Adam Van Ymeren
7a04f298d2
- update to latest telegram layer - remove some references to fields in tg.Entities that don't exist in the schema - originally added here: https://github.com/beeper/td/commit/820929062a2ba0104397bc01235ab58a9cff780e - referenced here - https://github.com/mautrix/telegramgo/commit/124f0967ed195b5a380c9bd02e170ada9710dde3 - https://github.com/mautrix/telegramgo/commit/4205047aab2e0639217148b5d125bfaab668bd8e
54 lines
1.2 KiB
Go
54 lines
1.2 KiB
Go
package crypto
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import (
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"crypto/rsa"
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// #nosec
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//
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// Allowing sha1 because it is used in MTProto itself.
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"crypto/sha1"
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"math/big"
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)
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// RSAKeyBits is RSA key size.
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//
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// Can be used as rsa.GenerateKey(src, RSAKeyBits).
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const RSAKeyBits = 2048
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const (
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rsaLen = 256
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rsaWithHashLen = 255
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rsaDataLen = rsaWithHashLen - sha1.Size
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)
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// RSAPublicDecrypt recovers the message digest from the raw signature
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// using the signer’s RSA public key.
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//
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// See also OpenSSL’s RSA_public_decrypt with RSA_NO_PADDING.
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func RSAPublicDecrypt(pub *rsa.PublicKey, sig []byte) ([]byte, error) {
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k := pub.Size()
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if k < 11 || k != len(sig) {
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return nil, rsa.ErrVerification
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}
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c := new(big.Int).SetBytes(sig)
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e := big.NewInt(int64(pub.E))
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m := new(big.Int).Exp(c, e, pub.N)
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return m.Bytes(), nil
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}
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func rsaEncrypt(data []byte, key *rsa.PublicKey) []byte {
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z := new(big.Int).SetBytes(data)
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e := big.NewInt(int64(key.E))
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c := new(big.Int).Exp(z, e, key.N)
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res := make([]byte, rsaLen)
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c.FillBytes(res)
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return res
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}
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func rsaDecrypt(data []byte, key *rsa.PrivateKey, to []byte) bool {
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c := new(big.Int).SetBytes(data)
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m := new(big.Int).Exp(c, key.D, key.N)
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return FillBytes(m, to)
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}
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