+ if (outl > ENC_MIN_CHUNK) {
+ /*
+ * Depending on flags block cipher decrypt can write
+ * one extra block and then back off, i.e. output buffer
+ * has to accommodate extra block...
+ */
+ int j = outl - blocksize, buf_len;
+
+ if (!EVP_CipherUpdate(ctx->cipher,
+ (unsigned char *)out, &buf_len,
+ ctx->read_start, i > j ? j : i)) {
+ BIO_clear_retry_flags(b);
+ return 0;
+ }
+ ret += buf_len;
+ out += buf_len;
+ outl -= buf_len;
+
+ if ((i -= j) <= 0) {
+ ctx->read_start = ctx->read_end;
+ continue;
+ }
+ ctx->read_start += j;
+ }
+ if (i > ENC_MIN_CHUNK)
+ i = ENC_MIN_CHUNK;