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FF1 to support crypto engine who does padding #21

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FF1 to support crypto engine who does padding #21

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6 changes: 5 additions & 1 deletion ff1/ff1.go
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Original file line number Diff line number Diff line change
Expand Up @@ -599,7 +599,11 @@ func (c Cipher) ciph(input []byte) ([]byte, error) {
return nil, errors.New("length of ciph input must be multiple of 16")
}

c.cbcEncryptor.CryptBlocks(input, input)
// Some crypto engines (e.g. PKCS7) always do padding (i.e. additional block is added), we need output buffer one block bigger
ciphertext := make([]byte, len(input)+blockSize)
c.cbcEncryptor.CryptBlocks(ciphertext, input)
// This FF1 implementation is update buffer in-place, copy result back to input
copy(input, ciphertext[:len(input)])

// Reset IV to 0
c.cbcEncryptor.(cbcMode).SetIV(ivZero)
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