DLI Implementation and Reference Guide - Datalogics

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A.140 DLI Implementation and Reference Guide dlpdfsignaturesetdatacallback (DLPDFSIGNATURE *signature, void (*dataCallback)(char *, int)) Return Value: void Description Parameters Return Value This is an optional call for clients using PKCS #7 certificates. A callback function is supplied for the signature. • DLPDFSIGNATURE *signature: signature with which PKCS #7 certificate will be associated • void (*dataCallback)(char *, int): callback function, called during the dlpdfdocwritepdf function call; see Technical Notes below. void Exceptions Header Related Methods Availability dli.h dlpdfsignaturesetpkcs7cert dlpdfdocwritepdf All DLI-supported platforms. Technical Notes 1 The callback is called during the dlpdfdocwritepdf function with binary information from the PDF file. This information will be in sequential pieces, and may be used to generate the PDF document hash value. The information is supplied as binary values in the character buffer; the length to read is supplied as the second parameter. 2 A length of 0 (zero) passed in the callback function indicates that no further data is to be read, and the hash may be finalized.
DLI Reference Guide A.141 dlpdfsignaturesetpkcs7cert (DLPDFSIGNATURE *signature, int maxLen, int (*genPKCS7Cert)(char *)) Return Value: void Description Parameters Return Value This function sets the certificate generation callback for DLPDF- SIGNATUREs of type dlpdfsigacropkcs7 and dlpdfsigverisign. • DLPDFSIGNATURE *signature: signature with which certificate will be associated • int maxlen: number of bytes provided to the genPKCS7Cert callback • int (*genPKCS7Cert)(char *): callback function, called during the dlpdfdocwritepdf function call; see Technical Notes below. void Exceptions Header Related Methods Availability dli.h dlpdfdocwritepdf dlpdfsignaturesetdatacallback dlpdfsignaturesetx509cert All DLI-supported platforms. Technical Notes 1 For these signature types, dlpdfsigacropkcs7 and dlpdfsigverisign, the application using DLI is required to generated a fully-formed PKCS #7 certificate with an MD5 checksum of the PDF document, encrypted with the private key corresponding to the public key in the certificate. The RSA public-key algorithm with a 1024-bit key length is used. 2 The genPKCS7Cert callback is called by DLI during the dlpdfdocwritepdf function call. The callback is supplied a binary data buffer of length maxLen. The first 16 bytes of this buffer contain the MD5 checksum (in binary) for the PDF document to sign. The callback must generate a PKCS #7 certificate as described above, and fill the data buffer with the certificate, in binary. The callback function must return the length to read from the data buffer, in bytes. NOTE: maxLen bytes are set aside in the output PDF file for the PKCS #7 certificate, and will be written to the PDF file regardless of the actual certificate length. Callers should pass length values which are close to the certificate length, if possible.
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DLI Implementation and Reference Guide - Datalogics

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