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28 lines
682 B
28 lines
682 B
3 years ago
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package crypto
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import (
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"crypto/rsa"
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"crypto/sha1" // #nosec
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"encoding/binary"
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"math/big"
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"github.com/gotd/td/bin"
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)
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// RSAFingerprint returns fingerprint of RSA public key as defined in MTProto.
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func RSAFingerprint(key *rsa.PublicKey) int64 {
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e := big.NewInt(int64(key.E))
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// See "Creating an Authorization Key" for reference:
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// * https://core.telegram.org/mtproto/auth_key#dh-exchange-initiation
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// rsa_public_key n:string e:string = RSAPublicKey
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buf := new(bin.Buffer)
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buf.PutBytes(key.N.Bytes())
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buf.PutBytes(e.Bytes())
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h := sha1.New() // #nosec
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_, _ = h.Write(buf.Buf)
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result := h.Sum(nil)[12:sha1.Size]
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return int64(binary.LittleEndian.Uint64(result))
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}
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