I'm trying to export the private key part of a a Keychain identity. I
invariably get status -25260,
"Passphrase is required for import/export." That happens in the below whether
or not I give kSecKeySecurePassphrase to have the user asked for the password
or supply it myself.
CFDataRef exportedData;
SecKeyImportExportParameters params;
params.version = SEC_KEY_IMPORT_EXPORT_PARAMS_VERSION;
params.flags = kSecKeyNoAccessControl;
params.passphrase = (CFStringRef)(@"secsec");
params.alertTitle = NULL;
params.alertPrompt = NULL;
status = SecKeychainItemExport(key,
kSecFormatUnknown,
0,
¶ms,
&exportedData);
I do actually have a key, which I confirm with this code:
CSSM_KEY_PTR cssmKey;
status = SecKeyGetCSSMKey(key, (const CSSM_KEY **)(&cssmKey));
NSLog(@"get CSSM key %d\n", status);
NSLog(@"blobtype = %d", cssmKey->KeyHeader.BlobType);
NSLog(@"blob format = %d", cssmKey->KeyHeader.Format);
NSLog(@"blob attr = %x", cssmKey->KeyHeader.KeyAttr);
NSLog(@"blob usage = %x", cssmKey->KeyHeader.KeyUsage);
The BlobType is:
CSSM_KEYBLOB_REFERENCE = 2, /* The blob is a reference
to a key */
Format:
CSSM_KEYBLOB_RAW_FORMAT_NONE = 0,
/* No further conversion need to be done */
Attributes:
CSSM_KEYATTR_PERMANENT = 0x00000001,
CSSM_KEYATTR_SENSITIVE = 0x00000008,
CSSM_KEYATTR_EXTRACTABLE = 0x00000020,
/* Valid only in a key header generated by a CSP, not valid during an
API call */
CSSM_KEYATTR_ALWAYS_SENSITIVE = 0x00000010,
Usage:
CSSM_KEYUSE_ANY = 0x80000000,
CSSM_KEYUSE_ENCRYPT = 0x00000001,
CSSM_KEYUSE_DECRYPT = 0x00000002,
CSSM_KEYUSE_SIGN = 0x00000004,
CSSM_KEYUSE_VERIFY = 0x00000008,
CSSM_KEYUSE_SIGN_RECOVER = 0x00000010,
CSSM_KEYUSE_VERIFY_RECOVER = 0x00000020,
CSSM_KEYUSE_WRAP = 0x00000040,
CSSM_KEYUSE_UNWRAP = 0x00000080,
CSSM_KEYUSE_DERIVE = 0x00000100
Any ideas?
-----
Brian Marick, independent consultant
Mostly on agile methods with a testing slant
Author of /Programming Cocoa with Ruby/
www.exampler.com, www.exampler.com/blog, www.twitter.com/marick
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