+static int enc_read(BIO *b, char *out, int outl)
+{
+ int ret = 0, i;
+ BIO_ENC_CTX *ctx;
+
+ if (out == NULL)
+ return (0);
+ ctx = (BIO_ENC_CTX *)b->ptr;
+
+ if ((ctx == NULL) || (b->next_bio == NULL))
+ return (0);
+
+ /* First check if there are bytes decoded/encoded */
+ if (ctx->buf_len > 0) {
+ i = ctx->buf_len - ctx->buf_off;
+ if (i > outl)
+ i = outl;
+ memcpy(out, &(ctx->buf[ctx->buf_off]), i);
+ ret = i;
+ out += i;
+ outl -= i;
+ ctx->buf_off += i;
+ if (ctx->buf_len == ctx->buf_off) {
+ ctx->buf_len = 0;
+ ctx->buf_off = 0;
+ }
+ }
+
+ /*
+ * At this point, we have room of outl bytes and an empty buffer, so we
+ * should read in some more.
+ */
+
+ while (outl > 0) {
+ if (ctx->cont <= 0)
+ break;
+
+ /*
+ * read in at IV offset, read the EVP_Cipher documentation about why
+ */
+ i = BIO_read(b->next_bio, &(ctx->buf[BUF_OFFSET]), ENC_BLOCK_SIZE);
+
+ if (i <= 0) {
+ /* Should be continue next time we are called? */
+ if (!BIO_should_retry(b->next_bio)) {
+ ctx->cont = i;
+ i = EVP_CipherFinal_ex(&(ctx->cipher),
+ (unsigned char *)ctx->buf,
+ &(ctx->buf_len));
+ ctx->ok = i;
+ ctx->buf_off = 0;
+ } else {
+ ret = (ret == 0) ? i : ret;
+ break;
+ }
+ } else {
+ if (!EVP_CipherUpdate(&(ctx->cipher),
+ (unsigned char *)ctx->buf, &ctx->buf_len,
+ (unsigned char *)&(ctx->buf[BUF_OFFSET]),
+ i)) {
+ BIO_clear_retry_flags(b);
+ return 0;
+ }
+ ctx->cont = 1;
+ /*
+ * Note: it is possible for EVP_CipherUpdate to decrypt zero
+ * bytes because this is or looks like the final block: if this
+ * happens we should retry and either read more data or decrypt
+ * the final block
+ */
+ if (ctx->buf_len == 0)
+ continue;
+ }
+
+ if (ctx->buf_len <= outl)
+ i = ctx->buf_len;
+ else
+ i = outl;
+ if (i <= 0)
+ break;
+ memcpy(out, ctx->buf, i);
+ ret += i;
+ ctx->buf_off = i;
+ outl -= i;
+ out += i;
+ }
+
+ BIO_clear_retry_flags(b);
+ BIO_copy_next_retry(b);
+ return ((ret == 0) ? ctx->cont : ret);
+}
+
+static int enc_write(BIO *b, const char *in, int inl)
+{
+ int ret = 0, n, i;
+ BIO_ENC_CTX *ctx;
+
+ ctx = (BIO_ENC_CTX *)b->ptr;
+ ret = inl;
+
+ BIO_clear_retry_flags(b);
+ n = ctx->buf_len - ctx->buf_off;
+ while (n > 0) {
+ i = BIO_write(b->next_bio, &(ctx->buf[ctx->buf_off]), n);
+ if (i <= 0) {
+ BIO_copy_next_retry(b);
+ return (i);
+ }
+ ctx->buf_off += i;
+ n -= i;
+ }
+ /* at this point all pending data has been written */
+
+ if ((in == NULL) || (inl <= 0))
+ return (0);
+
+ ctx->buf_off = 0;
+ while (inl > 0) {
+ n = (inl > ENC_BLOCK_SIZE) ? ENC_BLOCK_SIZE : inl;
+ if (!EVP_CipherUpdate(&(ctx->cipher),
+ (unsigned char *)ctx->buf, &ctx->buf_len,
+ (unsigned char *)in, n)) {
+ BIO_clear_retry_flags(b);
+ return 0;
+ }
+ inl -= n;
+ in += n;
+
+ ctx->buf_off = 0;
+ n = ctx->buf_len;
+ while (n > 0) {
+ i = BIO_write(b->next_bio, &(ctx->buf[ctx->buf_off]), n);
+ if (i <= 0) {
+ BIO_copy_next_retry(b);
+ return (ret == inl) ? i : ret - inl;
+ }
+ n -= i;
+ ctx->buf_off += i;
+ }
+ ctx->buf_len = 0;
+ ctx->buf_off = 0;
+ }
+ BIO_copy_next_retry(b);
+ return (ret);
+}
+
+static long enc_ctrl(BIO *b, int cmd, long num, void *ptr)
+{
+ BIO *dbio;
+ BIO_ENC_CTX *ctx, *dctx;
+ long ret = 1;
+ int i;
+ EVP_CIPHER_CTX **c_ctx;
+
+ ctx = (BIO_ENC_CTX *)b->ptr;
+
+ switch (cmd) {
+ case BIO_CTRL_RESET:
+ ctx->ok = 1;
+ ctx->finished = 0;
+ if (!EVP_CipherInit_ex(&(ctx->cipher), NULL, NULL, NULL, NULL,
+ ctx->cipher.encrypt))
+ return 0;
+ ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
+ break;
+ case BIO_CTRL_EOF: /* More to read */
+ if (ctx->cont <= 0)
+ ret = 1;
+ else
+ ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
+ break;
+ case BIO_CTRL_WPENDING:
+ ret = ctx->buf_len - ctx->buf_off;
+ if (ret <= 0)
+ ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
+ break;
+ case BIO_CTRL_PENDING: /* More to read in buffer */
+ ret = ctx->buf_len - ctx->buf_off;
+ if (ret <= 0)
+ ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
+ break;
+ case BIO_CTRL_FLUSH:
+ /* do a final write */
+ again:
+ while (ctx->buf_len != ctx->buf_off) {
+ i = enc_write(b, NULL, 0);
+ if (i < 0)
+ return i;
+ }
+
+ if (!ctx->finished) {
+ ctx->finished = 1;
+ ctx->buf_off = 0;
+ ret = EVP_CipherFinal_ex(&(ctx->cipher),
+ (unsigned char *)ctx->buf,
+ &(ctx->buf_len));
+ ctx->ok = (int)ret;
+ if (ret <= 0)
+ break;
+
+ /* push out the bytes */
+ goto again;
+ }
+
+ /* Finally flush the underlying BIO */
+ ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
+ break;
+ case BIO_C_GET_CIPHER_STATUS:
+ ret = (long)ctx->ok;
+ break;
+ case BIO_C_DO_STATE_MACHINE:
+ BIO_clear_retry_flags(b);
+ ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
+ BIO_copy_next_retry(b);
+ break;
+ case BIO_C_GET_CIPHER_CTX:
+ c_ctx = (EVP_CIPHER_CTX **)ptr;
+ (*c_ctx) = &(ctx->cipher);
+ b->init = 1;
+ break;
+ case BIO_CTRL_DUP:
+ dbio = (BIO *)ptr;
+ dctx = (BIO_ENC_CTX *)dbio->ptr;
+ EVP_CIPHER_CTX_init(&dctx->cipher);
+ ret = EVP_CIPHER_CTX_copy(&dctx->cipher, &ctx->cipher);
+ if (ret)
+ dbio->init = 1;
+ break;
+ default:
+ ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
+ break;
+ }
+ return (ret);
+}
+
+static long enc_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
+{
+ long ret = 1;
+
+ if (b->next_bio == NULL)
+ return (0);
+ switch (cmd) {
+ default:
+ ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
+ break;
+ }
+ return (ret);
+}
+
+/*-