diff --git a/src/crypto/rsa/rsa.go b/src/crypto/rsa/rsa.go index 0715421187..c73f5e4882 100644 --- a/src/crypto/rsa/rsa.go +++ b/src/crypto/rsa/rsa.go @@ -495,6 +495,25 @@ func encrypt(pub *PublicKey, plaintext []byte) ([]byte, error) { return bigmod.NewNat().ExpShort(m, e, N).Bytes(N), nil } +// EncryptNoPadding encrypts plaintext using no padding scheme. +// +// The given plaintext will be left-padded with zeros if it's smaller than +// pub.Size(). This needs to be considered when using [DecryptNoPadding] +// to retrieve the original message. +// +// WARNING: This should only be used to implement cryptographically sound +// padding schemes in the application code. Encrypting user data directly +// with this function is insecure. +func EncryptNoPadding(pub *PublicKey, plaintext []byte) ([]byte, error) { + if err := checkPub(pub); err != nil { + return nil, err + } + if len(plaintext) > pub.Size() { + return nil, ErrMessageTooLong + } + return encrypt(pub, plaintext) +} + // EncryptOAEP encrypts the given message with RSA-OAEP. // // OAEP is parameterised by a hash function that is used as a random oracle. @@ -695,6 +714,20 @@ func decrypt(priv *PrivateKey, ciphertext []byte, check bool) ([]byte, error) { return m.Bytes(N), nil } +// DecryptNoPadding decrypts ciphertext using no padding scheme. +// +// The returned plaintext (assuming no errors) will be left-padded with +// zeros to match priv.Size() bytes. See [EncryptNoPadding] for details. +func DecryptNoPadding(priv *PrivateKey, ciphertext []byte) ([]byte, error) { + if err := checkPub(&priv.PublicKey); err != nil { + return nil, err + } + if len(ciphertext) > priv.Size() { + return nil, ErrDecryption + } + return decrypt(priv, ciphertext, noCheck) +} + // DecryptOAEP decrypts ciphertext using RSA-OAEP. // // OAEP is parameterised by a hash function that is used as a random oracle. diff --git a/src/crypto/rsa/rsa_test.go b/src/crypto/rsa/rsa_test.go index 3278a7ff30..cba9e346e6 100644 --- a/src/crypto/rsa/rsa_test.go +++ b/src/crypto/rsa/rsa_test.go @@ -880,3 +880,303 @@ var testEncryptOAEPData = []testEncryptOAEPStruct{ }, }, } + +func TestEncryptDecryptNoPadding(t *testing.T) { + testData := []struct { + keyBits int + messages [][]byte + }{ + { + keyBits: 1024, + messages: [][]byte{ + { + 0x48, 0xFE, 0x33, 0x2D, 0xA2, 0xFD, 0xA4, 0x39, + 0x4A, 0x4D, 0x5B, 0x10, 0x69, 0x79, 0x66, 0x55, + }, + { + 0xF9, 0xA4, 0xCE, 0x85, 0x20, 0xE2, 0xA3, 0xA5, + 0x7D, 0xAF, 0x66, 0x71, 0x03, 0x55, 0xA5, 0xA7, + 0x3B, 0x43, 0x69, 0x2A, 0xA1, 0x63, 0x71, 0x97, + 0xCE, 0x22, 0xEF, 0x27, 0x8E, 0xEF, 0xE8, 0x19, + }, + { + 0x1A, 0x69, 0xC2, 0xBE, 0x7E, 0x3C, 0x55, 0xA1, + 0xF8, 0xAD, 0x6C, 0xE0, 0xF8, 0x94, 0xCF, 0xB8, + 0xF5, 0x60, 0xE2, 0xD5, 0x38, 0x24, 0x3B, 0xBD, + 0x07, 0xA9, 0x99, 0x96, 0x97, 0x82, 0x6A, 0x8A, + 0x09, 0xD7, 0x0C, 0x50, 0x79, 0x4F, 0x82, 0x4C, + 0x6B, 0x16, 0x7B, 0x77, 0xD7, 0x32, 0x99, 0x03, + }, + { + 0x0B, 0xAE, 0x77, 0x84, 0xDD, 0x49, 0x31, 0x19, + 0x75, 0xC7, 0x9D, 0x96, 0xC6, 0x44, 0xB9, 0x29, + 0xB4, 0xA0, 0xE9, 0x84, 0x32, 0x39, 0xDF, 0xFD, + 0x6F, 0xCC, 0x71, 0xDE, 0x13, 0x6A, 0xD7, 0xA3, + 0xD4, 0xE6, 0x1E, 0x03, 0xF5, 0xC5, 0xA7, 0x3F, + 0x00, 0xD9, 0x4A, 0xE4, 0xE0, 0xAA, 0x61, 0x37, + 0x88, 0xD0, 0x9C, 0x18, 0x47, 0x74, 0xD9, 0xEB, + 0xE6, 0x1F, 0xED, 0xBC, 0xF5, 0x06, 0x4D, 0x50, + }, + { + 0x94, 0xDC, 0x4B, 0x5F, 0x69, 0x7E, 0x6A, 0x80, + 0x86, 0x4A, 0x97, 0x50, 0x80, 0x4B, 0x74, 0xC4, + 0x01, 0x29, 0x81, 0xE5, 0xA4, 0xAE, 0x8D, 0xD5, + 0x1E, 0xC8, 0xD0, 0x71, 0x00, 0xE4, 0x02, 0x44, + 0xAD, 0x29, 0x1C, 0xDE, 0x59, 0x9E, 0x71, 0xF7, + 0x08, 0x58, 0x6F, 0x66, 0xBB, 0x3C, 0x2A, 0x05, + 0xD7, 0xDD, 0xD7, 0x59, 0x81, 0x81, 0xBE, 0x4A, + 0xF6, 0x19, 0xF5, 0x31, 0x92, 0x49, 0xCE, 0xA9, + 0xA0, 0xE4, 0xE9, 0x08, 0xFB, 0xF6, 0x76, 0x67, + 0x98, 0x2E, 0xFD, 0x33, 0xF9, 0x5F, 0xFD, 0x29, + }, + { + 0xCD, 0x0E, 0x3B, 0x84, 0x5A, 0xF7, 0xF5, 0x06, + 0x1E, 0xE3, 0x99, 0xAF, 0x86, 0x13, 0x6F, 0x8F, + 0xC3, 0xB5, 0x39, 0x61, 0x9A, 0x2E, 0x18, 0xCB, + 0x0C, 0x47, 0x53, 0x89, 0x96, 0x78, 0x85, 0xE2, + 0xB3, 0xEF, 0x4E, 0x89, 0xE8, 0x0F, 0xDF, 0x4F, + 0xF7, 0x42, 0x19, 0xBB, 0x71, 0x31, 0x97, 0x7D, + 0xFC, 0x3C, 0xC1, 0x92, 0x20, 0x8C, 0x87, 0x4E, + 0xC1, 0x74, 0x0B, 0xDA, 0xEF, 0xAB, 0x02, 0x0A, + 0xAD, 0x5B, 0x01, 0x93, 0x68, 0x0E, 0x4C, 0xCE, + 0x6E, 0x89, 0xB4, 0x99, 0x60, 0x85, 0x26, 0x89, + 0x0A, 0x6F, 0x87, 0x12, 0x6B, 0xD6, 0x4B, 0xF1, + 0xE6, 0x1B, 0x46, 0x1A, 0x0E, 0x41, 0x05, 0x6D, + }, + { + 0x60, 0x35, 0x91, 0x3D, 0xBE, 0x98, 0xFD, 0x34, + 0xE5, 0x34, 0xC8, 0xE4, 0x0D, 0xCB, 0x9F, 0xE0, + 0x58, 0xA3, 0x3B, 0x6D, 0x1E, 0x97, 0x7A, 0xF6, + 0xE5, 0xCE, 0x5D, 0x75, 0xE6, 0x09, 0xA8, 0x67, + 0xE8, 0x99, 0x32, 0x11, 0xB6, 0x87, 0x3A, 0xB0, + 0x40, 0x18, 0x67, 0x30, 0xEF, 0x51, 0xD0, 0x4D, + 0xB7, 0x48, 0x7D, 0x95, 0xDD, 0xF2, 0x47, 0x0F, + 0xBB, 0x60, 0x8F, 0x7D, 0x63, 0xA4, 0xE8, 0xDD, + 0x28, 0x31, 0x45, 0xE7, 0x93, 0x71, 0x1C, 0x84, + 0xE3, 0xD4, 0xD9, 0x92, 0x2C, 0x5D, 0x57, 0x5B, + 0x58, 0x8B, 0xC0, 0x64, 0x91, 0xFC, 0xCC, 0xA6, + 0x40, 0xEB, 0x3B, 0x52, 0x6C, 0x6D, 0x4C, 0xCA, + 0x11, 0x12, 0x56, 0xD3, 0x8F, 0xF8, 0x62, 0x9C, + 0xAF, 0xAB, 0xC7, 0xE1, 0x3E, 0x4A, 0x2F, 0xAA, + }, + { + 0x00, 0xE7, 0x33, 0x00, 0xA9, 0x71, 0xF6, 0xEE, + 0xF2, 0x45, 0x33, 0x84, 0x23, 0xB2, 0x41, 0x03, + 0xF4, 0x3A, 0x02, 0x63, 0xC0, 0xB8, 0x2D, 0xF1, + 0x1A, 0xB7, 0xE0, 0x80, 0x2E, 0xD6, 0x86, 0x57, + 0x22, 0xD3, 0x6E, 0xC7, 0x4C, 0x46, 0xAD, 0xFE, + 0x0F, 0x0A, 0xEB, 0xB9, 0x44, 0x9B, 0x22, 0x3C, + 0x44, 0x92, 0x9B, 0xC7, 0xD1, 0x49, 0xE8, 0x0F, + 0xE9, 0xBA, 0x95, 0x5B, 0xD6, 0x94, 0x5A, 0xC2, + 0xAD, 0x99, 0x4C, 0x47, 0x57, 0xB6, 0xC5, 0x57, + 0x4A, 0x42, 0xD6, 0x65, 0x24, 0x06, 0x88, 0x7D, + 0xE1, 0xF6, 0xBA, 0x0A, 0x4B, 0x7A, 0x43, 0x52, + 0x65, 0xCB, 0x8E, 0xA0, 0x6D, 0xAE, 0xDB, 0x5D, + 0x9F, 0xC8, 0xC3, 0x52, 0x47, 0x6F, 0xE5, 0xFE, + 0xCF, 0x51, 0x28, 0x06, 0x9D, 0x2C, 0xD6, 0xE1, + 0xC0, 0xA2, 0xB2, 0x57, 0x4D, 0x5D, 0x9B, 0x90, + 0x17, 0x4D, 0xD3, 0xCE, 0xCB, 0x85, 0x0E, 0xEC, + }, + }, + }, + { + keyBits: 2048, + messages: [][]byte{ + { + 0xA8, 0xD8, 0x1C, 0xE0, 0x38, 0x7A, 0xE8, 0x5E, + 0x3F, 0x5C, 0x4B, 0xF8, 0x70, 0x14, 0x61, 0x4B, + 0x63, 0x99, 0x31, 0x6F, 0x93, 0xBE, 0xB1, 0xAF, + 0xDC, 0x67, 0x5F, 0x7B, 0xC5, 0xDB, 0xAB, 0x35, + }, + { + 0x99, 0xA8, 0x7B, 0x18, 0xD8, 0x44, 0xFF, 0xA6, + 0x1F, 0xA0, 0x90, 0x64, 0x2A, 0xE6, 0x12, 0x43, + 0x3C, 0x4A, 0x70, 0x73, 0xC4, 0x01, 0x7D, 0x5C, + 0x4E, 0xB6, 0xD7, 0x50, 0x64, 0xC0, 0xF2, 0x24, + 0x6B, 0x4A, 0x08, 0xB5, 0xAD, 0x6D, 0x42, 0x25, + 0x5E, 0x7B, 0x2B, 0x4C, 0xA3, 0x07, 0x93, 0x57, + 0x4B, 0x3C, 0x1E, 0x4F, 0x1A, 0x68, 0x5F, 0xE0, + 0x62, 0xE5, 0x23, 0xF0, 0x9E, 0xD0, 0x18, 0xA9, + }, + { + 0x6C, 0x51, 0x2A, 0x55, 0xDF, 0x74, 0x9C, 0x60, + 0x53, 0x85, 0xF9, 0x4E, 0xFA, 0xDB, 0xA3, 0x25, + 0x2D, 0x53, 0xC7, 0x03, 0x04, 0x04, 0x56, 0xEE, + 0x04, 0x9D, 0x79, 0x7A, 0x0D, 0xF7, 0xA8, 0xEB, + 0xBC, 0xC9, 0x82, 0x02, 0xCE, 0x03, 0xCA, 0x9E, + 0x76, 0x88, 0xBD, 0x8E, 0xAF, 0x12, 0x70, 0xBA, + 0x81, 0xAF, 0x00, 0xF7, 0xA2, 0x68, 0xAF, 0x66, + 0xB1, 0xA4, 0xBC, 0x8C, 0x25, 0xCA, 0xE5, 0xA2, + 0x26, 0x44, 0x92, 0x4B, 0x9D, 0x3D, 0xCF, 0x2B, + 0x0F, 0x31, 0x84, 0xD2, 0x2F, 0x75, 0x33, 0xDB, + 0xD0, 0x26, 0xDB, 0x74, 0x1E, 0xF3, 0x0C, 0x12, + 0x6F, 0x87, 0x7D, 0xC2, 0x5F, 0x93, 0xF8, 0x5A, + }, + { + 0x71, 0x52, 0xA9, 0x2B, 0xB3, 0xDE, 0x88, 0xDE, + 0x0A, 0x68, 0xB1, 0x3B, 0x4F, 0x48, 0x19, 0x61, + 0xFC, 0x72, 0x56, 0x43, 0xB0, 0x58, 0xFB, 0x7D, + 0x2A, 0x6B, 0x8E, 0xA2, 0x0B, 0xF6, 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0xCC, 0xD5, 0xF3, 0xA0, 0x0A, 0x43, 0xA3, 0x90, + 0x4D, 0x12, 0x92, 0x5E, 0x77, 0xC5, 0x21, 0xCD, + 0x26, 0xBA, 0x52, 0x10, 0x7C, 0x14, 0x39, 0x4E, + 0x80, 0x60, 0x06, 0x0B, 0x8A, 0xC5, 0x50, 0xB0, + 0x7D, 0x01, 0x5A, 0x61, 0xCA, 0x59, 0x09, 0x31, + 0x2C, 0xB3, 0xF7, 0x02, 0x32, 0x32, 0x11, 0xA8, + 0xCB, 0xF4, 0x93, 0xA5, 0x42, 0x01, 0x9A, 0x34, + 0x76, 0x25, 0x8B, 0xCE, 0x55, 0x89, 0xFD, 0x3F, + 0xC4, 0x0E, 0xA9, 0x18, 0x99, 0xFD, 0xED, 0xDC, + 0xE9, 0x28, 0x14, 0xE0, 0x70, 0xBE, 0x96, 0x54, + 0xA7, 0xE1, 0x73, 0x81, 0x20, 0xF4, 0x56, 0x39, + 0x62, 0xA4, 0x56, 0xE9, 0xD2, 0xAE, 0xA8, 0xD0, + 0xC5, 0xA5, 0xBC, 0x4E, 0xBE, 0x0E, 0xD1, 0x57, + 0x89, 0xB6, 0x5E, 0x75, 0x02, 0x9C, 0x02, 0x31, + 0x4E, 0x22, 0xDC, 0x0F, 0x7B, 0x45, 0x0B, 0xEC, + 0xA5, 0xFD, 0xD2, 0x63, 0x4E, 0x30, 0x14, 0xA2, + 0xE8, 0xC0, 0x27, 0x6D, 0xF2, 0x1E, 0x9B, 0xE1, + 0xA5, 0xF2, 0xEF, 0x61, 0xE2, 0xD4, 0xAA, 0x34, + 0xD0, 0x15, 0x24, 0xCF, 0x1B, 0xB9, 0xA1, 0x68, + 0xDC, 0x7F, 0x17, 0xF7, 0xE7, 0x38, 0xD7, 0x68, + 0xDE, 0xF8, 0x5C, 0x15, 0x0B, 0x00, 0xBC, 0x29, + 0x28, 0x73, 0x57, 0x0C, 0xA2, 0x9E, 0x66, 0x97, + 0x2A, 0xD3, 0xE5, 0xE7, 0xF4, 0x93, 0x92, 0x60, + 0xEE, 0x14, 0x83, 0x67, 0x19, 0x07, 0xC8, 0x7F, + 0xA2, 0xA8, 0x03, 0x73, 0x92, 0x41, 0xDF, 0x1C, + }, + { + 0x00, 0x0C, 0xF2, 0xB2, 0xB1, 0xB4, 0xF9, 0x60, + 0x1C, 0x2A, 0x63, 0x99, 0x49, 0x9E, 0x81, 0x9C, + 0x3F, 0x5A, 0xDF, 0xFD, 0x1A, 0x3C, 0x04, 0x01, + 0x63, 0x97, 0x8D, 0xD3, 0x38, 0x0B, 0x11, 0x2D, + 0x29, 0x8B, 0x35, 0xA9, 0x5B, 0xE5, 0x06, 0x61, + 0xE7, 0x70, 0xCD, 0x6F, 0x6A, 0x67, 0x3A, 0x9C, + 0x81, 0xB0, 0xCC, 0x76, 0xDA, 0xF9, 0xCD, 0x83, + 0x89, 0x67, 0xFA, 0x2E, 0x97, 0x8F, 0xAD, 0x8B, + 0x87, 0xD7, 0xAA, 0x85, 0xC3, 0x86, 0x42, 0x29, + 0xDC, 0x6E, 0xE3, 0xAE, 0x8A, 0xF7, 0x7A, 0x8D, + 0x50, 0x27, 0x08, 0x65, 0xF3, 0x00, 0x5D, 0x1F, + 0xB7, 0x59, 0x88, 0x68, 0x2D, 0x03, 0xF2, 0xF8, + 0x44, 0xAB, 0x3E, 0xCD, 0x4F, 0x46, 0x04, 0xA1, + 0x78, 0xF4, 0x76, 0x89, 0x60, 0xD1, 0xE9, 0xBE, + 0xC6, 0x58, 0x03, 0xC7, 0xCB, 0x58, 0x65, 0x92, + 0x1C, 0x06, 0xDF, 0x2A, 0x14, 0x48, 0x8C, 0x98, + 0xA2, 0xBD, 0xA5, 0x75, 0x80, 0x3E, 0x95, 0x57, + 0x57, 0x5E, 0xD8, 0x86, 0x17, 0xE9, 0xE5, 0x06, + 0x1E, 0xA9, 0xFE, 0x66, 0x5F, 0x14, 0xB6, 0x8C, + 0x73, 0xA6, 0x7A, 0x47, 0x47, 0x7E, 0xD5, 0x1C, + 0xE3, 0x01, 0xB1, 0x2C, 0x11, 0x02, 0x79, 0xE7, + 0x86, 0x19, 0x40, 0xA4, 0x6D, 0xF0, 0x9E, 0x4B, + 0x5B, 0x1B, 0xAF, 0xAD, 0xA8, 0x31, 0xC1, 0x2B, + 0x6D, 0xE4, 0x84, 0x23, 0x66, 0xB3, 0xD0, 0xA2, + 0xE2, 0x21, 0xD4, 0x99, 0xFE, 0xD7, 0xA4, 0xD1, + 0xF0, 0xC5, 0x7F, 0x42, 0x8F, 0xC0, 0xFF, 0x7C, + 0xC9, 0xF6, 0xEB, 0xA0, 0xD2, 0x53, 0xDE, 0x3A, + 0xB6, 0x27, 0x0B, 0x01, 0x0F, 0xAE, 0xD2, 0x19, + 0x5A, 0xAB, 0x6D, 0xD6, 0xDF, 0x25, 0x0E, 0x0D, + 0x39, 0xFD, 0x9D, 0x12, 0xAF, 0x49, 0x4F, 0xD3, + 0x7F, 0xA5, 0xC1, 0xEC, 0xEB, 0x6A, 0x9D, 0x77, + 0xBF, 0x54, 0xC3, 0x7E, 0xF1, 0xFE, 0xF0, 0xB1, + }, + }, + }, + } + + zeroPadded := func(keyBytes int, message []byte) []byte { + result := make([]byte, keyBytes) + offset := keyBytes - len(message) + copy(result[offset:], message) + return result + } + + for i, test := range testData { + priv, err := GenerateKey(rand.Reader, test.keyBits) + if err != nil { + t.Errorf("GenerateKey(%d): %v", test.keyBits, err) + } + + keyBytes := test.keyBits / 8 + for j, message := range test.messages { + enc, err := EncryptNoPadding(&priv.PublicKey, message) + if err != nil { + t.Errorf("EncryptNoPadding: %v", err) + continue + } + + dec, err := DecryptNoPadding(priv, enc) + if err != nil { + t.Errorf("DecryptNoPadding: %v", err) + continue + } + + zMessage := zeroPadded(keyBytes, message) + if !bytes.Equal(dec, zMessage) { + t.Errorf("#%d,%d: round trip %q -> %q", i, j, zMessage, dec) + } + } + } +}