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GSS-API Per-message Routines
Routine Function
------- --------
gss_get_mic Calculate a cryptographic message
integrity code (MIC) for a
message; integrity service.
gss_verify_mic Check a MIC against a message;
verify integrity of a received
message.
gss_wrap Attach a MIC to a message, and
optionally encrypt the message
content.
confidentiality service
gss_unwrap Verify a message with attached
MIC, and decrypt message content
if necessary.
minor_status: (Integer, modify) Mechanism specific status code.
context_handle: (gss_ctx_id_t, read) Identifies the context on which the message will be sent.
qop_req: (gss_qop_t, read, optional) Specifies requested quality of protection. Callers are encouraged, on portability grounds, to accept the default quality of protection offered by the chosen mechanism, which may be requested by specifying GSS_C_QOP_DEFAULT for this parameter. If an unsupported protection strength is requested, gss_get_mic will return a major_status of GSS_S_BAD_QOP.
message_buffer: (buffer, opaque, read) Message to be protected.
message_token: (buffer, opaque, modify) Buffer to receive token. The application must free storage associated with this buffer after use with a call to gss_release_buffer().
Generates a cryptographic MIC for the supplied message, and places the MIC in a token for transfer to the peer application. The qop_req parameter allows a choice between several cryptographic algorithms, if supported by the chosen mechanism.
Since some application-level protocols may wish to use tokens emitted by gss_wrap() to provide "secure framing", implementations must support derivation of MICs from zero-length messages.
Return value:
GSS_S_COMPLETE: Successful completion.
GSS_S_CONTEXT_EXPIRED: The context has already expired.
GSS_S_NO_CONTEXT: The context_handle parameter did not identify a
valid context.
GSS_S_BAD_QOP: The specified QOP is not supported by the
mechanism.
minor_status: (Integer, modify) Mechanism specific status code.
context_handle: (gss_ctx_id_t, read) Identifies the context on which the message arrived.
message_buffer: (buffer, opaque, read) Message to be verified.
token_buffer: (buffer, opaque, read) Token associated with message.
qop_state: (gss_qop_t, modify, optional) Quality of protection gained from MIC Specify NULL if not required.
Verifies that a cryptographic MIC, contained in the token parameter, fits the supplied message. The qop_state parameter allows a message recipient to determine the strength of protection that was applied to the message.
Since some application-level protocols may wish to use tokens emitted by gss_wrap() to provide "secure framing", implementations must support the calculation and verification of MICs over zero-length messages.
Return value:
GSS_S_COMPLETE: Successful completion.
GSS_S_DEFECTIVE_TOKEN: The token failed consistency checks.
GSS_S_BAD_SIG: The MIC was incorrect.
GSS_S_DUPLICATE_TOKEN: The token was valid, and contained a
correct MIC for the message, but it had already been processed.
GSS_S_OLD_TOKEN: The token was valid, and contained a correct MIC
for the message, but it is too old to check for duplication.
GSS_S_UNSEQ_TOKEN: The token was valid, and contained a correct
MIC for the message, but has been verified out of sequence; a later
token has already been received.
GSS_S_GAP_TOKEN: The token was valid, and contained a correct MIC
for the message, but has been verified out of sequence; an earlier
expected token has not yet been received.
GSS_S_CONTEXT_EXPIRED: The context has already expired.
GSS_S_NO_CONTEXT: The context_handle parameter did not identify a
valid context.
minor_status: (Integer, modify) Mechanism specific status code.
context_handle: (gss_ctx_id_t, read) Identifies the context on which the message will be sent.
conf_req_flag: (boolean, read) Non-zero - Both confidentiality and integrity services are requested. Zero - Only integrity service is requested.
qop_req: (gss_qop_t, read, optional) Specifies required quality of protection. A mechanism-specific default may be requested by setting qop_req to GSS_C_QOP_DEFAULT. If an unsupported protection strength is requested, gss_wrap will return a major_status of GSS_S_BAD_QOP.
input_message_buffer: (buffer, opaque, read) Message to be protected.
conf_state: (boolean, modify, optional) Non-zero - Confidentiality, data origin authentication and integrity services have been applied. Zero - Integrity and data origin services only has been applied. Specify NULL if not required.
output_message_buffer: (buffer, opaque, modify) Buffer to receive protected message. Storage associated with this message must be freed by the application after use with a call to gss_release_buffer().
Attaches a cryptographic MIC and optionally encrypts the specified input_message. The output_message contains both the MIC and the message. The qop_req parameter allows a choice between several cryptographic algorithms, if supported by the chosen mechanism.
Since some application-level protocols may wish to use tokens emitted by gss_wrap() to provide "secure framing", implementations must support the wrapping of zero-length messages.
Return value:
GSS_S_COMPLETE: Successful completion.
GSS_S_CONTEXT_EXPIRED: The context has already expired.
GSS_S_NO_CONTEXT: The context_handle parameter did not identify a
valid context.
GSS_S_BAD_QOP: The specified QOP is not supported by the
mechanism.
minor_status: (Integer, modify) Mechanism specific status code.
context_handle: (gss_ctx_id_t, read) Identifies the context on which the message arrived.
input_message_buffer: (buffer, opaque, read) Protected message.
output_message_buffer: (buffer, opaque, modify) Buffer to receive unwrapped message. Storage associated with this buffer must be freed by the application after use use with a call to gss_release_buffer().
conf_state: (boolean, modify, optional) Non-zero - Confidentiality and integrity protection were used. Zero - Integrity service only was used. Specify NULL if not required.
qop_state: (gss_qop_t, modify, optional) Quality of protection provided. Specify NULL if not required.
Converts a message previously protected by gss_wrap back to a usable form, verifying the embedded MIC. The conf_state parameter indicates whether the message was encrypted; the qop_state parameter indicates the strength of protection that was used to provide the confidentiality and integrity services.
Since some application-level protocols may wish to use tokens emitted by gss_wrap() to provide "secure framing", implementations must support the wrapping and unwrapping of zero-length messages.
Return value:
GSS_S_COMPLETE: Successful completion.
GSS_S_DEFECTIVE_TOKEN: The token failed consistency checks.
GSS_S_BAD_SIG: The MIC was incorrect.
GSS_S_DUPLICATE_TOKEN: The token was valid, and contained a
correct MIC for the message, but it had already been processed.
GSS_S_OLD_TOKEN: The token was valid, and contained a correct MIC
for the message, but it is too old to check for duplication.
GSS_S_UNSEQ_TOKEN: The token was valid, and contained a correct
MIC for the message, but has been verified out of sequence; a later
token has already been received.
GSS_S_GAP_TOKEN: The token was valid, and contained a correct MIC
for the message, but has been verified out of sequence; an earlier
expected token has not yet been received.
GSS_S_CONTEXT_EXPIRED: The context has already expired.
GSS_S_NO_CONTEXT: The context_handle parameter did not identify a
valid context.
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