diff options
Diffstat (limited to 'crypto/src/crypto/engines/Cast6Engine.cs')
| -rw-r--r-- | crypto/src/crypto/engines/Cast6Engine.cs | 70 |
1 files changed, 41 insertions, 29 deletions
diff --git a/crypto/src/crypto/engines/Cast6Engine.cs b/crypto/src/crypto/engines/Cast6Engine.cs index c5c419b78..c3f379fcf 100644 --- a/crypto/src/crypto/engines/Cast6Engine.cs +++ b/crypto/src/crypto/engines/Cast6Engine.cs @@ -134,20 +134,44 @@ namespace Org.BouncyCastle.Crypto.Engines } } - /** - * Encrypt the given input starting at the given offset and place - * the result in the provided buffer starting at the given offset. - * - * @param src The plaintext buffer - * @param srcIndex An offset into src - * @param dst The ciphertext buffer - * @param dstIndex An offset into dst - */ - internal override int EncryptBlock( - byte[] src, - int srcIndex, - byte[] dst, - int dstIndex) +#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER + internal override int EncryptBlock(ReadOnlySpan<byte> input, Span<byte> output) + { + // process the input block + // batch the units up into 4x32 bit chunks and go for it + uint A = Pack.BE_To_UInt32(input); + uint B = Pack.BE_To_UInt32(input[4..]); + uint C = Pack.BE_To_UInt32(input[8..]); + uint D = Pack.BE_To_UInt32(input[12..]); + uint[] result = new uint[4]; + CAST_Encipher(A, B, C, D, result); + // now stuff them into the destination block + Pack.UInt32_To_BE(result[0], output); + Pack.UInt32_To_BE(result[1], output[4..]); + Pack.UInt32_To_BE(result[2], output[8..]); + Pack.UInt32_To_BE(result[3], output[12..]); + return BLOCK_SIZE; + } + + internal override int DecryptBlock(ReadOnlySpan<byte> input, Span<byte> output) + { + // process the input block + // batch the units up into 4x32 bit chunks and go for it + uint A = Pack.BE_To_UInt32(input); + uint B = Pack.BE_To_UInt32(input[4..]); + uint C = Pack.BE_To_UInt32(input[8..]); + uint D = Pack.BE_To_UInt32(input[12..]); + uint[] result = new uint[4]; + CAST_Decipher(A, B, C, D, result); + // now stuff them into the destination block + Pack.UInt32_To_BE(result[0], output); + Pack.UInt32_To_BE(result[1], output[4..]); + Pack.UInt32_To_BE(result[2], output[8..]); + Pack.UInt32_To_BE(result[3], output[12..]); + return BLOCK_SIZE; + } +#else + internal override int EncryptBlock(byte[] src, int srcIndex, byte[] dst, int dstIndex) { // process the input block // batch the units up into 4x32 bit chunks and go for it @@ -165,20 +189,7 @@ namespace Org.BouncyCastle.Crypto.Engines return BLOCK_SIZE; } - /** - * Decrypt the given input starting at the given offset and place - * the result in the provided buffer starting at the given offset. - * - * @param src The plaintext buffer - * @param srcIndex An offset into src - * @param dst The ciphertext buffer - * @param dstIndex An offset into dst - */ - internal override int DecryptBlock( - byte[] src, - int srcIndex, - byte[] dst, - int dstIndex) + internal override int DecryptBlock(byte[] src, int srcIndex, byte[] dst, int dstIndex) { // process the input block // batch the units up into 4x32 bit chunks and go for it @@ -195,8 +206,9 @@ namespace Org.BouncyCastle.Crypto.Engines Pack.UInt32_To_BE(result[3], dst, dstIndex + 12); return BLOCK_SIZE; } +#endif - /** + /** * Does the 12 quad rounds rounds to encrypt the block. * * @param A the 00-31 bits of the plaintext block |