e2ec048a09
Nice deduplication and brings the GCM decrypt speed up to par. internal/speed$ benchstat old new name old time/op new time/op delta StupidGCM-4 4.71µs ± 0% 4.66µs ± 0% -0.99% (p=0.008 n=5+5) StupidGCMDecrypt-4 5.77µs ± 1% 4.51µs ± 0% -21.80% (p=0.008 n=5+5) name old speed new speed delta StupidGCM-4 870MB/s ± 0% 879MB/s ± 0% +1.01% (p=0.008 n=5+5) StupidGCMDecrypt-4 710MB/s ± 1% 908MB/s ± 0% +27.87% (p=0.008 n=5+5)
46 lines
988 B
Go
46 lines
988 B
Go
// +build !without_openssl
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// Package stupidgcm is a thin wrapper for OpenSSL's GCM encryption and
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// decryption functions. It only support 32-byte keys and 16-bit IVs.
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package stupidgcm
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// #include <openssl/evp.h>
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import "C"
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import (
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"crypto/cipher"
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"log"
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)
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const (
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// BuiltWithoutOpenssl indicates if openssl been disabled at compile-time
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BuiltWithoutOpenssl = false
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keyLen = 32
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ivLen = 16
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tagLen = 16
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)
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// StupidGCM implements the cipher.AEAD interface
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type StupidGCM struct {
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stupidAEADCommon
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}
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// Verify that we satisfy the interface
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var _ cipher.AEAD = &StupidGCM{}
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// New returns a new cipher.AEAD implementation..
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func New(keyIn []byte, forceDecode bool) cipher.AEAD {
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if len(keyIn) != keyLen {
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log.Panicf("Only %d-byte keys are supported", keyLen)
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}
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return &StupidGCM{
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stupidAEADCommon{
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// Create a private copy of the key
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key: append([]byte{}, keyIn...),
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openSSLEVPCipher: C.EVP_aes_256_gcm(),
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nonceSize: ivLen,
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},
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}
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}
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