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cosmetic clarification of a comment

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fduncanh
2021-11-05 21:12:27 -04:00
parent 7d622cd934
commit ab110a7ce8
1 changed files with 5 additions and 4 deletions
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9
lib/raop_buffer.c
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@@ -180,10 +180,11 @@ raop_buffer_decrypt(raop_buffer_t *raop_buffer, unsigned char *data, unsigned ch
/* Adding 15 to encryptedlen in the call to aes_cbc_decrypt is a fix (hack) to ensure that */
/* all encryptedlen encrypted bytes are decrypted .*/
/* The implementation of aes_cbc_decrypt in crypto.c calls OpenSSL function EVP_EncryptUpdate */
/* but does not call EVP_EncryptFinal_ex to finalize the decryption of the packet. */
/* Without the fix, the last 16 encrypted bytes are lost; */
/* with the fix all (encryptedlen + 15) /16 * 16 = encryptedlen encrypted bytes are written into output,*/
/* with no risk of buffer overflow */
/* but does not call EVP_EncryptFinal to finalize the decryption of the packet. */
/* Instead the finalization of the < 16 remaining (unencrypted) bytes is done here. */
/* Without the fix, the last 16 encrypted bytes are lost by EVP_EncryptUpdate; */
/* with the fix all (encryptedlen + 15) /16 * 16 = encryptedlen decrypted encrypted-bytes are */
/* written into output, with no risk of buffer overflow */
aes_cbc_decrypt(aes_ctx_audio, &data[12], output, encryptedlen + 15);