt=enc;
ctx->buf_len=0;
return 1;
}
int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
{
+ if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
+ return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
if(c->key_len == keylen) return 1;
if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH))
{
EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH,EVP_R_INVALID_KEY_LENGTH);
return 0;
}
+
+int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
+{
+ int ret;
+ if(!ctx->cipher) {
+ EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
+ return 0;
+ }
+
+ if(!ctx->cipher->ctrl) {
+ EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
+ return 0;
+ }
+
+ ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
+ if(ret == -1) {
+ EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
+ return 0;
+ }
+ return ret;
+}