RSA Security 5 AI_SignVerify, is formatX931, , If , must be given a pointer to a structure of type A_X931_PARAMS:, Set the arguments for A_X931_PARAMS as follows:, a pointer to a B_SIGN_VERIFY_PARAMS structure (see above).

Chapter 2 Algorithm Info Types 237
AI_SignVerify
If formatMethodName is “formatX931”, formatParams must be given a pointer to a
structure of type A_X931_PARAMS:
Set the arguments for A_X931_PARAMS as follows:
Format of info returned by B_GetAlgorithmInfo:
a pointer to a B_SIGN_VERIFY_PARAMS structure (see above).
formatMethodName formatX931 Signature is output as the binary
concatenation of r with s.
formatX931PKCS Signature is output in PKCS #1 style DER
encoding.
formatX931X957 Signature is output in X9.57 (DSA) DER
format.
formatParams
Pointer to
structure of
type A_X931_PARAMS
Use with rsaSignX931 and rsaVerifyX931.
typedef struct {
unsigned int blockLen;
unsigned int oidNum;
ITEM OID;
} A_X931_PARAMS;
Argument Values Comments
blockLen Number of bytes in
final X.931
signature
This is the number of bytes that the binary
concatenation of r with s requires.
oidNum The object
identifier for the
SHA1 hash
algorithm
Currently always equals 3 (SHA) for X9.31.
OID Object identifier
to use for BER
encoding
Currently only used when
“formatX931PKCS” is specified in the
formatMethodName
.
PKCS #1 style BER/DER encoding is used.
Argument Values Comments