RT3757: base64 encoding bugs
Rewrite EVP_DecodeUpdate. In particular: reject extra trailing padding, and padding in the middle of the content. Don't limit line length. Add tests. Previously, the behaviour was ill-defined, and depended on the position of the padding within the input. In addition, this appears to fix a possible two-byte oob read. Reviewed-by: NRichard Levitte <levitte@openssl.org> Reviewed-by: NRich Salz <rsalz@openssl.org> Reviewed-by: NDr Stephen Henson <steve@openssl.org>
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