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package tools
import (
"crypto/aes"
"crypto/cipher"
"errors"
)
// AesCBCDecrypt AEC解密（ ）
func AesCBCDecrypt ( encryptData , key , iv [ ] byte ) ( [ ] byte , error ) {
block , err := aes . NewCipher ( key )
if err != nil {
return nil , err
}
blockSize := block . BlockSize ( )
if len ( encryptData ) < blockSize {
return nil , errors . New ( "ciphertext too short" )
}
if len ( encryptData ) % blockSize != 0 {
return nil , errors . New ( "ciphertext is not a multiple of the block size" )
}
mode := cipher . NewCBCDecrypter ( block , iv )
mode . CryptBlocks ( encryptData , encryptData )
// 解填充
encryptData = PKCS7UnPadding ( encryptData )
return encryptData , nil
}
// PKCS7UnPadding 对密文删除填充
func PKCS7UnPadding ( origData [ ] byte ) [ ] byte {
length := len ( origData )
unpadding := int ( origData [ length - 1 ] )
return origData [ : ( length - unpadding ) ]
}
