Imports of package signed

PathSynopsis
cryptoPackage crypto collects common cryptographic constants.
crypto/ecdsaPackage ecdsa implements the Elliptic Curve Digital Signature Algorithm, as defined in [FIPS 186-5].
crypto/randPackage rand implements a cryptographically secure random number generator.
crypto/rsaPackage rsa implements RSA encryption as specified in PKCS #1 and RFC 8017.
crypto/sha256Package sha256 implements the SHA224 and SHA256 hash algorithms as defined in FIPS 180-4.
crypto/x509Package x509 implements a subset of the X.509 standard.
encoding/pemPackage pem implements the PEM data encoding, which originated in Privacy Enhanced Mail.
errorsPackage errors implements functions to manipulate errors.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/Sirupsen/logrus
github.com/agl/ed25519
github.com/docker/go/canonical/jsonPackage json implements encoding and decoding of JSON objects as defined in RFC 4627.
github.com/docker/notary/trustmanager
github.com/docker/notary/tuf/data
github.com/docker/notary/tuf/utils
math/bigPackage big implements arbitrary-precision arithmetic (big numbers).
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.
timePackage time provides functionality for measuring and displaying time.