Here are the classes, structs, unions and interfaces with brief descriptions:

NBotan
NCert_Extension
CAlternative_Name
CAuthority_Key_ID
CBasic_Constraints
CCertificate_Policies
CCRL_Number
CCRL_ReasonCode
CExtended_Key_Usage
CIssuer_Alternative_Name
CKey_Usage
CSubject_Alternative_Name
CSubject_Key_ID
NPK_Ops
CDecryption
CEncryption
CKey_Agreement
CSignature
CVerification
CAdler32
CAES_128
CAES_128_NI
CAES_128_SSSE3
CAES_192
CAES_192_NI
CAES_192_SSSE3
CAES_256
CAES_256_NI
CAES_256_SSSE3
CAES_ISA_Engine
CAlert
CAlgorithm
CAlgorithm_Cache
CAlgorithm_Factory
CEngine_Iterator
CAlgorithm_Not_Found
CAlgorithmIdentifier
CAllocator
CAlternativeName
CANSI_X919_MAC
CANSI_X923_Padding
CANSI_X931_RNG
CARC4
CASN1_Car
CASN1_Ced
CASN1_Cex
CASN1_Chr
CASN1_EAC_String
CASN1_Object
CASN1_String
CAssembler_Engine
CAttribute
CAutoSeeded_RNG
CBase64_Decoder
CBase64_Encoder
CBeOS_EntropySource
CBER_Bad_Tag
CBER_Decoder
CBER_Decoding_Error
CBER_Object
CBigInt
CDivideByZero
CBitBucket
CBlinder
CBlock_Cipher_Fixed_Params
CBlockCipher
CBlockCipherModePaddingMethod
CBlowfish
CBMW_512
CBuffered_Computation
CBuffered_Filter
CBzip_Compression
CBzip_Decompression
Ccalendar_point
CCamellia_128
CCamellia_192
CCamellia_256
CCascade_Cipher
CCAST_128
CCAST_256
CCBC_Decryption
CCBC_Encryption
CCBC_MAC
CCertificate
CCertificate_Extension
CCertificate_Req
CCertificate_Store
CCertificate_Store_Memory
CCertificate_Verify
CCFB_Decryption
CCFB_Encryption
CChain
CCipherSuite
CClient_Hello
CClient_Key_Exchange
CCMAC
CCMS_Decoder
CCMS_Encoder
CComb4P
CCore_Engine
CCPUID
CCRC24
CCRC32
CCRL_Entry
CCTR_BE
CCTS_Decryption
CCTS_Encryption
CCurveGFp
CData_Store
CMatcher
CDataSink
CDataSink_Stream
CDataSource
CDataSource_Command
CDataSource_Memory
CDataSource_Stream
CDecoding_Error
Cdel_fun
CDER_Encoder
CDES
CDESX
CDevice_EntropySource
CDH_KA_Operation
CDH_PrivateKey
CDH_PublicKey
CDL_Group
CDL_Scheme_PrivateKey
CDL_Scheme_PublicKey
CDLIES_Decryptor
CDLIES_Encryptor
CDSA_PrivateKey
CDSA_PublicKey
CDSA_Signature_Operation
CDSA_Verification_Operation
CDynamically_Loaded_Engine
CDynamically_Loaded_Library
CEAC1_1_ADO
CEAC1_1_CVC
CEAC1_1_CVC_Options
CEAC1_1_gen_CVC
CEAC1_1_obj
CEAC1_1_Req
CEAC_Signed_Object
CEAC_Time
CEAX_Base
CEAX_Decryption
CEAX_Encryption
CEC_Group
CEC_PrivateKey
CEC_PublicKey
CECB_Decryption
CECB_Encryption
CECDH_KA_Operation
CECDH_PrivateKey
CECDH_PublicKey
CECDSA_PrivateKey
CECDSA_PublicKey
CECDSA_Signature
CECDSA_Signature_Operation
CECDSA_Verification_Operation
CEGD_EntropySource
CElGamal_Decryption_Operation
CElGamal_Encryption_Operation
CElGamal_PrivateKey
CElGamal_PublicKey
CEME
CEME1
CEME_PKCS1v15
CEMSA
CEMSA1
CEMSA1_BSI
CEMSA2
CEMSA3
CEMSA3_Raw
CEMSA4
CEMSA_Raw
CEncoding_Error
CEngine
CEntropy_Accumulator
CEntropy_Accumulator_BufferedComputation
CEntropySource
CExtensions
CFanout_Filter
CFilter
CFinished
CFixed_Base_Power_Mod
CFixed_Exponent_Power_Mod
CFixed_Window_Exponentiator
CFork
CFTW_EntropySource
CGMP_Engine
CGMP_MPZ
CGOST_28147_89
CGOST_28147_89_Params
CGOST_34_11
CHandshake_State
CHandshakeHash
CHandshakeMessage
CHAS_160
CHash_Filter
CHashFunction
CHello_Request
CHex_Decoder
CHex_Encoder
CHigh_Resolution_Timestamp
CHMAC
CHMAC_RNG
CIDEA
CIDEA_SSE2
CIF_Scheme_PrivateKey
CIF_Scheme_PublicKey
CIllegal_Point
CIllegal_Transformation
CInteger_Overflow_Detected
CIntegrity_Failure
CIntel_Rdrand
CInternal_Error
CInvalid_Algorithm_Name
CInvalid_Block_Size
CInvalid_IV_Length
CInvalid_Key_Length
CInvalid_OID
CInvalid_State
CKASUMI
CKDF
CKDF1
CKDF2
CKeccak_1600
CKey_Length_Specification
CKeyed_Filter
CLibrary_State
CLibraryInitializer
CLion
CLocking_Allocator
CLookup_Error
CLubyRackoff
CMAC_Filter
CMalloc_Allocator
CMARS
CMD2
CMD4
CMD4_X86_32
CMD5
CMD5_X86_32
CMDx_HashFunction
CMemory_Exhaustion
CMemoryMapping_Allocator
CMemoryRegion
CMemoryVector
CMessageAuthenticationCode
CMGF
CMGF1
CMISTY1
CModular_Exponentiator
CModular_Reducer
CMontgomery_Exponentiator
CMutex
CMutex_Factory
CMutex_Holder
CNoekeon
CNoekeon_SIMD
CNoop_Mutex_Factory
CNR_PrivateKey
CNR_PublicKey
CNR_Signature_Operation
CNR_Verification_Operation
CNull_Padding
CNull_RNG
COctetString
COFB
COID
COneAndZeros_Padding
COpenPGP_S2K
COpenSSL_Engine
COSSL_BN
COSSL_BN_CTX
COutput_Buffers
CParallel
CPBE
CPBE_PKCS5v15
CPBE_PKCS5v20
CPBKDF
CPipe
CInvalid_Message_Number
CPK_Decryptor
CPK_Decryptor_EME
CPK_Decryptor_Filter
CPK_Encryptor
CPK_Encryptor_EME
CPK_Encryptor_Filter
CPK_Key_Agreement
CPK_Key_Agreement_Key
CPK_Signer
CPK_Signer_Filter
CPK_Verifier
CPK_Verifier_Filter
CPKCS10_Request
CPKCS5_PBKDF1
CPKCS5_PBKDF2
CPKCS7_Padding
CPKCS8_Exception
CPointGFp
CPolicy_Violation
CPooling_Allocator
CPower_Mod
CPrivate_Key
CPRNG_Unseeded
CPthread_Mutex_Factory
CPublic_Key
CRandomNumberGenerator
CRandpool
CRC2
CRecord_Reader
CRecord_Writer
CRIPEMD_128
CRIPEMD_160
CRSA_Private_Operation
CRSA_PrivateKey
CRSA_Public_Operation
CRSA_PublicKey
CRTSS_Share
CRW_PrivateKey
CRW_PublicKey
CRW_Signature_Operation
CRW_Verification_Operation
CSAFER_SK
CSalsa20
CSCAN_Name
CSecureQueue
CSecureVector
CSEED
CSelf_Test_Failure
CSerpent
CSerpent_SIMD
CSerpent_X86_32
CServer_Hello
CServer_Hello_Done
CServer_Key_Exchange
CSessionKeys
CSHA_160
CSHA_160_SSE2
CSHA_160_X86_32
CSHA_160_X86_64
CSHA_224
CSHA_256
CSHA_384
CSHA_512
CSIMD_Engine
CSIMD_Scalar
CSkein_512
CSkipjack
CSquare
CSRP6_Server_Session
CSSL3_MAC
CSSL3_PRF
CStream_IO_Error
CStreamCipher
CStreamCipher_Filter
CSymmetricAlgorithm
CTEA
CTiger
CTLS_12_PRF
CTLS_Client
CTLS_Connection
CTLS_Data_Reader
CTLS_Exception
CTLS_Policy
CTLS_PRF
CTLS_Server
CTripleDES
CTuring
CTwofish
CUnexpected_Message
CUnix_EntropySource
CUnix_Program
CUser_Interface
CWhirlpool
CWiderWake_41_BE
CWin32_CAPI_EntropySource
CWin32_EntropySource
CWin32_Mutex_Factory
CX509_CA
CX509_Cert_Options
CX509_Certificate
CX509_CRL
CX509_CRL_Error
CX509_DN
CX509_Object
CX509_Store
CX509_Time
CX942_PRF
CXTEA
CXTEA_SIMD
CXTS_Decryption
CXTS_Encryption
CZlib_Compression
CZlib_Decompression