AES encryption uses CBC or ECB mode, when the padding is PKCS5, the encrypted content is a multiple of 16 and will panic

[xueyc1f]

Hello,

I encountered an issue with the following code:

func TestAESPKCS5(t *testing.T) {
	key := "0123456789abcdef"
	cipher := dongle.NewCipher()
	cipher.SetMode(dongle.CBC)      // CBC、CFB、OFB、CTR、ECB
	cipher.SetPadding(dongle.PKCS5) // No、Zero、PKCS5、PKCS7、AnsiX923、ISO97971
	cipher.SetKey(key)              // key 长度必须是 16、24 或 32 字节
	cipher.SetIV(key)
	data := "0123456789abcdef0123456789abcdef"
	// data的长度是16的倍数会panic: crypto/aes: output not full block
	res := dongle.Encrypt.FromString(data).ByAes(cipher).ToHexString()
	// data的长度不是16的倍数则正常
	//res := dongle.Encrypt.FromString(data[:len(data)-1]).ByAes(cipher).ToHexString()
	println(res)
}

golang version: go version go1.20.5

dongle version: v0.2.8

I expected to get:

PKCS5填充实际调用的是PKCS7，但blockSize固定为8
改成：paddingText := bytes.Repeat([]byte{byte(blockSize)}, 16)就正常了，不太了解填充方式，不知道有没有其他问题

But I actually get:

panic: crypto/cipher: input not full blocks 

Thanks!

[JackLeeHal]

遇到了同样的问题，AES/ECB/PKCS5 模式下，加密串的长度超过16 就会panic。

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Encountered the same problem. In AES/ECB/PKCS5 mode, if the length of the encrypted string exceeds 16, it will panic.

[JackLeeHal]

https://github.com/golang-module/dongle/blob/main/cipher.go#L142

这里第二个参数应该传16而不是8

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https://github.com/golang-module/dongle/blob/main/cipher.go#L142

The second parameter here should be passed 16 instead of 8

[xflcx1991]

请尽快发版，这是aes加密模块的重大bug，此功能现在实际不可用

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---

Please release the version as soon as possible. This is a major bug in the aes encryption module. This function is not actually available now.

[gouguoyin]

请尽快发版，这是aes加密模块的重大bug，此功能现在实际不可用

PKCS5 是 PKCS7 的一种特例，先用 PKCS7 传入16 来取代 PKCS5

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Please release the version as soon as possible. This is a major bug in the aes encryption module. This function is not actually available now.

PKCS5 is a special case of PKCS7. First use PKCS7 to pass in 16 to replace PKCS5