| EVP_chacha20.pod (1.1.1.4) | EVP_chacha20.pod (1.1.1.5) |
|---|---|
| 1=pod 2 3=head1 NAME 4 5EVP_chacha20, 6EVP_chacha20_poly1305 7- EVP ChaCha20 stream cipher 8 --- 8 unchanged lines hidden (view full) --- 17 18The ChaCha20 stream cipher for EVP. 19 20=over 4 21 22=item EVP_chacha20() 23 24The ChaCha20 stream cipher. The key length is 256 bits, the IV is 128 bits long. | 1=pod 2 3=head1 NAME 4 5EVP_chacha20, 6EVP_chacha20_poly1305 7- EVP ChaCha20 stream cipher 8 --- 8 unchanged lines hidden (view full) --- 17 18The ChaCha20 stream cipher for EVP. 19 20=over 4 21 22=item EVP_chacha20() 23 24The ChaCha20 stream cipher. The key length is 256 bits, the IV is 128 bits long. |
| 25The first 32 bits consists of a counter in little-endian order followed by a 96 | 25The first 64 bits consists of a counter in little-endian order followed by a 64 |
| 26bit nonce. For example a nonce of: 27 | 26bit nonce. For example a nonce of: 27 |
| 28000000000000000000000002 | 280000000000000002 |
| 29 30With an initial counter of 42 (2a in hex) would be expressed as: 31 322a000000000000000000000000000002 33 34=item EVP_chacha20_poly1305() 35 36Authenticated encryption with ChaCha20-Poly1305. Like EVP_chacha20(), the key 37is 256 bits and the IV is 96 bits. This supports additional authenticated data 38(AAD) and produces a 128-bit authentication tag. See the 39L<EVP_EncryptInit(3)/AEAD Interface> section for more information. 40 41=back 42 43=head1 NOTES 44 45Developers should be aware of the negative performance implications of 46calling these functions multiple times and should consider using | 29 30With an initial counter of 42 (2a in hex) would be expressed as: 31 322a000000000000000000000000000002 33 34=item EVP_chacha20_poly1305() 35 36Authenticated encryption with ChaCha20-Poly1305. Like EVP_chacha20(), the key 37is 256 bits and the IV is 96 bits. This supports additional authenticated data 38(AAD) and produces a 128-bit authentication tag. See the 39L<EVP_EncryptInit(3)/AEAD Interface> section for more information. 40 41=back 42 43=head1 NOTES 44 45Developers should be aware of the negative performance implications of 46calling these functions multiple times and should consider using |
| 47L | 47L<EVP_CIPHER_fetch(3)> with L<EVP_CIPHER-CHACHA(7)> instead. |
| 48See L<crypto(7)/Performance> for further information. 49 | 48See L<crypto(7)/Performance> for further information. 49 |
| 50L<RFC 7539|https://www.rfc-editor.org/rfc/rfc7539.html#section-2.4> 51uses a 32 bit counter and a 96 bit nonce for the IV. 52 |
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| 50=head1 RETURN VALUES 51 52These functions return an B<EVP_CIPHER> structure that contains the 53implementation of the symmetric cipher. See L<EVP_CIPHER_meth_new(3)> for 54details of the B<EVP_CIPHER> structure. 55 56=head1 SEE ALSO 57 --- 15 unchanged lines hidden --- | 53=head1 RETURN VALUES 54 55These functions return an B<EVP_CIPHER> structure that contains the 56implementation of the symmetric cipher. See L<EVP_CIPHER_meth_new(3)> for 57details of the B<EVP_CIPHER> structure. 58 59=head1 SEE ALSO 60 --- 15 unchanged lines hidden --- |